1 /* 2 * All test cases of nested virtualization should be in this file 3 * 4 * Author : Arthur Chunqi Li <yzt356@gmail.com> 5 */ 6 7 #include <asm/debugreg.h> 8 9 #include "vmx.h" 10 #include "msr.h" 11 #include "processor.h" 12 #include "vm.h" 13 #include "pci.h" 14 #include "fwcfg.h" 15 #include "isr.h" 16 #include "desc.h" 17 #include "apic.h" 18 #include "types.h" 19 #include "vmalloc.h" 20 #include "alloc_page.h" 21 #include "smp.h" 22 #include "delay.h" 23 24 #define NONCANONICAL 0xaaaaaaaaaaaaaaaaull 25 26 #define VPID_CAP_INVVPID_TYPES_SHIFT 40 27 28 u64 ia32_pat; 29 u64 ia32_efer; 30 void *io_bitmap_a, *io_bitmap_b; 31 u16 ioport; 32 33 unsigned long *pml4; 34 u64 eptp; 35 void *data_page1, *data_page2; 36 37 phys_addr_t pci_physaddr; 38 39 void *pml_log; 40 #define PML_INDEX 512 41 42 static inline unsigned ffs(unsigned x) 43 { 44 int pos = -1; 45 46 __asm__ __volatile__("bsf %1, %%eax; cmovnz %%eax, %0" 47 : "+r"(pos) : "rm"(x) : "eax"); 48 return pos + 1; 49 } 50 51 static inline void vmcall(void) 52 { 53 asm volatile("vmcall"); 54 } 55 56 static void basic_guest_main(void) 57 { 58 report(1, "Basic VMX test"); 59 } 60 61 static int basic_exit_handler(union exit_reason exit_reason) 62 { 63 report(0, "Basic VMX test"); 64 print_vmexit_info(exit_reason); 65 return VMX_TEST_EXIT; 66 } 67 68 static void vmenter_main(void) 69 { 70 u64 rax; 71 u64 rsp, resume_rsp; 72 73 report(1, "test vmlaunch"); 74 75 asm volatile( 76 "mov %%rsp, %0\n\t" 77 "mov %3, %%rax\n\t" 78 "vmcall\n\t" 79 "mov %%rax, %1\n\t" 80 "mov %%rsp, %2\n\t" 81 : "=r"(rsp), "=r"(rax), "=r"(resume_rsp) 82 : "g"(0xABCD)); 83 report((rax == 0xFFFF) && (rsp == resume_rsp), "test vmresume"); 84 } 85 86 static int vmenter_exit_handler(union exit_reason exit_reason) 87 { 88 u64 guest_rip = vmcs_read(GUEST_RIP); 89 90 switch (exit_reason.basic) { 91 case VMX_VMCALL: 92 if (regs.rax != 0xABCD) { 93 report(0, "test vmresume"); 94 return VMX_TEST_VMEXIT; 95 } 96 regs.rax = 0xFFFF; 97 vmcs_write(GUEST_RIP, guest_rip + 3); 98 return VMX_TEST_RESUME; 99 default: 100 report(0, "test vmresume"); 101 print_vmexit_info(exit_reason); 102 } 103 return VMX_TEST_VMEXIT; 104 } 105 106 u32 preempt_scale; 107 volatile unsigned long long tsc_val; 108 volatile u32 preempt_val; 109 u64 saved_rip; 110 111 static int preemption_timer_init(struct vmcs *vmcs) 112 { 113 if (!(ctrl_pin_rev.clr & PIN_PREEMPT)) { 114 printf("\tPreemption timer is not supported\n"); 115 return VMX_TEST_EXIT; 116 } 117 vmcs_write(PIN_CONTROLS, vmcs_read(PIN_CONTROLS) | PIN_PREEMPT); 118 preempt_val = 10000000; 119 vmcs_write(PREEMPT_TIMER_VALUE, preempt_val); 120 preempt_scale = rdmsr(MSR_IA32_VMX_MISC) & 0x1F; 121 122 if (!(ctrl_exit_rev.clr & EXI_SAVE_PREEMPT)) 123 printf("\tSave preemption value is not supported\n"); 124 125 return VMX_TEST_START; 126 } 127 128 static void preemption_timer_main(void) 129 { 130 tsc_val = rdtsc(); 131 if (ctrl_exit_rev.clr & EXI_SAVE_PREEMPT) { 132 vmx_set_test_stage(0); 133 vmcall(); 134 if (vmx_get_test_stage() == 1) 135 vmcall(); 136 } 137 vmx_set_test_stage(1); 138 while (vmx_get_test_stage() == 1) { 139 if (((rdtsc() - tsc_val) >> preempt_scale) 140 > 10 * preempt_val) { 141 vmx_set_test_stage(2); 142 vmcall(); 143 } 144 } 145 tsc_val = rdtsc(); 146 asm volatile ("hlt"); 147 vmcall(); 148 vmx_set_test_stage(5); 149 vmcall(); 150 } 151 152 static int preemption_timer_exit_handler(union exit_reason exit_reason) 153 { 154 bool guest_halted; 155 u64 guest_rip; 156 u32 insn_len; 157 u32 ctrl_exit; 158 159 guest_rip = vmcs_read(GUEST_RIP); 160 insn_len = vmcs_read(EXI_INST_LEN); 161 switch (exit_reason.basic) { 162 case VMX_PREEMPT: 163 switch (vmx_get_test_stage()) { 164 case 1: 165 case 2: 166 report(((rdtsc() - tsc_val) >> preempt_scale) >= preempt_val, 167 "busy-wait for preemption timer"); 168 vmx_set_test_stage(3); 169 vmcs_write(PREEMPT_TIMER_VALUE, preempt_val); 170 return VMX_TEST_RESUME; 171 case 3: 172 guest_halted = 173 (vmcs_read(GUEST_ACTV_STATE) == ACTV_HLT); 174 report(((rdtsc() - tsc_val) >> preempt_scale) >= preempt_val 175 && guest_halted, 176 "preemption timer during hlt"); 177 vmx_set_test_stage(4); 178 vmcs_write(PIN_CONTROLS, 179 vmcs_read(PIN_CONTROLS) & ~PIN_PREEMPT); 180 vmcs_write(EXI_CONTROLS, 181 vmcs_read(EXI_CONTROLS) & ~EXI_SAVE_PREEMPT); 182 vmcs_write(GUEST_ACTV_STATE, ACTV_ACTIVE); 183 return VMX_TEST_RESUME; 184 case 4: 185 report(saved_rip == guest_rip, 186 "preemption timer with 0 value"); 187 break; 188 default: 189 report(false, "Invalid stage."); 190 print_vmexit_info(exit_reason); 191 break; 192 } 193 break; 194 case VMX_VMCALL: 195 vmcs_write(GUEST_RIP, guest_rip + insn_len); 196 switch (vmx_get_test_stage()) { 197 case 0: 198 report(vmcs_read(PREEMPT_TIMER_VALUE) == preempt_val, 199 "Keep preemption value"); 200 vmx_set_test_stage(1); 201 vmcs_write(PREEMPT_TIMER_VALUE, preempt_val); 202 ctrl_exit = (vmcs_read(EXI_CONTROLS) | 203 EXI_SAVE_PREEMPT) & ctrl_exit_rev.clr; 204 vmcs_write(EXI_CONTROLS, ctrl_exit); 205 return VMX_TEST_RESUME; 206 case 1: 207 report(vmcs_read(PREEMPT_TIMER_VALUE) < preempt_val, 208 "Save preemption value"); 209 return VMX_TEST_RESUME; 210 case 2: 211 report(0, "busy-wait for preemption timer"); 212 vmx_set_test_stage(3); 213 vmcs_write(PREEMPT_TIMER_VALUE, preempt_val); 214 return VMX_TEST_RESUME; 215 case 3: 216 report(0, "preemption timer during hlt"); 217 vmx_set_test_stage(4); 218 /* fall through */ 219 case 4: 220 vmcs_write(PIN_CONTROLS, 221 vmcs_read(PIN_CONTROLS) | PIN_PREEMPT); 222 vmcs_write(PREEMPT_TIMER_VALUE, 0); 223 saved_rip = guest_rip + insn_len; 224 return VMX_TEST_RESUME; 225 case 5: 226 report(0, 227 "preemption timer with 0 value (vmcall stage 5)"); 228 break; 229 default: 230 // Should not reach here 231 report(false, "unexpected stage, %d", 232 vmx_get_test_stage()); 233 print_vmexit_info(exit_reason); 234 return VMX_TEST_VMEXIT; 235 } 236 break; 237 default: 238 report(false, "Unknown exit reason, 0x%x", exit_reason.full); 239 print_vmexit_info(exit_reason); 240 } 241 vmcs_write(PIN_CONTROLS, vmcs_read(PIN_CONTROLS) & ~PIN_PREEMPT); 242 return VMX_TEST_VMEXIT; 243 } 244 245 static void msr_bmp_init(void) 246 { 247 void *msr_bitmap; 248 u32 ctrl_cpu0; 249 250 msr_bitmap = alloc_page(); 251 ctrl_cpu0 = vmcs_read(CPU_EXEC_CTRL0); 252 ctrl_cpu0 |= CPU_MSR_BITMAP; 253 vmcs_write(CPU_EXEC_CTRL0, ctrl_cpu0); 254 vmcs_write(MSR_BITMAP, (u64)msr_bitmap); 255 } 256 257 static void *get_msr_bitmap(void) 258 { 259 void *msr_bitmap; 260 261 if (vmcs_read(CPU_EXEC_CTRL0) & CPU_MSR_BITMAP) { 262 msr_bitmap = (void *)vmcs_read(MSR_BITMAP); 263 } else { 264 msr_bitmap = alloc_page(); 265 memset(msr_bitmap, 0xff, PAGE_SIZE); 266 vmcs_write(MSR_BITMAP, (u64)msr_bitmap); 267 vmcs_set_bits(CPU_EXEC_CTRL0, CPU_MSR_BITMAP); 268 } 269 270 return msr_bitmap; 271 } 272 273 static void disable_intercept_for_x2apic_msrs(void) 274 { 275 unsigned long *msr_bitmap = (unsigned long *)get_msr_bitmap(); 276 u32 msr; 277 278 for (msr = APIC_BASE_MSR; 279 msr < (APIC_BASE_MSR+0xff); 280 msr += BITS_PER_LONG) { 281 unsigned int word = msr / BITS_PER_LONG; 282 283 msr_bitmap[word] = 0; 284 msr_bitmap[word + (0x800 / sizeof(long))] = 0; 285 } 286 } 287 288 static int test_ctrl_pat_init(struct vmcs *vmcs) 289 { 290 u64 ctrl_ent; 291 u64 ctrl_exi; 292 293 msr_bmp_init(); 294 if (!(ctrl_exit_rev.clr & EXI_SAVE_PAT) && 295 !(ctrl_exit_rev.clr & EXI_LOAD_PAT) && 296 !(ctrl_enter_rev.clr & ENT_LOAD_PAT)) { 297 printf("\tSave/load PAT is not supported\n"); 298 return 1; 299 } 300 301 ctrl_ent = vmcs_read(ENT_CONTROLS); 302 ctrl_exi = vmcs_read(EXI_CONTROLS); 303 ctrl_ent |= ctrl_enter_rev.clr & ENT_LOAD_PAT; 304 ctrl_exi |= ctrl_exit_rev.clr & (EXI_SAVE_PAT | EXI_LOAD_PAT); 305 vmcs_write(ENT_CONTROLS, ctrl_ent); 306 vmcs_write(EXI_CONTROLS, ctrl_exi); 307 ia32_pat = rdmsr(MSR_IA32_CR_PAT); 308 vmcs_write(GUEST_PAT, 0x0); 309 vmcs_write(HOST_PAT, ia32_pat); 310 return VMX_TEST_START; 311 } 312 313 static void test_ctrl_pat_main(void) 314 { 315 u64 guest_ia32_pat; 316 317 guest_ia32_pat = rdmsr(MSR_IA32_CR_PAT); 318 if (!(ctrl_enter_rev.clr & ENT_LOAD_PAT)) 319 printf("\tENT_LOAD_PAT is not supported.\n"); 320 else { 321 if (guest_ia32_pat != 0) { 322 report(0, "Entry load PAT"); 323 return; 324 } 325 } 326 wrmsr(MSR_IA32_CR_PAT, 0x6); 327 vmcall(); 328 guest_ia32_pat = rdmsr(MSR_IA32_CR_PAT); 329 if (ctrl_enter_rev.clr & ENT_LOAD_PAT) 330 report(guest_ia32_pat == ia32_pat, "Entry load PAT"); 331 } 332 333 static int test_ctrl_pat_exit_handler(union exit_reason exit_reason) 334 { 335 u64 guest_rip; 336 u64 guest_pat; 337 338 guest_rip = vmcs_read(GUEST_RIP); 339 switch (exit_reason.basic) { 340 case VMX_VMCALL: 341 guest_pat = vmcs_read(GUEST_PAT); 342 if (!(ctrl_exit_rev.clr & EXI_SAVE_PAT)) { 343 printf("\tEXI_SAVE_PAT is not supported\n"); 344 vmcs_write(GUEST_PAT, 0x6); 345 } else { 346 report(guest_pat == 0x6, "Exit save PAT"); 347 } 348 if (!(ctrl_exit_rev.clr & EXI_LOAD_PAT)) 349 printf("\tEXI_LOAD_PAT is not supported\n"); 350 else 351 report(rdmsr(MSR_IA32_CR_PAT) == ia32_pat, 352 "Exit load PAT"); 353 vmcs_write(GUEST_PAT, ia32_pat); 354 vmcs_write(GUEST_RIP, guest_rip + 3); 355 return VMX_TEST_RESUME; 356 default: 357 printf("ERROR : Unknown exit reason, 0x%x.\n", exit_reason.full); 358 break; 359 } 360 return VMX_TEST_VMEXIT; 361 } 362 363 static int test_ctrl_efer_init(struct vmcs *vmcs) 364 { 365 u64 ctrl_ent; 366 u64 ctrl_exi; 367 368 msr_bmp_init(); 369 ctrl_ent = vmcs_read(ENT_CONTROLS) | ENT_LOAD_EFER; 370 ctrl_exi = vmcs_read(EXI_CONTROLS) | EXI_SAVE_EFER | EXI_LOAD_EFER; 371 vmcs_write(ENT_CONTROLS, ctrl_ent & ctrl_enter_rev.clr); 372 vmcs_write(EXI_CONTROLS, ctrl_exi & ctrl_exit_rev.clr); 373 ia32_efer = rdmsr(MSR_EFER); 374 vmcs_write(GUEST_EFER, ia32_efer ^ EFER_NX); 375 vmcs_write(HOST_EFER, ia32_efer ^ EFER_NX); 376 return VMX_TEST_START; 377 } 378 379 static void test_ctrl_efer_main(void) 380 { 381 u64 guest_ia32_efer; 382 383 guest_ia32_efer = rdmsr(MSR_EFER); 384 if (!(ctrl_enter_rev.clr & ENT_LOAD_EFER)) 385 printf("\tENT_LOAD_EFER is not supported.\n"); 386 else { 387 if (guest_ia32_efer != (ia32_efer ^ EFER_NX)) { 388 report(0, "Entry load EFER"); 389 return; 390 } 391 } 392 wrmsr(MSR_EFER, ia32_efer); 393 vmcall(); 394 guest_ia32_efer = rdmsr(MSR_EFER); 395 if (ctrl_enter_rev.clr & ENT_LOAD_EFER) 396 report(guest_ia32_efer == ia32_efer, "Entry load EFER"); 397 } 398 399 static int test_ctrl_efer_exit_handler(union exit_reason exit_reason) 400 { 401 u64 guest_rip; 402 u64 guest_efer; 403 404 guest_rip = vmcs_read(GUEST_RIP); 405 switch (exit_reason.basic) { 406 case VMX_VMCALL: 407 guest_efer = vmcs_read(GUEST_EFER); 408 if (!(ctrl_exit_rev.clr & EXI_SAVE_EFER)) { 409 printf("\tEXI_SAVE_EFER is not supported\n"); 410 vmcs_write(GUEST_EFER, ia32_efer); 411 } else { 412 report(guest_efer == ia32_efer, "Exit save EFER"); 413 } 414 if (!(ctrl_exit_rev.clr & EXI_LOAD_EFER)) { 415 printf("\tEXI_LOAD_EFER is not supported\n"); 416 wrmsr(MSR_EFER, ia32_efer ^ EFER_NX); 417 } else { 418 report(rdmsr(MSR_EFER) == (ia32_efer ^ EFER_NX), 419 "Exit load EFER"); 420 } 421 vmcs_write(GUEST_PAT, ia32_efer); 422 vmcs_write(GUEST_RIP, guest_rip + 3); 423 return VMX_TEST_RESUME; 424 default: 425 printf("ERROR : Unknown exit reason, 0x%x.\n", exit_reason.full); 426 break; 427 } 428 return VMX_TEST_VMEXIT; 429 } 430 431 u32 guest_cr0, guest_cr4; 432 433 static void cr_shadowing_main(void) 434 { 435 u32 cr0, cr4, tmp; 436 437 // Test read through 438 vmx_set_test_stage(0); 439 guest_cr0 = read_cr0(); 440 if (vmx_get_test_stage() == 1) 441 report(0, "Read through CR0"); 442 else 443 vmcall(); 444 vmx_set_test_stage(1); 445 guest_cr4 = read_cr4(); 446 if (vmx_get_test_stage() == 2) 447 report(0, "Read through CR4"); 448 else 449 vmcall(); 450 // Test write through 451 guest_cr0 = guest_cr0 ^ (X86_CR0_TS | X86_CR0_MP); 452 guest_cr4 = guest_cr4 ^ (X86_CR4_TSD | X86_CR4_DE); 453 vmx_set_test_stage(2); 454 write_cr0(guest_cr0); 455 if (vmx_get_test_stage() == 3) 456 report(0, "Write throuth CR0"); 457 else 458 vmcall(); 459 vmx_set_test_stage(3); 460 write_cr4(guest_cr4); 461 if (vmx_get_test_stage() == 4) 462 report(0, "Write through CR4"); 463 else 464 vmcall(); 465 // Test read shadow 466 vmx_set_test_stage(4); 467 vmcall(); 468 cr0 = read_cr0(); 469 if (vmx_get_test_stage() != 5) 470 report(cr0 == guest_cr0, "Read shadowing CR0"); 471 vmx_set_test_stage(5); 472 cr4 = read_cr4(); 473 if (vmx_get_test_stage() != 6) 474 report(cr4 == guest_cr4, "Read shadowing CR4"); 475 // Test write shadow (same value with shadow) 476 vmx_set_test_stage(6); 477 write_cr0(guest_cr0); 478 if (vmx_get_test_stage() == 7) 479 report(0, "Write shadowing CR0 (same value with shadow)"); 480 else 481 vmcall(); 482 vmx_set_test_stage(7); 483 write_cr4(guest_cr4); 484 if (vmx_get_test_stage() == 8) 485 report(0, "Write shadowing CR4 (same value with shadow)"); 486 else 487 vmcall(); 488 // Test write shadow (different value) 489 vmx_set_test_stage(8); 490 tmp = guest_cr0 ^ X86_CR0_TS; 491 asm volatile("mov %0, %%rsi\n\t" 492 "mov %%rsi, %%cr0\n\t" 493 ::"m"(tmp) 494 :"rsi", "memory", "cc"); 495 report(vmx_get_test_stage() == 9, 496 "Write shadowing different X86_CR0_TS"); 497 vmx_set_test_stage(9); 498 tmp = guest_cr0 ^ X86_CR0_MP; 499 asm volatile("mov %0, %%rsi\n\t" 500 "mov %%rsi, %%cr0\n\t" 501 ::"m"(tmp) 502 :"rsi", "memory", "cc"); 503 report(vmx_get_test_stage() == 10, 504 "Write shadowing different X86_CR0_MP"); 505 vmx_set_test_stage(10); 506 tmp = guest_cr4 ^ X86_CR4_TSD; 507 asm volatile("mov %0, %%rsi\n\t" 508 "mov %%rsi, %%cr4\n\t" 509 ::"m"(tmp) 510 :"rsi", "memory", "cc"); 511 report(vmx_get_test_stage() == 11, 512 "Write shadowing different X86_CR4_TSD"); 513 vmx_set_test_stage(11); 514 tmp = guest_cr4 ^ X86_CR4_DE; 515 asm volatile("mov %0, %%rsi\n\t" 516 "mov %%rsi, %%cr4\n\t" 517 ::"m"(tmp) 518 :"rsi", "memory", "cc"); 519 report(vmx_get_test_stage() == 12, 520 "Write shadowing different X86_CR4_DE"); 521 } 522 523 static int cr_shadowing_exit_handler(union exit_reason exit_reason) 524 { 525 u64 guest_rip; 526 u32 insn_len; 527 u32 exit_qual; 528 529 guest_rip = vmcs_read(GUEST_RIP); 530 insn_len = vmcs_read(EXI_INST_LEN); 531 exit_qual = vmcs_read(EXI_QUALIFICATION); 532 switch (exit_reason.basic) { 533 case VMX_VMCALL: 534 switch (vmx_get_test_stage()) { 535 case 0: 536 report(guest_cr0 == vmcs_read(GUEST_CR0), 537 "Read through CR0"); 538 break; 539 case 1: 540 report(guest_cr4 == vmcs_read(GUEST_CR4), 541 "Read through CR4"); 542 break; 543 case 2: 544 report(guest_cr0 == vmcs_read(GUEST_CR0), 545 "Write through CR0"); 546 break; 547 case 3: 548 report(guest_cr4 == vmcs_read(GUEST_CR4), 549 "Write through CR4"); 550 break; 551 case 4: 552 guest_cr0 = vmcs_read(GUEST_CR0) ^ (X86_CR0_TS | X86_CR0_MP); 553 guest_cr4 = vmcs_read(GUEST_CR4) ^ (X86_CR4_TSD | X86_CR4_DE); 554 vmcs_write(CR0_MASK, X86_CR0_TS | X86_CR0_MP); 555 vmcs_write(CR0_READ_SHADOW, guest_cr0 & (X86_CR0_TS | X86_CR0_MP)); 556 vmcs_write(CR4_MASK, X86_CR4_TSD | X86_CR4_DE); 557 vmcs_write(CR4_READ_SHADOW, guest_cr4 & (X86_CR4_TSD | X86_CR4_DE)); 558 break; 559 case 6: 560 report(guest_cr0 == (vmcs_read(GUEST_CR0) ^ (X86_CR0_TS | X86_CR0_MP)), 561 "Write shadowing CR0 (same value)"); 562 break; 563 case 7: 564 report(guest_cr4 == (vmcs_read(GUEST_CR4) ^ (X86_CR4_TSD | X86_CR4_DE)), 565 "Write shadowing CR4 (same value)"); 566 break; 567 default: 568 // Should not reach here 569 report(false, "unexpected stage, %d", 570 vmx_get_test_stage()); 571 print_vmexit_info(exit_reason); 572 return VMX_TEST_VMEXIT; 573 } 574 vmcs_write(GUEST_RIP, guest_rip + insn_len); 575 return VMX_TEST_RESUME; 576 case VMX_CR: 577 switch (vmx_get_test_stage()) { 578 case 4: 579 report(0, "Read shadowing CR0"); 580 vmx_inc_test_stage(); 581 break; 582 case 5: 583 report(0, "Read shadowing CR4"); 584 vmx_inc_test_stage(); 585 break; 586 case 6: 587 report(0, "Write shadowing CR0 (same value)"); 588 vmx_inc_test_stage(); 589 break; 590 case 7: 591 report(0, "Write shadowing CR4 (same value)"); 592 vmx_inc_test_stage(); 593 break; 594 case 8: 595 case 9: 596 // 0x600 encodes "mov %esi, %cr0" 597 if (exit_qual == 0x600) 598 vmx_inc_test_stage(); 599 break; 600 case 10: 601 case 11: 602 // 0x604 encodes "mov %esi, %cr4" 603 if (exit_qual == 0x604) 604 vmx_inc_test_stage(); 605 break; 606 default: 607 // Should not reach here 608 report(false, "unexpected stage, %d", 609 vmx_get_test_stage()); 610 print_vmexit_info(exit_reason); 611 return VMX_TEST_VMEXIT; 612 } 613 vmcs_write(GUEST_RIP, guest_rip + insn_len); 614 return VMX_TEST_RESUME; 615 default: 616 report(false, "Unknown exit reason, 0x%x", exit_reason.full); 617 print_vmexit_info(exit_reason); 618 } 619 return VMX_TEST_VMEXIT; 620 } 621 622 static int iobmp_init(struct vmcs *vmcs) 623 { 624 u32 ctrl_cpu0; 625 626 io_bitmap_a = alloc_page(); 627 io_bitmap_b = alloc_page(); 628 ctrl_cpu0 = vmcs_read(CPU_EXEC_CTRL0); 629 ctrl_cpu0 |= CPU_IO_BITMAP; 630 ctrl_cpu0 &= (~CPU_IO); 631 vmcs_write(CPU_EXEC_CTRL0, ctrl_cpu0); 632 vmcs_write(IO_BITMAP_A, (u64)io_bitmap_a); 633 vmcs_write(IO_BITMAP_B, (u64)io_bitmap_b); 634 return VMX_TEST_START; 635 } 636 637 static void iobmp_main(void) 638 { 639 // stage 0, test IO pass 640 vmx_set_test_stage(0); 641 inb(0x5000); 642 outb(0x0, 0x5000); 643 report(vmx_get_test_stage() == 0, "I/O bitmap - I/O pass"); 644 // test IO width, in/out 645 ((u8 *)io_bitmap_a)[0] = 0xFF; 646 vmx_set_test_stage(2); 647 inb(0x0); 648 report(vmx_get_test_stage() == 3, "I/O bitmap - trap in"); 649 vmx_set_test_stage(3); 650 outw(0x0, 0x0); 651 report(vmx_get_test_stage() == 4, "I/O bitmap - trap out"); 652 vmx_set_test_stage(4); 653 inl(0x0); 654 report(vmx_get_test_stage() == 5, "I/O bitmap - I/O width, long"); 655 // test low/high IO port 656 vmx_set_test_stage(5); 657 ((u8 *)io_bitmap_a)[0x5000 / 8] = (1 << (0x5000 % 8)); 658 inb(0x5000); 659 report(vmx_get_test_stage() == 6, "I/O bitmap - I/O port, low part"); 660 vmx_set_test_stage(6); 661 ((u8 *)io_bitmap_b)[0x1000 / 8] = (1 << (0x1000 % 8)); 662 inb(0x9000); 663 report(vmx_get_test_stage() == 7, "I/O bitmap - I/O port, high part"); 664 // test partial pass 665 vmx_set_test_stage(7); 666 inl(0x4FFF); 667 report(vmx_get_test_stage() == 8, "I/O bitmap - partial pass"); 668 // test overrun 669 vmx_set_test_stage(8); 670 memset(io_bitmap_a, 0x0, PAGE_SIZE); 671 memset(io_bitmap_b, 0x0, PAGE_SIZE); 672 inl(0xFFFF); 673 report(vmx_get_test_stage() == 9, "I/O bitmap - overrun"); 674 vmx_set_test_stage(9); 675 vmcall(); 676 outb(0x0, 0x0); 677 report(vmx_get_test_stage() == 9, 678 "I/O bitmap - ignore unconditional exiting"); 679 vmx_set_test_stage(10); 680 vmcall(); 681 outb(0x0, 0x0); 682 report(vmx_get_test_stage() == 11, 683 "I/O bitmap - unconditional exiting"); 684 } 685 686 static int iobmp_exit_handler(union exit_reason exit_reason) 687 { 688 u64 guest_rip; 689 ulong exit_qual; 690 u32 insn_len, ctrl_cpu0; 691 692 guest_rip = vmcs_read(GUEST_RIP); 693 exit_qual = vmcs_read(EXI_QUALIFICATION); 694 insn_len = vmcs_read(EXI_INST_LEN); 695 switch (exit_reason.basic) { 696 case VMX_IO: 697 switch (vmx_get_test_stage()) { 698 case 0: 699 case 1: 700 vmx_inc_test_stage(); 701 break; 702 case 2: 703 report((exit_qual & VMX_IO_SIZE_MASK) == _VMX_IO_BYTE, 704 "I/O bitmap - I/O width, byte"); 705 report(exit_qual & VMX_IO_IN, 706 "I/O bitmap - I/O direction, in"); 707 vmx_inc_test_stage(); 708 break; 709 case 3: 710 report((exit_qual & VMX_IO_SIZE_MASK) == _VMX_IO_WORD, 711 "I/O bitmap - I/O width, word"); 712 report(!(exit_qual & VMX_IO_IN), 713 "I/O bitmap - I/O direction, out"); 714 vmx_inc_test_stage(); 715 break; 716 case 4: 717 report((exit_qual & VMX_IO_SIZE_MASK) == _VMX_IO_LONG, 718 "I/O bitmap - I/O width, long"); 719 vmx_inc_test_stage(); 720 break; 721 case 5: 722 if (((exit_qual & VMX_IO_PORT_MASK) >> VMX_IO_PORT_SHIFT) == 0x5000) 723 vmx_inc_test_stage(); 724 break; 725 case 6: 726 if (((exit_qual & VMX_IO_PORT_MASK) >> VMX_IO_PORT_SHIFT) == 0x9000) 727 vmx_inc_test_stage(); 728 break; 729 case 7: 730 if (((exit_qual & VMX_IO_PORT_MASK) >> VMX_IO_PORT_SHIFT) == 0x4FFF) 731 vmx_inc_test_stage(); 732 break; 733 case 8: 734 if (((exit_qual & VMX_IO_PORT_MASK) >> VMX_IO_PORT_SHIFT) == 0xFFFF) 735 vmx_inc_test_stage(); 736 break; 737 case 9: 738 case 10: 739 ctrl_cpu0 = vmcs_read(CPU_EXEC_CTRL0); 740 vmcs_write(CPU_EXEC_CTRL0, ctrl_cpu0 & ~CPU_IO); 741 vmx_inc_test_stage(); 742 break; 743 default: 744 // Should not reach here 745 report(false, "unexpected stage, %d", 746 vmx_get_test_stage()); 747 print_vmexit_info(exit_reason); 748 return VMX_TEST_VMEXIT; 749 } 750 vmcs_write(GUEST_RIP, guest_rip + insn_len); 751 return VMX_TEST_RESUME; 752 case VMX_VMCALL: 753 switch (vmx_get_test_stage()) { 754 case 9: 755 ctrl_cpu0 = vmcs_read(CPU_EXEC_CTRL0); 756 ctrl_cpu0 |= CPU_IO | CPU_IO_BITMAP; 757 vmcs_write(CPU_EXEC_CTRL0, ctrl_cpu0); 758 break; 759 case 10: 760 ctrl_cpu0 = vmcs_read(CPU_EXEC_CTRL0); 761 ctrl_cpu0 = (ctrl_cpu0 & ~CPU_IO_BITMAP) | CPU_IO; 762 vmcs_write(CPU_EXEC_CTRL0, ctrl_cpu0); 763 break; 764 default: 765 // Should not reach here 766 report(false, "unexpected stage, %d", 767 vmx_get_test_stage()); 768 print_vmexit_info(exit_reason); 769 return VMX_TEST_VMEXIT; 770 } 771 vmcs_write(GUEST_RIP, guest_rip + insn_len); 772 return VMX_TEST_RESUME; 773 default: 774 printf("guest_rip = %#lx\n", guest_rip); 775 printf("\tERROR : Unknown exit reason, 0x%x\n", exit_reason.full); 776 break; 777 } 778 return VMX_TEST_VMEXIT; 779 } 780 781 #define INSN_CPU0 0 782 #define INSN_CPU1 1 783 #define INSN_ALWAYS_TRAP 2 784 785 #define FIELD_EXIT_QUAL (1 << 0) 786 #define FIELD_INSN_INFO (1 << 1) 787 788 asm( 789 "insn_hlt: hlt;ret\n\t" 790 "insn_invlpg: invlpg 0x12345678;ret\n\t" 791 "insn_mwait: xor %eax, %eax; xor %ecx, %ecx; mwait;ret\n\t" 792 "insn_rdpmc: xor %ecx, %ecx; rdpmc;ret\n\t" 793 "insn_rdtsc: rdtsc;ret\n\t" 794 "insn_cr3_load: mov cr3,%rax; mov %rax,%cr3;ret\n\t" 795 "insn_cr3_store: mov %cr3,%rax;ret\n\t" 796 #ifdef __x86_64__ 797 "insn_cr8_load: xor %eax, %eax; mov %rax,%cr8;ret\n\t" 798 "insn_cr8_store: mov %cr8,%rax;ret\n\t" 799 #endif 800 "insn_monitor: xor %eax, %eax; xor %ecx, %ecx; xor %edx, %edx; monitor;ret\n\t" 801 "insn_pause: pause;ret\n\t" 802 "insn_wbinvd: wbinvd;ret\n\t" 803 "insn_cpuid: mov $10, %eax; cpuid;ret\n\t" 804 "insn_invd: invd;ret\n\t" 805 "insn_sgdt: sgdt gdt64_desc;ret\n\t" 806 "insn_lgdt: lgdt gdt64_desc;ret\n\t" 807 "insn_sidt: sidt idt_descr;ret\n\t" 808 "insn_lidt: lidt idt_descr;ret\n\t" 809 "insn_sldt: sldt %ax;ret\n\t" 810 "insn_lldt: xor %eax, %eax; lldt %ax;ret\n\t" 811 "insn_str: str %ax;ret\n\t" 812 "insn_rdrand: rdrand %rax;ret\n\t" 813 "insn_rdseed: rdseed %rax;ret\n\t" 814 ); 815 extern void insn_hlt(void); 816 extern void insn_invlpg(void); 817 extern void insn_mwait(void); 818 extern void insn_rdpmc(void); 819 extern void insn_rdtsc(void); 820 extern void insn_cr3_load(void); 821 extern void insn_cr3_store(void); 822 #ifdef __x86_64__ 823 extern void insn_cr8_load(void); 824 extern void insn_cr8_store(void); 825 #endif 826 extern void insn_monitor(void); 827 extern void insn_pause(void); 828 extern void insn_wbinvd(void); 829 extern void insn_sgdt(void); 830 extern void insn_lgdt(void); 831 extern void insn_sidt(void); 832 extern void insn_lidt(void); 833 extern void insn_sldt(void); 834 extern void insn_lldt(void); 835 extern void insn_str(void); 836 extern void insn_cpuid(void); 837 extern void insn_invd(void); 838 extern void insn_rdrand(void); 839 extern void insn_rdseed(void); 840 841 u32 cur_insn; 842 u64 cr3; 843 844 #define X86_FEATURE_MONITOR (1 << 3) 845 846 typedef bool (*supported_fn)(void); 847 848 static bool monitor_supported(void) 849 { 850 return this_cpu_has(X86_FEATURE_MWAIT); 851 } 852 853 struct insn_table { 854 const char *name; 855 u32 flag; 856 void (*insn_func)(void); 857 u32 type; 858 u32 reason; 859 ulong exit_qual; 860 u32 insn_info; 861 // Use FIELD_EXIT_QUAL and FIELD_INSN_INFO to define 862 // which field need to be tested, reason is always tested 863 u32 test_field; 864 const supported_fn supported_fn; 865 u8 disabled; 866 }; 867 868 /* 869 * Add more test cases of instruction intercept here. Elements in this 870 * table is: 871 * name/control flag/insn function/type/exit reason/exit qulification/ 872 * instruction info/field to test 873 * The last field defines which fields (exit_qual and insn_info) need to be 874 * tested in exit handler. If set to 0, only "reason" is checked. 875 */ 876 static struct insn_table insn_table[] = { 877 // Flags for Primary Processor-Based VM-Execution Controls 878 {"HLT", CPU_HLT, insn_hlt, INSN_CPU0, 12, 0, 0, 0}, 879 {"INVLPG", CPU_INVLPG, insn_invlpg, INSN_CPU0, 14, 880 0x12345678, 0, FIELD_EXIT_QUAL}, 881 {"MWAIT", CPU_MWAIT, insn_mwait, INSN_CPU0, 36, 0, 0, 0, &monitor_supported}, 882 {"RDPMC", CPU_RDPMC, insn_rdpmc, INSN_CPU0, 15, 0, 0, 0}, 883 {"RDTSC", CPU_RDTSC, insn_rdtsc, INSN_CPU0, 16, 0, 0, 0}, 884 {"CR3 load", CPU_CR3_LOAD, insn_cr3_load, INSN_CPU0, 28, 0x3, 0, 885 FIELD_EXIT_QUAL}, 886 {"CR3 store", CPU_CR3_STORE, insn_cr3_store, INSN_CPU0, 28, 0x13, 0, 887 FIELD_EXIT_QUAL}, 888 #ifdef __x86_64__ 889 {"CR8 load", CPU_CR8_LOAD, insn_cr8_load, INSN_CPU0, 28, 0x8, 0, 890 FIELD_EXIT_QUAL}, 891 {"CR8 store", CPU_CR8_STORE, insn_cr8_store, INSN_CPU0, 28, 0x18, 0, 892 FIELD_EXIT_QUAL}, 893 #endif 894 {"MONITOR", CPU_MONITOR, insn_monitor, INSN_CPU0, 39, 0, 0, 0, &monitor_supported}, 895 {"PAUSE", CPU_PAUSE, insn_pause, INSN_CPU0, 40, 0, 0, 0}, 896 // Flags for Secondary Processor-Based VM-Execution Controls 897 {"WBINVD", CPU_WBINVD, insn_wbinvd, INSN_CPU1, 54, 0, 0, 0}, 898 {"DESC_TABLE (SGDT)", CPU_DESC_TABLE, insn_sgdt, INSN_CPU1, 46, 0, 0, 0}, 899 {"DESC_TABLE (LGDT)", CPU_DESC_TABLE, insn_lgdt, INSN_CPU1, 46, 0, 0, 0}, 900 {"DESC_TABLE (SIDT)", CPU_DESC_TABLE, insn_sidt, INSN_CPU1, 46, 0, 0, 0}, 901 {"DESC_TABLE (LIDT)", CPU_DESC_TABLE, insn_lidt, INSN_CPU1, 46, 0, 0, 0}, 902 {"DESC_TABLE (SLDT)", CPU_DESC_TABLE, insn_sldt, INSN_CPU1, 47, 0, 0, 0}, 903 {"DESC_TABLE (LLDT)", CPU_DESC_TABLE, insn_lldt, INSN_CPU1, 47, 0, 0, 0}, 904 {"DESC_TABLE (STR)", CPU_DESC_TABLE, insn_str, INSN_CPU1, 47, 0, 0, 0}, 905 /* LTR causes a #GP if done with a busy selector, so it is not tested. */ 906 {"RDRAND", CPU_RDRAND, insn_rdrand, INSN_CPU1, VMX_RDRAND, 0, 0, 0}, 907 {"RDSEED", CPU_RDSEED, insn_rdseed, INSN_CPU1, VMX_RDSEED, 0, 0, 0}, 908 // Instructions always trap 909 {"CPUID", 0, insn_cpuid, INSN_ALWAYS_TRAP, 10, 0, 0, 0}, 910 {"INVD", 0, insn_invd, INSN_ALWAYS_TRAP, 13, 0, 0, 0}, 911 // Instructions never trap 912 {NULL}, 913 }; 914 915 static int insn_intercept_init(struct vmcs *vmcs) 916 { 917 u32 ctrl_cpu, cur_insn; 918 919 ctrl_cpu = ctrl_cpu_rev[0].set | CPU_SECONDARY; 920 ctrl_cpu &= ctrl_cpu_rev[0].clr; 921 vmcs_write(CPU_EXEC_CTRL0, ctrl_cpu); 922 vmcs_write(CPU_EXEC_CTRL1, ctrl_cpu_rev[1].set); 923 cr3 = read_cr3(); 924 925 for (cur_insn = 0; insn_table[cur_insn].name != NULL; cur_insn++) { 926 if (insn_table[cur_insn].supported_fn == NULL) 927 continue; 928 insn_table[cur_insn].disabled = !insn_table[cur_insn].supported_fn(); 929 } 930 return VMX_TEST_START; 931 } 932 933 static void insn_intercept_main(void) 934 { 935 for (cur_insn = 0; insn_table[cur_insn].name != NULL; cur_insn++) { 936 vmx_set_test_stage(cur_insn * 2); 937 if ((insn_table[cur_insn].type == INSN_CPU0 && 938 !(ctrl_cpu_rev[0].clr & insn_table[cur_insn].flag)) || 939 (insn_table[cur_insn].type == INSN_CPU1 && 940 !(ctrl_cpu_rev[1].clr & insn_table[cur_insn].flag))) { 941 printf("\tCPU_CTRL%d.CPU_%s is not supported.\n", 942 insn_table[cur_insn].type - INSN_CPU0, 943 insn_table[cur_insn].name); 944 continue; 945 } 946 947 if (insn_table[cur_insn].disabled) { 948 printf("\tFeature required for %s is not supported.\n", 949 insn_table[cur_insn].name); 950 continue; 951 } 952 953 if ((insn_table[cur_insn].type == INSN_CPU0 && 954 !(ctrl_cpu_rev[0].set & insn_table[cur_insn].flag)) || 955 (insn_table[cur_insn].type == INSN_CPU1 && 956 !(ctrl_cpu_rev[1].set & insn_table[cur_insn].flag))) { 957 /* skip hlt, it stalls the guest and is tested below */ 958 if (insn_table[cur_insn].insn_func != insn_hlt) 959 insn_table[cur_insn].insn_func(); 960 report(vmx_get_test_stage() == cur_insn * 2, 961 "execute %s", 962 insn_table[cur_insn].name); 963 } else if (insn_table[cur_insn].type != INSN_ALWAYS_TRAP) 964 printf("\tCPU_CTRL%d.CPU_%s always traps.\n", 965 insn_table[cur_insn].type - INSN_CPU0, 966 insn_table[cur_insn].name); 967 968 vmcall(); 969 970 insn_table[cur_insn].insn_func(); 971 report(vmx_get_test_stage() == cur_insn * 2 + 1, 972 "intercept %s", 973 insn_table[cur_insn].name); 974 975 vmx_set_test_stage(cur_insn * 2 + 1); 976 vmcall(); 977 } 978 } 979 980 static int insn_intercept_exit_handler(union exit_reason exit_reason) 981 { 982 u64 guest_rip; 983 ulong exit_qual; 984 u32 insn_len; 985 u32 insn_info; 986 bool pass; 987 988 guest_rip = vmcs_read(GUEST_RIP); 989 exit_qual = vmcs_read(EXI_QUALIFICATION); 990 insn_len = vmcs_read(EXI_INST_LEN); 991 insn_info = vmcs_read(EXI_INST_INFO); 992 993 if (exit_reason.basic == VMX_VMCALL) { 994 u32 val = 0; 995 996 if (insn_table[cur_insn].type == INSN_CPU0) 997 val = vmcs_read(CPU_EXEC_CTRL0); 998 else if (insn_table[cur_insn].type == INSN_CPU1) 999 val = vmcs_read(CPU_EXEC_CTRL1); 1000 1001 if (vmx_get_test_stage() & 1) 1002 val &= ~insn_table[cur_insn].flag; 1003 else 1004 val |= insn_table[cur_insn].flag; 1005 1006 if (insn_table[cur_insn].type == INSN_CPU0) 1007 vmcs_write(CPU_EXEC_CTRL0, val | ctrl_cpu_rev[0].set); 1008 else if (insn_table[cur_insn].type == INSN_CPU1) 1009 vmcs_write(CPU_EXEC_CTRL1, val | ctrl_cpu_rev[1].set); 1010 } else { 1011 pass = (cur_insn * 2 == vmx_get_test_stage()) && 1012 insn_table[cur_insn].reason == exit_reason.full; 1013 if (insn_table[cur_insn].test_field & FIELD_EXIT_QUAL && 1014 insn_table[cur_insn].exit_qual != exit_qual) 1015 pass = false; 1016 if (insn_table[cur_insn].test_field & FIELD_INSN_INFO && 1017 insn_table[cur_insn].insn_info != insn_info) 1018 pass = false; 1019 if (pass) 1020 vmx_inc_test_stage(); 1021 } 1022 vmcs_write(GUEST_RIP, guest_rip + insn_len); 1023 return VMX_TEST_RESUME; 1024 } 1025 1026 /** 1027 * __setup_ept - Setup the VMCS fields to enable Extended Page Tables (EPT) 1028 * @hpa: Host physical address of the top-level, a.k.a. root, EPT table 1029 * @enable_ad: Whether or not to enable Access/Dirty bits for EPT entries 1030 * 1031 * Returns 0 on success, 1 on failure. 1032 * 1033 * Note that @hpa doesn't need to point at actual memory if VM-Launch is 1034 * expected to fail, e.g. setup_dummy_ept() arbitrarily passes '0' to satisfy 1035 * the various EPTP consistency checks, but doesn't ensure backing for HPA '0'. 1036 */ 1037 static int __setup_ept(u64 hpa, bool enable_ad) 1038 { 1039 if (!(ctrl_cpu_rev[0].clr & CPU_SECONDARY) || 1040 !(ctrl_cpu_rev[1].clr & CPU_EPT)) { 1041 printf("\tEPT is not supported"); 1042 return 1; 1043 } 1044 if (!(ept_vpid.val & EPT_CAP_WB)) { 1045 printf("WB memtype for EPT walks not supported\n"); 1046 return 1; 1047 } 1048 if (!(ept_vpid.val & EPT_CAP_PWL4)) { 1049 printf("\tPWL4 is not supported\n"); 1050 return 1; 1051 } 1052 1053 eptp = EPT_MEM_TYPE_WB; 1054 eptp |= (3 << EPTP_PG_WALK_LEN_SHIFT); 1055 eptp |= hpa; 1056 if (enable_ad) 1057 eptp |= EPTP_AD_FLAG; 1058 1059 vmcs_write(EPTP, eptp); 1060 vmcs_write(CPU_EXEC_CTRL0, vmcs_read(CPU_EXEC_CTRL0)| CPU_SECONDARY); 1061 vmcs_write(CPU_EXEC_CTRL1, vmcs_read(CPU_EXEC_CTRL1)| CPU_EPT); 1062 1063 return 0; 1064 } 1065 1066 /** 1067 * setup_ept - Enable Extended Page Tables (EPT) and setup an identity map 1068 * @enable_ad: Whether or not to enable Access/Dirty bits for EPT entries 1069 * 1070 * Returns 0 on success, 1 on failure. 1071 * 1072 * This is the "real" function for setting up EPT tables, i.e. use this for 1073 * tests that need to run code in the guest with EPT enabled. 1074 */ 1075 static int setup_ept(bool enable_ad) 1076 { 1077 unsigned long end_of_memory; 1078 1079 pml4 = alloc_page(); 1080 1081 if (__setup_ept(virt_to_phys(pml4), enable_ad)) 1082 return 1; 1083 1084 end_of_memory = fwcfg_get_u64(FW_CFG_RAM_SIZE); 1085 if (end_of_memory < (1ul << 32)) 1086 end_of_memory = (1ul << 32); 1087 /* Cannot use large EPT pages if we need to track EPT 1088 * accessed/dirty bits at 4K granularity. 1089 */ 1090 setup_ept_range(pml4, 0, end_of_memory, 0, 1091 !enable_ad && ept_2m_supported(), 1092 EPT_WA | EPT_RA | EPT_EA); 1093 return 0; 1094 } 1095 1096 /** 1097 * setup_dummy_ept - Enable Extended Page Tables (EPT) with a dummy root HPA 1098 * 1099 * Setup EPT using a semi-arbitrary dummy root HPA. This function is intended 1100 * for use by tests that need EPT enabled to verify dependent VMCS controls 1101 * but never expect to fully enter the guest, i.e. don't need setup the actual 1102 * EPT tables. 1103 */ 1104 static void setup_dummy_ept(void) 1105 { 1106 if (__setup_ept(0, false)) 1107 report_abort("EPT setup unexpectedly failed"); 1108 } 1109 1110 static int enable_unrestricted_guest(void) 1111 { 1112 if (!(ctrl_cpu_rev[0].clr & CPU_SECONDARY) || 1113 !(ctrl_cpu_rev[1].clr & CPU_URG) || 1114 !(ctrl_cpu_rev[1].clr & CPU_EPT)) 1115 return 1; 1116 1117 setup_dummy_ept(); 1118 1119 vmcs_write(CPU_EXEC_CTRL0, vmcs_read(CPU_EXEC_CTRL0) | CPU_SECONDARY); 1120 vmcs_write(CPU_EXEC_CTRL1, vmcs_read(CPU_EXEC_CTRL1) | CPU_URG); 1121 1122 return 0; 1123 } 1124 1125 static void ept_enable_ad_bits(void) 1126 { 1127 eptp |= EPTP_AD_FLAG; 1128 vmcs_write(EPTP, eptp); 1129 } 1130 1131 static void ept_disable_ad_bits(void) 1132 { 1133 eptp &= ~EPTP_AD_FLAG; 1134 vmcs_write(EPTP, eptp); 1135 } 1136 1137 static int ept_ad_enabled(void) 1138 { 1139 return eptp & EPTP_AD_FLAG; 1140 } 1141 1142 static void ept_enable_ad_bits_or_skip_test(void) 1143 { 1144 if (!ept_ad_bits_supported()) 1145 test_skip("EPT AD bits not supported."); 1146 ept_enable_ad_bits(); 1147 } 1148 1149 static int apic_version; 1150 1151 static int ept_init_common(bool have_ad) 1152 { 1153 int ret; 1154 struct pci_dev pcidev; 1155 1156 if (setup_ept(have_ad)) 1157 return VMX_TEST_EXIT; 1158 data_page1 = alloc_page(); 1159 data_page2 = alloc_page(); 1160 *((u32 *)data_page1) = MAGIC_VAL_1; 1161 *((u32 *)data_page2) = MAGIC_VAL_2; 1162 install_ept(pml4, (unsigned long)data_page1, (unsigned long)data_page2, 1163 EPT_RA | EPT_WA | EPT_EA); 1164 1165 apic_version = apic_read(APIC_LVR); 1166 1167 ret = pci_find_dev(PCI_VENDOR_ID_REDHAT, PCI_DEVICE_ID_REDHAT_TEST); 1168 if (ret != PCIDEVADDR_INVALID) { 1169 pci_dev_init(&pcidev, ret); 1170 pci_physaddr = pcidev.resource[PCI_TESTDEV_BAR_MEM]; 1171 } 1172 1173 return VMX_TEST_START; 1174 } 1175 1176 static int ept_init(struct vmcs *vmcs) 1177 { 1178 return ept_init_common(false); 1179 } 1180 1181 static void ept_common(void) 1182 { 1183 vmx_set_test_stage(0); 1184 if (*((u32 *)data_page2) != MAGIC_VAL_1 || 1185 *((u32 *)data_page1) != MAGIC_VAL_1) 1186 report(0, "EPT basic framework - read"); 1187 else { 1188 *((u32 *)data_page2) = MAGIC_VAL_3; 1189 vmcall(); 1190 if (vmx_get_test_stage() == 1) { 1191 if (*((u32 *)data_page1) == MAGIC_VAL_3 && 1192 *((u32 *)data_page2) == MAGIC_VAL_2) 1193 report(1, "EPT basic framework"); 1194 else 1195 report(1, "EPT basic framework - remap"); 1196 } 1197 } 1198 // Test EPT Misconfigurations 1199 vmx_set_test_stage(1); 1200 vmcall(); 1201 *((u32 *)data_page1) = MAGIC_VAL_1; 1202 if (vmx_get_test_stage() != 2) { 1203 report(0, "EPT misconfigurations"); 1204 goto t1; 1205 } 1206 vmx_set_test_stage(2); 1207 vmcall(); 1208 *((u32 *)data_page1) = MAGIC_VAL_1; 1209 report(vmx_get_test_stage() == 3, "EPT misconfigurations"); 1210 t1: 1211 // Test EPT violation 1212 vmx_set_test_stage(3); 1213 vmcall(); 1214 *((u32 *)data_page1) = MAGIC_VAL_1; 1215 report(vmx_get_test_stage() == 4, "EPT violation - page permission"); 1216 // Violation caused by EPT paging structure 1217 vmx_set_test_stage(4); 1218 vmcall(); 1219 *((u32 *)data_page1) = MAGIC_VAL_2; 1220 report(vmx_get_test_stage() == 5, "EPT violation - paging structure"); 1221 1222 // MMIO Read/Write 1223 vmx_set_test_stage(5); 1224 vmcall(); 1225 1226 *(u32 volatile *)pci_physaddr; 1227 report(vmx_get_test_stage() == 6, "MMIO EPT violation - read"); 1228 1229 *(u32 volatile *)pci_physaddr = MAGIC_VAL_1; 1230 report(vmx_get_test_stage() == 7, "MMIO EPT violation - write"); 1231 } 1232 1233 static void ept_main(void) 1234 { 1235 ept_common(); 1236 1237 // Test EPT access to L1 MMIO 1238 vmx_set_test_stage(7); 1239 report(*((u32 *)0xfee00030UL) == apic_version, "EPT - MMIO access"); 1240 1241 // Test invalid operand for INVEPT 1242 vmcall(); 1243 report(vmx_get_test_stage() == 8, "EPT - unsupported INVEPT"); 1244 } 1245 1246 static bool invept_test(int type, u64 eptp) 1247 { 1248 bool ret, supported; 1249 1250 supported = ept_vpid.val & (EPT_CAP_INVEPT_SINGLE >> INVEPT_SINGLE << type); 1251 ret = invept(type, eptp); 1252 1253 if (ret == !supported) 1254 return false; 1255 1256 if (!supported) 1257 printf("WARNING: unsupported invept passed!\n"); 1258 else 1259 printf("WARNING: invept failed!\n"); 1260 1261 return true; 1262 } 1263 1264 static int pml_exit_handler(union exit_reason exit_reason) 1265 { 1266 u16 index, count; 1267 u64 *pmlbuf = pml_log; 1268 u64 guest_rip = vmcs_read(GUEST_RIP);; 1269 u64 guest_cr3 = vmcs_read(GUEST_CR3); 1270 u32 insn_len = vmcs_read(EXI_INST_LEN); 1271 1272 switch (exit_reason.basic) { 1273 case VMX_VMCALL: 1274 switch (vmx_get_test_stage()) { 1275 case 0: 1276 index = vmcs_read(GUEST_PML_INDEX); 1277 for (count = index + 1; count < PML_INDEX; count++) { 1278 if (pmlbuf[count] == (u64)data_page2) { 1279 vmx_inc_test_stage(); 1280 clear_ept_ad(pml4, guest_cr3, (unsigned long)data_page2); 1281 break; 1282 } 1283 } 1284 break; 1285 case 1: 1286 index = vmcs_read(GUEST_PML_INDEX); 1287 /* Keep clearing the dirty bit till a overflow */ 1288 clear_ept_ad(pml4, guest_cr3, (unsigned long)data_page2); 1289 break; 1290 default: 1291 report(false, "unexpected stage, %d.", 1292 vmx_get_test_stage()); 1293 print_vmexit_info(exit_reason); 1294 return VMX_TEST_VMEXIT; 1295 } 1296 vmcs_write(GUEST_RIP, guest_rip + insn_len); 1297 return VMX_TEST_RESUME; 1298 case VMX_PML_FULL: 1299 vmx_inc_test_stage(); 1300 vmcs_write(GUEST_PML_INDEX, PML_INDEX - 1); 1301 return VMX_TEST_RESUME; 1302 default: 1303 report(false, "Unknown exit reason, 0x%x", exit_reason.full); 1304 print_vmexit_info(exit_reason); 1305 } 1306 return VMX_TEST_VMEXIT; 1307 } 1308 1309 static int ept_exit_handler_common(union exit_reason exit_reason, bool have_ad) 1310 { 1311 u64 guest_rip; 1312 u64 guest_cr3; 1313 u32 insn_len; 1314 u32 exit_qual; 1315 static unsigned long data_page1_pte, data_page1_pte_pte, memaddr_pte, 1316 guest_pte_addr; 1317 1318 guest_rip = vmcs_read(GUEST_RIP); 1319 guest_cr3 = vmcs_read(GUEST_CR3); 1320 insn_len = vmcs_read(EXI_INST_LEN); 1321 exit_qual = vmcs_read(EXI_QUALIFICATION); 1322 pteval_t *ptep; 1323 switch (exit_reason.basic) { 1324 case VMX_VMCALL: 1325 switch (vmx_get_test_stage()) { 1326 case 0: 1327 check_ept_ad(pml4, guest_cr3, 1328 (unsigned long)data_page1, 1329 have_ad ? EPT_ACCESS_FLAG : 0, 1330 have_ad ? EPT_ACCESS_FLAG | EPT_DIRTY_FLAG : 0); 1331 check_ept_ad(pml4, guest_cr3, 1332 (unsigned long)data_page2, 1333 have_ad ? EPT_ACCESS_FLAG | EPT_DIRTY_FLAG : 0, 1334 have_ad ? EPT_ACCESS_FLAG | EPT_DIRTY_FLAG : 0); 1335 clear_ept_ad(pml4, guest_cr3, (unsigned long)data_page1); 1336 clear_ept_ad(pml4, guest_cr3, (unsigned long)data_page2); 1337 if (have_ad) 1338 ept_sync(INVEPT_SINGLE, eptp);; 1339 if (*((u32 *)data_page1) == MAGIC_VAL_3 && 1340 *((u32 *)data_page2) == MAGIC_VAL_2) { 1341 vmx_inc_test_stage(); 1342 install_ept(pml4, (unsigned long)data_page2, 1343 (unsigned long)data_page2, 1344 EPT_RA | EPT_WA | EPT_EA); 1345 } else 1346 report(0, "EPT basic framework - write"); 1347 break; 1348 case 1: 1349 install_ept(pml4, (unsigned long)data_page1, 1350 (unsigned long)data_page1, EPT_WA); 1351 ept_sync(INVEPT_SINGLE, eptp); 1352 break; 1353 case 2: 1354 install_ept(pml4, (unsigned long)data_page1, 1355 (unsigned long)data_page1, 1356 EPT_RA | EPT_WA | EPT_EA | 1357 (2 << EPT_MEM_TYPE_SHIFT)); 1358 ept_sync(INVEPT_SINGLE, eptp); 1359 break; 1360 case 3: 1361 clear_ept_ad(pml4, guest_cr3, (unsigned long)data_page1); 1362 TEST_ASSERT(get_ept_pte(pml4, (unsigned long)data_page1, 1363 1, &data_page1_pte)); 1364 set_ept_pte(pml4, (unsigned long)data_page1, 1365 1, data_page1_pte & ~EPT_PRESENT); 1366 ept_sync(INVEPT_SINGLE, eptp); 1367 break; 1368 case 4: 1369 ptep = get_pte_level((pgd_t *)guest_cr3, data_page1, /*level=*/2); 1370 guest_pte_addr = virt_to_phys(ptep) & PAGE_MASK; 1371 1372 TEST_ASSERT(get_ept_pte(pml4, guest_pte_addr, 2, &data_page1_pte_pte)); 1373 set_ept_pte(pml4, guest_pte_addr, 2, 1374 data_page1_pte_pte & ~EPT_PRESENT); 1375 ept_sync(INVEPT_SINGLE, eptp); 1376 break; 1377 case 5: 1378 install_ept(pml4, (unsigned long)pci_physaddr, 1379 (unsigned long)pci_physaddr, 0); 1380 ept_sync(INVEPT_SINGLE, eptp); 1381 break; 1382 case 7: 1383 if (!invept_test(0, eptp)) 1384 vmx_inc_test_stage(); 1385 break; 1386 // Should not reach here 1387 default: 1388 report(false, "ERROR - unexpected stage, %d.", 1389 vmx_get_test_stage()); 1390 print_vmexit_info(exit_reason); 1391 return VMX_TEST_VMEXIT; 1392 } 1393 vmcs_write(GUEST_RIP, guest_rip + insn_len); 1394 return VMX_TEST_RESUME; 1395 case VMX_EPT_MISCONFIG: 1396 switch (vmx_get_test_stage()) { 1397 case 1: 1398 case 2: 1399 vmx_inc_test_stage(); 1400 install_ept(pml4, (unsigned long)data_page1, 1401 (unsigned long)data_page1, 1402 EPT_RA | EPT_WA | EPT_EA); 1403 ept_sync(INVEPT_SINGLE, eptp); 1404 break; 1405 // Should not reach here 1406 default: 1407 report(false, "ERROR - unexpected stage, %d.", 1408 vmx_get_test_stage()); 1409 print_vmexit_info(exit_reason); 1410 return VMX_TEST_VMEXIT; 1411 } 1412 return VMX_TEST_RESUME; 1413 case VMX_EPT_VIOLATION: 1414 /* 1415 * Exit-qualifications are masked not to account for advanced 1416 * VM-exit information. Once KVM supports this feature, this 1417 * masking should be removed. 1418 */ 1419 exit_qual &= ~EPT_VLT_GUEST_MASK; 1420 1421 switch(vmx_get_test_stage()) { 1422 case 3: 1423 check_ept_ad(pml4, guest_cr3, (unsigned long)data_page1, 0, 1424 have_ad ? EPT_ACCESS_FLAG | EPT_DIRTY_FLAG : 0); 1425 clear_ept_ad(pml4, guest_cr3, (unsigned long)data_page1); 1426 if (exit_qual == (EPT_VLT_WR | EPT_VLT_LADDR_VLD | 1427 EPT_VLT_PADDR)) 1428 vmx_inc_test_stage(); 1429 set_ept_pte(pml4, (unsigned long)data_page1, 1430 1, data_page1_pte | (EPT_PRESENT)); 1431 ept_sync(INVEPT_SINGLE, eptp); 1432 break; 1433 case 4: 1434 check_ept_ad(pml4, guest_cr3, (unsigned long)data_page1, 0, 1435 have_ad ? EPT_ACCESS_FLAG | EPT_DIRTY_FLAG : 0); 1436 clear_ept_ad(pml4, guest_cr3, (unsigned long)data_page1); 1437 if (exit_qual == (EPT_VLT_RD | 1438 (have_ad ? EPT_VLT_WR : 0) | 1439 EPT_VLT_LADDR_VLD)) 1440 vmx_inc_test_stage(); 1441 set_ept_pte(pml4, guest_pte_addr, 2, 1442 data_page1_pte_pte | (EPT_PRESENT)); 1443 ept_sync(INVEPT_SINGLE, eptp); 1444 break; 1445 case 5: 1446 if (exit_qual & EPT_VLT_RD) 1447 vmx_inc_test_stage(); 1448 TEST_ASSERT(get_ept_pte(pml4, (unsigned long)pci_physaddr, 1449 1, &memaddr_pte)); 1450 set_ept_pte(pml4, memaddr_pte, 1, memaddr_pte | EPT_RA); 1451 ept_sync(INVEPT_SINGLE, eptp); 1452 break; 1453 case 6: 1454 if (exit_qual & EPT_VLT_WR) 1455 vmx_inc_test_stage(); 1456 TEST_ASSERT(get_ept_pte(pml4, (unsigned long)pci_physaddr, 1457 1, &memaddr_pte)); 1458 set_ept_pte(pml4, memaddr_pte, 1, memaddr_pte | EPT_RA | EPT_WA); 1459 ept_sync(INVEPT_SINGLE, eptp); 1460 break; 1461 default: 1462 // Should not reach here 1463 report(false, "ERROR : unexpected stage, %d", 1464 vmx_get_test_stage()); 1465 print_vmexit_info(exit_reason); 1466 return VMX_TEST_VMEXIT; 1467 } 1468 return VMX_TEST_RESUME; 1469 default: 1470 report(false, "Unknown exit reason, 0x%x", exit_reason.full); 1471 print_vmexit_info(exit_reason); 1472 } 1473 return VMX_TEST_VMEXIT; 1474 } 1475 1476 static int ept_exit_handler(union exit_reason exit_reason) 1477 { 1478 return ept_exit_handler_common(exit_reason, false); 1479 } 1480 1481 static int eptad_init(struct vmcs *vmcs) 1482 { 1483 int r = ept_init_common(true); 1484 1485 if (r == VMX_TEST_EXIT) 1486 return r; 1487 1488 if ((rdmsr(MSR_IA32_VMX_EPT_VPID_CAP) & EPT_CAP_AD_FLAG) == 0) { 1489 printf("\tEPT A/D bits are not supported"); 1490 return VMX_TEST_EXIT; 1491 } 1492 1493 return r; 1494 } 1495 1496 static int pml_init(struct vmcs *vmcs) 1497 { 1498 u32 ctrl_cpu; 1499 int r = eptad_init(vmcs); 1500 1501 if (r == VMX_TEST_EXIT) 1502 return r; 1503 1504 if (!(ctrl_cpu_rev[0].clr & CPU_SECONDARY) || 1505 !(ctrl_cpu_rev[1].clr & CPU_PML)) { 1506 printf("\tPML is not supported"); 1507 return VMX_TEST_EXIT; 1508 } 1509 1510 pml_log = alloc_page(); 1511 vmcs_write(PMLADDR, (u64)pml_log); 1512 vmcs_write(GUEST_PML_INDEX, PML_INDEX - 1); 1513 1514 ctrl_cpu = vmcs_read(CPU_EXEC_CTRL1) | CPU_PML; 1515 vmcs_write(CPU_EXEC_CTRL1, ctrl_cpu); 1516 1517 return VMX_TEST_START; 1518 } 1519 1520 static void pml_main(void) 1521 { 1522 int count = 0; 1523 1524 vmx_set_test_stage(0); 1525 *((u32 *)data_page2) = 0x1; 1526 vmcall(); 1527 report(vmx_get_test_stage() == 1, "PML - Dirty GPA Logging"); 1528 1529 while (vmx_get_test_stage() == 1) { 1530 vmcall(); 1531 *((u32 *)data_page2) = 0x1; 1532 if (count++ > PML_INDEX) 1533 break; 1534 } 1535 report(vmx_get_test_stage() == 2, "PML Full Event"); 1536 } 1537 1538 static void eptad_main(void) 1539 { 1540 ept_common(); 1541 } 1542 1543 static int eptad_exit_handler(union exit_reason exit_reason) 1544 { 1545 return ept_exit_handler_common(exit_reason, true); 1546 } 1547 1548 static bool invvpid_test(int type, u16 vpid) 1549 { 1550 bool ret, supported; 1551 1552 supported = ept_vpid.val & 1553 (VPID_CAP_INVVPID_ADDR >> INVVPID_ADDR << type); 1554 ret = invvpid(type, vpid, 0); 1555 1556 if (ret == !supported) 1557 return false; 1558 1559 if (!supported) 1560 printf("WARNING: unsupported invvpid passed!\n"); 1561 else 1562 printf("WARNING: invvpid failed!\n"); 1563 1564 return true; 1565 } 1566 1567 static int vpid_init(struct vmcs *vmcs) 1568 { 1569 u32 ctrl_cpu1; 1570 1571 if (!(ctrl_cpu_rev[0].clr & CPU_SECONDARY) || 1572 !(ctrl_cpu_rev[1].clr & CPU_VPID)) { 1573 printf("\tVPID is not supported"); 1574 return VMX_TEST_EXIT; 1575 } 1576 1577 ctrl_cpu1 = vmcs_read(CPU_EXEC_CTRL1); 1578 ctrl_cpu1 |= CPU_VPID; 1579 vmcs_write(CPU_EXEC_CTRL1, ctrl_cpu1); 1580 return VMX_TEST_START; 1581 } 1582 1583 static void vpid_main(void) 1584 { 1585 vmx_set_test_stage(0); 1586 vmcall(); 1587 report(vmx_get_test_stage() == 1, "INVVPID SINGLE ADDRESS"); 1588 vmx_set_test_stage(2); 1589 vmcall(); 1590 report(vmx_get_test_stage() == 3, "INVVPID SINGLE"); 1591 vmx_set_test_stage(4); 1592 vmcall(); 1593 report(vmx_get_test_stage() == 5, "INVVPID ALL"); 1594 } 1595 1596 static int vpid_exit_handler(union exit_reason exit_reason) 1597 { 1598 u64 guest_rip; 1599 u32 insn_len; 1600 1601 guest_rip = vmcs_read(GUEST_RIP); 1602 insn_len = vmcs_read(EXI_INST_LEN); 1603 1604 switch (exit_reason.basic) { 1605 case VMX_VMCALL: 1606 switch(vmx_get_test_stage()) { 1607 case 0: 1608 if (!invvpid_test(INVVPID_ADDR, 1)) 1609 vmx_inc_test_stage(); 1610 break; 1611 case 2: 1612 if (!invvpid_test(INVVPID_CONTEXT_GLOBAL, 1)) 1613 vmx_inc_test_stage(); 1614 break; 1615 case 4: 1616 if (!invvpid_test(INVVPID_ALL, 1)) 1617 vmx_inc_test_stage(); 1618 break; 1619 default: 1620 report(false, "ERROR: unexpected stage, %d", 1621 vmx_get_test_stage()); 1622 print_vmexit_info(exit_reason); 1623 return VMX_TEST_VMEXIT; 1624 } 1625 vmcs_write(GUEST_RIP, guest_rip + insn_len); 1626 return VMX_TEST_RESUME; 1627 default: 1628 report(false, "Unknown exit reason, 0x%x", exit_reason.full); 1629 print_vmexit_info(exit_reason); 1630 } 1631 return VMX_TEST_VMEXIT; 1632 } 1633 1634 #define TIMER_VECTOR 222 1635 1636 static volatile bool timer_fired; 1637 1638 static void timer_isr(isr_regs_t *regs) 1639 { 1640 timer_fired = true; 1641 apic_write(APIC_EOI, 0); 1642 } 1643 1644 static int interrupt_init(struct vmcs *vmcs) 1645 { 1646 msr_bmp_init(); 1647 vmcs_write(PIN_CONTROLS, vmcs_read(PIN_CONTROLS) & ~PIN_EXTINT); 1648 handle_irq(TIMER_VECTOR, timer_isr); 1649 return VMX_TEST_START; 1650 } 1651 1652 static void interrupt_main(void) 1653 { 1654 long long start, loops; 1655 1656 vmx_set_test_stage(0); 1657 1658 apic_write(APIC_LVTT, TIMER_VECTOR); 1659 irq_enable(); 1660 1661 apic_write(APIC_TMICT, 1); 1662 for (loops = 0; loops < 10000000 && !timer_fired; loops++) 1663 asm volatile ("nop"); 1664 report(timer_fired, "direct interrupt while running guest"); 1665 1666 apic_write(APIC_TMICT, 0); 1667 irq_disable(); 1668 vmcall(); 1669 timer_fired = false; 1670 apic_write(APIC_TMICT, 1); 1671 for (loops = 0; loops < 10000000 && !timer_fired; loops++) 1672 asm volatile ("nop"); 1673 report(timer_fired, "intercepted interrupt while running guest"); 1674 1675 irq_enable(); 1676 apic_write(APIC_TMICT, 0); 1677 irq_disable(); 1678 vmcall(); 1679 timer_fired = false; 1680 start = rdtsc(); 1681 apic_write(APIC_TMICT, 1000000); 1682 1683 asm volatile ("sti; hlt"); 1684 1685 report(rdtsc() - start > 1000000 && timer_fired, 1686 "direct interrupt + hlt"); 1687 1688 apic_write(APIC_TMICT, 0); 1689 irq_disable(); 1690 vmcall(); 1691 timer_fired = false; 1692 start = rdtsc(); 1693 apic_write(APIC_TMICT, 1000000); 1694 1695 asm volatile ("sti; hlt"); 1696 1697 report(rdtsc() - start > 10000 && timer_fired, 1698 "intercepted interrupt + hlt"); 1699 1700 apic_write(APIC_TMICT, 0); 1701 irq_disable(); 1702 vmcall(); 1703 timer_fired = false; 1704 start = rdtsc(); 1705 apic_write(APIC_TMICT, 1000000); 1706 1707 irq_enable(); 1708 asm volatile ("nop"); 1709 vmcall(); 1710 1711 report(rdtsc() - start > 10000 && timer_fired, 1712 "direct interrupt + activity state hlt"); 1713 1714 apic_write(APIC_TMICT, 0); 1715 irq_disable(); 1716 vmcall(); 1717 timer_fired = false; 1718 start = rdtsc(); 1719 apic_write(APIC_TMICT, 1000000); 1720 1721 irq_enable(); 1722 asm volatile ("nop"); 1723 vmcall(); 1724 1725 report(rdtsc() - start > 10000 && timer_fired, 1726 "intercepted interrupt + activity state hlt"); 1727 1728 apic_write(APIC_TMICT, 0); 1729 irq_disable(); 1730 vmx_set_test_stage(7); 1731 vmcall(); 1732 timer_fired = false; 1733 apic_write(APIC_TMICT, 1); 1734 for (loops = 0; loops < 10000000 && !timer_fired; loops++) 1735 asm volatile ("nop"); 1736 report(timer_fired, 1737 "running a guest with interrupt acknowledgement set"); 1738 1739 apic_write(APIC_TMICT, 0); 1740 irq_enable(); 1741 timer_fired = false; 1742 vmcall(); 1743 report(timer_fired, "Inject an event to a halted guest"); 1744 } 1745 1746 static int interrupt_exit_handler(union exit_reason exit_reason) 1747 { 1748 u64 guest_rip = vmcs_read(GUEST_RIP); 1749 u32 insn_len = vmcs_read(EXI_INST_LEN); 1750 1751 switch (exit_reason.basic) { 1752 case VMX_VMCALL: 1753 switch (vmx_get_test_stage()) { 1754 case 0: 1755 case 2: 1756 case 5: 1757 vmcs_write(PIN_CONTROLS, 1758 vmcs_read(PIN_CONTROLS) | PIN_EXTINT); 1759 break; 1760 case 7: 1761 vmcs_write(EXI_CONTROLS, vmcs_read(EXI_CONTROLS) | EXI_INTA); 1762 vmcs_write(PIN_CONTROLS, 1763 vmcs_read(PIN_CONTROLS) | PIN_EXTINT); 1764 break; 1765 case 1: 1766 case 3: 1767 vmcs_write(PIN_CONTROLS, 1768 vmcs_read(PIN_CONTROLS) & ~PIN_EXTINT); 1769 break; 1770 case 4: 1771 case 6: 1772 vmcs_write(GUEST_ACTV_STATE, ACTV_HLT); 1773 break; 1774 1775 case 8: 1776 vmcs_write(GUEST_ACTV_STATE, ACTV_HLT); 1777 vmcs_write(ENT_INTR_INFO, 1778 TIMER_VECTOR | 1779 (VMX_INTR_TYPE_EXT_INTR << INTR_INFO_INTR_TYPE_SHIFT) | 1780 INTR_INFO_VALID_MASK); 1781 break; 1782 } 1783 vmx_inc_test_stage(); 1784 vmcs_write(GUEST_RIP, guest_rip + insn_len); 1785 return VMX_TEST_RESUME; 1786 case VMX_EXTINT: 1787 if (vmcs_read(EXI_CONTROLS) & EXI_INTA) { 1788 int vector = vmcs_read(EXI_INTR_INFO) & 0xff; 1789 handle_external_interrupt(vector); 1790 } else { 1791 irq_enable(); 1792 asm volatile ("nop"); 1793 irq_disable(); 1794 } 1795 if (vmx_get_test_stage() >= 2) 1796 vmcs_write(GUEST_ACTV_STATE, ACTV_ACTIVE); 1797 return VMX_TEST_RESUME; 1798 default: 1799 report(false, "Unknown exit reason, 0x%x", exit_reason.full); 1800 print_vmexit_info(exit_reason); 1801 } 1802 1803 return VMX_TEST_VMEXIT; 1804 } 1805 1806 static int dbgctls_init(struct vmcs *vmcs) 1807 { 1808 u64 dr7 = 0x402; 1809 u64 zero = 0; 1810 1811 msr_bmp_init(); 1812 asm volatile( 1813 "mov %0,%%dr0\n\t" 1814 "mov %0,%%dr1\n\t" 1815 "mov %0,%%dr2\n\t" 1816 "mov %1,%%dr7\n\t" 1817 : : "r" (zero), "r" (dr7)); 1818 wrmsr(MSR_IA32_DEBUGCTLMSR, 0x1); 1819 vmcs_write(GUEST_DR7, 0x404); 1820 vmcs_write(GUEST_DEBUGCTL, 0x2); 1821 1822 vmcs_write(ENT_CONTROLS, vmcs_read(ENT_CONTROLS) | ENT_LOAD_DBGCTLS); 1823 vmcs_write(EXI_CONTROLS, vmcs_read(EXI_CONTROLS) | EXI_SAVE_DBGCTLS); 1824 1825 return VMX_TEST_START; 1826 } 1827 1828 static void dbgctls_main(void) 1829 { 1830 u64 dr7, debugctl; 1831 1832 asm volatile("mov %%dr7,%0" : "=r" (dr7)); 1833 debugctl = rdmsr(MSR_IA32_DEBUGCTLMSR); 1834 /* Commented out: KVM does not support DEBUGCTL so far */ 1835 (void)debugctl; 1836 report(dr7 == 0x404, "Load debug controls" /* && debugctl == 0x2 */); 1837 1838 dr7 = 0x408; 1839 asm volatile("mov %0,%%dr7" : : "r" (dr7)); 1840 wrmsr(MSR_IA32_DEBUGCTLMSR, 0x3); 1841 1842 vmx_set_test_stage(0); 1843 vmcall(); 1844 report(vmx_get_test_stage() == 1, "Save debug controls"); 1845 1846 if (ctrl_enter_rev.set & ENT_LOAD_DBGCTLS || 1847 ctrl_exit_rev.set & EXI_SAVE_DBGCTLS) { 1848 printf("\tDebug controls are always loaded/saved\n"); 1849 return; 1850 } 1851 vmx_set_test_stage(2); 1852 vmcall(); 1853 1854 asm volatile("mov %%dr7,%0" : "=r" (dr7)); 1855 debugctl = rdmsr(MSR_IA32_DEBUGCTLMSR); 1856 /* Commented out: KVM does not support DEBUGCTL so far */ 1857 (void)debugctl; 1858 report(dr7 == 0x402, 1859 "Guest=host debug controls" /* && debugctl == 0x1 */); 1860 1861 dr7 = 0x408; 1862 asm volatile("mov %0,%%dr7" : : "r" (dr7)); 1863 wrmsr(MSR_IA32_DEBUGCTLMSR, 0x3); 1864 1865 vmx_set_test_stage(3); 1866 vmcall(); 1867 report(vmx_get_test_stage() == 4, "Don't save debug controls"); 1868 } 1869 1870 static int dbgctls_exit_handler(union exit_reason exit_reason) 1871 { 1872 u32 insn_len = vmcs_read(EXI_INST_LEN); 1873 u64 guest_rip = vmcs_read(GUEST_RIP); 1874 u64 dr7, debugctl; 1875 1876 asm volatile("mov %%dr7,%0" : "=r" (dr7)); 1877 debugctl = rdmsr(MSR_IA32_DEBUGCTLMSR); 1878 1879 switch (exit_reason.basic) { 1880 case VMX_VMCALL: 1881 switch (vmx_get_test_stage()) { 1882 case 0: 1883 if (dr7 == 0x400 && debugctl == 0 && 1884 vmcs_read(GUEST_DR7) == 0x408 /* && 1885 Commented out: KVM does not support DEBUGCTL so far 1886 vmcs_read(GUEST_DEBUGCTL) == 0x3 */) 1887 vmx_inc_test_stage(); 1888 break; 1889 case 2: 1890 dr7 = 0x402; 1891 asm volatile("mov %0,%%dr7" : : "r" (dr7)); 1892 wrmsr(MSR_IA32_DEBUGCTLMSR, 0x1); 1893 vmcs_write(GUEST_DR7, 0x404); 1894 vmcs_write(GUEST_DEBUGCTL, 0x2); 1895 1896 vmcs_write(ENT_CONTROLS, 1897 vmcs_read(ENT_CONTROLS) & ~ENT_LOAD_DBGCTLS); 1898 vmcs_write(EXI_CONTROLS, 1899 vmcs_read(EXI_CONTROLS) & ~EXI_SAVE_DBGCTLS); 1900 break; 1901 case 3: 1902 if (dr7 == 0x400 && debugctl == 0 && 1903 vmcs_read(GUEST_DR7) == 0x404 /* && 1904 Commented out: KVM does not support DEBUGCTL so far 1905 vmcs_read(GUEST_DEBUGCTL) == 0x2 */) 1906 vmx_inc_test_stage(); 1907 break; 1908 } 1909 vmcs_write(GUEST_RIP, guest_rip + insn_len); 1910 return VMX_TEST_RESUME; 1911 default: 1912 report(false, "Unknown exit reason, %d", exit_reason.full); 1913 print_vmexit_info(exit_reason); 1914 } 1915 return VMX_TEST_VMEXIT; 1916 } 1917 1918 struct vmx_msr_entry { 1919 u32 index; 1920 u32 reserved; 1921 u64 value; 1922 } __attribute__((packed)); 1923 1924 #define MSR_MAGIC 0x31415926 1925 struct vmx_msr_entry *exit_msr_store, *entry_msr_load, *exit_msr_load; 1926 1927 static int msr_switch_init(struct vmcs *vmcs) 1928 { 1929 msr_bmp_init(); 1930 exit_msr_store = alloc_page(); 1931 exit_msr_load = alloc_page(); 1932 entry_msr_load = alloc_page(); 1933 entry_msr_load[0].index = MSR_KERNEL_GS_BASE; 1934 entry_msr_load[0].value = MSR_MAGIC; 1935 1936 vmx_set_test_stage(1); 1937 vmcs_write(ENT_MSR_LD_CNT, 1); 1938 vmcs_write(ENTER_MSR_LD_ADDR, (u64)entry_msr_load); 1939 vmcs_write(EXI_MSR_ST_CNT, 1); 1940 vmcs_write(EXIT_MSR_ST_ADDR, (u64)exit_msr_store); 1941 vmcs_write(EXI_MSR_LD_CNT, 1); 1942 vmcs_write(EXIT_MSR_LD_ADDR, (u64)exit_msr_load); 1943 return VMX_TEST_START; 1944 } 1945 1946 static void msr_switch_main(void) 1947 { 1948 if (vmx_get_test_stage() == 1) { 1949 report(rdmsr(MSR_KERNEL_GS_BASE) == MSR_MAGIC, 1950 "VM entry MSR load"); 1951 vmx_set_test_stage(2); 1952 wrmsr(MSR_KERNEL_GS_BASE, MSR_MAGIC + 1); 1953 exit_msr_store[0].index = MSR_KERNEL_GS_BASE; 1954 exit_msr_load[0].index = MSR_KERNEL_GS_BASE; 1955 exit_msr_load[0].value = MSR_MAGIC + 2; 1956 } 1957 vmcall(); 1958 } 1959 1960 static int msr_switch_exit_handler(union exit_reason exit_reason) 1961 { 1962 if (exit_reason.basic == VMX_VMCALL && vmx_get_test_stage() == 2) { 1963 report(exit_msr_store[0].value == MSR_MAGIC + 1, 1964 "VM exit MSR store"); 1965 report(rdmsr(MSR_KERNEL_GS_BASE) == MSR_MAGIC + 2, 1966 "VM exit MSR load"); 1967 vmx_set_test_stage(3); 1968 entry_msr_load[0].index = MSR_FS_BASE; 1969 return VMX_TEST_RESUME; 1970 } 1971 printf("ERROR %s: unexpected stage=%u or reason=0x%x\n", 1972 __func__, vmx_get_test_stage(), exit_reason.full); 1973 return VMX_TEST_EXIT; 1974 } 1975 1976 static int msr_switch_entry_failure(struct vmentry_result *result) 1977 { 1978 if (result->vm_fail) { 1979 printf("ERROR %s: VM-Fail on %s\n", __func__, result->instr); 1980 return VMX_TEST_EXIT; 1981 } 1982 1983 if (result->exit_reason.failed_vmentry && 1984 result->exit_reason.basic == VMX_FAIL_MSR && 1985 vmx_get_test_stage() == 3) { 1986 report(vmcs_read(EXI_QUALIFICATION) == 1, 1987 "VM entry MSR load: try to load FS_BASE"); 1988 return VMX_TEST_VMEXIT; 1989 } 1990 printf("ERROR %s: unexpected stage=%u or reason=%x\n", 1991 __func__, vmx_get_test_stage(), result->exit_reason.full); 1992 return VMX_TEST_EXIT; 1993 } 1994 1995 static int vmmcall_init(struct vmcs *vmcs) 1996 { 1997 vmcs_write(EXC_BITMAP, 1 << UD_VECTOR); 1998 return VMX_TEST_START; 1999 } 2000 2001 static void vmmcall_main(void) 2002 { 2003 asm volatile( 2004 "mov $0xABCD, %%rax\n\t" 2005 "vmmcall\n\t" 2006 ::: "rax"); 2007 2008 report(0, "VMMCALL"); 2009 } 2010 2011 static int vmmcall_exit_handler(union exit_reason exit_reason) 2012 { 2013 switch (exit_reason.basic) { 2014 case VMX_VMCALL: 2015 printf("here\n"); 2016 report(0, "VMMCALL triggers #UD"); 2017 break; 2018 case VMX_EXC_NMI: 2019 report((vmcs_read(EXI_INTR_INFO) & 0xff) == UD_VECTOR, 2020 "VMMCALL triggers #UD"); 2021 break; 2022 default: 2023 report(false, "Unknown exit reason, 0x%x", exit_reason.full); 2024 print_vmexit_info(exit_reason); 2025 } 2026 2027 return VMX_TEST_VMEXIT; 2028 } 2029 2030 static int disable_rdtscp_init(struct vmcs *vmcs) 2031 { 2032 u32 ctrl_cpu1; 2033 2034 if (ctrl_cpu_rev[0].clr & CPU_SECONDARY) { 2035 ctrl_cpu1 = vmcs_read(CPU_EXEC_CTRL1); 2036 ctrl_cpu1 &= ~CPU_RDTSCP; 2037 vmcs_write(CPU_EXEC_CTRL1, ctrl_cpu1); 2038 } 2039 2040 return VMX_TEST_START; 2041 } 2042 2043 static void disable_rdtscp_ud_handler(struct ex_regs *regs) 2044 { 2045 switch (vmx_get_test_stage()) { 2046 case 0: 2047 report(true, "RDTSCP triggers #UD"); 2048 vmx_inc_test_stage(); 2049 regs->rip += 3; 2050 break; 2051 case 2: 2052 report(true, "RDPID triggers #UD"); 2053 vmx_inc_test_stage(); 2054 regs->rip += 4; 2055 break; 2056 } 2057 return; 2058 2059 } 2060 2061 static void disable_rdtscp_main(void) 2062 { 2063 /* Test that #UD is properly injected in L2. */ 2064 handle_exception(UD_VECTOR, disable_rdtscp_ud_handler); 2065 2066 vmx_set_test_stage(0); 2067 asm volatile("rdtscp" : : : "eax", "ecx", "edx"); 2068 vmcall(); 2069 asm volatile(".byte 0xf3, 0x0f, 0xc7, 0xf8" : : : "eax"); 2070 2071 handle_exception(UD_VECTOR, 0); 2072 vmcall(); 2073 } 2074 2075 static int disable_rdtscp_exit_handler(union exit_reason exit_reason) 2076 { 2077 switch (exit_reason.basic) { 2078 case VMX_VMCALL: 2079 switch (vmx_get_test_stage()) { 2080 case 0: 2081 report(false, "RDTSCP triggers #UD"); 2082 vmx_inc_test_stage(); 2083 /* fallthrough */ 2084 case 1: 2085 vmx_inc_test_stage(); 2086 vmcs_write(GUEST_RIP, vmcs_read(GUEST_RIP) + 3); 2087 return VMX_TEST_RESUME; 2088 case 2: 2089 report(false, "RDPID triggers #UD"); 2090 break; 2091 } 2092 break; 2093 2094 default: 2095 report(false, "Unknown exit reason, 0x%x", exit_reason.full); 2096 print_vmexit_info(exit_reason); 2097 } 2098 return VMX_TEST_VMEXIT; 2099 } 2100 2101 static int int3_init(struct vmcs *vmcs) 2102 { 2103 vmcs_write(EXC_BITMAP, ~0u); 2104 return VMX_TEST_START; 2105 } 2106 2107 static void int3_guest_main(void) 2108 { 2109 asm volatile ("int3"); 2110 } 2111 2112 static int int3_exit_handler(union exit_reason exit_reason) 2113 { 2114 u32 intr_info = vmcs_read(EXI_INTR_INFO); 2115 2116 report(exit_reason.basic == VMX_EXC_NMI && 2117 (intr_info & INTR_INFO_VALID_MASK) && 2118 (intr_info & INTR_INFO_VECTOR_MASK) == BP_VECTOR && 2119 ((intr_info & INTR_INFO_INTR_TYPE_MASK) >> 2120 INTR_INFO_INTR_TYPE_SHIFT) == VMX_INTR_TYPE_SOFT_EXCEPTION, 2121 "L1 intercepts #BP"); 2122 2123 return VMX_TEST_VMEXIT; 2124 } 2125 2126 static int into_init(struct vmcs *vmcs) 2127 { 2128 vmcs_write(EXC_BITMAP, ~0u); 2129 return VMX_TEST_START; 2130 } 2131 2132 static void into_guest_main(void) 2133 { 2134 struct far_pointer32 fp = { 2135 .offset = (uintptr_t)&&into, 2136 .selector = KERNEL_CS32, 2137 }; 2138 register uintptr_t rsp asm("rsp"); 2139 2140 if (fp.offset != (uintptr_t)&&into) { 2141 printf("Code address too high.\n"); 2142 return; 2143 } 2144 if ((u32)rsp != rsp) { 2145 printf("Stack address too high.\n"); 2146 return; 2147 } 2148 2149 asm goto ("lcall *%0" : : "m" (fp) : "rax" : into); 2150 return; 2151 into: 2152 asm volatile (".code32;" 2153 "movl $0x7fffffff, %eax;" 2154 "addl %eax, %eax;" 2155 "into;" 2156 "lret;" 2157 ".code64"); 2158 __builtin_unreachable(); 2159 } 2160 2161 static int into_exit_handler(union exit_reason exit_reason) 2162 { 2163 u32 intr_info = vmcs_read(EXI_INTR_INFO); 2164 2165 report(exit_reason.basic == VMX_EXC_NMI && 2166 (intr_info & INTR_INFO_VALID_MASK) && 2167 (intr_info & INTR_INFO_VECTOR_MASK) == OF_VECTOR && 2168 ((intr_info & INTR_INFO_INTR_TYPE_MASK) >> 2169 INTR_INFO_INTR_TYPE_SHIFT) == VMX_INTR_TYPE_SOFT_EXCEPTION, 2170 "L1 intercepts #OF"); 2171 2172 return VMX_TEST_VMEXIT; 2173 } 2174 2175 static void exit_monitor_from_l2_main(void) 2176 { 2177 printf("Calling exit(0) from l2...\n"); 2178 exit(0); 2179 } 2180 2181 static int exit_monitor_from_l2_handler(union exit_reason exit_reason) 2182 { 2183 report(false, "The guest should have killed the VMM"); 2184 return VMX_TEST_EXIT; 2185 } 2186 2187 static void assert_exit_reason(u64 expected) 2188 { 2189 u64 actual = vmcs_read(EXI_REASON); 2190 2191 TEST_ASSERT_EQ_MSG(expected, actual, "Expected %s, got %s.", 2192 exit_reason_description(expected), 2193 exit_reason_description(actual)); 2194 } 2195 2196 static void skip_exit_insn(void) 2197 { 2198 u64 guest_rip = vmcs_read(GUEST_RIP); 2199 u32 insn_len = vmcs_read(EXI_INST_LEN); 2200 vmcs_write(GUEST_RIP, guest_rip + insn_len); 2201 } 2202 2203 static void skip_exit_vmcall(void) 2204 { 2205 assert_exit_reason(VMX_VMCALL); 2206 skip_exit_insn(); 2207 } 2208 2209 static void v2_null_test_guest(void) 2210 { 2211 } 2212 2213 static void v2_null_test(void) 2214 { 2215 test_set_guest(v2_null_test_guest); 2216 enter_guest(); 2217 report(1, __func__); 2218 } 2219 2220 static void v2_multiple_entries_test_guest(void) 2221 { 2222 vmx_set_test_stage(1); 2223 vmcall(); 2224 vmx_set_test_stage(2); 2225 } 2226 2227 static void v2_multiple_entries_test(void) 2228 { 2229 test_set_guest(v2_multiple_entries_test_guest); 2230 enter_guest(); 2231 TEST_ASSERT_EQ(vmx_get_test_stage(), 1); 2232 skip_exit_vmcall(); 2233 enter_guest(); 2234 TEST_ASSERT_EQ(vmx_get_test_stage(), 2); 2235 report(1, __func__); 2236 } 2237 2238 static int fixture_test_data = 1; 2239 2240 static void fixture_test_teardown(void *data) 2241 { 2242 *((int *) data) = 1; 2243 } 2244 2245 static void fixture_test_guest(void) 2246 { 2247 fixture_test_data++; 2248 } 2249 2250 2251 static void fixture_test_setup(void) 2252 { 2253 TEST_ASSERT_EQ_MSG(1, fixture_test_data, 2254 "fixture_test_teardown didn't run?!"); 2255 fixture_test_data = 2; 2256 test_add_teardown(fixture_test_teardown, &fixture_test_data); 2257 test_set_guest(fixture_test_guest); 2258 } 2259 2260 static void fixture_test_case1(void) 2261 { 2262 fixture_test_setup(); 2263 TEST_ASSERT_EQ(2, fixture_test_data); 2264 enter_guest(); 2265 TEST_ASSERT_EQ(3, fixture_test_data); 2266 report(1, __func__); 2267 } 2268 2269 static void fixture_test_case2(void) 2270 { 2271 fixture_test_setup(); 2272 TEST_ASSERT_EQ(2, fixture_test_data); 2273 enter_guest(); 2274 TEST_ASSERT_EQ(3, fixture_test_data); 2275 report(1, __func__); 2276 } 2277 2278 enum ept_access_op { 2279 OP_READ, 2280 OP_WRITE, 2281 OP_EXEC, 2282 OP_FLUSH_TLB, 2283 OP_EXIT, 2284 }; 2285 2286 static struct ept_access_test_data { 2287 unsigned long gpa; 2288 unsigned long *gva; 2289 unsigned long hpa; 2290 unsigned long *hva; 2291 enum ept_access_op op; 2292 } ept_access_test_data; 2293 2294 extern unsigned char ret42_start; 2295 extern unsigned char ret42_end; 2296 2297 /* Returns 42. */ 2298 asm( 2299 ".align 64\n" 2300 "ret42_start:\n" 2301 "mov $42, %eax\n" 2302 "ret\n" 2303 "ret42_end:\n" 2304 ); 2305 2306 static void 2307 diagnose_ept_violation_qual(u64 expected, u64 actual) 2308 { 2309 2310 #define DIAGNOSE(flag) \ 2311 do { \ 2312 if ((expected & flag) != (actual & flag)) \ 2313 printf(#flag " %sexpected\n", \ 2314 (expected & flag) ? "" : "un"); \ 2315 } while (0) 2316 2317 DIAGNOSE(EPT_VLT_RD); 2318 DIAGNOSE(EPT_VLT_WR); 2319 DIAGNOSE(EPT_VLT_FETCH); 2320 DIAGNOSE(EPT_VLT_PERM_RD); 2321 DIAGNOSE(EPT_VLT_PERM_WR); 2322 DIAGNOSE(EPT_VLT_PERM_EX); 2323 DIAGNOSE(EPT_VLT_LADDR_VLD); 2324 DIAGNOSE(EPT_VLT_PADDR); 2325 2326 #undef DIAGNOSE 2327 } 2328 2329 static void do_ept_access_op(enum ept_access_op op) 2330 { 2331 ept_access_test_data.op = op; 2332 enter_guest(); 2333 } 2334 2335 /* 2336 * Force the guest to flush its TLB (i.e., flush gva -> gpa mappings). Only 2337 * needed by tests that modify guest PTEs. 2338 */ 2339 static void ept_access_test_guest_flush_tlb(void) 2340 { 2341 do_ept_access_op(OP_FLUSH_TLB); 2342 skip_exit_vmcall(); 2343 } 2344 2345 /* 2346 * Modifies the EPT entry at @level in the mapping of @gpa. First clears the 2347 * bits in @clear then sets the bits in @set. @mkhuge transforms the entry into 2348 * a huge page. 2349 */ 2350 static unsigned long ept_twiddle(unsigned long gpa, bool mkhuge, int level, 2351 unsigned long clear, unsigned long set) 2352 { 2353 struct ept_access_test_data *data = &ept_access_test_data; 2354 unsigned long orig_pte; 2355 unsigned long pte; 2356 2357 /* Screw with the mapping at the requested level. */ 2358 TEST_ASSERT(get_ept_pte(pml4, gpa, level, &orig_pte)); 2359 pte = orig_pte; 2360 if (mkhuge) 2361 pte = (orig_pte & ~EPT_ADDR_MASK) | data->hpa | EPT_LARGE_PAGE; 2362 else 2363 pte = orig_pte; 2364 pte = (pte & ~clear) | set; 2365 set_ept_pte(pml4, gpa, level, pte); 2366 ept_sync(INVEPT_SINGLE, eptp); 2367 2368 return orig_pte; 2369 } 2370 2371 static void ept_untwiddle(unsigned long gpa, int level, unsigned long orig_pte) 2372 { 2373 set_ept_pte(pml4, gpa, level, orig_pte); 2374 ept_sync(INVEPT_SINGLE, eptp); 2375 } 2376 2377 static void do_ept_violation(bool leaf, enum ept_access_op op, 2378 u64 expected_qual, u64 expected_paddr) 2379 { 2380 u64 qual; 2381 2382 /* Try the access and observe the violation. */ 2383 do_ept_access_op(op); 2384 2385 assert_exit_reason(VMX_EPT_VIOLATION); 2386 2387 qual = vmcs_read(EXI_QUALIFICATION); 2388 2389 /* Mask undefined bits (which may later be defined in certain cases). */ 2390 qual &= ~(EPT_VLT_GUEST_USER | EPT_VLT_GUEST_RW | EPT_VLT_GUEST_EX | 2391 EPT_VLT_PERM_USER_EX); 2392 2393 diagnose_ept_violation_qual(expected_qual, qual); 2394 TEST_EXPECT_EQ(expected_qual, qual); 2395 2396 #if 0 2397 /* Disable for now otherwise every test will fail */ 2398 TEST_EXPECT_EQ(vmcs_read(GUEST_LINEAR_ADDRESS), 2399 (unsigned long) ( 2400 op == OP_EXEC ? data->gva + 1 : data->gva)); 2401 #endif 2402 /* 2403 * TODO: tests that probe expected_paddr in pages other than the one at 2404 * the beginning of the 1g region. 2405 */ 2406 TEST_EXPECT_EQ(vmcs_read(INFO_PHYS_ADDR), expected_paddr); 2407 } 2408 2409 static void 2410 ept_violation_at_level_mkhuge(bool mkhuge, int level, unsigned long clear, 2411 unsigned long set, enum ept_access_op op, 2412 u64 expected_qual) 2413 { 2414 struct ept_access_test_data *data = &ept_access_test_data; 2415 unsigned long orig_pte; 2416 2417 orig_pte = ept_twiddle(data->gpa, mkhuge, level, clear, set); 2418 2419 do_ept_violation(level == 1 || mkhuge, op, expected_qual, 2420 op == OP_EXEC ? data->gpa + sizeof(unsigned long) : 2421 data->gpa); 2422 2423 /* Fix the violation and resume the op loop. */ 2424 ept_untwiddle(data->gpa, level, orig_pte); 2425 enter_guest(); 2426 skip_exit_vmcall(); 2427 } 2428 2429 static void 2430 ept_violation_at_level(int level, unsigned long clear, unsigned long set, 2431 enum ept_access_op op, u64 expected_qual) 2432 { 2433 ept_violation_at_level_mkhuge(false, level, clear, set, op, 2434 expected_qual); 2435 if (ept_huge_pages_supported(level)) 2436 ept_violation_at_level_mkhuge(true, level, clear, set, op, 2437 expected_qual); 2438 } 2439 2440 static void ept_violation(unsigned long clear, unsigned long set, 2441 enum ept_access_op op, u64 expected_qual) 2442 { 2443 ept_violation_at_level(1, clear, set, op, expected_qual); 2444 ept_violation_at_level(2, clear, set, op, expected_qual); 2445 ept_violation_at_level(3, clear, set, op, expected_qual); 2446 ept_violation_at_level(4, clear, set, op, expected_qual); 2447 } 2448 2449 static void ept_access_violation(unsigned long access, enum ept_access_op op, 2450 u64 expected_qual) 2451 { 2452 ept_violation(EPT_PRESENT, access, op, 2453 expected_qual | EPT_VLT_LADDR_VLD | EPT_VLT_PADDR); 2454 } 2455 2456 /* 2457 * For translations that don't involve a GVA, that is physical address (paddr) 2458 * accesses, EPT violations don't set the flag EPT_VLT_PADDR. For a typical 2459 * guest memory access, the hardware does GVA -> GPA -> HPA. However, certain 2460 * translations don't involve GVAs, such as when the hardware does the guest 2461 * page table walk. For example, in translating GVA_1 -> GPA_1, the guest MMU 2462 * might try to set an A bit on a guest PTE. If the GPA_2 that the PTE resides 2463 * on isn't present in the EPT, then the EPT violation will be for GPA_2 and 2464 * the EPT_VLT_PADDR bit will be clear in the exit qualification. 2465 * 2466 * Note that paddr violations can also be triggered by loading PAE page tables 2467 * with wonky addresses. We don't test that yet. 2468 * 2469 * This function modifies the EPT entry that maps the GPA that the guest page 2470 * table entry mapping ept_access_test_data.gva resides on. 2471 * 2472 * @ept_access EPT permissions to set. Other permissions are cleared. 2473 * 2474 * @pte_ad Set the A/D bits on the guest PTE accordingly. 2475 * 2476 * @op Guest operation to perform with 2477 * ept_access_test_data.gva. 2478 * 2479 * @expect_violation 2480 * Is a violation expected during the paddr access? 2481 * 2482 * @expected_qual Expected qualification for the EPT violation. 2483 * EPT_VLT_PADDR should be clear. 2484 */ 2485 static void ept_access_paddr(unsigned long ept_access, unsigned long pte_ad, 2486 enum ept_access_op op, bool expect_violation, 2487 u64 expected_qual) 2488 { 2489 struct ept_access_test_data *data = &ept_access_test_data; 2490 unsigned long *ptep; 2491 unsigned long gpa; 2492 unsigned long orig_epte; 2493 unsigned long epte; 2494 int i; 2495 2496 /* Modify the guest PTE mapping data->gva according to @pte_ad. */ 2497 ptep = get_pte_level(current_page_table(), data->gva, /*level=*/1); 2498 TEST_ASSERT(ptep); 2499 TEST_ASSERT_EQ(*ptep & PT_ADDR_MASK, data->gpa); 2500 *ptep = (*ptep & ~PT_AD_MASK) | pte_ad; 2501 ept_access_test_guest_flush_tlb(); 2502 2503 /* 2504 * Now modify the access bits on the EPT entry for the GPA that the 2505 * guest PTE resides on. Note that by modifying a single EPT entry, 2506 * we're potentially affecting 512 guest PTEs. However, we've carefully 2507 * constructed our test such that those other 511 PTEs aren't used by 2508 * the guest: data->gva is at the beginning of a 1G huge page, thus the 2509 * PTE we're modifying is at the beginning of a 4K page and the 2510 * following 511 entires are also under our control (and not touched by 2511 * the guest). 2512 */ 2513 gpa = virt_to_phys(ptep); 2514 TEST_ASSERT_EQ(gpa & ~PAGE_MASK, 0); 2515 /* 2516 * Make sure the guest page table page is mapped with a 4K EPT entry, 2517 * otherwise our level=1 twiddling below will fail. We use the 2518 * identity map (gpa = gpa) since page tables are shared with the host. 2519 */ 2520 install_ept(pml4, gpa, gpa, EPT_PRESENT); 2521 orig_epte = ept_twiddle(gpa, /*mkhuge=*/0, /*level=*/1, 2522 /*clear=*/EPT_PRESENT, /*set=*/ept_access); 2523 2524 if (expect_violation) { 2525 do_ept_violation(/*leaf=*/true, op, 2526 expected_qual | EPT_VLT_LADDR_VLD, gpa); 2527 ept_untwiddle(gpa, /*level=*/1, orig_epte); 2528 do_ept_access_op(op); 2529 } else { 2530 do_ept_access_op(op); 2531 if (ept_ad_enabled()) { 2532 for (i = EPT_PAGE_LEVEL; i > 0; i--) { 2533 TEST_ASSERT(get_ept_pte(pml4, gpa, i, &epte)); 2534 TEST_ASSERT(epte & EPT_ACCESS_FLAG); 2535 if (i == 1) 2536 TEST_ASSERT(epte & EPT_DIRTY_FLAG); 2537 else 2538 TEST_ASSERT_EQ(epte & EPT_DIRTY_FLAG, 0); 2539 } 2540 } 2541 2542 ept_untwiddle(gpa, /*level=*/1, orig_epte); 2543 } 2544 2545 TEST_ASSERT(*ptep & PT_ACCESSED_MASK); 2546 if ((pte_ad & PT_DIRTY_MASK) || op == OP_WRITE) 2547 TEST_ASSERT(*ptep & PT_DIRTY_MASK); 2548 2549 skip_exit_vmcall(); 2550 } 2551 2552 static void ept_access_allowed_paddr(unsigned long ept_access, 2553 unsigned long pte_ad, 2554 enum ept_access_op op) 2555 { 2556 ept_access_paddr(ept_access, pte_ad, op, /*expect_violation=*/false, 2557 /*expected_qual=*/-1); 2558 } 2559 2560 static void ept_access_violation_paddr(unsigned long ept_access, 2561 unsigned long pte_ad, 2562 enum ept_access_op op, 2563 u64 expected_qual) 2564 { 2565 ept_access_paddr(ept_access, pte_ad, op, /*expect_violation=*/true, 2566 expected_qual); 2567 } 2568 2569 2570 static void ept_allowed_at_level_mkhuge(bool mkhuge, int level, 2571 unsigned long clear, 2572 unsigned long set, 2573 enum ept_access_op op) 2574 { 2575 struct ept_access_test_data *data = &ept_access_test_data; 2576 unsigned long orig_pte; 2577 2578 orig_pte = ept_twiddle(data->gpa, mkhuge, level, clear, set); 2579 2580 /* No violation. Should proceed to vmcall. */ 2581 do_ept_access_op(op); 2582 skip_exit_vmcall(); 2583 2584 ept_untwiddle(data->gpa, level, orig_pte); 2585 } 2586 2587 static void ept_allowed_at_level(int level, unsigned long clear, 2588 unsigned long set, enum ept_access_op op) 2589 { 2590 ept_allowed_at_level_mkhuge(false, level, clear, set, op); 2591 if (ept_huge_pages_supported(level)) 2592 ept_allowed_at_level_mkhuge(true, level, clear, set, op); 2593 } 2594 2595 static void ept_allowed(unsigned long clear, unsigned long set, 2596 enum ept_access_op op) 2597 { 2598 ept_allowed_at_level(1, clear, set, op); 2599 ept_allowed_at_level(2, clear, set, op); 2600 ept_allowed_at_level(3, clear, set, op); 2601 ept_allowed_at_level(4, clear, set, op); 2602 } 2603 2604 static void ept_ignored_bit(int bit) 2605 { 2606 /* Set the bit. */ 2607 ept_allowed(0, 1ul << bit, OP_READ); 2608 ept_allowed(0, 1ul << bit, OP_WRITE); 2609 ept_allowed(0, 1ul << bit, OP_EXEC); 2610 2611 /* Clear the bit. */ 2612 ept_allowed(1ul << bit, 0, OP_READ); 2613 ept_allowed(1ul << bit, 0, OP_WRITE); 2614 ept_allowed(1ul << bit, 0, OP_EXEC); 2615 } 2616 2617 static void ept_access_allowed(unsigned long access, enum ept_access_op op) 2618 { 2619 ept_allowed(EPT_PRESENT, access, op); 2620 } 2621 2622 2623 static void ept_misconfig_at_level_mkhuge_op(bool mkhuge, int level, 2624 unsigned long clear, 2625 unsigned long set, 2626 enum ept_access_op op) 2627 { 2628 struct ept_access_test_data *data = &ept_access_test_data; 2629 unsigned long orig_pte; 2630 2631 orig_pte = ept_twiddle(data->gpa, mkhuge, level, clear, set); 2632 2633 do_ept_access_op(op); 2634 assert_exit_reason(VMX_EPT_MISCONFIG); 2635 2636 /* Intel 27.2.1, "For all other VM exits, this field is cleared." */ 2637 #if 0 2638 /* broken: */ 2639 TEST_EXPECT_EQ_MSG(vmcs_read(EXI_QUALIFICATION), 0); 2640 #endif 2641 #if 0 2642 /* 2643 * broken: 2644 * According to description of exit qual for EPT violation, 2645 * EPT_VLT_LADDR_VLD indicates if GUEST_LINEAR_ADDRESS is valid. 2646 * However, I can't find anything that says GUEST_LINEAR_ADDRESS ought 2647 * to be set for msiconfig. 2648 */ 2649 TEST_EXPECT_EQ(vmcs_read(GUEST_LINEAR_ADDRESS), 2650 (unsigned long) ( 2651 op == OP_EXEC ? data->gva + 1 : data->gva)); 2652 #endif 2653 2654 /* Fix the violation and resume the op loop. */ 2655 ept_untwiddle(data->gpa, level, orig_pte); 2656 enter_guest(); 2657 skip_exit_vmcall(); 2658 } 2659 2660 static void ept_misconfig_at_level_mkhuge(bool mkhuge, int level, 2661 unsigned long clear, 2662 unsigned long set) 2663 { 2664 /* The op shouldn't matter (read, write, exec), so try them all! */ 2665 ept_misconfig_at_level_mkhuge_op(mkhuge, level, clear, set, OP_READ); 2666 ept_misconfig_at_level_mkhuge_op(mkhuge, level, clear, set, OP_WRITE); 2667 ept_misconfig_at_level_mkhuge_op(mkhuge, level, clear, set, OP_EXEC); 2668 } 2669 2670 static void ept_misconfig_at_level(int level, unsigned long clear, 2671 unsigned long set) 2672 { 2673 ept_misconfig_at_level_mkhuge(false, level, clear, set); 2674 if (ept_huge_pages_supported(level)) 2675 ept_misconfig_at_level_mkhuge(true, level, clear, set); 2676 } 2677 2678 static void ept_misconfig(unsigned long clear, unsigned long set) 2679 { 2680 ept_misconfig_at_level(1, clear, set); 2681 ept_misconfig_at_level(2, clear, set); 2682 ept_misconfig_at_level(3, clear, set); 2683 ept_misconfig_at_level(4, clear, set); 2684 } 2685 2686 static void ept_access_misconfig(unsigned long access) 2687 { 2688 ept_misconfig(EPT_PRESENT, access); 2689 } 2690 2691 static void ept_reserved_bit_at_level_nohuge(int level, int bit) 2692 { 2693 /* Setting the bit causes a misconfig. */ 2694 ept_misconfig_at_level_mkhuge(false, level, 0, 1ul << bit); 2695 2696 /* Making the entry non-present turns reserved bits into ignored. */ 2697 ept_violation_at_level(level, EPT_PRESENT, 1ul << bit, OP_READ, 2698 EPT_VLT_RD | EPT_VLT_LADDR_VLD | EPT_VLT_PADDR); 2699 } 2700 2701 static void ept_reserved_bit_at_level_huge(int level, int bit) 2702 { 2703 /* Setting the bit causes a misconfig. */ 2704 ept_misconfig_at_level_mkhuge(true, level, 0, 1ul << bit); 2705 2706 /* Making the entry non-present turns reserved bits into ignored. */ 2707 ept_violation_at_level(level, EPT_PRESENT, 1ul << bit, OP_READ, 2708 EPT_VLT_RD | EPT_VLT_LADDR_VLD | EPT_VLT_PADDR); 2709 } 2710 2711 static void ept_reserved_bit_at_level(int level, int bit) 2712 { 2713 /* Setting the bit causes a misconfig. */ 2714 ept_misconfig_at_level(level, 0, 1ul << bit); 2715 2716 /* Making the entry non-present turns reserved bits into ignored. */ 2717 ept_violation_at_level(level, EPT_PRESENT, 1ul << bit, OP_READ, 2718 EPT_VLT_RD | EPT_VLT_LADDR_VLD | EPT_VLT_PADDR); 2719 } 2720 2721 static void ept_reserved_bit(int bit) 2722 { 2723 ept_reserved_bit_at_level(1, bit); 2724 ept_reserved_bit_at_level(2, bit); 2725 ept_reserved_bit_at_level(3, bit); 2726 ept_reserved_bit_at_level(4, bit); 2727 } 2728 2729 #define PAGE_2M_ORDER 9 2730 #define PAGE_1G_ORDER 18 2731 2732 static void *get_1g_page(void) 2733 { 2734 static void *alloc; 2735 2736 if (!alloc) 2737 alloc = alloc_pages(PAGE_1G_ORDER); 2738 return alloc; 2739 } 2740 2741 static void ept_access_test_teardown(void *unused) 2742 { 2743 /* Exit the guest cleanly. */ 2744 do_ept_access_op(OP_EXIT); 2745 } 2746 2747 static void ept_access_test_guest(void) 2748 { 2749 struct ept_access_test_data *data = &ept_access_test_data; 2750 int (*code)(void) = (int (*)(void)) &data->gva[1]; 2751 2752 while (true) { 2753 switch (data->op) { 2754 case OP_READ: 2755 TEST_ASSERT_EQ(*data->gva, MAGIC_VAL_1); 2756 break; 2757 case OP_WRITE: 2758 *data->gva = MAGIC_VAL_2; 2759 TEST_ASSERT_EQ(*data->gva, MAGIC_VAL_2); 2760 *data->gva = MAGIC_VAL_1; 2761 break; 2762 case OP_EXEC: 2763 TEST_ASSERT_EQ(42, code()); 2764 break; 2765 case OP_FLUSH_TLB: 2766 write_cr3(read_cr3()); 2767 break; 2768 case OP_EXIT: 2769 return; 2770 default: 2771 TEST_ASSERT_MSG(false, "Unknown op %d", data->op); 2772 } 2773 vmcall(); 2774 } 2775 } 2776 2777 static void ept_access_test_setup(void) 2778 { 2779 struct ept_access_test_data *data = &ept_access_test_data; 2780 unsigned long npages = 1ul << PAGE_1G_ORDER; 2781 unsigned long size = npages * PAGE_SIZE; 2782 unsigned long *page_table = current_page_table(); 2783 unsigned long pte; 2784 2785 if (setup_ept(false)) 2786 test_skip("EPT not supported"); 2787 2788 /* We use data->gpa = 1 << 39 so that test data has a separate pml4 entry */ 2789 if (cpuid_maxphyaddr() < 40) 2790 test_skip("Test needs MAXPHYADDR >= 40"); 2791 2792 test_set_guest(ept_access_test_guest); 2793 test_add_teardown(ept_access_test_teardown, NULL); 2794 2795 data->hva = get_1g_page(); 2796 TEST_ASSERT(data->hva); 2797 data->hpa = virt_to_phys(data->hva); 2798 2799 data->gpa = 1ul << 39; 2800 data->gva = (void *) ALIGN((unsigned long) alloc_vpages(npages * 2), 2801 size); 2802 TEST_ASSERT(!any_present_pages(page_table, data->gva, size)); 2803 install_pages(page_table, data->gpa, size, data->gva); 2804 2805 /* 2806 * Make sure nothing's mapped here so the tests that screw with the 2807 * pml4 entry don't inadvertently break something. 2808 */ 2809 TEST_ASSERT(get_ept_pte(pml4, data->gpa, 4, &pte) && pte == 0); 2810 TEST_ASSERT(get_ept_pte(pml4, data->gpa + size - 1, 4, &pte) && pte == 0); 2811 install_ept(pml4, data->hpa, data->gpa, EPT_PRESENT); 2812 2813 data->hva[0] = MAGIC_VAL_1; 2814 memcpy(&data->hva[1], &ret42_start, &ret42_end - &ret42_start); 2815 } 2816 2817 static void ept_access_test_not_present(void) 2818 { 2819 ept_access_test_setup(); 2820 /* --- */ 2821 ept_access_violation(0, OP_READ, EPT_VLT_RD); 2822 ept_access_violation(0, OP_WRITE, EPT_VLT_WR); 2823 ept_access_violation(0, OP_EXEC, EPT_VLT_FETCH); 2824 } 2825 2826 static void ept_access_test_read_only(void) 2827 { 2828 ept_access_test_setup(); 2829 2830 /* r-- */ 2831 ept_access_allowed(EPT_RA, OP_READ); 2832 ept_access_violation(EPT_RA, OP_WRITE, EPT_VLT_WR | EPT_VLT_PERM_RD); 2833 ept_access_violation(EPT_RA, OP_EXEC, EPT_VLT_FETCH | EPT_VLT_PERM_RD); 2834 } 2835 2836 static void ept_access_test_write_only(void) 2837 { 2838 ept_access_test_setup(); 2839 /* -w- */ 2840 ept_access_misconfig(EPT_WA); 2841 } 2842 2843 static void ept_access_test_read_write(void) 2844 { 2845 ept_access_test_setup(); 2846 /* rw- */ 2847 ept_access_allowed(EPT_RA | EPT_WA, OP_READ); 2848 ept_access_allowed(EPT_RA | EPT_WA, OP_WRITE); 2849 ept_access_violation(EPT_RA | EPT_WA, OP_EXEC, 2850 EPT_VLT_FETCH | EPT_VLT_PERM_RD | EPT_VLT_PERM_WR); 2851 } 2852 2853 2854 static void ept_access_test_execute_only(void) 2855 { 2856 ept_access_test_setup(); 2857 /* --x */ 2858 if (ept_execute_only_supported()) { 2859 ept_access_violation(EPT_EA, OP_READ, 2860 EPT_VLT_RD | EPT_VLT_PERM_EX); 2861 ept_access_violation(EPT_EA, OP_WRITE, 2862 EPT_VLT_WR | EPT_VLT_PERM_EX); 2863 ept_access_allowed(EPT_EA, OP_EXEC); 2864 } else { 2865 ept_access_misconfig(EPT_EA); 2866 } 2867 } 2868 2869 static void ept_access_test_read_execute(void) 2870 { 2871 ept_access_test_setup(); 2872 /* r-x */ 2873 ept_access_allowed(EPT_RA | EPT_EA, OP_READ); 2874 ept_access_violation(EPT_RA | EPT_EA, OP_WRITE, 2875 EPT_VLT_WR | EPT_VLT_PERM_RD | EPT_VLT_PERM_EX); 2876 ept_access_allowed(EPT_RA | EPT_EA, OP_EXEC); 2877 } 2878 2879 static void ept_access_test_write_execute(void) 2880 { 2881 ept_access_test_setup(); 2882 /* -wx */ 2883 ept_access_misconfig(EPT_WA | EPT_EA); 2884 } 2885 2886 static void ept_access_test_read_write_execute(void) 2887 { 2888 ept_access_test_setup(); 2889 /* rwx */ 2890 ept_access_allowed(EPT_RA | EPT_WA | EPT_EA, OP_READ); 2891 ept_access_allowed(EPT_RA | EPT_WA | EPT_EA, OP_WRITE); 2892 ept_access_allowed(EPT_RA | EPT_WA | EPT_EA, OP_EXEC); 2893 } 2894 2895 static void ept_access_test_reserved_bits(void) 2896 { 2897 int i; 2898 int maxphyaddr; 2899 2900 ept_access_test_setup(); 2901 2902 /* Reserved bits above maxphyaddr. */ 2903 maxphyaddr = cpuid_maxphyaddr(); 2904 for (i = maxphyaddr; i <= 51; i++) { 2905 report_prefix_pushf("reserved_bit=%d", i); 2906 ept_reserved_bit(i); 2907 report_prefix_pop(); 2908 } 2909 2910 /* Level-specific reserved bits. */ 2911 ept_reserved_bit_at_level_nohuge(2, 3); 2912 ept_reserved_bit_at_level_nohuge(2, 4); 2913 ept_reserved_bit_at_level_nohuge(2, 5); 2914 ept_reserved_bit_at_level_nohuge(2, 6); 2915 /* 2M alignment. */ 2916 for (i = 12; i < 20; i++) { 2917 report_prefix_pushf("reserved_bit=%d", i); 2918 ept_reserved_bit_at_level_huge(2, i); 2919 report_prefix_pop(); 2920 } 2921 ept_reserved_bit_at_level_nohuge(3, 3); 2922 ept_reserved_bit_at_level_nohuge(3, 4); 2923 ept_reserved_bit_at_level_nohuge(3, 5); 2924 ept_reserved_bit_at_level_nohuge(3, 6); 2925 /* 1G alignment. */ 2926 for (i = 12; i < 29; i++) { 2927 report_prefix_pushf("reserved_bit=%d", i); 2928 ept_reserved_bit_at_level_huge(3, i); 2929 report_prefix_pop(); 2930 } 2931 ept_reserved_bit_at_level(4, 3); 2932 ept_reserved_bit_at_level(4, 4); 2933 ept_reserved_bit_at_level(4, 5); 2934 ept_reserved_bit_at_level(4, 6); 2935 ept_reserved_bit_at_level(4, 7); 2936 } 2937 2938 static void ept_access_test_ignored_bits(void) 2939 { 2940 ept_access_test_setup(); 2941 /* 2942 * Bits ignored at every level. Bits 8 and 9 (A and D) are ignored as 2943 * far as translation is concerned even if AD bits are enabled in the 2944 * EPTP. Bit 63 is ignored because "EPT-violation #VE" VM-execution 2945 * control is 0. 2946 */ 2947 ept_ignored_bit(8); 2948 ept_ignored_bit(9); 2949 ept_ignored_bit(10); 2950 ept_ignored_bit(11); 2951 ept_ignored_bit(52); 2952 ept_ignored_bit(53); 2953 ept_ignored_bit(54); 2954 ept_ignored_bit(55); 2955 ept_ignored_bit(56); 2956 ept_ignored_bit(57); 2957 ept_ignored_bit(58); 2958 ept_ignored_bit(59); 2959 ept_ignored_bit(60); 2960 ept_ignored_bit(61); 2961 ept_ignored_bit(62); 2962 ept_ignored_bit(63); 2963 } 2964 2965 static void ept_access_test_paddr_not_present_ad_disabled(void) 2966 { 2967 ept_access_test_setup(); 2968 ept_disable_ad_bits(); 2969 2970 ept_access_violation_paddr(0, PT_AD_MASK, OP_READ, EPT_VLT_RD); 2971 ept_access_violation_paddr(0, PT_AD_MASK, OP_WRITE, EPT_VLT_RD); 2972 ept_access_violation_paddr(0, PT_AD_MASK, OP_EXEC, EPT_VLT_RD); 2973 } 2974 2975 static void ept_access_test_paddr_not_present_ad_enabled(void) 2976 { 2977 u64 qual = EPT_VLT_RD | EPT_VLT_WR; 2978 2979 ept_access_test_setup(); 2980 ept_enable_ad_bits_or_skip_test(); 2981 2982 ept_access_violation_paddr(0, PT_AD_MASK, OP_READ, qual); 2983 ept_access_violation_paddr(0, PT_AD_MASK, OP_WRITE, qual); 2984 ept_access_violation_paddr(0, PT_AD_MASK, OP_EXEC, qual); 2985 } 2986 2987 static void ept_access_test_paddr_read_only_ad_disabled(void) 2988 { 2989 /* 2990 * When EPT AD bits are disabled, all accesses to guest paging 2991 * structures are reported separately as a read and (after 2992 * translation of the GPA to host physical address) a read+write 2993 * if the A/D bits have to be set. 2994 */ 2995 u64 qual = EPT_VLT_WR | EPT_VLT_RD | EPT_VLT_PERM_RD; 2996 2997 ept_access_test_setup(); 2998 ept_disable_ad_bits(); 2999 3000 /* Can't update A bit, so all accesses fail. */ 3001 ept_access_violation_paddr(EPT_RA, 0, OP_READ, qual); 3002 ept_access_violation_paddr(EPT_RA, 0, OP_WRITE, qual); 3003 ept_access_violation_paddr(EPT_RA, 0, OP_EXEC, qual); 3004 /* AD bits disabled, so only writes try to update the D bit. */ 3005 ept_access_allowed_paddr(EPT_RA, PT_ACCESSED_MASK, OP_READ); 3006 ept_access_violation_paddr(EPT_RA, PT_ACCESSED_MASK, OP_WRITE, qual); 3007 ept_access_allowed_paddr(EPT_RA, PT_ACCESSED_MASK, OP_EXEC); 3008 /* Both A and D already set, so read-only is OK. */ 3009 ept_access_allowed_paddr(EPT_RA, PT_AD_MASK, OP_READ); 3010 ept_access_allowed_paddr(EPT_RA, PT_AD_MASK, OP_WRITE); 3011 ept_access_allowed_paddr(EPT_RA, PT_AD_MASK, OP_EXEC); 3012 } 3013 3014 static void ept_access_test_paddr_read_only_ad_enabled(void) 3015 { 3016 /* 3017 * When EPT AD bits are enabled, all accesses to guest paging 3018 * structures are considered writes as far as EPT translation 3019 * is concerned. 3020 */ 3021 u64 qual = EPT_VLT_WR | EPT_VLT_RD | EPT_VLT_PERM_RD; 3022 3023 ept_access_test_setup(); 3024 ept_enable_ad_bits_or_skip_test(); 3025 3026 ept_access_violation_paddr(EPT_RA, 0, OP_READ, qual); 3027 ept_access_violation_paddr(EPT_RA, 0, OP_WRITE, qual); 3028 ept_access_violation_paddr(EPT_RA, 0, OP_EXEC, qual); 3029 ept_access_violation_paddr(EPT_RA, PT_ACCESSED_MASK, OP_READ, qual); 3030 ept_access_violation_paddr(EPT_RA, PT_ACCESSED_MASK, OP_WRITE, qual); 3031 ept_access_violation_paddr(EPT_RA, PT_ACCESSED_MASK, OP_EXEC, qual); 3032 ept_access_violation_paddr(EPT_RA, PT_AD_MASK, OP_READ, qual); 3033 ept_access_violation_paddr(EPT_RA, PT_AD_MASK, OP_WRITE, qual); 3034 ept_access_violation_paddr(EPT_RA, PT_AD_MASK, OP_EXEC, qual); 3035 } 3036 3037 static void ept_access_test_paddr_read_write(void) 3038 { 3039 ept_access_test_setup(); 3040 /* Read-write access to paging structure. */ 3041 ept_access_allowed_paddr(EPT_RA | EPT_WA, 0, OP_READ); 3042 ept_access_allowed_paddr(EPT_RA | EPT_WA, 0, OP_WRITE); 3043 ept_access_allowed_paddr(EPT_RA | EPT_WA, 0, OP_EXEC); 3044 } 3045 3046 static void ept_access_test_paddr_read_write_execute(void) 3047 { 3048 ept_access_test_setup(); 3049 /* RWX access to paging structure. */ 3050 ept_access_allowed_paddr(EPT_PRESENT, 0, OP_READ); 3051 ept_access_allowed_paddr(EPT_PRESENT, 0, OP_WRITE); 3052 ept_access_allowed_paddr(EPT_PRESENT, 0, OP_EXEC); 3053 } 3054 3055 static void ept_access_test_paddr_read_execute_ad_disabled(void) 3056 { 3057 /* 3058 * When EPT AD bits are disabled, all accesses to guest paging 3059 * structures are reported separately as a read and (after 3060 * translation of the GPA to host physical address) a read+write 3061 * if the A/D bits have to be set. 3062 */ 3063 u64 qual = EPT_VLT_WR | EPT_VLT_RD | EPT_VLT_PERM_RD | EPT_VLT_PERM_EX; 3064 3065 ept_access_test_setup(); 3066 ept_disable_ad_bits(); 3067 3068 /* Can't update A bit, so all accesses fail. */ 3069 ept_access_violation_paddr(EPT_RA | EPT_EA, 0, OP_READ, qual); 3070 ept_access_violation_paddr(EPT_RA | EPT_EA, 0, OP_WRITE, qual); 3071 ept_access_violation_paddr(EPT_RA | EPT_EA, 0, OP_EXEC, qual); 3072 /* AD bits disabled, so only writes try to update the D bit. */ 3073 ept_access_allowed_paddr(EPT_RA | EPT_EA, PT_ACCESSED_MASK, OP_READ); 3074 ept_access_violation_paddr(EPT_RA | EPT_EA, PT_ACCESSED_MASK, OP_WRITE, qual); 3075 ept_access_allowed_paddr(EPT_RA | EPT_EA, PT_ACCESSED_MASK, OP_EXEC); 3076 /* Both A and D already set, so read-only is OK. */ 3077 ept_access_allowed_paddr(EPT_RA | EPT_EA, PT_AD_MASK, OP_READ); 3078 ept_access_allowed_paddr(EPT_RA | EPT_EA, PT_AD_MASK, OP_WRITE); 3079 ept_access_allowed_paddr(EPT_RA | EPT_EA, PT_AD_MASK, OP_EXEC); 3080 } 3081 3082 static void ept_access_test_paddr_read_execute_ad_enabled(void) 3083 { 3084 /* 3085 * When EPT AD bits are enabled, all accesses to guest paging 3086 * structures are considered writes as far as EPT translation 3087 * is concerned. 3088 */ 3089 u64 qual = EPT_VLT_WR | EPT_VLT_RD | EPT_VLT_PERM_RD | EPT_VLT_PERM_EX; 3090 3091 ept_access_test_setup(); 3092 ept_enable_ad_bits_or_skip_test(); 3093 3094 ept_access_violation_paddr(EPT_RA | EPT_EA, 0, OP_READ, qual); 3095 ept_access_violation_paddr(EPT_RA | EPT_EA, 0, OP_WRITE, qual); 3096 ept_access_violation_paddr(EPT_RA | EPT_EA, 0, OP_EXEC, qual); 3097 ept_access_violation_paddr(EPT_RA | EPT_EA, PT_ACCESSED_MASK, OP_READ, qual); 3098 ept_access_violation_paddr(EPT_RA | EPT_EA, PT_ACCESSED_MASK, OP_WRITE, qual); 3099 ept_access_violation_paddr(EPT_RA | EPT_EA, PT_ACCESSED_MASK, OP_EXEC, qual); 3100 ept_access_violation_paddr(EPT_RA | EPT_EA, PT_AD_MASK, OP_READ, qual); 3101 ept_access_violation_paddr(EPT_RA | EPT_EA, PT_AD_MASK, OP_WRITE, qual); 3102 ept_access_violation_paddr(EPT_RA | EPT_EA, PT_AD_MASK, OP_EXEC, qual); 3103 } 3104 3105 static void ept_access_test_paddr_not_present_page_fault(void) 3106 { 3107 ept_access_test_setup(); 3108 /* 3109 * TODO: test no EPT violation as long as guest PF occurs. e.g., GPA is 3110 * page is read-only in EPT but GVA is also mapped read only in PT. 3111 * Thus guest page fault before host takes EPT violation for trying to 3112 * update A bit. 3113 */ 3114 } 3115 3116 static void ept_access_test_force_2m_page(void) 3117 { 3118 ept_access_test_setup(); 3119 3120 TEST_ASSERT_EQ(ept_2m_supported(), true); 3121 ept_allowed_at_level_mkhuge(true, 2, 0, 0, OP_READ); 3122 ept_violation_at_level_mkhuge(true, 2, EPT_PRESENT, EPT_RA, OP_WRITE, 3123 EPT_VLT_WR | EPT_VLT_PERM_RD | 3124 EPT_VLT_LADDR_VLD | EPT_VLT_PADDR); 3125 ept_misconfig_at_level_mkhuge(true, 2, EPT_PRESENT, EPT_WA); 3126 } 3127 3128 static bool invvpid_valid(u64 type, u64 vpid, u64 gla) 3129 { 3130 u64 msr = rdmsr(MSR_IA32_VMX_EPT_VPID_CAP); 3131 3132 TEST_ASSERT(msr & VPID_CAP_INVVPID); 3133 3134 if (type < INVVPID_ADDR || type > INVVPID_CONTEXT_LOCAL) 3135 return false; 3136 3137 if (!(msr & (1ull << (type + VPID_CAP_INVVPID_TYPES_SHIFT)))) 3138 return false; 3139 3140 if (vpid >> 16) 3141 return false; 3142 3143 if (type != INVVPID_ALL && !vpid) 3144 return false; 3145 3146 if (type == INVVPID_ADDR && !is_canonical(gla)) 3147 return false; 3148 3149 return true; 3150 } 3151 3152 static void try_invvpid(u64 type, u64 vpid, u64 gla) 3153 { 3154 int rc; 3155 bool valid = invvpid_valid(type, vpid, gla); 3156 u64 expected = valid ? VMXERR_UNSUPPORTED_VMCS_COMPONENT 3157 : VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID; 3158 /* 3159 * Set VMX_INST_ERROR to VMXERR_UNVALID_VMCS_COMPONENT, so 3160 * that we can tell if it is updated by INVVPID. 3161 */ 3162 vmcs_read(~0); 3163 rc = invvpid(type, vpid, gla); 3164 report(!rc == valid, "INVVPID type %ld VPID %lx GLA %lx %s", type, 3165 vpid, gla, 3166 valid ? "passes" : "fails"); 3167 report(vmcs_read(VMX_INST_ERROR) == expected, 3168 "After %s INVVPID, VMX_INST_ERR is %ld (actual %ld)", 3169 rc ? "failed" : "successful", 3170 expected, vmcs_read(VMX_INST_ERROR)); 3171 } 3172 3173 static void ds_invvpid(void *data) 3174 { 3175 u64 msr = rdmsr(MSR_IA32_VMX_EPT_VPID_CAP); 3176 u64 type = ffs(msr >> VPID_CAP_INVVPID_TYPES_SHIFT) - 1; 3177 3178 TEST_ASSERT(type >= INVVPID_ADDR && type <= INVVPID_CONTEXT_LOCAL); 3179 asm volatile("invvpid %0, %1" 3180 : 3181 : "m"(*(struct invvpid_operand *)data), 3182 "r"(type)); 3183 } 3184 3185 /* 3186 * The SS override is ignored in 64-bit mode, so we use an addressing 3187 * mode with %rsp as the base register to generate an implicit SS 3188 * reference. 3189 */ 3190 static void ss_invvpid(void *data) 3191 { 3192 u64 msr = rdmsr(MSR_IA32_VMX_EPT_VPID_CAP); 3193 u64 type = ffs(msr >> VPID_CAP_INVVPID_TYPES_SHIFT) - 1; 3194 3195 TEST_ASSERT(type >= INVVPID_ADDR && type <= INVVPID_CONTEXT_LOCAL); 3196 asm volatile("sub %%rsp,%0; invvpid (%%rsp,%0,1), %1" 3197 : "+r"(data) 3198 : "r"(type)); 3199 } 3200 3201 static void invvpid_test_gp(void) 3202 { 3203 bool fault; 3204 3205 fault = test_for_exception(GP_VECTOR, &ds_invvpid, 3206 (void *)NONCANONICAL); 3207 report(fault, "INVVPID with non-canonical DS operand raises #GP"); 3208 } 3209 3210 static void invvpid_test_ss(void) 3211 { 3212 bool fault; 3213 3214 fault = test_for_exception(SS_VECTOR, &ss_invvpid, 3215 (void *)NONCANONICAL); 3216 report(fault, "INVVPID with non-canonical SS operand raises #SS"); 3217 } 3218 3219 static void invvpid_test_pf(void) 3220 { 3221 void *vpage = alloc_vpage(); 3222 bool fault; 3223 3224 fault = test_for_exception(PF_VECTOR, &ds_invvpid, vpage); 3225 report(fault, "INVVPID with unmapped operand raises #PF"); 3226 } 3227 3228 static void try_compat_invvpid(void *unused) 3229 { 3230 struct far_pointer32 fp = { 3231 .offset = (uintptr_t)&&invvpid, 3232 .selector = KERNEL_CS32, 3233 }; 3234 register uintptr_t rsp asm("rsp"); 3235 3236 TEST_ASSERT_MSG(fp.offset == (uintptr_t)&&invvpid, 3237 "Code address too high."); 3238 TEST_ASSERT_MSG(rsp == (u32)rsp, "Stack address too high."); 3239 3240 asm goto ("lcall *%0" : : "m" (fp) : "rax" : invvpid); 3241 return; 3242 invvpid: 3243 asm volatile (".code32;" 3244 "invvpid (%eax), %eax;" 3245 "lret;" 3246 ".code64"); 3247 __builtin_unreachable(); 3248 } 3249 3250 static void invvpid_test_compatibility_mode(void) 3251 { 3252 bool fault; 3253 3254 fault = test_for_exception(UD_VECTOR, &try_compat_invvpid, NULL); 3255 report(fault, "Compatibility mode INVVPID raises #UD"); 3256 } 3257 3258 static void invvpid_test_not_in_vmx_operation(void) 3259 { 3260 bool fault; 3261 3262 TEST_ASSERT(!vmx_off()); 3263 fault = test_for_exception(UD_VECTOR, &ds_invvpid, NULL); 3264 report(fault, "INVVPID outside of VMX operation raises #UD"); 3265 TEST_ASSERT(!vmx_on()); 3266 } 3267 3268 /* 3269 * This does not test real-address mode, virtual-8086 mode, protected mode, 3270 * or CPL > 0. 3271 */ 3272 static void invvpid_test_v2(void) 3273 { 3274 u64 msr; 3275 int i; 3276 unsigned types = 0; 3277 unsigned type; 3278 3279 if (!(ctrl_cpu_rev[0].clr & CPU_SECONDARY) || 3280 !(ctrl_cpu_rev[1].clr & CPU_VPID)) 3281 test_skip("VPID not supported"); 3282 3283 msr = rdmsr(MSR_IA32_VMX_EPT_VPID_CAP); 3284 3285 if (!(msr & VPID_CAP_INVVPID)) 3286 test_skip("INVVPID not supported.\n"); 3287 3288 if (msr & VPID_CAP_INVVPID_ADDR) 3289 types |= 1u << INVVPID_ADDR; 3290 if (msr & VPID_CAP_INVVPID_CXTGLB) 3291 types |= 1u << INVVPID_CONTEXT_GLOBAL; 3292 if (msr & VPID_CAP_INVVPID_ALL) 3293 types |= 1u << INVVPID_ALL; 3294 if (msr & VPID_CAP_INVVPID_CXTLOC) 3295 types |= 1u << INVVPID_CONTEXT_LOCAL; 3296 3297 if (!types) 3298 test_skip("No INVVPID types supported.\n"); 3299 3300 for (i = -127; i < 128; i++) 3301 try_invvpid(i, 0xffff, 0); 3302 3303 /* 3304 * VPID must not be more than 16 bits. 3305 */ 3306 for (i = 0; i < 64; i++) 3307 for (type = 0; type < 4; type++) 3308 if (types & (1u << type)) 3309 try_invvpid(type, 1ul << i, 0); 3310 3311 /* 3312 * VPID must not be zero, except for "all contexts." 3313 */ 3314 for (type = 0; type < 4; type++) 3315 if (types & (1u << type)) 3316 try_invvpid(type, 0, 0); 3317 3318 /* 3319 * The gla operand is only validated for single-address INVVPID. 3320 */ 3321 if (types & (1u << INVVPID_ADDR)) 3322 try_invvpid(INVVPID_ADDR, 0xffff, NONCANONICAL); 3323 3324 invvpid_test_gp(); 3325 invvpid_test_ss(); 3326 invvpid_test_pf(); 3327 invvpid_test_compatibility_mode(); 3328 invvpid_test_not_in_vmx_operation(); 3329 } 3330 3331 /* 3332 * Test for early VMLAUNCH failure. Returns true if VMLAUNCH makes it 3333 * at least as far as the guest-state checks. Returns false if the 3334 * VMLAUNCH fails early and execution falls through to the next 3335 * instruction. 3336 */ 3337 static bool vmlaunch_succeeds(void) 3338 { 3339 u32 exit_reason; 3340 3341 /* 3342 * Indirectly set VMX_INST_ERR to 12 ("VMREAD/VMWRITE from/to 3343 * unsupported VMCS component"). The caller can then check 3344 * to see if a failed VM-entry sets VMX_INST_ERR as expected. 3345 */ 3346 vmcs_write(~0u, 0); 3347 3348 vmcs_write(HOST_RIP, (uintptr_t)&&success); 3349 __asm__ __volatile__ goto ("vmwrite %%rsp, %0; vmlaunch" 3350 : 3351 : "r" ((u64)HOST_RSP) 3352 : "cc", "memory" 3353 : success); 3354 return false; 3355 success: 3356 exit_reason = vmcs_read(EXI_REASON); 3357 TEST_ASSERT(exit_reason == (VMX_FAIL_STATE | VMX_ENTRY_FAILURE) || 3358 exit_reason == (VMX_FAIL_MSR | VMX_ENTRY_FAILURE)); 3359 return true; 3360 } 3361 3362 /* 3363 * Try to launch the current VMCS. 3364 */ 3365 static void test_vmx_vmlaunch(u32 xerror) 3366 { 3367 bool success = vmlaunch_succeeds(); 3368 u32 vmx_inst_err; 3369 3370 report(success == !xerror, "vmlaunch %s", 3371 !xerror ? "succeeds" : "fails"); 3372 if (!success && xerror) { 3373 vmx_inst_err = vmcs_read(VMX_INST_ERROR); 3374 report(vmx_inst_err == xerror, 3375 "VMX inst error is %d (actual %d)", xerror, 3376 vmx_inst_err); 3377 } 3378 } 3379 3380 /* 3381 * Try to launch the current VMCS, and expect one of two possible 3382 * errors (or success) codes. 3383 */ 3384 static void test_vmx_vmlaunch2(u32 xerror1, u32 xerror2) 3385 { 3386 bool success = vmlaunch_succeeds(); 3387 u32 vmx_inst_err; 3388 3389 if (!xerror1 == !xerror2) 3390 report(success == !xerror1, "vmlaunch %s", 3391 !xerror1 ? "succeeds" : "fails"); 3392 3393 if (!success && (xerror1 || xerror2)) { 3394 vmx_inst_err = vmcs_read(VMX_INST_ERROR); 3395 report(vmx_inst_err == xerror1 || vmx_inst_err == xerror2, 3396 "VMX inst error is %d or %d (actual %d)", xerror1, 3397 xerror2, vmx_inst_err); 3398 } 3399 } 3400 3401 static void test_vmx_invalid_controls(void) 3402 { 3403 test_vmx_vmlaunch(VMXERR_ENTRY_INVALID_CONTROL_FIELD); 3404 } 3405 3406 static void test_vmx_valid_controls(void) 3407 { 3408 test_vmx_vmlaunch(0); 3409 } 3410 3411 /* 3412 * Test a particular value of a VM-execution control bit, if the value 3413 * is required or if the value is zero. 3414 */ 3415 static void test_rsvd_ctl_bit_value(const char *name, union vmx_ctrl_msr msr, 3416 enum Encoding encoding, unsigned bit, 3417 unsigned val) 3418 { 3419 u32 mask = 1u << bit; 3420 bool expected; 3421 u32 controls; 3422 3423 if (msr.set & mask) 3424 TEST_ASSERT(msr.clr & mask); 3425 3426 /* 3427 * We can't arbitrarily turn on a control bit, because it may 3428 * introduce dependencies on other VMCS fields. So, we only 3429 * test turning on bits that have a required setting. 3430 */ 3431 if (val && (msr.clr & mask) && !(msr.set & mask)) 3432 return; 3433 3434 report_prefix_pushf("%s %s bit %d", 3435 val ? "Set" : "Clear", name, bit); 3436 3437 controls = vmcs_read(encoding); 3438 if (val) { 3439 vmcs_write(encoding, msr.set | mask); 3440 expected = (msr.clr & mask); 3441 } else { 3442 vmcs_write(encoding, msr.set & ~mask); 3443 expected = !(msr.set & mask); 3444 } 3445 if (expected) 3446 test_vmx_valid_controls(); 3447 else 3448 test_vmx_invalid_controls(); 3449 vmcs_write(encoding, controls); 3450 report_prefix_pop(); 3451 } 3452 3453 /* 3454 * Test reserved values of a VM-execution control bit, based on the 3455 * allowed bit settings from the corresponding VMX capability MSR. 3456 */ 3457 static void test_rsvd_ctl_bit(const char *name, union vmx_ctrl_msr msr, 3458 enum Encoding encoding, unsigned bit) 3459 { 3460 test_rsvd_ctl_bit_value(name, msr, encoding, bit, 0); 3461 test_rsvd_ctl_bit_value(name, msr, encoding, bit, 1); 3462 } 3463 3464 /* 3465 * Reserved bits in the pin-based VM-execution controls must be set 3466 * properly. Software may consult the VMX capability MSRs to determine 3467 * the proper settings. 3468 * [Intel SDM] 3469 */ 3470 static void test_pin_based_ctls(void) 3471 { 3472 unsigned bit; 3473 3474 printf("%s: %lx\n", basic.ctrl ? "MSR_IA32_VMX_TRUE_PIN" : 3475 "MSR_IA32_VMX_PINBASED_CTLS", ctrl_pin_rev.val); 3476 for (bit = 0; bit < 32; bit++) 3477 test_rsvd_ctl_bit("pin-based controls", 3478 ctrl_pin_rev, PIN_CONTROLS, bit); 3479 } 3480 3481 /* 3482 * Reserved bits in the primary processor-based VM-execution controls 3483 * must be set properly. Software may consult the VMX capability MSRs 3484 * to determine the proper settings. 3485 * [Intel SDM] 3486 */ 3487 static void test_primary_processor_based_ctls(void) 3488 { 3489 unsigned bit; 3490 3491 printf("\n%s: %lx\n", basic.ctrl ? "MSR_IA32_VMX_TRUE_PROC" : 3492 "MSR_IA32_VMX_PROCBASED_CTLS", ctrl_cpu_rev[0].val); 3493 for (bit = 0; bit < 32; bit++) 3494 test_rsvd_ctl_bit("primary processor-based controls", 3495 ctrl_cpu_rev[0], CPU_EXEC_CTRL0, bit); 3496 } 3497 3498 /* 3499 * If the "activate secondary controls" primary processor-based 3500 * VM-execution control is 1, reserved bits in the secondary 3501 * processor-based VM-execution controls must be cleared. Software may 3502 * consult the VMX capability MSRs to determine which bits are 3503 * reserved. 3504 * If the "activate secondary controls" primary processor-based 3505 * VM-execution control is 0 (or if the processor does not support the 3506 * 1-setting of that control), no checks are performed on the 3507 * secondary processor-based VM-execution controls. 3508 * [Intel SDM] 3509 */ 3510 static void test_secondary_processor_based_ctls(void) 3511 { 3512 u32 primary; 3513 u32 secondary; 3514 unsigned bit; 3515 3516 if (!(ctrl_cpu_rev[0].clr & CPU_SECONDARY)) 3517 return; 3518 3519 primary = vmcs_read(CPU_EXEC_CTRL0); 3520 secondary = vmcs_read(CPU_EXEC_CTRL1); 3521 3522 vmcs_write(CPU_EXEC_CTRL0, primary | CPU_SECONDARY); 3523 printf("\nMSR_IA32_VMX_PROCBASED_CTLS2: %lx\n", ctrl_cpu_rev[1].val); 3524 for (bit = 0; bit < 32; bit++) 3525 test_rsvd_ctl_bit("secondary processor-based controls", 3526 ctrl_cpu_rev[1], CPU_EXEC_CTRL1, bit); 3527 3528 /* 3529 * When the "activate secondary controls" VM-execution control 3530 * is clear, there are no checks on the secondary controls. 3531 */ 3532 vmcs_write(CPU_EXEC_CTRL0, primary & ~CPU_SECONDARY); 3533 vmcs_write(CPU_EXEC_CTRL1, ~0); 3534 report(vmlaunch_succeeds(), 3535 "Secondary processor-based controls ignored"); 3536 vmcs_write(CPU_EXEC_CTRL1, secondary); 3537 vmcs_write(CPU_EXEC_CTRL0, primary); 3538 } 3539 3540 static void try_cr3_target_count(unsigned i, unsigned max) 3541 { 3542 report_prefix_pushf("CR3 target count 0x%x", i); 3543 vmcs_write(CR3_TARGET_COUNT, i); 3544 if (i <= max) 3545 test_vmx_valid_controls(); 3546 else 3547 test_vmx_invalid_controls(); 3548 report_prefix_pop(); 3549 } 3550 3551 /* 3552 * The CR3-target count must not be greater than 4. Future processors 3553 * may support a different number of CR3-target values. Software 3554 * should read the VMX capability MSR IA32_VMX_MISC to determine the 3555 * number of values supported. 3556 * [Intel SDM] 3557 */ 3558 static void test_cr3_targets(void) 3559 { 3560 unsigned supported_targets = (rdmsr(MSR_IA32_VMX_MISC) >> 16) & 0x1ff; 3561 u32 cr3_targets = vmcs_read(CR3_TARGET_COUNT); 3562 unsigned i; 3563 3564 printf("\nSupported CR3 targets: %d\n", supported_targets); 3565 TEST_ASSERT(supported_targets <= 256); 3566 3567 try_cr3_target_count(-1u, supported_targets); 3568 try_cr3_target_count(0x80000000, supported_targets); 3569 try_cr3_target_count(0x7fffffff, supported_targets); 3570 for (i = 0; i <= supported_targets + 1; i++) 3571 try_cr3_target_count(i, supported_targets); 3572 vmcs_write(CR3_TARGET_COUNT, cr3_targets); 3573 } 3574 3575 /* 3576 * Test a particular address setting in the VMCS 3577 */ 3578 static void test_vmcs_addr(const char *name, 3579 enum Encoding encoding, 3580 u64 align, 3581 bool ignored, 3582 bool skip_beyond_mapped_ram, 3583 u64 addr) 3584 { 3585 report_prefix_pushf("%s = %lx", name, addr); 3586 vmcs_write(encoding, addr); 3587 if (skip_beyond_mapped_ram && 3588 addr > fwcfg_get_u64(FW_CFG_RAM_SIZE) - align && 3589 addr < (1ul << cpuid_maxphyaddr())) 3590 printf("Skipping physical address beyond mapped RAM\n"); 3591 else if (ignored || (IS_ALIGNED(addr, align) && 3592 addr < (1ul << cpuid_maxphyaddr()))) 3593 test_vmx_valid_controls(); 3594 else 3595 test_vmx_invalid_controls(); 3596 report_prefix_pop(); 3597 } 3598 3599 /* 3600 * Test interesting values for a VMCS address 3601 */ 3602 static void test_vmcs_addr_values(const char *name, 3603 enum Encoding encoding, 3604 u64 align, 3605 bool ignored, 3606 bool skip_beyond_mapped_ram, 3607 u32 bit_start, u32 bit_end) 3608 { 3609 unsigned i; 3610 u64 orig_val = vmcs_read(encoding); 3611 3612 for (i = bit_start; i <= bit_end; i++) 3613 test_vmcs_addr(name, encoding, align, ignored, 3614 skip_beyond_mapped_ram, 1ul << i); 3615 3616 test_vmcs_addr(name, encoding, align, ignored, 3617 skip_beyond_mapped_ram, PAGE_SIZE - 1); 3618 test_vmcs_addr(name, encoding, align, ignored, 3619 skip_beyond_mapped_ram, PAGE_SIZE); 3620 test_vmcs_addr(name, encoding, align, ignored, 3621 skip_beyond_mapped_ram, 3622 (1ul << cpuid_maxphyaddr()) - PAGE_SIZE); 3623 test_vmcs_addr(name, encoding, align, ignored, 3624 skip_beyond_mapped_ram, -1ul); 3625 3626 vmcs_write(encoding, orig_val); 3627 } 3628 3629 /* 3630 * Test a physical address reference in the VMCS, when the corresponding 3631 * feature is enabled and when the corresponding feature is disabled. 3632 */ 3633 static void test_vmcs_addr_reference(u32 control_bit, enum Encoding field, 3634 const char *field_name, 3635 const char *control_name, u64 align, 3636 bool skip_beyond_mapped_ram, 3637 bool control_primary) 3638 { 3639 u32 primary = vmcs_read(CPU_EXEC_CTRL0); 3640 u32 secondary = vmcs_read(CPU_EXEC_CTRL1); 3641 u64 page_addr; 3642 3643 if (control_primary) { 3644 if (!(ctrl_cpu_rev[0].clr & control_bit)) 3645 return; 3646 } else { 3647 if (!(ctrl_cpu_rev[1].clr & control_bit)) 3648 return; 3649 } 3650 3651 page_addr = vmcs_read(field); 3652 3653 report_prefix_pushf("%s enabled", control_name); 3654 if (control_primary) { 3655 vmcs_write(CPU_EXEC_CTRL0, primary | control_bit); 3656 } else { 3657 vmcs_write(CPU_EXEC_CTRL0, primary | CPU_SECONDARY); 3658 vmcs_write(CPU_EXEC_CTRL1, secondary | control_bit); 3659 } 3660 3661 test_vmcs_addr_values(field_name, field, align, false, 3662 skip_beyond_mapped_ram, 0, 63); 3663 report_prefix_pop(); 3664 3665 report_prefix_pushf("%s disabled", control_name); 3666 if (control_primary) { 3667 vmcs_write(CPU_EXEC_CTRL0, primary & ~control_bit); 3668 } else { 3669 vmcs_write(CPU_EXEC_CTRL0, primary & ~CPU_SECONDARY); 3670 vmcs_write(CPU_EXEC_CTRL1, secondary & ~control_bit); 3671 } 3672 3673 test_vmcs_addr_values(field_name, field, align, true, false, 0, 63); 3674 report_prefix_pop(); 3675 3676 vmcs_write(field, page_addr); 3677 vmcs_write(CPU_EXEC_CTRL0, primary); 3678 vmcs_write(CPU_EXEC_CTRL1, secondary); 3679 } 3680 3681 /* 3682 * If the "use I/O bitmaps" VM-execution control is 1, bits 11:0 of 3683 * each I/O-bitmap address must be 0. Neither address should set any 3684 * bits beyond the processor's physical-address width. 3685 * [Intel SDM] 3686 */ 3687 static void test_io_bitmaps(void) 3688 { 3689 test_vmcs_addr_reference(CPU_IO_BITMAP, IO_BITMAP_A, 3690 "I/O bitmap A", "Use I/O bitmaps", 3691 PAGE_SIZE, false, true); 3692 test_vmcs_addr_reference(CPU_IO_BITMAP, IO_BITMAP_B, 3693 "I/O bitmap B", "Use I/O bitmaps", 3694 PAGE_SIZE, false, true); 3695 } 3696 3697 /* 3698 * If the "use MSR bitmaps" VM-execution control is 1, bits 11:0 of 3699 * the MSR-bitmap address must be 0. The address should not set any 3700 * bits beyond the processor's physical-address width. 3701 * [Intel SDM] 3702 */ 3703 static void test_msr_bitmap(void) 3704 { 3705 test_vmcs_addr_reference(CPU_MSR_BITMAP, MSR_BITMAP, 3706 "MSR bitmap", "Use MSR bitmaps", 3707 PAGE_SIZE, false, true); 3708 } 3709 3710 /* 3711 * If the "use TPR shadow" VM-execution control is 1, the virtual-APIC 3712 * address must satisfy the following checks: 3713 * - Bits 11:0 of the address must be 0. 3714 * - The address should not set any bits beyond the processor's 3715 * physical-address width. 3716 * [Intel SDM] 3717 */ 3718 static void test_apic_virt_addr(void) 3719 { 3720 /* 3721 * Ensure the processor will never use the virtual-APIC page, since 3722 * we will point it to invalid RAM. Otherwise KVM is puzzled about 3723 * what we're trying to achieve and fails vmentry. 3724 */ 3725 u32 cpu_ctrls0 = vmcs_read(CPU_EXEC_CTRL0); 3726 vmcs_write(CPU_EXEC_CTRL0, cpu_ctrls0 | CPU_CR8_LOAD | CPU_CR8_STORE); 3727 test_vmcs_addr_reference(CPU_TPR_SHADOW, APIC_VIRT_ADDR, 3728 "virtual-APIC address", "Use TPR shadow", 3729 PAGE_SIZE, false, true); 3730 vmcs_write(CPU_EXEC_CTRL0, cpu_ctrls0); 3731 } 3732 3733 /* 3734 * If the "virtualize APIC-accesses" VM-execution control is 1, the 3735 * APIC-access address must satisfy the following checks: 3736 * - Bits 11:0 of the address must be 0. 3737 * - The address should not set any bits beyond the processor's 3738 * physical-address width. 3739 * [Intel SDM] 3740 */ 3741 static void test_apic_access_addr(void) 3742 { 3743 void *apic_access_page = alloc_page(); 3744 3745 vmcs_write(APIC_ACCS_ADDR, virt_to_phys(apic_access_page)); 3746 3747 test_vmcs_addr_reference(CPU_VIRT_APIC_ACCESSES, APIC_ACCS_ADDR, 3748 "APIC-access address", 3749 "virtualize APIC-accesses", PAGE_SIZE, 3750 true, false); 3751 } 3752 3753 static bool set_bit_pattern(u8 mask, u32 *secondary) 3754 { 3755 u8 i; 3756 bool flag = false; 3757 u32 test_bits[3] = { 3758 CPU_VIRT_X2APIC, 3759 CPU_APIC_REG_VIRT, 3760 CPU_VINTD 3761 }; 3762 3763 for (i = 0; i < ARRAY_SIZE(test_bits); i++) { 3764 if ((mask & (1u << i)) && 3765 (ctrl_cpu_rev[1].clr & test_bits[i])) { 3766 *secondary |= test_bits[i]; 3767 flag = true; 3768 } 3769 } 3770 3771 return (flag); 3772 } 3773 3774 /* 3775 * If the "use TPR shadow" VM-execution control is 0, the following 3776 * VM-execution controls must also be 0: 3777 * - virtualize x2APIC mode 3778 * - APIC-register virtualization 3779 * - virtual-interrupt delivery 3780 * [Intel SDM] 3781 * 3782 * 2. If the "virtualize x2APIC mode" VM-execution control is 1, the 3783 * "virtualize APIC accesses" VM-execution control must be 0. 3784 * [Intel SDM] 3785 */ 3786 static void test_apic_virtual_ctls(void) 3787 { 3788 u32 saved_primary = vmcs_read(CPU_EXEC_CTRL0); 3789 u32 saved_secondary = vmcs_read(CPU_EXEC_CTRL1); 3790 u32 primary = saved_primary; 3791 u32 secondary = saved_secondary; 3792 bool ctrl = false; 3793 char str[10] = "disabled"; 3794 u8 i = 0, j; 3795 3796 /* 3797 * First test 3798 */ 3799 if (!((ctrl_cpu_rev[0].clr & (CPU_SECONDARY | CPU_TPR_SHADOW)) == 3800 (CPU_SECONDARY | CPU_TPR_SHADOW))) 3801 return; 3802 3803 primary |= CPU_SECONDARY; 3804 primary &= ~CPU_TPR_SHADOW; 3805 vmcs_write(CPU_EXEC_CTRL0, primary); 3806 3807 while (1) { 3808 for (j = 1; j < 8; j++) { 3809 secondary &= ~(CPU_VIRT_X2APIC | CPU_APIC_REG_VIRT | CPU_VINTD); 3810 if (primary & CPU_TPR_SHADOW) { 3811 ctrl = true; 3812 } else { 3813 if (! set_bit_pattern(j, &secondary)) 3814 ctrl = true; 3815 else 3816 ctrl = false; 3817 } 3818 3819 vmcs_write(CPU_EXEC_CTRL1, secondary); 3820 report_prefix_pushf("Use TPR shadow %s, virtualize x2APIC mode %s, APIC-register virtualization %s, virtual-interrupt delivery %s", 3821 str, (secondary & CPU_VIRT_X2APIC) ? "enabled" : "disabled", (secondary & CPU_APIC_REG_VIRT) ? "enabled" : "disabled", (secondary & CPU_VINTD) ? "enabled" : "disabled"); 3822 if (ctrl) 3823 test_vmx_valid_controls(); 3824 else 3825 test_vmx_invalid_controls(); 3826 report_prefix_pop(); 3827 } 3828 3829 if (i == 1) 3830 break; 3831 i++; 3832 3833 primary |= CPU_TPR_SHADOW; 3834 vmcs_write(CPU_EXEC_CTRL0, primary); 3835 strcpy(str, "enabled"); 3836 } 3837 3838 /* 3839 * Second test 3840 */ 3841 u32 apic_virt_ctls = (CPU_VIRT_X2APIC | CPU_VIRT_APIC_ACCESSES); 3842 3843 primary = saved_primary; 3844 secondary = saved_secondary; 3845 if (!((ctrl_cpu_rev[1].clr & apic_virt_ctls) == apic_virt_ctls)) 3846 return; 3847 3848 vmcs_write(CPU_EXEC_CTRL0, primary | CPU_SECONDARY); 3849 secondary &= ~CPU_VIRT_APIC_ACCESSES; 3850 vmcs_write(CPU_EXEC_CTRL1, secondary & ~CPU_VIRT_X2APIC); 3851 report_prefix_pushf("Virtualize x2APIC mode disabled; virtualize APIC access disabled"); 3852 test_vmx_valid_controls(); 3853 report_prefix_pop(); 3854 3855 vmcs_write(CPU_EXEC_CTRL1, secondary | CPU_VIRT_APIC_ACCESSES); 3856 report_prefix_pushf("Virtualize x2APIC mode disabled; virtualize APIC access enabled"); 3857 test_vmx_valid_controls(); 3858 report_prefix_pop(); 3859 3860 vmcs_write(CPU_EXEC_CTRL1, secondary | CPU_VIRT_X2APIC); 3861 report_prefix_pushf("Virtualize x2APIC mode enabled; virtualize APIC access enabled"); 3862 test_vmx_invalid_controls(); 3863 report_prefix_pop(); 3864 3865 vmcs_write(CPU_EXEC_CTRL1, secondary & ~CPU_VIRT_APIC_ACCESSES); 3866 report_prefix_pushf("Virtualize x2APIC mode enabled; virtualize APIC access disabled"); 3867 test_vmx_valid_controls(); 3868 report_prefix_pop(); 3869 3870 vmcs_write(CPU_EXEC_CTRL0, saved_primary); 3871 vmcs_write(CPU_EXEC_CTRL1, saved_secondary); 3872 } 3873 3874 /* 3875 * If the "virtual-interrupt delivery" VM-execution control is 1, the 3876 * "external-interrupt exiting" VM-execution control must be 1. 3877 * [Intel SDM] 3878 */ 3879 static void test_virtual_intr_ctls(void) 3880 { 3881 u32 saved_primary = vmcs_read(CPU_EXEC_CTRL0); 3882 u32 saved_secondary = vmcs_read(CPU_EXEC_CTRL1); 3883 u32 saved_pin = vmcs_read(PIN_CONTROLS); 3884 u32 primary = saved_primary; 3885 u32 secondary = saved_secondary; 3886 u32 pin = saved_pin; 3887 3888 if (!((ctrl_cpu_rev[1].clr & CPU_VINTD) && 3889 (ctrl_pin_rev.clr & PIN_EXTINT))) 3890 return; 3891 3892 vmcs_write(CPU_EXEC_CTRL0, primary | CPU_SECONDARY | CPU_TPR_SHADOW); 3893 vmcs_write(CPU_EXEC_CTRL1, secondary & ~CPU_VINTD); 3894 vmcs_write(PIN_CONTROLS, pin & ~PIN_EXTINT); 3895 report_prefix_pushf("Virtualize interrupt-delivery disabled; external-interrupt exiting disabled"); 3896 test_vmx_valid_controls(); 3897 report_prefix_pop(); 3898 3899 vmcs_write(CPU_EXEC_CTRL1, secondary | CPU_VINTD); 3900 report_prefix_pushf("Virtualize interrupt-delivery enabled; external-interrupt exiting disabled"); 3901 test_vmx_invalid_controls(); 3902 report_prefix_pop(); 3903 3904 vmcs_write(PIN_CONTROLS, pin | PIN_EXTINT); 3905 report_prefix_pushf("Virtualize interrupt-delivery enabled; external-interrupt exiting enabled"); 3906 test_vmx_valid_controls(); 3907 report_prefix_pop(); 3908 3909 vmcs_write(PIN_CONTROLS, pin & ~PIN_EXTINT); 3910 report_prefix_pushf("Virtualize interrupt-delivery enabled; external-interrupt exiting disabled"); 3911 test_vmx_invalid_controls(); 3912 report_prefix_pop(); 3913 3914 vmcs_write(CPU_EXEC_CTRL0, saved_primary); 3915 vmcs_write(CPU_EXEC_CTRL1, saved_secondary); 3916 vmcs_write(PIN_CONTROLS, saved_pin); 3917 } 3918 3919 static void test_pi_desc_addr(u64 addr, bool ctrl) 3920 { 3921 vmcs_write(POSTED_INTR_DESC_ADDR, addr); 3922 report_prefix_pushf("Process-posted-interrupts enabled; posted-interrupt-descriptor-address 0x%lx", addr); 3923 if (ctrl) 3924 test_vmx_valid_controls(); 3925 else 3926 test_vmx_invalid_controls(); 3927 report_prefix_pop(); 3928 } 3929 3930 /* 3931 * If the “process posted interrupts†VM-execution control is 1, the 3932 * following must be true: 3933 * 3934 * - The “virtual-interrupt delivery†VM-execution control is 1. 3935 * - The “acknowledge interrupt on exit†VM-exit control is 1. 3936 * - The posted-interrupt notification vector has a value in the 3937 * - range 0–255 (bits 15:8 are all 0). 3938 * - Bits 5:0 of the posted-interrupt descriptor address are all 0. 3939 * - The posted-interrupt descriptor address does not set any bits 3940 * beyond the processor's physical-address width. 3941 * [Intel SDM] 3942 */ 3943 static void test_posted_intr(void) 3944 { 3945 u32 saved_primary = vmcs_read(CPU_EXEC_CTRL0); 3946 u32 saved_secondary = vmcs_read(CPU_EXEC_CTRL1); 3947 u32 saved_pin = vmcs_read(PIN_CONTROLS); 3948 u32 exit_ctl_saved = vmcs_read(EXI_CONTROLS); 3949 u32 primary = saved_primary; 3950 u32 secondary = saved_secondary; 3951 u32 pin = saved_pin; 3952 u32 exit_ctl = exit_ctl_saved; 3953 u16 vec; 3954 int i; 3955 3956 if (!((ctrl_pin_rev.clr & PIN_POST_INTR) && 3957 (ctrl_cpu_rev[1].clr & CPU_VINTD) && 3958 (ctrl_exit_rev.clr & EXI_INTA))) 3959 return; 3960 3961 vmcs_write(CPU_EXEC_CTRL0, primary | CPU_SECONDARY | CPU_TPR_SHADOW); 3962 3963 /* 3964 * Test virtual-interrupt-delivery and acknowledge-interrupt-on-exit 3965 */ 3966 pin |= PIN_POST_INTR; 3967 vmcs_write(PIN_CONTROLS, pin); 3968 secondary &= ~CPU_VINTD; 3969 vmcs_write(CPU_EXEC_CTRL1, secondary); 3970 report_prefix_pushf("Process-posted-interrupts enabled; virtual-interrupt-delivery disabled"); 3971 test_vmx_invalid_controls(); 3972 report_prefix_pop(); 3973 3974 secondary |= CPU_VINTD; 3975 vmcs_write(CPU_EXEC_CTRL1, secondary); 3976 report_prefix_pushf("Process-posted-interrupts enabled; virtual-interrupt-delivery enabled"); 3977 test_vmx_invalid_controls(); 3978 report_prefix_pop(); 3979 3980 exit_ctl &= ~EXI_INTA; 3981 vmcs_write(EXI_CONTROLS, exit_ctl); 3982 report_prefix_pushf("Process-posted-interrupts enabled; virtual-interrupt-delivery enabled; acknowledge-interrupt-on-exit disabled"); 3983 test_vmx_invalid_controls(); 3984 report_prefix_pop(); 3985 3986 exit_ctl |= EXI_INTA; 3987 vmcs_write(EXI_CONTROLS, exit_ctl); 3988 report_prefix_pushf("Process-posted-interrupts enabled; virtual-interrupt-delivery enabled; acknowledge-interrupt-on-exit enabled"); 3989 test_vmx_valid_controls(); 3990 report_prefix_pop(); 3991 3992 secondary &= ~CPU_VINTD; 3993 vmcs_write(CPU_EXEC_CTRL1, secondary); 3994 report_prefix_pushf("Process-posted-interrupts enabled; virtual-interrupt-delivery disabled; acknowledge-interrupt-on-exit enabled"); 3995 test_vmx_invalid_controls(); 3996 report_prefix_pop(); 3997 3998 secondary |= CPU_VINTD; 3999 vmcs_write(CPU_EXEC_CTRL1, secondary); 4000 report_prefix_pushf("Process-posted-interrupts enabled; virtual-interrupt-delivery enabled; acknowledge-interrupt-on-exit enabled"); 4001 test_vmx_valid_controls(); 4002 report_prefix_pop(); 4003 4004 /* 4005 * Test posted-interrupt notification vector 4006 */ 4007 for (i = 0; i < 8; i++) { 4008 vec = (1ul << i); 4009 vmcs_write(PINV, vec); 4010 report_prefix_pushf("Process-posted-interrupts enabled; posted-interrupt-notification-vector %u", vec); 4011 test_vmx_valid_controls(); 4012 report_prefix_pop(); 4013 } 4014 for (i = 8; i < 16; i++) { 4015 vec = (1ul << i); 4016 vmcs_write(PINV, vec); 4017 report_prefix_pushf("Process-posted-interrupts enabled; posted-interrupt-notification-vector %u", vec); 4018 test_vmx_invalid_controls(); 4019 report_prefix_pop(); 4020 } 4021 4022 vec &= ~(0xff << 8); 4023 vmcs_write(PINV, vec); 4024 report_prefix_pushf("Process-posted-interrupts enabled; posted-interrupt-notification-vector %u", vec); 4025 test_vmx_valid_controls(); 4026 report_prefix_pop(); 4027 4028 /* 4029 * Test posted-interrupt descriptor addresss 4030 */ 4031 for (i = 0; i < 6; i++) { 4032 test_pi_desc_addr(1ul << i, false); 4033 } 4034 4035 test_pi_desc_addr(0xf0, false); 4036 test_pi_desc_addr(0xff, false); 4037 test_pi_desc_addr(0x0f, false); 4038 test_pi_desc_addr(0x8000, true); 4039 test_pi_desc_addr(0x00, true); 4040 test_pi_desc_addr(0xc000, true); 4041 4042 test_vmcs_addr_values("process-posted interrupts", 4043 POSTED_INTR_DESC_ADDR, 64, 4044 false, false, 0, 63); 4045 4046 vmcs_write(CPU_EXEC_CTRL0, saved_primary); 4047 vmcs_write(CPU_EXEC_CTRL1, saved_secondary); 4048 vmcs_write(PIN_CONTROLS, saved_pin); 4049 } 4050 4051 static void test_apic_ctls(void) 4052 { 4053 test_apic_virt_addr(); 4054 test_apic_access_addr(); 4055 test_apic_virtual_ctls(); 4056 test_virtual_intr_ctls(); 4057 test_posted_intr(); 4058 } 4059 4060 /* 4061 * If the “enable VPID†VM-execution control is 1, the value of the 4062 * of the VPID VM-execution control field must not be 0000H. 4063 * [Intel SDM] 4064 */ 4065 static void test_vpid(void) 4066 { 4067 u32 saved_primary = vmcs_read(CPU_EXEC_CTRL0); 4068 u32 saved_secondary = vmcs_read(CPU_EXEC_CTRL1); 4069 u16 vpid = 0x0000; 4070 int i; 4071 4072 if (!((ctrl_cpu_rev[0].clr & CPU_SECONDARY) && 4073 (ctrl_cpu_rev[1].clr & CPU_VPID))) { 4074 printf("Secondary controls and/or VPID not supported\n"); 4075 return; 4076 } 4077 4078 vmcs_write(CPU_EXEC_CTRL0, saved_primary | CPU_SECONDARY); 4079 vmcs_write(CPU_EXEC_CTRL1, saved_secondary & ~CPU_VPID); 4080 vmcs_write(VPID, vpid); 4081 report_prefix_pushf("VPID disabled; VPID value %x", vpid); 4082 test_vmx_valid_controls(); 4083 report_prefix_pop(); 4084 4085 vmcs_write(CPU_EXEC_CTRL1, saved_secondary | CPU_VPID); 4086 report_prefix_pushf("VPID enabled; VPID value %x", vpid); 4087 test_vmx_invalid_controls(); 4088 report_prefix_pop(); 4089 4090 for (i = 0; i < 16; i++) { 4091 vpid = (short)1 << i;; 4092 vmcs_write(VPID, vpid); 4093 report_prefix_pushf("VPID enabled; VPID value %x", vpid); 4094 test_vmx_valid_controls(); 4095 report_prefix_pop(); 4096 } 4097 4098 vmcs_write(CPU_EXEC_CTRL0, saved_primary); 4099 vmcs_write(CPU_EXEC_CTRL1, saved_secondary); 4100 } 4101 4102 static void set_vtpr(unsigned vtpr) 4103 { 4104 *(u32 *)phys_to_virt(vmcs_read(APIC_VIRT_ADDR) + APIC_TASKPRI) = vtpr; 4105 } 4106 4107 static void try_tpr_threshold_and_vtpr(unsigned threshold, unsigned vtpr) 4108 { 4109 bool valid = true; 4110 u32 primary = vmcs_read(CPU_EXEC_CTRL0); 4111 u32 secondary = vmcs_read(CPU_EXEC_CTRL1); 4112 4113 if ((primary & CPU_TPR_SHADOW) && 4114 (!(primary & CPU_SECONDARY) || 4115 !(secondary & (CPU_VINTD | CPU_VIRT_APIC_ACCESSES)))) 4116 valid = (threshold & 0xf) <= ((vtpr >> 4) & 0xf); 4117 4118 set_vtpr(vtpr); 4119 report_prefix_pushf("TPR threshold 0x%x, VTPR.class 0x%x", 4120 threshold, (vtpr >> 4) & 0xf); 4121 if (valid) 4122 test_vmx_valid_controls(); 4123 else 4124 test_vmx_invalid_controls(); 4125 report_prefix_pop(); 4126 } 4127 4128 static void test_invalid_event_injection(void) 4129 { 4130 u32 ent_intr_info_save = vmcs_read(ENT_INTR_INFO); 4131 u32 ent_intr_error_save = vmcs_read(ENT_INTR_ERROR); 4132 u32 ent_inst_len_save = vmcs_read(ENT_INST_LEN); 4133 u32 primary_save = vmcs_read(CPU_EXEC_CTRL0); 4134 u32 secondary_save = vmcs_read(CPU_EXEC_CTRL1); 4135 u64 guest_cr0_save = vmcs_read(GUEST_CR0); 4136 u32 ent_intr_info_base = INTR_INFO_VALID_MASK; 4137 u32 ent_intr_info, ent_intr_err, ent_intr_len; 4138 u32 cnt; 4139 4140 /* Setup */ 4141 report_prefix_push("invalid event injection"); 4142 vmcs_write(ENT_INTR_ERROR, 0x00000000); 4143 vmcs_write(ENT_INST_LEN, 0x00000001); 4144 4145 /* The field’s interruption type is not set to a reserved value. */ 4146 ent_intr_info = ent_intr_info_base | INTR_TYPE_RESERVED | DE_VECTOR; 4147 report_prefix_pushf("%s, VM-entry intr info=0x%x", 4148 "RESERVED interruption type invalid [-]", 4149 ent_intr_info); 4150 vmcs_write(ENT_INTR_INFO, ent_intr_info); 4151 test_vmx_invalid_controls(); 4152 report_prefix_pop(); 4153 4154 ent_intr_info = ent_intr_info_base | INTR_TYPE_EXT_INTR | 4155 DE_VECTOR; 4156 report_prefix_pushf("%s, VM-entry intr info=0x%x", 4157 "RESERVED interruption type invalid [+]", 4158 ent_intr_info); 4159 vmcs_write(ENT_INTR_INFO, ent_intr_info); 4160 test_vmx_valid_controls(); 4161 report_prefix_pop(); 4162 4163 /* If the interruption type is other event, the vector is 0. */ 4164 ent_intr_info = ent_intr_info_base | INTR_TYPE_OTHER_EVENT | DB_VECTOR; 4165 report_prefix_pushf("%s, VM-entry intr info=0x%x", 4166 "(OTHER EVENT && vector != 0) invalid [-]", 4167 ent_intr_info); 4168 vmcs_write(ENT_INTR_INFO, ent_intr_info); 4169 test_vmx_invalid_controls(); 4170 report_prefix_pop(); 4171 4172 /* If the interruption type is NMI, the vector is 2 (negative case). */ 4173 ent_intr_info = ent_intr_info_base | INTR_TYPE_NMI_INTR | DE_VECTOR; 4174 report_prefix_pushf("%s, VM-entry intr info=0x%x", 4175 "(NMI && vector != 2) invalid [-]", ent_intr_info); 4176 vmcs_write(ENT_INTR_INFO, ent_intr_info); 4177 test_vmx_invalid_controls(); 4178 report_prefix_pop(); 4179 4180 /* If the interruption type is NMI, the vector is 2 (positive case). */ 4181 ent_intr_info = ent_intr_info_base | INTR_TYPE_NMI_INTR | NMI_VECTOR; 4182 report_prefix_pushf("%s, VM-entry intr info=0x%x", 4183 "(NMI && vector == 2) valid [+]", ent_intr_info); 4184 vmcs_write(ENT_INTR_INFO, ent_intr_info); 4185 test_vmx_valid_controls(); 4186 report_prefix_pop(); 4187 4188 /* 4189 * If the interruption type 4190 * is HW exception, the vector is at most 31. 4191 */ 4192 ent_intr_info = ent_intr_info_base | INTR_TYPE_HARD_EXCEPTION | 0x20; 4193 report_prefix_pushf("%s, VM-entry intr info=0x%x", 4194 "(HW exception && vector > 31) invalid [-]", 4195 ent_intr_info); 4196 vmcs_write(ENT_INTR_INFO, ent_intr_info); 4197 test_vmx_invalid_controls(); 4198 report_prefix_pop(); 4199 4200 /* 4201 * deliver-error-code is 1 iff either 4202 * (a) the "unrestricted guest" VM-execution control is 0 4203 * (b) CR0.PE is set. 4204 */ 4205 4206 /* Assert that unrestricted guest is disabled or unsupported */ 4207 assert(!(ctrl_cpu_rev[0].clr & CPU_SECONDARY) || 4208 !(secondary_save & CPU_URG)); 4209 4210 ent_intr_info = ent_intr_info_base | INTR_TYPE_HARD_EXCEPTION | 4211 GP_VECTOR; 4212 report_prefix_pushf("%s, VM-entry intr info=0x%x", 4213 "error code <-> (!URG || prot_mode) [-]", 4214 ent_intr_info); 4215 vmcs_write(GUEST_CR0, guest_cr0_save & ~X86_CR0_PE & ~X86_CR0_PG); 4216 vmcs_write(ENT_INTR_INFO, ent_intr_info); 4217 test_vmx_invalid_controls(); 4218 report_prefix_pop(); 4219 4220 ent_intr_info = ent_intr_info_base | INTR_INFO_DELIVER_CODE_MASK | 4221 INTR_TYPE_HARD_EXCEPTION | GP_VECTOR; 4222 report_prefix_pushf("%s, VM-entry intr info=0x%x", 4223 "error code <-> (!URG || prot_mode) [+]", 4224 ent_intr_info); 4225 vmcs_write(GUEST_CR0, guest_cr0_save & ~X86_CR0_PE & ~X86_CR0_PG); 4226 vmcs_write(ENT_INTR_INFO, ent_intr_info); 4227 test_vmx_valid_controls(); 4228 report_prefix_pop(); 4229 4230 if (enable_unrestricted_guest()) 4231 goto skip_unrestricted_guest; 4232 4233 ent_intr_info = ent_intr_info_base | INTR_INFO_DELIVER_CODE_MASK | 4234 INTR_TYPE_HARD_EXCEPTION | GP_VECTOR; 4235 report_prefix_pushf("%s, VM-entry intr info=0x%x", 4236 "error code <-> (!URG || prot_mode) [-]", 4237 ent_intr_info); 4238 vmcs_write(GUEST_CR0, guest_cr0_save & ~X86_CR0_PE & ~X86_CR0_PG); 4239 vmcs_write(ENT_INTR_INFO, ent_intr_info); 4240 test_vmx_invalid_controls(); 4241 report_prefix_pop(); 4242 4243 ent_intr_info = ent_intr_info_base | INTR_TYPE_HARD_EXCEPTION | 4244 GP_VECTOR; 4245 report_prefix_pushf("%s, VM-entry intr info=0x%x", 4246 "error code <-> (!URG || prot_mode) [-]", 4247 ent_intr_info); 4248 vmcs_write(GUEST_CR0, guest_cr0_save | X86_CR0_PE); 4249 vmcs_write(ENT_INTR_INFO, ent_intr_info); 4250 test_vmx_invalid_controls(); 4251 report_prefix_pop(); 4252 4253 vmcs_write(CPU_EXEC_CTRL1, secondary_save); 4254 vmcs_write(CPU_EXEC_CTRL0, primary_save); 4255 4256 skip_unrestricted_guest: 4257 vmcs_write(GUEST_CR0, guest_cr0_save); 4258 4259 /* deliver-error-code is 1 iff the interruption type is HW exception */ 4260 report_prefix_push("error code <-> HW exception"); 4261 for (cnt = 0; cnt < 8; cnt++) { 4262 u32 exception_type_mask = cnt << 8; 4263 u32 deliver_error_code_mask = 4264 exception_type_mask != INTR_TYPE_HARD_EXCEPTION ? 4265 INTR_INFO_DELIVER_CODE_MASK : 0; 4266 4267 ent_intr_info = ent_intr_info_base | deliver_error_code_mask | 4268 exception_type_mask | GP_VECTOR; 4269 report_prefix_pushf("VM-entry intr info=0x%x [-]", 4270 ent_intr_info); 4271 vmcs_write(ENT_INTR_INFO, ent_intr_info); 4272 test_vmx_invalid_controls(); 4273 report_prefix_pop(); 4274 } 4275 report_prefix_pop(); 4276 4277 /* 4278 * deliver-error-code is 1 iff the the vector 4279 * indicates an exception that would normally deliver an error code 4280 */ 4281 report_prefix_push("error code <-> vector delivers error code"); 4282 for (cnt = 0; cnt < 32; cnt++) { 4283 bool has_error_code = false; 4284 u32 deliver_error_code_mask; 4285 4286 switch (cnt) { 4287 case DF_VECTOR: 4288 case TS_VECTOR: 4289 case NP_VECTOR: 4290 case SS_VECTOR: 4291 case GP_VECTOR: 4292 case PF_VECTOR: 4293 case AC_VECTOR: 4294 has_error_code = true; 4295 } 4296 4297 /* Negative case */ 4298 deliver_error_code_mask = has_error_code ? 4299 0 : 4300 INTR_INFO_DELIVER_CODE_MASK; 4301 ent_intr_info = ent_intr_info_base | deliver_error_code_mask | 4302 INTR_TYPE_HARD_EXCEPTION | cnt; 4303 report_prefix_pushf("VM-entry intr info=0x%x [-]", 4304 ent_intr_info); 4305 vmcs_write(ENT_INTR_INFO, ent_intr_info); 4306 test_vmx_invalid_controls(); 4307 report_prefix_pop(); 4308 4309 /* Positive case */ 4310 deliver_error_code_mask = has_error_code ? 4311 INTR_INFO_DELIVER_CODE_MASK : 4312 0; 4313 ent_intr_info = ent_intr_info_base | deliver_error_code_mask | 4314 INTR_TYPE_HARD_EXCEPTION | cnt; 4315 report_prefix_pushf("VM-entry intr info=0x%x [+]", 4316 ent_intr_info); 4317 vmcs_write(ENT_INTR_INFO, ent_intr_info); 4318 test_vmx_valid_controls(); 4319 report_prefix_pop(); 4320 } 4321 report_prefix_pop(); 4322 4323 /* Reserved bits in the field (30:12) are 0. */ 4324 report_prefix_push("reserved bits clear"); 4325 for (cnt = 12; cnt <= 30; cnt++) { 4326 ent_intr_info = ent_intr_info_base | 4327 INTR_INFO_DELIVER_CODE_MASK | 4328 INTR_TYPE_HARD_EXCEPTION | GP_VECTOR | 4329 (1U << cnt); 4330 report_prefix_pushf("VM-entry intr info=0x%x [-]", 4331 ent_intr_info); 4332 vmcs_write(ENT_INTR_INFO, ent_intr_info); 4333 test_vmx_invalid_controls(); 4334 report_prefix_pop(); 4335 } 4336 report_prefix_pop(); 4337 4338 /* 4339 * If deliver-error-code is 1 4340 * bits 31:16 of the VM-entry exception error-code field are 0. 4341 */ 4342 ent_intr_info = ent_intr_info_base | INTR_INFO_DELIVER_CODE_MASK | 4343 INTR_TYPE_HARD_EXCEPTION | GP_VECTOR; 4344 report_prefix_pushf("%s, VM-entry intr info=0x%x", 4345 "VM-entry exception error code[31:16] clear", 4346 ent_intr_info); 4347 vmcs_write(ENT_INTR_INFO, ent_intr_info); 4348 for (cnt = 16; cnt <= 31; cnt++) { 4349 ent_intr_err = 1U << cnt; 4350 report_prefix_pushf("VM-entry intr error=0x%x [-]", 4351 ent_intr_err); 4352 vmcs_write(ENT_INTR_ERROR, ent_intr_err); 4353 test_vmx_invalid_controls(); 4354 report_prefix_pop(); 4355 } 4356 vmcs_write(ENT_INTR_ERROR, 0x00000000); 4357 report_prefix_pop(); 4358 4359 /* 4360 * If the interruption type is software interrupt, software exception, 4361 * or privileged software exception, the VM-entry instruction-length 4362 * field is in the range 0–15. 4363 */ 4364 4365 for (cnt = 0; cnt < 3; cnt++) { 4366 switch (cnt) { 4367 case 0: 4368 ent_intr_info = ent_intr_info_base | 4369 INTR_TYPE_SOFT_INTR; 4370 break; 4371 case 1: 4372 ent_intr_info = ent_intr_info_base | 4373 INTR_TYPE_SOFT_EXCEPTION; 4374 break; 4375 case 2: 4376 ent_intr_info = ent_intr_info_base | 4377 INTR_TYPE_PRIV_SW_EXCEPTION; 4378 break; 4379 } 4380 report_prefix_pushf("%s, VM-entry intr info=0x%x", 4381 "VM-entry instruction-length check", 4382 ent_intr_info); 4383 vmcs_write(ENT_INTR_INFO, ent_intr_info); 4384 4385 /* Instruction length set to -1 (0xFFFFFFFF) should fail */ 4386 ent_intr_len = -1; 4387 report_prefix_pushf("VM-entry intr length = 0x%x [-]", 4388 ent_intr_len); 4389 vmcs_write(ENT_INST_LEN, ent_intr_len); 4390 test_vmx_invalid_controls(); 4391 report_prefix_pop(); 4392 4393 /* Instruction length set to 16 should fail */ 4394 ent_intr_len = 0x00000010; 4395 report_prefix_pushf("VM-entry intr length = 0x%x [-]", 4396 ent_intr_len); 4397 vmcs_write(ENT_INST_LEN, 0x00000010); 4398 test_vmx_invalid_controls(); 4399 report_prefix_pop(); 4400 4401 report_prefix_pop(); 4402 } 4403 4404 /* Cleanup */ 4405 vmcs_write(ENT_INTR_INFO, ent_intr_info_save); 4406 vmcs_write(ENT_INTR_ERROR, ent_intr_error_save); 4407 vmcs_write(ENT_INST_LEN, ent_inst_len_save); 4408 vmcs_write(CPU_EXEC_CTRL0, primary_save); 4409 vmcs_write(CPU_EXEC_CTRL1, secondary_save); 4410 vmcs_write(GUEST_CR0, guest_cr0_save); 4411 report_prefix_pop(); 4412 } 4413 4414 /* 4415 * Test interesting vTPR values for a given TPR threshold. 4416 */ 4417 static void test_vtpr_values(unsigned threshold) 4418 { 4419 try_tpr_threshold_and_vtpr(threshold, (threshold - 1) << 4); 4420 try_tpr_threshold_and_vtpr(threshold, threshold << 4); 4421 try_tpr_threshold_and_vtpr(threshold, (threshold + 1) << 4); 4422 } 4423 4424 static void try_tpr_threshold(unsigned threshold) 4425 { 4426 bool valid = true; 4427 4428 u32 primary = vmcs_read(CPU_EXEC_CTRL0); 4429 u32 secondary = vmcs_read(CPU_EXEC_CTRL1); 4430 4431 if ((primary & CPU_TPR_SHADOW) && !((primary & CPU_SECONDARY) && 4432 (secondary & CPU_VINTD))) 4433 valid = !(threshold >> 4); 4434 4435 set_vtpr(-1); 4436 vmcs_write(TPR_THRESHOLD, threshold); 4437 report_prefix_pushf("TPR threshold 0x%x, VTPR.class 0xf", threshold); 4438 if (valid) 4439 test_vmx_valid_controls(); 4440 else 4441 test_vmx_invalid_controls(); 4442 report_prefix_pop(); 4443 4444 if (valid) 4445 test_vtpr_values(threshold); 4446 } 4447 4448 /* 4449 * Test interesting TPR threshold values. 4450 */ 4451 static void test_tpr_threshold_values(void) 4452 { 4453 unsigned i; 4454 4455 for (i = 0; i < 0x10; i++) 4456 try_tpr_threshold(i); 4457 for (i = 4; i < 32; i++) 4458 try_tpr_threshold(1u << i); 4459 try_tpr_threshold(-1u); 4460 try_tpr_threshold(0x7fffffff); 4461 } 4462 4463 /* 4464 * This test covers the following two VM entry checks: 4465 * 4466 * i) If the "use TPR shadow" VM-execution control is 1 and the 4467 * "virtual-interrupt delivery" VM-execution control is 0, bits 4468 * 31:4 of the TPR threshold VM-execution control field must 4469 be 0. 4470 * [Intel SDM] 4471 * 4472 * ii) If the "use TPR shadow" VM-execution control is 1, the 4473 * "virtual-interrupt delivery" VM-execution control is 0 4474 * and the "virtualize APIC accesses" VM-execution control 4475 * is 0, the value of bits 3:0 of the TPR threshold VM-execution 4476 * control field must not be greater than the value of bits 4477 * 7:4 of VTPR. 4478 * [Intel SDM] 4479 */ 4480 static void test_tpr_threshold(void) 4481 { 4482 u32 primary = vmcs_read(CPU_EXEC_CTRL0); 4483 u64 apic_virt_addr = vmcs_read(APIC_VIRT_ADDR); 4484 u64 threshold = vmcs_read(TPR_THRESHOLD); 4485 void *virtual_apic_page; 4486 4487 if (!(ctrl_cpu_rev[0].clr & CPU_TPR_SHADOW)) 4488 return; 4489 4490 virtual_apic_page = alloc_page(); 4491 memset(virtual_apic_page, 0xff, PAGE_SIZE); 4492 vmcs_write(APIC_VIRT_ADDR, virt_to_phys(virtual_apic_page)); 4493 4494 vmcs_write(CPU_EXEC_CTRL0, primary & ~(CPU_TPR_SHADOW | CPU_SECONDARY)); 4495 report_prefix_pushf("Use TPR shadow disabled, secondary controls disabled"); 4496 test_tpr_threshold_values(); 4497 report_prefix_pop(); 4498 vmcs_write(CPU_EXEC_CTRL0, vmcs_read(CPU_EXEC_CTRL0) | CPU_TPR_SHADOW); 4499 report_prefix_pushf("Use TPR shadow enabled, secondary controls disabled"); 4500 test_tpr_threshold_values(); 4501 report_prefix_pop(); 4502 4503 if (!((ctrl_cpu_rev[0].clr & CPU_SECONDARY) && 4504 (ctrl_cpu_rev[1].clr & (CPU_VINTD | CPU_VIRT_APIC_ACCESSES)))) 4505 goto out; 4506 u32 secondary = vmcs_read(CPU_EXEC_CTRL1); 4507 4508 if (ctrl_cpu_rev[1].clr & CPU_VINTD) { 4509 vmcs_write(CPU_EXEC_CTRL1, CPU_VINTD); 4510 report_prefix_pushf("Use TPR shadow enabled; secondary controls disabled; virtual-interrupt delivery enabled; virtualize APIC accesses disabled"); 4511 test_tpr_threshold_values(); 4512 report_prefix_pop(); 4513 4514 vmcs_write(CPU_EXEC_CTRL0, 4515 vmcs_read(CPU_EXEC_CTRL0) | CPU_SECONDARY); 4516 report_prefix_pushf("Use TPR shadow enabled; secondary controls enabled; virtual-interrupt delivery enabled; virtualize APIC accesses disabled"); 4517 test_tpr_threshold_values(); 4518 report_prefix_pop(); 4519 } 4520 4521 if (ctrl_cpu_rev[1].clr & CPU_VIRT_APIC_ACCESSES) { 4522 vmcs_write(CPU_EXEC_CTRL0, 4523 vmcs_read(CPU_EXEC_CTRL0) & ~CPU_SECONDARY); 4524 vmcs_write(CPU_EXEC_CTRL1, CPU_VIRT_APIC_ACCESSES); 4525 report_prefix_pushf("Use TPR shadow enabled; secondary controls disabled; virtual-interrupt delivery enabled; virtualize APIC accesses enabled"); 4526 test_tpr_threshold_values(); 4527 report_prefix_pop(); 4528 4529 vmcs_write(CPU_EXEC_CTRL0, 4530 vmcs_read(CPU_EXEC_CTRL0) | CPU_SECONDARY); 4531 report_prefix_pushf("Use TPR shadow enabled; secondary controls enabled; virtual-interrupt delivery enabled; virtualize APIC accesses enabled"); 4532 test_tpr_threshold_values(); 4533 report_prefix_pop(); 4534 } 4535 4536 if ((ctrl_cpu_rev[1].clr & 4537 (CPU_VINTD | CPU_VIRT_APIC_ACCESSES)) == 4538 (CPU_VINTD | CPU_VIRT_APIC_ACCESSES)) { 4539 vmcs_write(CPU_EXEC_CTRL0, 4540 vmcs_read(CPU_EXEC_CTRL0) & ~CPU_SECONDARY); 4541 vmcs_write(CPU_EXEC_CTRL1, 4542 CPU_VINTD | CPU_VIRT_APIC_ACCESSES); 4543 report_prefix_pushf("Use TPR shadow enabled; secondary controls disabled; virtual-interrupt delivery enabled; virtualize APIC accesses enabled"); 4544 test_tpr_threshold_values(); 4545 report_prefix_pop(); 4546 4547 vmcs_write(CPU_EXEC_CTRL0, 4548 vmcs_read(CPU_EXEC_CTRL0) | CPU_SECONDARY); 4549 report_prefix_pushf("Use TPR shadow enabled; secondary controls enabled; virtual-interrupt delivery enabled; virtualize APIC accesses enabled"); 4550 test_tpr_threshold_values(); 4551 report_prefix_pop(); 4552 } 4553 4554 vmcs_write(CPU_EXEC_CTRL1, secondary); 4555 out: 4556 vmcs_write(TPR_THRESHOLD, threshold); 4557 vmcs_write(APIC_VIRT_ADDR, apic_virt_addr); 4558 vmcs_write(CPU_EXEC_CTRL0, primary); 4559 } 4560 4561 /* 4562 * This test verifies the following two vmentry checks: 4563 * 4564 * If the "NMI exiting" VM-execution control is 0, "Virtual NMIs" 4565 * VM-execution control must be 0. 4566 * [Intel SDM] 4567 * 4568 * If the “virtual NMIs” VM-execution control is 0, the “NMI-window 4569 * exiting” VM-execution control must be 0. 4570 * [Intel SDM] 4571 */ 4572 static void test_nmi_ctrls(void) 4573 { 4574 u32 pin_ctrls, cpu_ctrls0, test_pin_ctrls, test_cpu_ctrls0; 4575 4576 if ((ctrl_pin_rev.clr & (PIN_NMI | PIN_VIRT_NMI)) != 4577 (PIN_NMI | PIN_VIRT_NMI)) { 4578 printf("NMI exiting and Virtual NMIs are not supported !\n"); 4579 return; 4580 } 4581 4582 /* Save the controls so that we can restore them after our tests */ 4583 pin_ctrls = vmcs_read(PIN_CONTROLS); 4584 cpu_ctrls0 = vmcs_read(CPU_EXEC_CTRL0); 4585 4586 test_pin_ctrls = pin_ctrls & ~(PIN_NMI | PIN_VIRT_NMI); 4587 test_cpu_ctrls0 = cpu_ctrls0 & ~CPU_NMI_WINDOW; 4588 4589 vmcs_write(PIN_CONTROLS, test_pin_ctrls); 4590 report_prefix_pushf("NMI-exiting disabled, virtual-NMIs disabled"); 4591 test_vmx_valid_controls(); 4592 report_prefix_pop(); 4593 4594 vmcs_write(PIN_CONTROLS, test_pin_ctrls | PIN_VIRT_NMI); 4595 report_prefix_pushf("NMI-exiting disabled, virtual-NMIs enabled"); 4596 test_vmx_invalid_controls(); 4597 report_prefix_pop(); 4598 4599 vmcs_write(PIN_CONTROLS, test_pin_ctrls | (PIN_NMI | PIN_VIRT_NMI)); 4600 report_prefix_pushf("NMI-exiting enabled, virtual-NMIs enabled"); 4601 test_vmx_valid_controls(); 4602 report_prefix_pop(); 4603 4604 vmcs_write(PIN_CONTROLS, test_pin_ctrls | PIN_NMI); 4605 report_prefix_pushf("NMI-exiting enabled, virtual-NMIs disabled"); 4606 test_vmx_valid_controls(); 4607 report_prefix_pop(); 4608 4609 if (!(ctrl_cpu_rev[0].clr & CPU_NMI_WINDOW)) { 4610 report_info("NMI-window exiting is not supported, skipping..."); 4611 goto done; 4612 } 4613 4614 vmcs_write(PIN_CONTROLS, test_pin_ctrls); 4615 vmcs_write(CPU_EXEC_CTRL0, test_cpu_ctrls0 | CPU_NMI_WINDOW); 4616 report_prefix_pushf("Virtual-NMIs disabled, NMI-window-exiting enabled"); 4617 test_vmx_invalid_controls(); 4618 report_prefix_pop(); 4619 4620 vmcs_write(PIN_CONTROLS, test_pin_ctrls); 4621 vmcs_write(CPU_EXEC_CTRL0, test_cpu_ctrls0); 4622 report_prefix_pushf("Virtual-NMIs disabled, NMI-window-exiting disabled"); 4623 test_vmx_valid_controls(); 4624 report_prefix_pop(); 4625 4626 vmcs_write(PIN_CONTROLS, test_pin_ctrls | (PIN_NMI | PIN_VIRT_NMI)); 4627 vmcs_write(CPU_EXEC_CTRL0, test_cpu_ctrls0 | CPU_NMI_WINDOW); 4628 report_prefix_pushf("Virtual-NMIs enabled, NMI-window-exiting enabled"); 4629 test_vmx_valid_controls(); 4630 report_prefix_pop(); 4631 4632 vmcs_write(PIN_CONTROLS, test_pin_ctrls | (PIN_NMI | PIN_VIRT_NMI)); 4633 vmcs_write(CPU_EXEC_CTRL0, test_cpu_ctrls0); 4634 report_prefix_pushf("Virtual-NMIs enabled, NMI-window-exiting disabled"); 4635 test_vmx_valid_controls(); 4636 report_prefix_pop(); 4637 4638 /* Restore the controls to their original values */ 4639 vmcs_write(CPU_EXEC_CTRL0, cpu_ctrls0); 4640 done: 4641 vmcs_write(PIN_CONTROLS, pin_ctrls); 4642 } 4643 4644 static void test_eptp_ad_bit(u64 eptp, bool ctrl) 4645 { 4646 vmcs_write(EPTP, eptp); 4647 report_prefix_pushf("Enable-EPT enabled; EPT accessed and dirty flag %s", 4648 (eptp & EPTP_AD_FLAG) ? "1": "0"); 4649 if (ctrl) 4650 test_vmx_valid_controls(); 4651 else 4652 test_vmx_invalid_controls(); 4653 report_prefix_pop(); 4654 4655 } 4656 4657 /* 4658 * 1. If the "enable EPT" VM-execution control is 1, the "EPTP VM-execution" 4659 * control field must satisfy the following checks: 4660 * 4661 * - The EPT memory type (bits 2:0) must be a value supported by the 4662 * processor as indicated in the IA32_VMX_EPT_VPID_CAP MSR. 4663 * - Bits 5:3 (1 less than the EPT page-walk length) must be 3, 4664 * indicating an EPT page-walk length of 4. 4665 * - Bit 6 (enable bit for accessed and dirty flags for EPT) must be 4666 * 0 if bit 21 of the IA32_VMX_EPT_VPID_CAP MSR is read as 0, 4667 * indicating that the processor does not support accessed and dirty 4668 * dirty flags for EPT. 4669 * - Reserved bits 11:7 and 63:N (where N is the processor's 4670 * physical-address width) must all be 0. 4671 * 4672 * 2. If the "unrestricted guest" VM-execution control is 1, the 4673 * "enable EPT" VM-execution control must also be 1. 4674 */ 4675 static void test_ept_eptp(void) 4676 { 4677 u32 primary_saved = vmcs_read(CPU_EXEC_CTRL0); 4678 u32 secondary_saved = vmcs_read(CPU_EXEC_CTRL1); 4679 u64 eptp_saved = vmcs_read(EPTP); 4680 u32 primary = primary_saved; 4681 u32 secondary = secondary_saved; 4682 u64 msr, eptp = eptp_saved; 4683 bool un_cache = false; 4684 bool wr_bk = false; 4685 bool ctrl; 4686 u32 i, maxphysaddr; 4687 u64 j, resv_bits_mask = 0; 4688 4689 if (!((ctrl_cpu_rev[0].clr & CPU_SECONDARY) && 4690 (ctrl_cpu_rev[1].clr & CPU_EPT))) { 4691 printf("\"CPU secondary\" and/or \"enable EPT\" execution controls are not supported !\n"); 4692 return; 4693 } 4694 4695 /* 4696 * Memory type (bits 2:0) 4697 */ 4698 msr = rdmsr(MSR_IA32_VMX_EPT_VPID_CAP); 4699 if (msr & EPT_CAP_UC) 4700 un_cache = true; 4701 if (msr & EPT_CAP_WB) 4702 wr_bk = true; 4703 4704 primary |= CPU_SECONDARY; 4705 vmcs_write(CPU_EXEC_CTRL0, primary); 4706 secondary |= CPU_EPT; 4707 vmcs_write(CPU_EXEC_CTRL1, secondary); 4708 eptp = (eptp & ~EPTP_PG_WALK_LEN_MASK) | 4709 (3ul << EPTP_PG_WALK_LEN_SHIFT); 4710 vmcs_write(EPTP, eptp); 4711 4712 for (i = 0; i < 8; i++) { 4713 if (i == 0) { 4714 if (un_cache) { 4715 report_info("EPT paging structure memory-type is Un-cacheable\n"); 4716 ctrl = true; 4717 } else { 4718 ctrl = false; 4719 } 4720 } else if (i == 6) { 4721 if (wr_bk) { 4722 report_info("EPT paging structure memory-type is Write-back\n"); 4723 ctrl = true; 4724 } else { 4725 ctrl = false; 4726 } 4727 } else { 4728 ctrl = false; 4729 } 4730 4731 eptp = (eptp & ~EPT_MEM_TYPE_MASK) | i; 4732 vmcs_write(EPTP, eptp); 4733 report_prefix_pushf("Enable-EPT enabled; EPT memory type %lu", 4734 eptp & EPT_MEM_TYPE_MASK); 4735 if (ctrl) 4736 test_vmx_valid_controls(); 4737 else 4738 test_vmx_invalid_controls(); 4739 report_prefix_pop(); 4740 } 4741 4742 eptp = (eptp & ~EPT_MEM_TYPE_MASK) | 6ul; 4743 4744 /* 4745 * Page walk length (bits 5:3) 4746 */ 4747 for (i = 0; i < 8; i++) { 4748 eptp = (eptp & ~EPTP_PG_WALK_LEN_MASK) | 4749 (i << EPTP_PG_WALK_LEN_SHIFT); 4750 if (i == 3) 4751 ctrl = true; 4752 else 4753 ctrl = false; 4754 4755 vmcs_write(EPTP, eptp); 4756 report_prefix_pushf("Enable-EPT enabled; EPT page walk length %lu", 4757 eptp & EPTP_PG_WALK_LEN_MASK); 4758 if (ctrl) 4759 test_vmx_valid_controls(); 4760 else 4761 test_vmx_invalid_controls(); 4762 report_prefix_pop(); 4763 } 4764 4765 eptp = (eptp & ~EPTP_PG_WALK_LEN_MASK) | 4766 3ul << EPTP_PG_WALK_LEN_SHIFT; 4767 4768 /* 4769 * Accessed and dirty flag (bit 6) 4770 */ 4771 if (msr & EPT_CAP_AD_FLAG) { 4772 report_info("Processor supports accessed and dirty flag"); 4773 eptp &= ~EPTP_AD_FLAG; 4774 test_eptp_ad_bit(eptp, true); 4775 4776 eptp |= EPTP_AD_FLAG; 4777 test_eptp_ad_bit(eptp, true); 4778 } else { 4779 report_info("Processor does not supports accessed and dirty flag"); 4780 eptp &= ~EPTP_AD_FLAG; 4781 test_eptp_ad_bit(eptp, true); 4782 4783 eptp |= EPTP_AD_FLAG; 4784 test_eptp_ad_bit(eptp, false); 4785 } 4786 4787 /* 4788 * Reserved bits [11:7] and [63:N] 4789 */ 4790 for (i = 0; i < 32; i++) { 4791 eptp = (eptp & 4792 ~(EPTP_RESERV_BITS_MASK << EPTP_RESERV_BITS_SHIFT)) | 4793 (i << EPTP_RESERV_BITS_SHIFT); 4794 vmcs_write(EPTP, eptp); 4795 report_prefix_pushf("Enable-EPT enabled; reserved bits [11:7] %lu", 4796 (eptp >> EPTP_RESERV_BITS_SHIFT) & 4797 EPTP_RESERV_BITS_MASK); 4798 if (i == 0) 4799 test_vmx_valid_controls(); 4800 else 4801 test_vmx_invalid_controls(); 4802 report_prefix_pop(); 4803 } 4804 4805 eptp = (eptp & ~(EPTP_RESERV_BITS_MASK << EPTP_RESERV_BITS_SHIFT)); 4806 4807 maxphysaddr = cpuid_maxphyaddr(); 4808 for (i = 0; i < (63 - maxphysaddr + 1); i++) { 4809 resv_bits_mask |= 1ul << i; 4810 } 4811 4812 for (j = maxphysaddr - 1; j <= 63; j++) { 4813 eptp = (eptp & ~(resv_bits_mask << maxphysaddr)) | 4814 (j < maxphysaddr ? 0 : 1ul << j); 4815 vmcs_write(EPTP, eptp); 4816 report_prefix_pushf("Enable-EPT enabled; reserved bits [63:N] %lu", 4817 (eptp >> maxphysaddr) & resv_bits_mask); 4818 if (j < maxphysaddr) 4819 test_vmx_valid_controls(); 4820 else 4821 test_vmx_invalid_controls(); 4822 report_prefix_pop(); 4823 } 4824 4825 secondary &= ~(CPU_EPT | CPU_URG); 4826 vmcs_write(CPU_EXEC_CTRL1, secondary); 4827 report_prefix_pushf("Enable-EPT disabled, unrestricted-guest disabled"); 4828 test_vmx_valid_controls(); 4829 report_prefix_pop(); 4830 4831 if (!(ctrl_cpu_rev[1].clr & CPU_URG)) 4832 goto skip_unrestricted_guest; 4833 4834 secondary |= CPU_URG; 4835 vmcs_write(CPU_EXEC_CTRL1, secondary); 4836 report_prefix_pushf("Enable-EPT disabled, unrestricted-guest enabled"); 4837 test_vmx_invalid_controls(); 4838 report_prefix_pop(); 4839 4840 secondary |= CPU_EPT; 4841 setup_dummy_ept(); 4842 report_prefix_pushf("Enable-EPT enabled, unrestricted-guest enabled"); 4843 test_vmx_valid_controls(); 4844 report_prefix_pop(); 4845 4846 skip_unrestricted_guest: 4847 secondary &= ~CPU_URG; 4848 vmcs_write(CPU_EXEC_CTRL1, secondary); 4849 report_prefix_pushf("Enable-EPT enabled, unrestricted-guest disabled"); 4850 test_vmx_valid_controls(); 4851 report_prefix_pop(); 4852 4853 vmcs_write(CPU_EXEC_CTRL0, primary_saved); 4854 vmcs_write(CPU_EXEC_CTRL1, secondary_saved); 4855 vmcs_write(EPTP, eptp_saved); 4856 } 4857 4858 /* 4859 * If the 'enable PML' VM-execution control is 1, the 'enable EPT' 4860 * VM-execution control must also be 1. In addition, the PML address 4861 * must satisfy the following checks: 4862 * 4863 * * Bits 11:0 of the address must be 0. 4864 * * The address should not set any bits beyond the processor's 4865 * physical-address width. 4866 * 4867 * [Intel SDM] 4868 */ 4869 static void test_pml(void) 4870 { 4871 u32 primary_saved = vmcs_read(CPU_EXEC_CTRL0); 4872 u32 secondary_saved = vmcs_read(CPU_EXEC_CTRL1); 4873 u32 primary = primary_saved; 4874 u32 secondary = secondary_saved; 4875 4876 if (!((ctrl_cpu_rev[0].clr & CPU_SECONDARY) && 4877 (ctrl_cpu_rev[1].clr & CPU_EPT) && (ctrl_cpu_rev[1].clr & CPU_PML))) { 4878 printf("\"Secondary execution\" control or \"enable EPT\" control or \"enable PML\" control is not supported !\n"); 4879 return; 4880 } 4881 4882 primary |= CPU_SECONDARY; 4883 vmcs_write(CPU_EXEC_CTRL0, primary); 4884 secondary &= ~(CPU_PML | CPU_EPT); 4885 vmcs_write(CPU_EXEC_CTRL1, secondary); 4886 report_prefix_pushf("enable-PML disabled, enable-EPT disabled"); 4887 test_vmx_valid_controls(); 4888 report_prefix_pop(); 4889 4890 secondary |= CPU_PML; 4891 vmcs_write(CPU_EXEC_CTRL1, secondary); 4892 report_prefix_pushf("enable-PML enabled, enable-EPT disabled"); 4893 test_vmx_invalid_controls(); 4894 report_prefix_pop(); 4895 4896 secondary |= CPU_EPT; 4897 setup_dummy_ept(); 4898 report_prefix_pushf("enable-PML enabled, enable-EPT enabled"); 4899 test_vmx_valid_controls(); 4900 report_prefix_pop(); 4901 4902 secondary &= ~CPU_PML; 4903 vmcs_write(CPU_EXEC_CTRL1, secondary); 4904 report_prefix_pushf("enable-PML disabled, enable EPT enabled"); 4905 test_vmx_valid_controls(); 4906 report_prefix_pop(); 4907 4908 test_vmcs_addr_reference(CPU_PML, PMLADDR, "PML address", "PML", 4909 PAGE_SIZE, false, false); 4910 4911 vmcs_write(CPU_EXEC_CTRL0, primary_saved); 4912 vmcs_write(CPU_EXEC_CTRL1, secondary_saved); 4913 } 4914 4915 /* 4916 * If the "activate VMX-preemption timer" VM-execution control is 0, the 4917 * the "save VMX-preemption timer value" VM-exit control must also be 0. 4918 * 4919 * [Intel SDM] 4920 */ 4921 static void test_vmx_preemption_timer(void) 4922 { 4923 u32 saved_pin = vmcs_read(PIN_CONTROLS); 4924 u32 saved_exit = vmcs_read(EXI_CONTROLS); 4925 u32 pin = saved_pin; 4926 u32 exit = saved_exit; 4927 4928 if (!((ctrl_exit_rev.clr & EXI_SAVE_PREEMPT) || 4929 (ctrl_pin_rev.clr & PIN_PREEMPT))) { 4930 printf("\"Save-VMX-preemption-timer\" control and/or \"Enable-VMX-preemption-timer\" control is not supported\n"); 4931 return; 4932 } 4933 4934 pin |= PIN_PREEMPT; 4935 vmcs_write(PIN_CONTROLS, pin); 4936 exit &= ~EXI_SAVE_PREEMPT; 4937 vmcs_write(EXI_CONTROLS, exit); 4938 report_prefix_pushf("enable-VMX-preemption-timer enabled, save-VMX-preemption-timer disabled"); 4939 test_vmx_valid_controls(); 4940 report_prefix_pop(); 4941 4942 exit |= EXI_SAVE_PREEMPT; 4943 vmcs_write(EXI_CONTROLS, exit); 4944 report_prefix_pushf("enable-VMX-preemption-timer enabled, save-VMX-preemption-timer enabled"); 4945 test_vmx_valid_controls(); 4946 report_prefix_pop(); 4947 4948 pin &= ~PIN_PREEMPT; 4949 vmcs_write(PIN_CONTROLS, pin); 4950 report_prefix_pushf("enable-VMX-preemption-timer disabled, save-VMX-preemption-timer enabled"); 4951 test_vmx_invalid_controls(); 4952 report_prefix_pop(); 4953 4954 exit &= ~EXI_SAVE_PREEMPT; 4955 vmcs_write(EXI_CONTROLS, exit); 4956 report_prefix_pushf("enable-VMX-preemption-timer disabled, save-VMX-preemption-timer disabled"); 4957 test_vmx_valid_controls(); 4958 report_prefix_pop(); 4959 4960 vmcs_write(PIN_CONTROLS, saved_pin); 4961 vmcs_write(EXI_CONTROLS, saved_exit); 4962 } 4963 4964 extern unsigned char test_mtf1; 4965 extern unsigned char test_mtf2; 4966 extern unsigned char test_mtf3; 4967 4968 static void test_mtf_guest(void) 4969 { 4970 asm ("vmcall;\n\t" 4971 "out %al, $0x80;\n\t" 4972 "test_mtf1:\n\t" 4973 "vmcall;\n\t" 4974 "out %al, $0x80;\n\t" 4975 "test_mtf2:\n\t" 4976 /* 4977 * Prepare for the 'MOV CR3' test. Attempt to induce a 4978 * general-protection fault by moving a non-canonical address into 4979 * CR3. The 'MOV CR3' instruction does not take an imm64 operand, 4980 * so we must MOV the desired value into a register first. 4981 * 4982 * MOV RAX is done before the VMCALL such that MTF is only enabled 4983 * for the instruction under test. 4984 */ 4985 "mov $0x8000000000000000, %rax;\n\t" 4986 "vmcall;\n\t" 4987 "mov %rax, %cr3;\n\t" 4988 "test_mtf3:\n\t" 4989 "vmcall;\n\t" 4990 /* 4991 * ICEBP/INT1 instruction. Though the instruction is now 4992 * documented, don't rely on assemblers enumerating the 4993 * instruction. Resort to hand assembly. 4994 */ 4995 ".byte 0xf1;\n\t"); 4996 } 4997 4998 static void test_mtf_gp_handler(struct ex_regs *regs) 4999 { 5000 regs->rip = (unsigned long) &test_mtf3; 5001 } 5002 5003 static void test_mtf_db_handler(struct ex_regs *regs) 5004 { 5005 } 5006 5007 static void enable_mtf(void) 5008 { 5009 u32 ctrl0 = vmcs_read(CPU_EXEC_CTRL0); 5010 5011 vmcs_write(CPU_EXEC_CTRL0, ctrl0 | CPU_MTF); 5012 } 5013 5014 static void disable_mtf(void) 5015 { 5016 u32 ctrl0 = vmcs_read(CPU_EXEC_CTRL0); 5017 5018 vmcs_write(CPU_EXEC_CTRL0, ctrl0 & ~CPU_MTF); 5019 } 5020 5021 static void enable_tf(void) 5022 { 5023 unsigned long rflags = vmcs_read(GUEST_RFLAGS); 5024 5025 vmcs_write(GUEST_RFLAGS, rflags | X86_EFLAGS_TF); 5026 } 5027 5028 static void disable_tf(void) 5029 { 5030 unsigned long rflags = vmcs_read(GUEST_RFLAGS); 5031 5032 vmcs_write(GUEST_RFLAGS, rflags & ~X86_EFLAGS_TF); 5033 } 5034 5035 static void report_mtf(const char *insn_name, unsigned long exp_rip) 5036 { 5037 unsigned long rip = vmcs_read(GUEST_RIP); 5038 5039 assert_exit_reason(VMX_MTF); 5040 report(rip == exp_rip, "MTF VM-exit after %s instruction. RIP: 0x%lx (expected 0x%lx)", 5041 insn_name, rip, exp_rip); 5042 } 5043 5044 static void vmx_mtf_test(void) 5045 { 5046 unsigned long pending_dbg; 5047 handler old_gp, old_db; 5048 5049 if (!(ctrl_cpu_rev[0].clr & CPU_MTF)) { 5050 printf("CPU does not support the 'monitor trap flag' processor-based VM-execution control.\n"); 5051 return; 5052 } 5053 5054 test_set_guest(test_mtf_guest); 5055 5056 /* Expect an MTF VM-exit after OUT instruction */ 5057 enter_guest(); 5058 skip_exit_vmcall(); 5059 5060 enable_mtf(); 5061 enter_guest(); 5062 report_mtf("OUT", (unsigned long) &test_mtf1); 5063 disable_mtf(); 5064 5065 /* 5066 * Concurrent #DB trap and MTF on instruction boundary. Expect MTF 5067 * VM-exit with populated 'pending debug exceptions' VMCS field. 5068 */ 5069 enter_guest(); 5070 skip_exit_vmcall(); 5071 5072 enable_mtf(); 5073 enable_tf(); 5074 5075 enter_guest(); 5076 report_mtf("OUT", (unsigned long) &test_mtf2); 5077 pending_dbg = vmcs_read(GUEST_PENDING_DEBUG); 5078 report(pending_dbg & DR_STEP, 5079 "'pending debug exceptions' field after MTF VM-exit: 0x%lx (expected 0x%lx)", 5080 pending_dbg, (unsigned long) DR_STEP); 5081 5082 disable_mtf(); 5083 disable_tf(); 5084 vmcs_write(GUEST_PENDING_DEBUG, 0); 5085 5086 /* 5087 * #GP exception takes priority over MTF. Expect MTF VM-exit with RIP 5088 * advanced to first instruction of #GP handler. 5089 */ 5090 enter_guest(); 5091 skip_exit_vmcall(); 5092 5093 old_gp = handle_exception(GP_VECTOR, test_mtf_gp_handler); 5094 5095 enable_mtf(); 5096 enter_guest(); 5097 report_mtf("MOV CR3", (unsigned long) get_idt_addr(&boot_idt[GP_VECTOR])); 5098 disable_mtf(); 5099 5100 /* 5101 * Concurrent MTF and privileged software exception (i.e. ICEBP/INT1). 5102 * MTF should follow the delivery of #DB trap, though the SDM doesn't 5103 * provide clear indication of the relative priority. 5104 */ 5105 enter_guest(); 5106 skip_exit_vmcall(); 5107 5108 handle_exception(GP_VECTOR, old_gp); 5109 old_db = handle_exception(DB_VECTOR, test_mtf_db_handler); 5110 5111 enable_mtf(); 5112 enter_guest(); 5113 report_mtf("INT1", (unsigned long) get_idt_addr(&boot_idt[DB_VECTOR])); 5114 disable_mtf(); 5115 5116 enter_guest(); 5117 handle_exception(DB_VECTOR, old_db); 5118 } 5119 5120 /* 5121 * Tests for VM-execution control fields 5122 */ 5123 static void test_vm_execution_ctls(void) 5124 { 5125 test_pin_based_ctls(); 5126 test_primary_processor_based_ctls(); 5127 test_secondary_processor_based_ctls(); 5128 test_cr3_targets(); 5129 test_io_bitmaps(); 5130 test_msr_bitmap(); 5131 test_apic_ctls(); 5132 test_tpr_threshold(); 5133 test_nmi_ctrls(); 5134 test_pml(); 5135 test_vpid(); 5136 test_ept_eptp(); 5137 test_vmx_preemption_timer(); 5138 } 5139 5140 /* 5141 * The following checks are performed for the VM-entry MSR-load address if 5142 * the VM-entry MSR-load count field is non-zero: 5143 * 5144 * - The lower 4 bits of the VM-entry MSR-load address must be 0. 5145 * The address should not set any bits beyond the processor’s 5146 * physical-address width. 5147 * 5148 * - The address of the last byte in the VM-entry MSR-load area 5149 * should not set any bits beyond the processor’s physical-address 5150 * width. The address of this last byte is VM-entry MSR-load address 5151 * + (MSR count * 16) - 1. (The arithmetic used for the computation 5152 * uses more bits than the processor’s physical-address width.) 5153 * 5154 * 5155 * [Intel SDM] 5156 */ 5157 static void test_entry_msr_load(void) 5158 { 5159 entry_msr_load = alloc_page(); 5160 u64 tmp; 5161 u32 entry_msr_ld_cnt = 1; 5162 int i; 5163 u32 addr_len = 64; 5164 5165 vmcs_write(ENT_MSR_LD_CNT, entry_msr_ld_cnt); 5166 5167 /* Check first 4 bits of VM-entry MSR-load address */ 5168 for (i = 0; i < 4; i++) { 5169 tmp = (u64)entry_msr_load | 1ull << i; 5170 vmcs_write(ENTER_MSR_LD_ADDR, tmp); 5171 report_prefix_pushf("VM-entry MSR-load addr [4:0] %lx", 5172 tmp & 0xf); 5173 test_vmx_invalid_controls(); 5174 report_prefix_pop(); 5175 } 5176 5177 if (basic.val & (1ul << 48)) 5178 addr_len = 32; 5179 5180 test_vmcs_addr_values("VM-entry-MSR-load address", 5181 ENTER_MSR_LD_ADDR, 16, false, false, 5182 4, addr_len - 1); 5183 5184 /* 5185 * Check last byte of VM-entry MSR-load address 5186 */ 5187 entry_msr_load = (struct vmx_msr_entry *)((u64)entry_msr_load & ~0xf); 5188 5189 for (i = (addr_len == 64 ? cpuid_maxphyaddr(): addr_len); 5190 i < 64; i++) { 5191 tmp = ((u64)entry_msr_load + entry_msr_ld_cnt * 16 - 1) | 5192 1ul << i; 5193 vmcs_write(ENTER_MSR_LD_ADDR, 5194 tmp - (entry_msr_ld_cnt * 16 - 1)); 5195 test_vmx_invalid_controls(); 5196 } 5197 5198 vmcs_write(ENT_MSR_LD_CNT, 2); 5199 vmcs_write(ENTER_MSR_LD_ADDR, (1ULL << cpuid_maxphyaddr()) - 16); 5200 test_vmx_invalid_controls(); 5201 vmcs_write(ENTER_MSR_LD_ADDR, (1ULL << cpuid_maxphyaddr()) - 32); 5202 test_vmx_valid_controls(); 5203 vmcs_write(ENTER_MSR_LD_ADDR, (1ULL << cpuid_maxphyaddr()) - 48); 5204 test_vmx_valid_controls(); 5205 } 5206 5207 static struct vmx_state_area_test_data { 5208 u32 msr; 5209 u64 exp; 5210 bool enabled; 5211 } vmx_state_area_test_data; 5212 5213 static void guest_state_test_main(void) 5214 { 5215 u64 obs; 5216 struct vmx_state_area_test_data *data = &vmx_state_area_test_data; 5217 5218 while (1) { 5219 if (vmx_get_test_stage() == 2) 5220 break; 5221 5222 if (data->enabled) { 5223 obs = rdmsr(data->msr); 5224 report(data->exp == obs, 5225 "Guest state is 0x%lx (expected 0x%lx)", 5226 obs, data->exp); 5227 } 5228 5229 vmcall(); 5230 } 5231 5232 asm volatile("fnop"); 5233 } 5234 5235 static void test_guest_state(const char *test, bool xfail, u64 field, 5236 const char * field_name) 5237 { 5238 struct vmentry_result result; 5239 u8 abort_flags; 5240 5241 abort_flags = ABORT_ON_EARLY_VMENTRY_FAIL; 5242 if (!xfail) 5243 abort_flags = ABORT_ON_INVALID_GUEST_STATE; 5244 5245 __enter_guest(abort_flags, &result); 5246 5247 report(result.exit_reason.failed_vmentry == xfail && 5248 ((xfail && result.exit_reason.basic == VMX_FAIL_STATE) || 5249 (!xfail && result.exit_reason.basic == VMX_VMCALL)), 5250 "%s, %s %lx", test, field_name, field); 5251 5252 if (!result.exit_reason.failed_vmentry) 5253 skip_exit_insn(); 5254 } 5255 5256 /* 5257 * Tests for VM-entry control fields 5258 */ 5259 static void test_vm_entry_ctls(void) 5260 { 5261 test_invalid_event_injection(); 5262 test_entry_msr_load(); 5263 } 5264 5265 /* 5266 * The following checks are performed for the VM-exit MSR-store address if 5267 * the VM-exit MSR-store count field is non-zero: 5268 * 5269 * - The lower 4 bits of the VM-exit MSR-store address must be 0. 5270 * The address should not set any bits beyond the processor’s 5271 * physical-address width. 5272 * 5273 * - The address of the last byte in the VM-exit MSR-store area 5274 * should not set any bits beyond the processor’s physical-address 5275 * width. The address of this last byte is VM-exit MSR-store address 5276 * + (MSR count * 16) - 1. (The arithmetic used for the computation 5277 * uses more bits than the processor’s physical-address width.) 5278 * 5279 * If IA32_VMX_BASIC[48] is read as 1, neither address should set any bits 5280 * in the range 63:32. 5281 * 5282 * [Intel SDM] 5283 */ 5284 static void test_exit_msr_store(void) 5285 { 5286 exit_msr_store = alloc_page(); 5287 u64 tmp; 5288 u32 exit_msr_st_cnt = 1; 5289 int i; 5290 u32 addr_len = 64; 5291 5292 vmcs_write(EXI_MSR_ST_CNT, exit_msr_st_cnt); 5293 5294 /* Check first 4 bits of VM-exit MSR-store address */ 5295 for (i = 0; i < 4; i++) { 5296 tmp = (u64)exit_msr_store | 1ull << i; 5297 vmcs_write(EXIT_MSR_ST_ADDR, tmp); 5298 report_prefix_pushf("VM-exit MSR-store addr [4:0] %lx", 5299 tmp & 0xf); 5300 test_vmx_invalid_controls(); 5301 report_prefix_pop(); 5302 } 5303 5304 if (basic.val & (1ul << 48)) 5305 addr_len = 32; 5306 5307 test_vmcs_addr_values("VM-exit-MSR-store address", 5308 EXIT_MSR_ST_ADDR, 16, false, false, 5309 4, addr_len - 1); 5310 5311 /* 5312 * Check last byte of VM-exit MSR-store address 5313 */ 5314 exit_msr_store = (struct vmx_msr_entry *)((u64)exit_msr_store & ~0xf); 5315 5316 for (i = (addr_len == 64 ? cpuid_maxphyaddr(): addr_len); 5317 i < 64; i++) { 5318 tmp = ((u64)exit_msr_store + exit_msr_st_cnt * 16 - 1) | 5319 1ul << i; 5320 vmcs_write(EXIT_MSR_ST_ADDR, 5321 tmp - (exit_msr_st_cnt * 16 - 1)); 5322 test_vmx_invalid_controls(); 5323 } 5324 5325 vmcs_write(EXI_MSR_ST_CNT, 2); 5326 vmcs_write(EXIT_MSR_ST_ADDR, (1ULL << cpuid_maxphyaddr()) - 16); 5327 test_vmx_invalid_controls(); 5328 vmcs_write(EXIT_MSR_ST_ADDR, (1ULL << cpuid_maxphyaddr()) - 32); 5329 test_vmx_valid_controls(); 5330 vmcs_write(EXIT_MSR_ST_ADDR, (1ULL << cpuid_maxphyaddr()) - 48); 5331 test_vmx_valid_controls(); 5332 } 5333 5334 /* 5335 * Tests for VM-exit controls 5336 */ 5337 static void test_vm_exit_ctls(void) 5338 { 5339 test_exit_msr_store(); 5340 } 5341 5342 /* 5343 * Check that the virtual CPU checks all of the VMX controls as 5344 * documented in the Intel SDM. 5345 */ 5346 static void vmx_controls_test(void) 5347 { 5348 /* 5349 * Bit 1 of the guest's RFLAGS must be 1, or VM-entry will 5350 * fail due to invalid guest state, should we make it that 5351 * far. 5352 */ 5353 vmcs_write(GUEST_RFLAGS, 0); 5354 5355 test_vm_execution_ctls(); 5356 test_vm_exit_ctls(); 5357 test_vm_entry_ctls(); 5358 } 5359 5360 struct apic_reg_virt_config { 5361 bool apic_register_virtualization; 5362 bool use_tpr_shadow; 5363 bool virtualize_apic_accesses; 5364 bool virtualize_x2apic_mode; 5365 bool activate_secondary_controls; 5366 }; 5367 5368 struct apic_reg_test { 5369 const char *name; 5370 struct apic_reg_virt_config apic_reg_virt_config; 5371 }; 5372 5373 struct apic_reg_virt_expectation { 5374 enum Reason rd_exit_reason; 5375 enum Reason wr_exit_reason; 5376 u32 val; 5377 u32 (*virt_fn)(u32); 5378 5379 /* 5380 * If false, accessing the APIC access address from L2 is treated as a 5381 * normal memory operation, rather than triggering virtualization. 5382 */ 5383 bool virtualize_apic_accesses; 5384 }; 5385 5386 static u32 apic_virt_identity(u32 val) 5387 { 5388 return val; 5389 } 5390 5391 static u32 apic_virt_nibble1(u32 val) 5392 { 5393 return val & 0xf0; 5394 } 5395 5396 static u32 apic_virt_byte3(u32 val) 5397 { 5398 return val & (0xff << 24); 5399 } 5400 5401 static bool apic_reg_virt_exit_expectation( 5402 u32 reg, struct apic_reg_virt_config *config, 5403 struct apic_reg_virt_expectation *expectation) 5404 { 5405 /* Good configs, where some L2 APIC accesses are virtualized. */ 5406 bool virtualize_apic_accesses_only = 5407 config->virtualize_apic_accesses && 5408 !config->use_tpr_shadow && 5409 !config->apic_register_virtualization && 5410 !config->virtualize_x2apic_mode && 5411 config->activate_secondary_controls; 5412 bool virtualize_apic_accesses_and_use_tpr_shadow = 5413 config->virtualize_apic_accesses && 5414 config->use_tpr_shadow && 5415 !config->apic_register_virtualization && 5416 !config->virtualize_x2apic_mode && 5417 config->activate_secondary_controls; 5418 bool apic_register_virtualization = 5419 config->virtualize_apic_accesses && 5420 config->use_tpr_shadow && 5421 config->apic_register_virtualization && 5422 !config->virtualize_x2apic_mode && 5423 config->activate_secondary_controls; 5424 5425 expectation->val = MAGIC_VAL_1; 5426 expectation->virt_fn = apic_virt_identity; 5427 expectation->virtualize_apic_accesses = 5428 config->virtualize_apic_accesses && 5429 config->activate_secondary_controls; 5430 if (virtualize_apic_accesses_only) { 5431 expectation->rd_exit_reason = VMX_APIC_ACCESS; 5432 expectation->wr_exit_reason = VMX_APIC_ACCESS; 5433 } else if (virtualize_apic_accesses_and_use_tpr_shadow) { 5434 switch (reg) { 5435 case APIC_TASKPRI: 5436 expectation->rd_exit_reason = VMX_VMCALL; 5437 expectation->wr_exit_reason = VMX_VMCALL; 5438 expectation->virt_fn = apic_virt_nibble1; 5439 break; 5440 default: 5441 expectation->rd_exit_reason = VMX_APIC_ACCESS; 5442 expectation->wr_exit_reason = VMX_APIC_ACCESS; 5443 } 5444 } else if (apic_register_virtualization) { 5445 expectation->rd_exit_reason = VMX_VMCALL; 5446 5447 switch (reg) { 5448 case APIC_ID: 5449 case APIC_EOI: 5450 case APIC_LDR: 5451 case APIC_DFR: 5452 case APIC_SPIV: 5453 case APIC_ESR: 5454 case APIC_ICR: 5455 case APIC_LVTT: 5456 case APIC_LVTTHMR: 5457 case APIC_LVTPC: 5458 case APIC_LVT0: 5459 case APIC_LVT1: 5460 case APIC_LVTERR: 5461 case APIC_TMICT: 5462 case APIC_TDCR: 5463 expectation->wr_exit_reason = VMX_APIC_WRITE; 5464 break; 5465 case APIC_LVR: 5466 case APIC_ISR ... APIC_ISR + 0x70: 5467 case APIC_TMR ... APIC_TMR + 0x70: 5468 case APIC_IRR ... APIC_IRR + 0x70: 5469 expectation->wr_exit_reason = VMX_APIC_ACCESS; 5470 break; 5471 case APIC_TASKPRI: 5472 expectation->wr_exit_reason = VMX_VMCALL; 5473 expectation->virt_fn = apic_virt_nibble1; 5474 break; 5475 case APIC_ICR2: 5476 expectation->wr_exit_reason = VMX_VMCALL; 5477 expectation->virt_fn = apic_virt_byte3; 5478 break; 5479 default: 5480 expectation->rd_exit_reason = VMX_APIC_ACCESS; 5481 expectation->wr_exit_reason = VMX_APIC_ACCESS; 5482 } 5483 } else if (!expectation->virtualize_apic_accesses) { 5484 /* 5485 * No APIC registers are directly virtualized. This includes 5486 * VTPR, which can be virtualized through MOV to/from CR8 via 5487 * the use TPR shadow control, but not through directly 5488 * accessing VTPR. 5489 */ 5490 expectation->rd_exit_reason = VMX_VMCALL; 5491 expectation->wr_exit_reason = VMX_VMCALL; 5492 } else { 5493 printf("Cannot parse APIC register virtualization config:\n" 5494 "\tvirtualize_apic_accesses: %d\n" 5495 "\tuse_tpr_shadow: %d\n" 5496 "\tapic_register_virtualization: %d\n" 5497 "\tvirtualize_x2apic_mode: %d\n" 5498 "\tactivate_secondary_controls: %d\n", 5499 config->virtualize_apic_accesses, 5500 config->use_tpr_shadow, 5501 config->apic_register_virtualization, 5502 config->virtualize_x2apic_mode, 5503 config->activate_secondary_controls); 5504 5505 return false; 5506 } 5507 5508 return true; 5509 } 5510 5511 struct apic_reg_test apic_reg_tests[] = { 5512 /* Good configs, where some L2 APIC accesses are virtualized. */ 5513 { 5514 .name = "Virtualize APIC accesses", 5515 .apic_reg_virt_config = { 5516 .virtualize_apic_accesses = true, 5517 .use_tpr_shadow = false, 5518 .apic_register_virtualization = false, 5519 .virtualize_x2apic_mode = false, 5520 .activate_secondary_controls = true, 5521 }, 5522 }, 5523 { 5524 .name = "Virtualize APIC accesses + Use TPR shadow", 5525 .apic_reg_virt_config = { 5526 .virtualize_apic_accesses = true, 5527 .use_tpr_shadow = true, 5528 .apic_register_virtualization = false, 5529 .virtualize_x2apic_mode = false, 5530 .activate_secondary_controls = true, 5531 }, 5532 }, 5533 { 5534 .name = "APIC-register virtualization", 5535 .apic_reg_virt_config = { 5536 .virtualize_apic_accesses = true, 5537 .use_tpr_shadow = true, 5538 .apic_register_virtualization = true, 5539 .virtualize_x2apic_mode = false, 5540 .activate_secondary_controls = true, 5541 }, 5542 }, 5543 5544 /* 5545 * Test that the secondary processor-based VM-execution controls are 5546 * correctly ignored when "activate secondary controls" is disabled. 5547 */ 5548 { 5549 .name = "Activate secondary controls off", 5550 .apic_reg_virt_config = { 5551 .virtualize_apic_accesses = true, 5552 .use_tpr_shadow = false, 5553 .apic_register_virtualization = true, 5554 .virtualize_x2apic_mode = true, 5555 .activate_secondary_controls = false, 5556 }, 5557 }, 5558 { 5559 .name = "Activate secondary controls off + Use TPR shadow", 5560 .apic_reg_virt_config = { 5561 .virtualize_apic_accesses = true, 5562 .use_tpr_shadow = true, 5563 .apic_register_virtualization = true, 5564 .virtualize_x2apic_mode = true, 5565 .activate_secondary_controls = false, 5566 }, 5567 }, 5568 5569 /* 5570 * Test that the APIC access address is treated like an arbitrary memory 5571 * address when "virtualize APIC accesses" is disabled. 5572 */ 5573 { 5574 .name = "Virtualize APIC accesses off + Use TPR shadow", 5575 .apic_reg_virt_config = { 5576 .virtualize_apic_accesses = false, 5577 .use_tpr_shadow = true, 5578 .apic_register_virtualization = true, 5579 .virtualize_x2apic_mode = true, 5580 .activate_secondary_controls = true, 5581 }, 5582 }, 5583 5584 /* 5585 * Test that VM entry fails due to invalid controls when 5586 * "APIC-register virtualization" is enabled while "use TPR shadow" is 5587 * disabled. 5588 */ 5589 { 5590 .name = "APIC-register virtualization + Use TPR shadow off", 5591 .apic_reg_virt_config = { 5592 .virtualize_apic_accesses = true, 5593 .use_tpr_shadow = false, 5594 .apic_register_virtualization = true, 5595 .virtualize_x2apic_mode = false, 5596 .activate_secondary_controls = true, 5597 }, 5598 }, 5599 5600 /* 5601 * Test that VM entry fails due to invalid controls when 5602 * "Virtualize x2APIC mode" is enabled while "use TPR shadow" is 5603 * disabled. 5604 */ 5605 { 5606 .name = "Virtualize x2APIC mode + Use TPR shadow off", 5607 .apic_reg_virt_config = { 5608 .virtualize_apic_accesses = false, 5609 .use_tpr_shadow = false, 5610 .apic_register_virtualization = false, 5611 .virtualize_x2apic_mode = true, 5612 .activate_secondary_controls = true, 5613 }, 5614 }, 5615 { 5616 .name = "Virtualize x2APIC mode + Use TPR shadow off v2", 5617 .apic_reg_virt_config = { 5618 .virtualize_apic_accesses = false, 5619 .use_tpr_shadow = false, 5620 .apic_register_virtualization = true, 5621 .virtualize_x2apic_mode = true, 5622 .activate_secondary_controls = true, 5623 }, 5624 }, 5625 5626 /* 5627 * Test that VM entry fails due to invalid controls when 5628 * "virtualize x2APIC mode" is enabled while "virtualize APIC accesses" 5629 * is enabled. 5630 */ 5631 { 5632 .name = "Virtualize x2APIC mode + Virtualize APIC accesses", 5633 .apic_reg_virt_config = { 5634 .virtualize_apic_accesses = true, 5635 .use_tpr_shadow = true, 5636 .apic_register_virtualization = false, 5637 .virtualize_x2apic_mode = true, 5638 .activate_secondary_controls = true, 5639 }, 5640 }, 5641 { 5642 .name = "Virtualize x2APIC mode + Virtualize APIC accesses v2", 5643 .apic_reg_virt_config = { 5644 .virtualize_apic_accesses = true, 5645 .use_tpr_shadow = true, 5646 .apic_register_virtualization = true, 5647 .virtualize_x2apic_mode = true, 5648 .activate_secondary_controls = true, 5649 }, 5650 }, 5651 }; 5652 5653 enum Apic_op { 5654 APIC_OP_XAPIC_RD, 5655 APIC_OP_XAPIC_WR, 5656 TERMINATE, 5657 }; 5658 5659 static u32 vmx_xapic_read(u32 *apic_access_address, u32 reg) 5660 { 5661 return *(volatile u32 *)((uintptr_t)apic_access_address + reg); 5662 } 5663 5664 static void vmx_xapic_write(u32 *apic_access_address, u32 reg, u32 val) 5665 { 5666 *(volatile u32 *)((uintptr_t)apic_access_address + reg) = val; 5667 } 5668 5669 struct apic_reg_virt_guest_args { 5670 enum Apic_op op; 5671 u32 *apic_access_address; 5672 u32 reg; 5673 u32 val; 5674 bool check_rd; 5675 u32 (*virt_fn)(u32); 5676 } apic_reg_virt_guest_args; 5677 5678 static void apic_reg_virt_guest(void) 5679 { 5680 volatile struct apic_reg_virt_guest_args *args = 5681 &apic_reg_virt_guest_args; 5682 5683 for (;;) { 5684 enum Apic_op op = args->op; 5685 u32 *apic_access_address = args->apic_access_address; 5686 u32 reg = args->reg; 5687 u32 val = args->val; 5688 bool check_rd = args->check_rd; 5689 u32 (*virt_fn)(u32) = args->virt_fn; 5690 5691 if (op == TERMINATE) 5692 break; 5693 5694 if (op == APIC_OP_XAPIC_RD) { 5695 u32 ret = vmx_xapic_read(apic_access_address, reg); 5696 5697 if (check_rd) { 5698 u32 want = virt_fn(val); 5699 u32 got = virt_fn(ret); 5700 5701 report(got == want, 5702 "read 0x%x, expected 0x%x.", got, want); 5703 } 5704 } else if (op == APIC_OP_XAPIC_WR) { 5705 vmx_xapic_write(apic_access_address, reg, val); 5706 } 5707 5708 /* 5709 * The L1 should always execute a vmcall after it's done testing 5710 * an individual APIC operation. This helps to validate that the 5711 * L1 and L2 are in sync with each other, as expected. 5712 */ 5713 vmcall(); 5714 } 5715 } 5716 5717 static void test_xapic_rd( 5718 u32 reg, struct apic_reg_virt_expectation *expectation, 5719 u32 *apic_access_address, u32 *virtual_apic_page) 5720 { 5721 u32 val = expectation->val; 5722 u32 exit_reason_want = expectation->rd_exit_reason; 5723 struct apic_reg_virt_guest_args *args = &apic_reg_virt_guest_args; 5724 5725 report_prefix_pushf("xapic - reading 0x%03x", reg); 5726 5727 /* Configure guest to do an xapic read */ 5728 args->op = APIC_OP_XAPIC_RD; 5729 args->apic_access_address = apic_access_address; 5730 args->reg = reg; 5731 args->val = val; 5732 args->check_rd = exit_reason_want == VMX_VMCALL; 5733 args->virt_fn = expectation->virt_fn; 5734 5735 /* Setup virtual APIC page */ 5736 if (!expectation->virtualize_apic_accesses) { 5737 apic_access_address[apic_reg_index(reg)] = val; 5738 virtual_apic_page[apic_reg_index(reg)] = 0; 5739 } else if (exit_reason_want == VMX_VMCALL) { 5740 apic_access_address[apic_reg_index(reg)] = 0; 5741 virtual_apic_page[apic_reg_index(reg)] = val; 5742 } 5743 5744 /* Enter guest */ 5745 enter_guest(); 5746 5747 /* 5748 * Validate the behavior and 5749 * pass a magic value back to the guest. 5750 */ 5751 if (exit_reason_want == VMX_APIC_ACCESS) { 5752 u32 apic_page_offset = vmcs_read(EXI_QUALIFICATION) & 0xfff; 5753 5754 assert_exit_reason(exit_reason_want); 5755 report(apic_page_offset == reg, 5756 "got APIC access exit @ page offset 0x%03x, want 0x%03x", 5757 apic_page_offset, reg); 5758 skip_exit_insn(); 5759 5760 /* Reenter guest so it can consume/check rcx and exit again. */ 5761 enter_guest(); 5762 } else if (exit_reason_want != VMX_VMCALL) { 5763 report(false, "Oops, bad exit expectation: %u.", 5764 exit_reason_want); 5765 } 5766 5767 skip_exit_vmcall(); 5768 report_prefix_pop(); 5769 } 5770 5771 static void test_xapic_wr( 5772 u32 reg, struct apic_reg_virt_expectation *expectation, 5773 u32 *apic_access_address, u32 *virtual_apic_page) 5774 { 5775 u32 val = expectation->val; 5776 u32 exit_reason_want = expectation->wr_exit_reason; 5777 struct apic_reg_virt_guest_args *args = &apic_reg_virt_guest_args; 5778 bool virtualized = 5779 expectation->virtualize_apic_accesses && 5780 (exit_reason_want == VMX_APIC_WRITE || 5781 exit_reason_want == VMX_VMCALL); 5782 bool checked = false; 5783 5784 report_prefix_pushf("xapic - writing 0x%x to 0x%03x", val, reg); 5785 5786 /* Configure guest to do an xapic read */ 5787 args->op = APIC_OP_XAPIC_WR; 5788 args->apic_access_address = apic_access_address; 5789 args->reg = reg; 5790 args->val = val; 5791 5792 /* Setup virtual APIC page */ 5793 if (virtualized || !expectation->virtualize_apic_accesses) { 5794 apic_access_address[apic_reg_index(reg)] = 0; 5795 virtual_apic_page[apic_reg_index(reg)] = 0; 5796 } 5797 5798 /* Enter guest */ 5799 enter_guest(); 5800 5801 /* 5802 * Validate the behavior and 5803 * pass a magic value back to the guest. 5804 */ 5805 if (exit_reason_want == VMX_APIC_ACCESS) { 5806 u32 apic_page_offset = vmcs_read(EXI_QUALIFICATION) & 0xfff; 5807 5808 assert_exit_reason(exit_reason_want); 5809 report(apic_page_offset == reg, 5810 "got APIC access exit @ page offset 0x%03x, want 0x%03x", 5811 apic_page_offset, reg); 5812 skip_exit_insn(); 5813 5814 /* Reenter guest so it can consume/check rcx and exit again. */ 5815 enter_guest(); 5816 } else if (exit_reason_want == VMX_APIC_WRITE) { 5817 assert_exit_reason(exit_reason_want); 5818 report(virtual_apic_page[apic_reg_index(reg)] == val, 5819 "got APIC write exit @ page offset 0x%03x; val is 0x%x, want 0x%x", 5820 apic_reg_index(reg), 5821 virtual_apic_page[apic_reg_index(reg)], val); 5822 checked = true; 5823 5824 /* Reenter guest so it can consume/check rcx and exit again. */ 5825 enter_guest(); 5826 } else if (exit_reason_want != VMX_VMCALL) { 5827 report(false, "Oops, bad exit expectation: %u.", 5828 exit_reason_want); 5829 } 5830 5831 assert_exit_reason(VMX_VMCALL); 5832 if (virtualized && !checked) { 5833 u32 want = expectation->virt_fn(val); 5834 u32 got = virtual_apic_page[apic_reg_index(reg)]; 5835 got = expectation->virt_fn(got); 5836 5837 report(got == want, "exitless write; val is 0x%x, want 0x%x", 5838 got, want); 5839 } else if (!expectation->virtualize_apic_accesses && !checked) { 5840 u32 got = apic_access_address[apic_reg_index(reg)]; 5841 5842 report(got == val, 5843 "non-virtualized write; val is 0x%x, want 0x%x", got, 5844 val); 5845 } else if (!expectation->virtualize_apic_accesses && checked) { 5846 report(false, 5847 "Non-virtualized write was prematurely checked!"); 5848 } 5849 5850 skip_exit_vmcall(); 5851 report_prefix_pop(); 5852 } 5853 5854 enum Config_type { 5855 CONFIG_TYPE_GOOD, 5856 CONFIG_TYPE_UNSUPPORTED, 5857 CONFIG_TYPE_VMENTRY_FAILS_EARLY, 5858 }; 5859 5860 static enum Config_type configure_apic_reg_virt_test( 5861 struct apic_reg_virt_config *apic_reg_virt_config) 5862 { 5863 u32 cpu_exec_ctrl0 = vmcs_read(CPU_EXEC_CTRL0); 5864 u32 cpu_exec_ctrl1 = vmcs_read(CPU_EXEC_CTRL1); 5865 /* Configs where L2 entry fails early, due to invalid controls. */ 5866 bool use_tpr_shadow_incorrectly_off = 5867 !apic_reg_virt_config->use_tpr_shadow && 5868 (apic_reg_virt_config->apic_register_virtualization || 5869 apic_reg_virt_config->virtualize_x2apic_mode) && 5870 apic_reg_virt_config->activate_secondary_controls; 5871 bool virtualize_apic_accesses_incorrectly_on = 5872 apic_reg_virt_config->virtualize_apic_accesses && 5873 apic_reg_virt_config->virtualize_x2apic_mode && 5874 apic_reg_virt_config->activate_secondary_controls; 5875 bool vmentry_fails_early = 5876 use_tpr_shadow_incorrectly_off || 5877 virtualize_apic_accesses_incorrectly_on; 5878 5879 if (apic_reg_virt_config->activate_secondary_controls) { 5880 if (!(ctrl_cpu_rev[0].clr & CPU_SECONDARY)) { 5881 printf("VM-execution control \"activate secondary controls\" NOT supported.\n"); 5882 return CONFIG_TYPE_UNSUPPORTED; 5883 } 5884 cpu_exec_ctrl0 |= CPU_SECONDARY; 5885 } else { 5886 cpu_exec_ctrl0 &= ~CPU_SECONDARY; 5887 } 5888 5889 if (apic_reg_virt_config->virtualize_apic_accesses) { 5890 if (!(ctrl_cpu_rev[1].clr & CPU_VIRT_APIC_ACCESSES)) { 5891 printf("VM-execution control \"virtualize APIC accesses\" NOT supported.\n"); 5892 return CONFIG_TYPE_UNSUPPORTED; 5893 } 5894 cpu_exec_ctrl1 |= CPU_VIRT_APIC_ACCESSES; 5895 } else { 5896 cpu_exec_ctrl1 &= ~CPU_VIRT_APIC_ACCESSES; 5897 } 5898 5899 if (apic_reg_virt_config->use_tpr_shadow) { 5900 if (!(ctrl_cpu_rev[0].clr & CPU_TPR_SHADOW)) { 5901 printf("VM-execution control \"use TPR shadow\" NOT supported.\n"); 5902 return CONFIG_TYPE_UNSUPPORTED; 5903 } 5904 cpu_exec_ctrl0 |= CPU_TPR_SHADOW; 5905 } else { 5906 cpu_exec_ctrl0 &= ~CPU_TPR_SHADOW; 5907 } 5908 5909 if (apic_reg_virt_config->apic_register_virtualization) { 5910 if (!(ctrl_cpu_rev[1].clr & CPU_APIC_REG_VIRT)) { 5911 printf("VM-execution control \"APIC-register virtualization\" NOT supported.\n"); 5912 return CONFIG_TYPE_UNSUPPORTED; 5913 } 5914 cpu_exec_ctrl1 |= CPU_APIC_REG_VIRT; 5915 } else { 5916 cpu_exec_ctrl1 &= ~CPU_APIC_REG_VIRT; 5917 } 5918 5919 if (apic_reg_virt_config->virtualize_x2apic_mode) { 5920 if (!(ctrl_cpu_rev[1].clr & CPU_VIRT_X2APIC)) { 5921 printf("VM-execution control \"virtualize x2APIC mode\" NOT supported.\n"); 5922 return CONFIG_TYPE_UNSUPPORTED; 5923 } 5924 cpu_exec_ctrl1 |= CPU_VIRT_X2APIC; 5925 } else { 5926 cpu_exec_ctrl1 &= ~CPU_VIRT_X2APIC; 5927 } 5928 5929 vmcs_write(CPU_EXEC_CTRL0, cpu_exec_ctrl0); 5930 vmcs_write(CPU_EXEC_CTRL1, cpu_exec_ctrl1); 5931 5932 if (vmentry_fails_early) 5933 return CONFIG_TYPE_VMENTRY_FAILS_EARLY; 5934 5935 return CONFIG_TYPE_GOOD; 5936 } 5937 5938 static bool cpu_has_apicv(void) 5939 { 5940 return ((ctrl_cpu_rev[1].clr & CPU_APIC_REG_VIRT) && 5941 (ctrl_cpu_rev[1].clr & CPU_VINTD) && 5942 (ctrl_pin_rev.clr & PIN_POST_INTR)); 5943 } 5944 5945 /* Validates APIC register access across valid virtualization configurations. */ 5946 static void apic_reg_virt_test(void) 5947 { 5948 u32 *apic_access_address; 5949 u32 *virtual_apic_page; 5950 u64 control; 5951 u64 cpu_exec_ctrl0 = vmcs_read(CPU_EXEC_CTRL0); 5952 u64 cpu_exec_ctrl1 = vmcs_read(CPU_EXEC_CTRL1); 5953 int i; 5954 struct apic_reg_virt_guest_args *args = &apic_reg_virt_guest_args; 5955 5956 if (!cpu_has_apicv()) { 5957 report_skip(__func__); 5958 return; 5959 } 5960 5961 control = cpu_exec_ctrl1; 5962 control &= ~CPU_VINTD; 5963 vmcs_write(CPU_EXEC_CTRL1, control); 5964 5965 test_set_guest(apic_reg_virt_guest); 5966 5967 /* 5968 * From the SDM: The 1-setting of the "virtualize APIC accesses" 5969 * VM-execution is guaranteed to apply only if translations to the 5970 * APIC-access address use a 4-KByte page. 5971 */ 5972 apic_access_address = alloc_page(); 5973 force_4k_page(apic_access_address); 5974 vmcs_write(APIC_ACCS_ADDR, virt_to_phys(apic_access_address)); 5975 5976 virtual_apic_page = alloc_page(); 5977 vmcs_write(APIC_VIRT_ADDR, virt_to_phys(virtual_apic_page)); 5978 5979 for (i = 0; i < ARRAY_SIZE(apic_reg_tests); i++) { 5980 struct apic_reg_test *apic_reg_test = &apic_reg_tests[i]; 5981 struct apic_reg_virt_config *apic_reg_virt_config = 5982 &apic_reg_test->apic_reg_virt_config; 5983 enum Config_type config_type; 5984 u32 reg; 5985 5986 printf("--- %s test ---\n", apic_reg_test->name); 5987 config_type = 5988 configure_apic_reg_virt_test(apic_reg_virt_config); 5989 if (config_type == CONFIG_TYPE_UNSUPPORTED) { 5990 printf("Skip because of missing features.\n"); 5991 continue; 5992 } 5993 5994 if (config_type == CONFIG_TYPE_VMENTRY_FAILS_EARLY) { 5995 enter_guest_with_bad_controls(); 5996 continue; 5997 } 5998 5999 for (reg = 0; reg < PAGE_SIZE / sizeof(u32); reg += 0x10) { 6000 struct apic_reg_virt_expectation expectation = {}; 6001 bool ok; 6002 6003 ok = apic_reg_virt_exit_expectation( 6004 reg, apic_reg_virt_config, &expectation); 6005 if (!ok) { 6006 report(false, "Malformed test."); 6007 break; 6008 } 6009 6010 test_xapic_rd(reg, &expectation, apic_access_address, 6011 virtual_apic_page); 6012 test_xapic_wr(reg, &expectation, apic_access_address, 6013 virtual_apic_page); 6014 } 6015 } 6016 6017 /* Terminate the guest */ 6018 vmcs_write(CPU_EXEC_CTRL0, cpu_exec_ctrl0); 6019 vmcs_write(CPU_EXEC_CTRL1, cpu_exec_ctrl1); 6020 args->op = TERMINATE; 6021 enter_guest(); 6022 assert_exit_reason(VMX_VMCALL); 6023 } 6024 6025 struct virt_x2apic_mode_config { 6026 struct apic_reg_virt_config apic_reg_virt_config; 6027 bool virtual_interrupt_delivery; 6028 bool use_msr_bitmaps; 6029 bool disable_x2apic_msr_intercepts; 6030 bool disable_x2apic; 6031 }; 6032 6033 struct virt_x2apic_mode_test_case { 6034 const char *name; 6035 struct virt_x2apic_mode_config virt_x2apic_mode_config; 6036 }; 6037 6038 enum Virt_x2apic_mode_behavior_type { 6039 X2APIC_ACCESS_VIRTUALIZED, 6040 X2APIC_ACCESS_PASSED_THROUGH, 6041 X2APIC_ACCESS_TRIGGERS_GP, 6042 }; 6043 6044 struct virt_x2apic_mode_expectation { 6045 enum Reason rd_exit_reason; 6046 enum Reason wr_exit_reason; 6047 6048 /* 6049 * RDMSR and WRMSR handle 64-bit values. However, except for ICR, all of 6050 * the x2APIC registers are 32 bits. Notice: 6051 * 1. vmx_x2apic_read() clears the upper 32 bits for 32-bit registers. 6052 * 2. vmx_x2apic_write() expects the val arg to be well-formed. 6053 */ 6054 u64 rd_val; 6055 u64 wr_val; 6056 6057 /* 6058 * Compares input to virtualized output; 6059 * 1st arg is pointer to return expected virtualization output. 6060 */ 6061 u64 (*virt_fn)(u64); 6062 6063 enum Virt_x2apic_mode_behavior_type rd_behavior; 6064 enum Virt_x2apic_mode_behavior_type wr_behavior; 6065 bool wr_only; 6066 }; 6067 6068 static u64 virt_x2apic_mode_identity(u64 val) 6069 { 6070 return val; 6071 } 6072 6073 static u64 virt_x2apic_mode_nibble1(u64 val) 6074 { 6075 return val & 0xf0; 6076 } 6077 6078 static void virt_x2apic_mode_rd_expectation( 6079 u32 reg, bool virt_x2apic_mode_on, bool disable_x2apic, 6080 bool apic_register_virtualization, bool virtual_interrupt_delivery, 6081 struct virt_x2apic_mode_expectation *expectation) 6082 { 6083 bool readable = 6084 !x2apic_reg_reserved(reg) && 6085 reg != APIC_EOI; 6086 6087 expectation->rd_exit_reason = VMX_VMCALL; 6088 expectation->virt_fn = virt_x2apic_mode_identity; 6089 if (virt_x2apic_mode_on && apic_register_virtualization) { 6090 expectation->rd_val = MAGIC_VAL_1; 6091 if (reg == APIC_PROCPRI && virtual_interrupt_delivery) 6092 expectation->virt_fn = virt_x2apic_mode_nibble1; 6093 else if (reg == APIC_TASKPRI) 6094 expectation->virt_fn = virt_x2apic_mode_nibble1; 6095 expectation->rd_behavior = X2APIC_ACCESS_VIRTUALIZED; 6096 } else if (virt_x2apic_mode_on && !apic_register_virtualization && 6097 reg == APIC_TASKPRI) { 6098 expectation->rd_val = MAGIC_VAL_1; 6099 expectation->virt_fn = virt_x2apic_mode_nibble1; 6100 expectation->rd_behavior = X2APIC_ACCESS_VIRTUALIZED; 6101 } else if (!disable_x2apic && readable) { 6102 expectation->rd_val = apic_read(reg); 6103 expectation->rd_behavior = X2APIC_ACCESS_PASSED_THROUGH; 6104 } else { 6105 expectation->rd_behavior = X2APIC_ACCESS_TRIGGERS_GP; 6106 } 6107 } 6108 6109 /* 6110 * get_x2apic_wr_val() creates an innocuous write value for an x2APIC register. 6111 * 6112 * For writable registers, get_x2apic_wr_val() deposits the write value into the 6113 * val pointer arg and returns true. For non-writable registers, val is not 6114 * modified and get_x2apic_wr_val() returns false. 6115 */ 6116 static bool get_x2apic_wr_val(u32 reg, u64 *val) 6117 { 6118 switch (reg) { 6119 case APIC_TASKPRI: 6120 /* Bits 31:8 are reserved. */ 6121 *val &= 0xff; 6122 break; 6123 case APIC_EOI: 6124 case APIC_ESR: 6125 case APIC_TMICT: 6126 /* 6127 * EOI, ESR: WRMSR of a non-zero value causes #GP(0). 6128 * TMICT: A write of 0 to the initial-count register effectively 6129 * stops the local APIC timer, in both one-shot and 6130 * periodic mode. 6131 */ 6132 *val = 0; 6133 break; 6134 case APIC_SPIV: 6135 case APIC_LVTT: 6136 case APIC_LVTTHMR: 6137 case APIC_LVTPC: 6138 case APIC_LVT0: 6139 case APIC_LVT1: 6140 case APIC_LVTERR: 6141 case APIC_TDCR: 6142 /* 6143 * To avoid writing a 1 to a reserved bit or causing some other 6144 * unintended side effect, read the current value and use it as 6145 * the write value. 6146 */ 6147 *val = apic_read(reg); 6148 break; 6149 case APIC_CMCI: 6150 if (!apic_lvt_entry_supported(6)) 6151 return false; 6152 *val = apic_read(reg); 6153 break; 6154 case APIC_ICR: 6155 *val = 0x40000 | 0xf1; 6156 break; 6157 case APIC_SELF_IPI: 6158 /* 6159 * With special processing (i.e., virtualize x2APIC mode + 6160 * virtual interrupt delivery), writing zero causes an 6161 * APIC-write VM exit. We plan to add a test for enabling 6162 * "virtual-interrupt delivery" in VMCS12, and that's where we 6163 * will test a self IPI with special processing. 6164 */ 6165 *val = 0x0; 6166 break; 6167 default: 6168 return false; 6169 } 6170 6171 return true; 6172 } 6173 6174 static bool special_processing_applies(u32 reg, u64 *val, 6175 bool virt_int_delivery) 6176 { 6177 bool special_processing = 6178 (reg == APIC_TASKPRI) || 6179 (virt_int_delivery && 6180 (reg == APIC_EOI || reg == APIC_SELF_IPI)); 6181 6182 if (special_processing) { 6183 TEST_ASSERT(get_x2apic_wr_val(reg, val)); 6184 return true; 6185 } 6186 6187 return false; 6188 } 6189 6190 static void virt_x2apic_mode_wr_expectation( 6191 u32 reg, bool virt_x2apic_mode_on, bool disable_x2apic, 6192 bool virt_int_delivery, 6193 struct virt_x2apic_mode_expectation *expectation) 6194 { 6195 expectation->wr_exit_reason = VMX_VMCALL; 6196 expectation->wr_val = MAGIC_VAL_1; 6197 expectation->wr_only = false; 6198 6199 if (virt_x2apic_mode_on && 6200 special_processing_applies(reg, &expectation->wr_val, 6201 virt_int_delivery)) { 6202 expectation->wr_behavior = X2APIC_ACCESS_VIRTUALIZED; 6203 if (reg == APIC_SELF_IPI) 6204 expectation->wr_exit_reason = VMX_APIC_WRITE; 6205 } else if (!disable_x2apic && 6206 get_x2apic_wr_val(reg, &expectation->wr_val)) { 6207 expectation->wr_behavior = X2APIC_ACCESS_PASSED_THROUGH; 6208 if (reg == APIC_EOI || reg == APIC_SELF_IPI) 6209 expectation->wr_only = true; 6210 if (reg == APIC_ICR) 6211 expectation->wr_exit_reason = VMX_EXTINT; 6212 } else { 6213 expectation->wr_behavior = X2APIC_ACCESS_TRIGGERS_GP; 6214 /* 6215 * Writing 1 to a reserved bit triggers a #GP. 6216 * Thus, set the write value to 0, which seems 6217 * the most likely to detect a missed #GP. 6218 */ 6219 expectation->wr_val = 0; 6220 } 6221 } 6222 6223 static void virt_x2apic_mode_exit_expectation( 6224 u32 reg, struct virt_x2apic_mode_config *config, 6225 struct virt_x2apic_mode_expectation *expectation) 6226 { 6227 struct apic_reg_virt_config *base_config = 6228 &config->apic_reg_virt_config; 6229 bool virt_x2apic_mode_on = 6230 base_config->virtualize_x2apic_mode && 6231 config->use_msr_bitmaps && 6232 config->disable_x2apic_msr_intercepts && 6233 base_config->activate_secondary_controls; 6234 6235 virt_x2apic_mode_wr_expectation( 6236 reg, virt_x2apic_mode_on, config->disable_x2apic, 6237 config->virtual_interrupt_delivery, expectation); 6238 virt_x2apic_mode_rd_expectation( 6239 reg, virt_x2apic_mode_on, config->disable_x2apic, 6240 base_config->apic_register_virtualization, 6241 config->virtual_interrupt_delivery, expectation); 6242 } 6243 6244 struct virt_x2apic_mode_test_case virt_x2apic_mode_tests[] = { 6245 /* 6246 * Baseline "virtualize x2APIC mode" configuration: 6247 * - virtualize x2APIC mode 6248 * - virtual-interrupt delivery 6249 * - APIC-register virtualization 6250 * - x2APIC MSR intercepts disabled 6251 * 6252 * Reads come from virtual APIC page, special processing applies to 6253 * VTPR, EOI, and SELF IPI, and all other writes pass through to L1 6254 * APIC. 6255 */ 6256 { 6257 .name = "Baseline", 6258 .virt_x2apic_mode_config = { 6259 .virtual_interrupt_delivery = true, 6260 .use_msr_bitmaps = true, 6261 .disable_x2apic_msr_intercepts = true, 6262 .disable_x2apic = false, 6263 .apic_reg_virt_config = { 6264 .apic_register_virtualization = true, 6265 .use_tpr_shadow = true, 6266 .virtualize_apic_accesses = false, 6267 .virtualize_x2apic_mode = true, 6268 .activate_secondary_controls = true, 6269 }, 6270 }, 6271 }, 6272 { 6273 .name = "Baseline w/ x2apic disabled", 6274 .virt_x2apic_mode_config = { 6275 .virtual_interrupt_delivery = true, 6276 .use_msr_bitmaps = true, 6277 .disable_x2apic_msr_intercepts = true, 6278 .disable_x2apic = true, 6279 .apic_reg_virt_config = { 6280 .apic_register_virtualization = true, 6281 .use_tpr_shadow = true, 6282 .virtualize_apic_accesses = false, 6283 .virtualize_x2apic_mode = true, 6284 .activate_secondary_controls = true, 6285 }, 6286 }, 6287 }, 6288 6289 /* 6290 * Baseline, minus virtual-interrupt delivery. Reads come from virtual 6291 * APIC page, special processing applies to VTPR, and all other writes 6292 * pass through to L1 APIC. 6293 */ 6294 { 6295 .name = "Baseline - virtual interrupt delivery", 6296 .virt_x2apic_mode_config = { 6297 .virtual_interrupt_delivery = false, 6298 .use_msr_bitmaps = true, 6299 .disable_x2apic_msr_intercepts = true, 6300 .disable_x2apic = false, 6301 .apic_reg_virt_config = { 6302 .apic_register_virtualization = true, 6303 .use_tpr_shadow = true, 6304 .virtualize_apic_accesses = false, 6305 .virtualize_x2apic_mode = true, 6306 .activate_secondary_controls = true, 6307 }, 6308 }, 6309 }, 6310 6311 /* 6312 * Baseline, minus APIC-register virtualization. x2APIC reads pass 6313 * through to L1's APIC, unless reading VTPR 6314 */ 6315 { 6316 .name = "Virtualize x2APIC mode, no APIC reg virt", 6317 .virt_x2apic_mode_config = { 6318 .virtual_interrupt_delivery = true, 6319 .use_msr_bitmaps = true, 6320 .disable_x2apic_msr_intercepts = true, 6321 .disable_x2apic = false, 6322 .apic_reg_virt_config = { 6323 .apic_register_virtualization = false, 6324 .use_tpr_shadow = true, 6325 .virtualize_apic_accesses = false, 6326 .virtualize_x2apic_mode = true, 6327 .activate_secondary_controls = true, 6328 }, 6329 }, 6330 }, 6331 { 6332 .name = "Virtualize x2APIC mode, no APIC reg virt, x2APIC off", 6333 .virt_x2apic_mode_config = { 6334 .virtual_interrupt_delivery = true, 6335 .use_msr_bitmaps = true, 6336 .disable_x2apic_msr_intercepts = true, 6337 .disable_x2apic = true, 6338 .apic_reg_virt_config = { 6339 .apic_register_virtualization = false, 6340 .use_tpr_shadow = true, 6341 .virtualize_apic_accesses = false, 6342 .virtualize_x2apic_mode = true, 6343 .activate_secondary_controls = true, 6344 }, 6345 }, 6346 }, 6347 6348 /* 6349 * Enable "virtualize x2APIC mode" and "APIC-register virtualization", 6350 * and disable intercepts for the x2APIC MSRs, but fail to enable 6351 * "activate secondary controls" (i.e. L2 gets access to L1's x2APIC 6352 * MSRs). 6353 */ 6354 { 6355 .name = "Fail to enable activate secondary controls", 6356 .virt_x2apic_mode_config = { 6357 .virtual_interrupt_delivery = true, 6358 .use_msr_bitmaps = true, 6359 .disable_x2apic_msr_intercepts = true, 6360 .disable_x2apic = false, 6361 .apic_reg_virt_config = { 6362 .apic_register_virtualization = true, 6363 .use_tpr_shadow = true, 6364 .virtualize_apic_accesses = false, 6365 .virtualize_x2apic_mode = true, 6366 .activate_secondary_controls = false, 6367 }, 6368 }, 6369 }, 6370 6371 /* 6372 * Enable "APIC-register virtualization" and enable "activate secondary 6373 * controls" and disable intercepts for the x2APIC MSRs, but do not 6374 * enable the "virtualize x2APIC mode" VM-execution control (i.e. L2 6375 * gets access to L1's x2APIC MSRs). 6376 */ 6377 { 6378 .name = "Fail to enable virtualize x2APIC mode", 6379 .virt_x2apic_mode_config = { 6380 .virtual_interrupt_delivery = true, 6381 .use_msr_bitmaps = true, 6382 .disable_x2apic_msr_intercepts = true, 6383 .disable_x2apic = false, 6384 .apic_reg_virt_config = { 6385 .apic_register_virtualization = true, 6386 .use_tpr_shadow = true, 6387 .virtualize_apic_accesses = false, 6388 .virtualize_x2apic_mode = false, 6389 .activate_secondary_controls = true, 6390 }, 6391 }, 6392 }, 6393 6394 /* 6395 * Disable "Virtualize x2APIC mode", disable x2APIC MSR intercepts, and 6396 * enable "APIC-register virtualization" --> L2 gets L1's x2APIC MSRs. 6397 */ 6398 { 6399 .name = "Baseline", 6400 .virt_x2apic_mode_config = { 6401 .virtual_interrupt_delivery = true, 6402 .use_msr_bitmaps = true, 6403 .disable_x2apic_msr_intercepts = true, 6404 .disable_x2apic = false, 6405 .apic_reg_virt_config = { 6406 .apic_register_virtualization = true, 6407 .use_tpr_shadow = true, 6408 .virtualize_apic_accesses = false, 6409 .virtualize_x2apic_mode = false, 6410 .activate_secondary_controls = true, 6411 }, 6412 }, 6413 }, 6414 }; 6415 6416 enum X2apic_op { 6417 X2APIC_OP_RD, 6418 X2APIC_OP_WR, 6419 X2APIC_TERMINATE, 6420 }; 6421 6422 static u64 vmx_x2apic_read(u32 reg) 6423 { 6424 u32 msr_addr = x2apic_msr(reg); 6425 u64 val; 6426 6427 val = rdmsr(msr_addr); 6428 6429 return val; 6430 } 6431 6432 static void vmx_x2apic_write(u32 reg, u64 val) 6433 { 6434 u32 msr_addr = x2apic_msr(reg); 6435 6436 wrmsr(msr_addr, val); 6437 } 6438 6439 struct virt_x2apic_mode_guest_args { 6440 enum X2apic_op op; 6441 u32 reg; 6442 u64 val; 6443 bool should_gp; 6444 u64 (*virt_fn)(u64); 6445 } virt_x2apic_mode_guest_args; 6446 6447 static volatile bool handle_x2apic_gp_ran; 6448 static volatile u32 handle_x2apic_gp_insn_len; 6449 static void handle_x2apic_gp(struct ex_regs *regs) 6450 { 6451 handle_x2apic_gp_ran = true; 6452 regs->rip += handle_x2apic_gp_insn_len; 6453 } 6454 6455 static handler setup_x2apic_gp_handler(void) 6456 { 6457 handler old_handler; 6458 6459 old_handler = handle_exception(GP_VECTOR, handle_x2apic_gp); 6460 /* RDMSR and WRMSR are both 2 bytes, assuming no prefixes. */ 6461 handle_x2apic_gp_insn_len = 2; 6462 6463 return old_handler; 6464 } 6465 6466 static void teardown_x2apic_gp_handler(handler old_handler) 6467 { 6468 handle_exception(GP_VECTOR, old_handler); 6469 6470 /* 6471 * Defensively reset instruction length, so that if the handler is 6472 * incorrectly used, it will loop infinitely, rather than run off into 6473 * la la land. 6474 */ 6475 handle_x2apic_gp_insn_len = 0; 6476 handle_x2apic_gp_ran = false; 6477 } 6478 6479 static void virt_x2apic_mode_guest(void) 6480 { 6481 volatile struct virt_x2apic_mode_guest_args *args = 6482 &virt_x2apic_mode_guest_args; 6483 6484 for (;;) { 6485 enum X2apic_op op = args->op; 6486 u32 reg = args->reg; 6487 u64 val = args->val; 6488 bool should_gp = args->should_gp; 6489 u64 (*virt_fn)(u64) = args->virt_fn; 6490 handler old_handler; 6491 6492 if (op == X2APIC_TERMINATE) 6493 break; 6494 6495 if (should_gp) { 6496 TEST_ASSERT(!handle_x2apic_gp_ran); 6497 old_handler = setup_x2apic_gp_handler(); 6498 } 6499 6500 if (op == X2APIC_OP_RD) { 6501 u64 ret = vmx_x2apic_read(reg); 6502 6503 if (!should_gp) { 6504 u64 want = virt_fn(val); 6505 u64 got = virt_fn(ret); 6506 6507 report(got == want, 6508 "APIC read; got 0x%lx, want 0x%lx.", 6509 got, want); 6510 } 6511 } else if (op == X2APIC_OP_WR) { 6512 vmx_x2apic_write(reg, val); 6513 } 6514 6515 if (should_gp) { 6516 report(handle_x2apic_gp_ran, 6517 "x2APIC op triggered GP."); 6518 teardown_x2apic_gp_handler(old_handler); 6519 } 6520 6521 /* 6522 * The L1 should always execute a vmcall after it's done testing 6523 * an individual APIC operation. This helps to validate that the 6524 * L1 and L2 are in sync with each other, as expected. 6525 */ 6526 vmcall(); 6527 } 6528 } 6529 6530 static void test_x2apic_rd( 6531 u32 reg, struct virt_x2apic_mode_expectation *expectation, 6532 u32 *virtual_apic_page) 6533 { 6534 u64 val = expectation->rd_val; 6535 u32 exit_reason_want = expectation->rd_exit_reason; 6536 struct virt_x2apic_mode_guest_args *args = &virt_x2apic_mode_guest_args; 6537 6538 report_prefix_pushf("x2apic - reading 0x%03x", reg); 6539 6540 /* Configure guest to do an x2apic read */ 6541 args->op = X2APIC_OP_RD; 6542 args->reg = reg; 6543 args->val = val; 6544 args->should_gp = expectation->rd_behavior == X2APIC_ACCESS_TRIGGERS_GP; 6545 args->virt_fn = expectation->virt_fn; 6546 6547 /* Setup virtual APIC page */ 6548 if (expectation->rd_behavior == X2APIC_ACCESS_VIRTUALIZED) 6549 virtual_apic_page[apic_reg_index(reg)] = (u32)val; 6550 6551 /* Enter guest */ 6552 enter_guest(); 6553 6554 if (exit_reason_want != VMX_VMCALL) { 6555 report(false, "Oops, bad exit expectation: %u.", 6556 exit_reason_want); 6557 } 6558 6559 skip_exit_vmcall(); 6560 report_prefix_pop(); 6561 } 6562 6563 static volatile bool handle_x2apic_ipi_ran; 6564 static void handle_x2apic_ipi(isr_regs_t *regs) 6565 { 6566 handle_x2apic_ipi_ran = true; 6567 eoi(); 6568 } 6569 6570 static void test_x2apic_wr( 6571 u32 reg, struct virt_x2apic_mode_expectation *expectation, 6572 u32 *virtual_apic_page) 6573 { 6574 u64 val = expectation->wr_val; 6575 u32 exit_reason_want = expectation->wr_exit_reason; 6576 struct virt_x2apic_mode_guest_args *args = &virt_x2apic_mode_guest_args; 6577 int ipi_vector = 0xf1; 6578 u32 restore_val = 0; 6579 6580 report_prefix_pushf("x2apic - writing 0x%lx to 0x%03x", val, reg); 6581 6582 /* Configure guest to do an x2apic read */ 6583 args->op = X2APIC_OP_WR; 6584 args->reg = reg; 6585 args->val = val; 6586 args->should_gp = expectation->wr_behavior == X2APIC_ACCESS_TRIGGERS_GP; 6587 6588 /* Setup virtual APIC page */ 6589 if (expectation->wr_behavior == X2APIC_ACCESS_VIRTUALIZED) 6590 virtual_apic_page[apic_reg_index(reg)] = 0; 6591 if (expectation->wr_behavior == X2APIC_ACCESS_PASSED_THROUGH && !expectation->wr_only) 6592 restore_val = apic_read(reg); 6593 6594 /* Setup IPI handler */ 6595 handle_x2apic_ipi_ran = false; 6596 handle_irq(ipi_vector, handle_x2apic_ipi); 6597 6598 /* Enter guest */ 6599 enter_guest(); 6600 6601 /* 6602 * Validate the behavior and 6603 * pass a magic value back to the guest. 6604 */ 6605 if (exit_reason_want == VMX_EXTINT) { 6606 assert_exit_reason(exit_reason_want); 6607 6608 /* Clear the external interrupt. */ 6609 irq_enable(); 6610 asm volatile ("nop"); 6611 irq_disable(); 6612 report(handle_x2apic_ipi_ran, 6613 "Got pending interrupt after IRQ enabled."); 6614 6615 enter_guest(); 6616 } else if (exit_reason_want == VMX_APIC_WRITE) { 6617 assert_exit_reason(exit_reason_want); 6618 report(virtual_apic_page[apic_reg_index(reg)] == val, 6619 "got APIC write exit @ page offset 0x%03x; val is 0x%x, want 0x%lx", 6620 apic_reg_index(reg), 6621 virtual_apic_page[apic_reg_index(reg)], val); 6622 6623 /* Reenter guest so it can consume/check rcx and exit again. */ 6624 enter_guest(); 6625 } else if (exit_reason_want != VMX_VMCALL) { 6626 report(false, "Oops, bad exit expectation: %u.", 6627 exit_reason_want); 6628 } 6629 6630 assert_exit_reason(VMX_VMCALL); 6631 if (expectation->wr_behavior == X2APIC_ACCESS_VIRTUALIZED) { 6632 u64 want = val; 6633 u32 got = virtual_apic_page[apic_reg_index(reg)]; 6634 6635 report(got == want, "x2APIC write; got 0x%x, want 0x%lx", got, 6636 want); 6637 } else if (expectation->wr_behavior == X2APIC_ACCESS_PASSED_THROUGH) { 6638 if (!expectation->wr_only) { 6639 u32 got = apic_read(reg); 6640 bool ok; 6641 6642 /* 6643 * When L1's TPR is passed through to L2, the lower 6644 * nibble can be lost. For example, if L2 executes 6645 * WRMSR(0x808, 0x78), then, L1 might read 0x70. 6646 * 6647 * Here's how the lower nibble can get lost: 6648 * 1. L2 executes WRMSR(0x808, 0x78). 6649 * 2. L2 exits to L0 with a WRMSR exit. 6650 * 3. L0 emulates WRMSR, by writing L1's TPR. 6651 * 4. L0 re-enters L2. 6652 * 5. L2 exits to L0 (reason doesn't matter). 6653 * 6. L0 reflects L2's exit to L1. 6654 * 7. Before entering L1, L0 exits to user-space 6655 * (e.g., to satisfy TPR access reporting). 6656 * 8. User-space executes KVM_SET_REGS ioctl, which 6657 * clears the lower nibble of L1's TPR. 6658 */ 6659 if (reg == APIC_TASKPRI) { 6660 got = apic_virt_nibble1(got); 6661 val = apic_virt_nibble1(val); 6662 } 6663 6664 ok = got == val; 6665 report(ok, 6666 "non-virtualized write; val is 0x%x, want 0x%lx", 6667 got, val); 6668 apic_write(reg, restore_val); 6669 } else { 6670 report(true, "non-virtualized and write-only OK"); 6671 } 6672 } 6673 skip_exit_insn(); 6674 6675 report_prefix_pop(); 6676 } 6677 6678 static enum Config_type configure_virt_x2apic_mode_test( 6679 struct virt_x2apic_mode_config *virt_x2apic_mode_config, 6680 u8 *msr_bitmap_page) 6681 { 6682 int msr; 6683 u32 cpu_exec_ctrl0 = vmcs_read(CPU_EXEC_CTRL0); 6684 u64 cpu_exec_ctrl1 = vmcs_read(CPU_EXEC_CTRL1); 6685 6686 /* x2apic-specific VMCS config */ 6687 if (virt_x2apic_mode_config->use_msr_bitmaps) { 6688 /* virt_x2apic_mode_test() checks for MSR bitmaps support */ 6689 cpu_exec_ctrl0 |= CPU_MSR_BITMAP; 6690 } else { 6691 cpu_exec_ctrl0 &= ~CPU_MSR_BITMAP; 6692 } 6693 6694 if (virt_x2apic_mode_config->virtual_interrupt_delivery) { 6695 if (!(ctrl_cpu_rev[1].clr & CPU_VINTD)) { 6696 report_skip("VM-execution control \"virtual-interrupt delivery\" NOT supported.\n"); 6697 return CONFIG_TYPE_UNSUPPORTED; 6698 } 6699 cpu_exec_ctrl1 |= CPU_VINTD; 6700 } else { 6701 cpu_exec_ctrl1 &= ~CPU_VINTD; 6702 } 6703 6704 vmcs_write(CPU_EXEC_CTRL0, cpu_exec_ctrl0); 6705 vmcs_write(CPU_EXEC_CTRL1, cpu_exec_ctrl1); 6706 6707 /* x2APIC MSR intercepts are usually off for "Virtualize x2APIC mode" */ 6708 for (msr = 0x800; msr <= 0x8ff; msr++) { 6709 if (virt_x2apic_mode_config->disable_x2apic_msr_intercepts) { 6710 clear_bit(msr, msr_bitmap_page + 0x000); 6711 clear_bit(msr, msr_bitmap_page + 0x800); 6712 } else { 6713 set_bit(msr, msr_bitmap_page + 0x000); 6714 set_bit(msr, msr_bitmap_page + 0x800); 6715 } 6716 } 6717 6718 /* x2APIC mode can impact virtualization */ 6719 reset_apic(); 6720 if (!virt_x2apic_mode_config->disable_x2apic) 6721 enable_x2apic(); 6722 6723 return configure_apic_reg_virt_test( 6724 &virt_x2apic_mode_config->apic_reg_virt_config); 6725 } 6726 6727 static void virt_x2apic_mode_test(void) 6728 { 6729 u32 *virtual_apic_page; 6730 u8 *msr_bitmap_page; 6731 u64 cpu_exec_ctrl0 = vmcs_read(CPU_EXEC_CTRL0); 6732 u64 cpu_exec_ctrl1 = vmcs_read(CPU_EXEC_CTRL1); 6733 int i; 6734 struct virt_x2apic_mode_guest_args *args = &virt_x2apic_mode_guest_args; 6735 6736 if (!cpu_has_apicv()) { 6737 report_skip(__func__); 6738 return; 6739 } 6740 6741 /* 6742 * This is to exercise an issue in KVM's logic to merge L0's and L1's 6743 * MSR bitmaps. Previously, an L1 could get at L0's x2APIC MSRs by 6744 * writing the IA32_SPEC_CTRL MSR or the IA32_PRED_CMD MSRs. KVM would 6745 * then proceed to manipulate the MSR bitmaps, as if VMCS12 had the 6746 * "Virtualize x2APIC mod" control set, even when it didn't. 6747 */ 6748 if (has_spec_ctrl()) 6749 wrmsr(MSR_IA32_SPEC_CTRL, 1); 6750 6751 /* 6752 * Check that VMCS12 supports: 6753 * - "Virtual-APIC address", indicated by "use TPR shadow" 6754 * - "MSR-bitmap address", indicated by "use MSR bitmaps" 6755 */ 6756 if (!(ctrl_cpu_rev[0].clr & CPU_TPR_SHADOW)) { 6757 report_skip("VM-execution control \"use TPR shadow\" NOT supported.\n"); 6758 return; 6759 } else if (!(ctrl_cpu_rev[0].clr & CPU_MSR_BITMAP)) { 6760 report_skip("VM-execution control \"use MSR bitmaps\" NOT supported.\n"); 6761 return; 6762 } 6763 6764 test_set_guest(virt_x2apic_mode_guest); 6765 6766 virtual_apic_page = alloc_page(); 6767 vmcs_write(APIC_VIRT_ADDR, virt_to_phys(virtual_apic_page)); 6768 6769 msr_bitmap_page = alloc_page(); 6770 memset(msr_bitmap_page, 0xff, PAGE_SIZE); 6771 vmcs_write(MSR_BITMAP, virt_to_phys(msr_bitmap_page)); 6772 6773 for (i = 0; i < ARRAY_SIZE(virt_x2apic_mode_tests); i++) { 6774 struct virt_x2apic_mode_test_case *virt_x2apic_mode_test_case = 6775 &virt_x2apic_mode_tests[i]; 6776 struct virt_x2apic_mode_config *virt_x2apic_mode_config = 6777 &virt_x2apic_mode_test_case->virt_x2apic_mode_config; 6778 enum Config_type config_type; 6779 u32 reg; 6780 6781 printf("--- %s test ---\n", virt_x2apic_mode_test_case->name); 6782 config_type = 6783 configure_virt_x2apic_mode_test(virt_x2apic_mode_config, 6784 msr_bitmap_page); 6785 if (config_type == CONFIG_TYPE_UNSUPPORTED) { 6786 report_skip("Skip because of missing features.\n"); 6787 continue; 6788 } else if (config_type == CONFIG_TYPE_VMENTRY_FAILS_EARLY) { 6789 enter_guest_with_bad_controls(); 6790 continue; 6791 } 6792 6793 for (reg = 0; reg < PAGE_SIZE / sizeof(u32); reg += 0x10) { 6794 struct virt_x2apic_mode_expectation expectation; 6795 6796 virt_x2apic_mode_exit_expectation( 6797 reg, virt_x2apic_mode_config, &expectation); 6798 6799 test_x2apic_rd(reg, &expectation, virtual_apic_page); 6800 test_x2apic_wr(reg, &expectation, virtual_apic_page); 6801 } 6802 } 6803 6804 6805 /* Terminate the guest */ 6806 vmcs_write(CPU_EXEC_CTRL0, cpu_exec_ctrl0); 6807 vmcs_write(CPU_EXEC_CTRL1, cpu_exec_ctrl1); 6808 args->op = X2APIC_TERMINATE; 6809 enter_guest(); 6810 assert_exit_reason(VMX_VMCALL); 6811 } 6812 6813 static void test_ctl_reg(const char *cr_name, u64 cr, u64 fixed0, u64 fixed1) 6814 { 6815 u64 val; 6816 u64 cr_saved = vmcs_read(cr); 6817 int i; 6818 6819 val = fixed0 & fixed1; 6820 if (cr == HOST_CR4) 6821 vmcs_write(cr, val | X86_CR4_PAE); 6822 else 6823 vmcs_write(cr, val); 6824 report_prefix_pushf("%s %lx", cr_name, val); 6825 if (val == fixed0) 6826 test_vmx_vmlaunch(0); 6827 else 6828 test_vmx_vmlaunch(VMXERR_ENTRY_INVALID_HOST_STATE_FIELD); 6829 report_prefix_pop(); 6830 6831 for (i = 0; i < 64; i++) { 6832 6833 /* Set a bit when the corresponding bit in fixed1 is 0 */ 6834 if ((fixed1 & (1ull << i)) == 0) { 6835 if (cr == HOST_CR4 && ((1ull << i) & X86_CR4_SMEP || 6836 (1ull << i) & X86_CR4_SMAP)) 6837 continue; 6838 6839 vmcs_write(cr, cr_saved | (1ull << i)); 6840 report_prefix_pushf("%s %llx", cr_name, 6841 cr_saved | (1ull << i)); 6842 test_vmx_vmlaunch( 6843 VMXERR_ENTRY_INVALID_HOST_STATE_FIELD); 6844 report_prefix_pop(); 6845 } 6846 6847 /* Unset a bit when the corresponding bit in fixed0 is 1 */ 6848 if (fixed0 & (1ull << i)) { 6849 vmcs_write(cr, cr_saved & ~(1ull << i)); 6850 report_prefix_pushf("%s %llx", cr_name, 6851 cr_saved & ~(1ull << i)); 6852 test_vmx_vmlaunch( 6853 VMXERR_ENTRY_INVALID_HOST_STATE_FIELD); 6854 report_prefix_pop(); 6855 } 6856 } 6857 6858 vmcs_write(cr, cr_saved); 6859 } 6860 6861 /* 6862 * 1. The CR0 field must not set any bit to a value not supported in VMX 6863 * operation. 6864 * 2. The CR4 field must not set any bit to a value not supported in VMX 6865 * operation. 6866 * 3. On processors that support Intel 64 architecture, the CR3 field must 6867 * be such that bits 63:52 and bits in the range 51:32 beyond the 6868 * processor’s physical-address width must be 0. 6869 * 6870 * [Intel SDM] 6871 */ 6872 static void test_host_ctl_regs(void) 6873 { 6874 u64 fixed0, fixed1, cr3, cr3_saved; 6875 int i; 6876 6877 /* Test CR0 */ 6878 fixed0 = rdmsr(MSR_IA32_VMX_CR0_FIXED0); 6879 fixed1 = rdmsr(MSR_IA32_VMX_CR0_FIXED1); 6880 test_ctl_reg("HOST_CR0", HOST_CR0, fixed0, fixed1); 6881 6882 /* Test CR4 */ 6883 fixed0 = rdmsr(MSR_IA32_VMX_CR4_FIXED0); 6884 fixed1 = rdmsr(MSR_IA32_VMX_CR4_FIXED1) & 6885 ~(X86_CR4_SMEP | X86_CR4_SMAP); 6886 test_ctl_reg("HOST_CR4", HOST_CR4, fixed0, fixed1); 6887 6888 /* Test CR3 */ 6889 cr3_saved = vmcs_read(HOST_CR3); 6890 for (i = cpuid_maxphyaddr(); i < 64; i++) { 6891 cr3 = cr3_saved | (1ul << i); 6892 vmcs_write(HOST_CR3, cr3); 6893 report_prefix_pushf("HOST_CR3 %lx", cr3); 6894 test_vmx_vmlaunch(VMXERR_ENTRY_INVALID_HOST_STATE_FIELD); 6895 report_prefix_pop(); 6896 } 6897 6898 vmcs_write(HOST_CR3, cr3_saved); 6899 } 6900 6901 static void test_efer_vmlaunch(u32 fld, bool ok) 6902 { 6903 if (fld == HOST_EFER) { 6904 if (ok) 6905 test_vmx_vmlaunch(0); 6906 else 6907 test_vmx_vmlaunch2(VMXERR_ENTRY_INVALID_CONTROL_FIELD, 6908 VMXERR_ENTRY_INVALID_HOST_STATE_FIELD); 6909 } else { 6910 test_guest_state("EFER test", !ok, GUEST_EFER, "GUEST_EFER"); 6911 } 6912 } 6913 6914 static void test_efer_one(u32 fld, const char * fld_name, u64 efer, 6915 u32 ctrl_fld, u64 ctrl, 6916 int i, const char *efer_bit_name) 6917 { 6918 bool ok; 6919 6920 ok = true; 6921 if (ctrl_fld == EXI_CONTROLS && (ctrl & EXI_LOAD_EFER)) { 6922 if (!!(efer & EFER_LMA) != !!(ctrl & EXI_HOST_64)) 6923 ok = false; 6924 if (!!(efer & EFER_LME) != !!(ctrl & EXI_HOST_64)) 6925 ok = false; 6926 } 6927 if (ctrl_fld == ENT_CONTROLS && (ctrl & ENT_LOAD_EFER)) { 6928 /* Check LMA too since CR0.PG is set. */ 6929 if (!!(efer & EFER_LMA) != !!(ctrl & ENT_GUEST_64)) 6930 ok = false; 6931 if (!!(efer & EFER_LME) != !!(ctrl & ENT_GUEST_64)) 6932 ok = false; 6933 } 6934 6935 /* 6936 * Skip the test if it would enter the guest in 32-bit mode. 6937 * Perhaps write the test in assembly and make sure it 6938 * can be run in either mode? 6939 */ 6940 if (fld == GUEST_EFER && ok && !(ctrl & ENT_GUEST_64)) 6941 return; 6942 6943 vmcs_write(ctrl_fld, ctrl); 6944 vmcs_write(fld, efer); 6945 report_prefix_pushf("%s %s bit turned %s, controls %s", 6946 fld_name, efer_bit_name, 6947 (i & 1) ? "on" : "off", 6948 (i & 2) ? "on" : "off"); 6949 6950 test_efer_vmlaunch(fld, ok); 6951 report_prefix_pop(); 6952 } 6953 6954 static void test_efer_bit(u32 fld, const char * fld_name, 6955 u32 ctrl_fld, u64 ctrl_bit, u64 efer_bit, 6956 const char *efer_bit_name) 6957 { 6958 u64 efer_saved = vmcs_read(fld); 6959 u32 ctrl_saved = vmcs_read(ctrl_fld); 6960 int i; 6961 6962 for (i = 0; i < 4; i++) { 6963 u64 efer = efer_saved & ~efer_bit; 6964 u64 ctrl = ctrl_saved & ~ctrl_bit; 6965 6966 if (i & 1) 6967 efer |= efer_bit; 6968 if (i & 2) 6969 ctrl |= ctrl_bit; 6970 6971 test_efer_one(fld, fld_name, efer, ctrl_fld, ctrl, 6972 i, efer_bit_name); 6973 } 6974 6975 vmcs_write(ctrl_fld, ctrl_saved); 6976 vmcs_write(fld, efer_saved); 6977 } 6978 6979 static void test_efer(u32 fld, const char * fld_name, u32 ctrl_fld, 6980 u64 ctrl_bit1, u64 ctrl_bit2) 6981 { 6982 u64 efer_saved = vmcs_read(fld); 6983 u32 ctrl_saved = vmcs_read(ctrl_fld); 6984 u64 efer_reserved_bits = ~((u64)(EFER_SCE | EFER_LME | EFER_LMA)); 6985 u64 i; 6986 u64 efer; 6987 6988 if (cpu_has_efer_nx()) 6989 efer_reserved_bits &= ~EFER_NX; 6990 6991 if (!ctrl_bit1) { 6992 printf("\"Load-IA32-EFER\" exit control not supported\n"); 6993 goto test_entry_exit_mode; 6994 } 6995 6996 report_prefix_pushf("%s %lx", fld_name, efer_saved); 6997 test_efer_vmlaunch(fld, true); 6998 report_prefix_pop(); 6999 7000 /* 7001 * Check reserved bits 7002 */ 7003 vmcs_write(ctrl_fld, ctrl_saved & ~ctrl_bit1); 7004 for (i = 0; i < 64; i++) { 7005 if ((1ull << i) & efer_reserved_bits) { 7006 efer = efer_saved | (1ull << i); 7007 vmcs_write(fld, efer); 7008 report_prefix_pushf("%s %lx", fld_name, efer); 7009 test_efer_vmlaunch(fld, true); 7010 report_prefix_pop(); 7011 } 7012 } 7013 7014 vmcs_write(ctrl_fld, ctrl_saved | ctrl_bit1); 7015 for (i = 0; i < 64; i++) { 7016 if ((1ull << i) & efer_reserved_bits) { 7017 efer = efer_saved | (1ull << i); 7018 vmcs_write(fld, efer); 7019 report_prefix_pushf("%s %lx", fld_name, efer); 7020 test_efer_vmlaunch(fld, false); 7021 report_prefix_pop(); 7022 } 7023 } 7024 7025 vmcs_write(ctrl_fld, ctrl_saved); 7026 vmcs_write(fld, efer_saved); 7027 7028 /* 7029 * Check LMA and LME bits 7030 */ 7031 test_efer_bit(fld, fld_name, 7032 ctrl_fld, ctrl_bit1, 7033 EFER_LMA, 7034 "EFER_LMA"); 7035 test_efer_bit(fld, fld_name, 7036 ctrl_fld, ctrl_bit1, 7037 EFER_LME, 7038 "EFER_LME"); 7039 7040 test_entry_exit_mode: 7041 test_efer_bit(fld, fld_name, 7042 ctrl_fld, ctrl_bit2, 7043 EFER_LMA, 7044 "EFER_LMA"); 7045 test_efer_bit(fld, fld_name, 7046 ctrl_fld, ctrl_bit2, 7047 EFER_LME, 7048 "EFER_LME"); 7049 } 7050 7051 /* 7052 * If the 'load IA32_EFER' VM-exit control is 1, bits reserved in the 7053 * IA32_EFER MSR must be 0 in the field for that register. In addition, 7054 * the values of the LMA and LME bits in the field must each be that of 7055 * the 'host address-space size' VM-exit control. 7056 * 7057 * [Intel SDM] 7058 */ 7059 static void test_host_efer(void) 7060 { 7061 test_efer(HOST_EFER, "HOST_EFER", EXI_CONTROLS, 7062 ctrl_exit_rev.clr & EXI_LOAD_EFER, 7063 EXI_HOST_64); 7064 } 7065 7066 /* 7067 * If the 'load IA32_EFER' VM-enter control is 1, bits reserved in the 7068 * IA32_EFER MSR must be 0 in the field for that register. In addition, 7069 * the values of the LMA and LME bits in the field must each be that of 7070 * the 'IA32e-mode guest' VM-exit control. 7071 */ 7072 static void test_guest_efer(void) 7073 { 7074 if (!(ctrl_enter_rev.clr & ENT_LOAD_EFER)) { 7075 printf("\"Load-IA32-EFER\" entry control not supported\n"); 7076 return; 7077 } 7078 7079 vmcs_write(GUEST_EFER, rdmsr(MSR_EFER)); 7080 test_efer(GUEST_EFER, "GUEST_EFER", ENT_CONTROLS, 7081 ctrl_enter_rev.clr & ENT_LOAD_EFER, 7082 ENT_GUEST_64); 7083 } 7084 7085 /* 7086 * PAT values higher than 8 are uninteresting since they're likely lumped 7087 * in with "8". We only test values above 8 one bit at a time, 7088 * in order to reduce the number of VM-Entries and keep the runtime reasonable. 7089 */ 7090 #define PAT_VAL_LIMIT 8 7091 7092 static void test_pat(u32 field, const char * field_name, u32 ctrl_field, 7093 u64 ctrl_bit) 7094 { 7095 u32 ctrl_saved = vmcs_read(ctrl_field); 7096 u64 pat_saved = vmcs_read(field); 7097 u64 i, val; 7098 u32 j; 7099 int error; 7100 7101 vmcs_clear_bits(ctrl_field, ctrl_bit); 7102 7103 for (i = 0; i < 256; i = (i < PAT_VAL_LIMIT) ? i + 1 : i * 2) { 7104 /* Test PAT0..PAT7 fields */ 7105 for (j = 0; j < (i ? 8 : 1); j++) { 7106 val = i << j * 8; 7107 vmcs_write(field, val); 7108 if (field == HOST_PAT) { 7109 report_prefix_pushf("%s %lx", field_name, val); 7110 test_vmx_vmlaunch(0); 7111 report_prefix_pop(); 7112 7113 } else { // GUEST_PAT 7114 test_guest_state("ENT_LOAD_PAT enabled", false, 7115 val, "GUEST_PAT"); 7116 } 7117 } 7118 } 7119 7120 vmcs_set_bits(ctrl_field, ctrl_bit); 7121 for (i = 0; i < 256; i = (i < PAT_VAL_LIMIT) ? i + 1 : i * 2) { 7122 /* Test PAT0..PAT7 fields */ 7123 for (j = 0; j < (i ? 8 : 1); j++) { 7124 val = i << j * 8; 7125 vmcs_write(field, val); 7126 7127 if (field == HOST_PAT) { 7128 report_prefix_pushf("%s %lx", field_name, val); 7129 if (i == 0x2 || i == 0x3 || i >= 0x8) 7130 error = 7131 VMXERR_ENTRY_INVALID_HOST_STATE_FIELD; 7132 else 7133 error = 0; 7134 7135 test_vmx_vmlaunch(error); 7136 report_prefix_pop(); 7137 7138 } else { // GUEST_PAT 7139 error = (i == 0x2 || i == 0x3 || i >= 0x8); 7140 test_guest_state("ENT_LOAD_PAT enabled", !!error, 7141 val, "GUEST_PAT"); 7142 } 7143 7144 } 7145 } 7146 7147 vmcs_write(ctrl_field, ctrl_saved); 7148 vmcs_write(field, pat_saved); 7149 } 7150 7151 /* 7152 * If the "load IA32_PAT" VM-exit control is 1, the value of the field 7153 * for the IA32_PAT MSR must be one that could be written by WRMSR 7154 * without fault at CPL 0. Specifically, each of the 8 bytes in the 7155 * field must have one of the values 0 (UC), 1 (WC), 4 (WT), 5 (WP), 7156 * 6 (WB), or 7 (UC-). 7157 * 7158 * [Intel SDM] 7159 */ 7160 static void test_load_host_pat(void) 7161 { 7162 /* 7163 * "load IA32_PAT" VM-exit control 7164 */ 7165 if (!(ctrl_exit_rev.clr & EXI_LOAD_PAT)) { 7166 printf("\"Load-IA32-PAT\" exit control not supported\n"); 7167 return; 7168 } 7169 7170 test_pat(HOST_PAT, "HOST_PAT", EXI_CONTROLS, EXI_LOAD_PAT); 7171 } 7172 7173 union cpuidA_eax { 7174 struct { 7175 unsigned int version_id:8; 7176 unsigned int num_counters_gp:8; 7177 unsigned int bit_width:8; 7178 unsigned int mask_length:8; 7179 } split; 7180 unsigned int full; 7181 }; 7182 7183 union cpuidA_edx { 7184 struct { 7185 unsigned int num_counters_fixed:5; 7186 unsigned int bit_width_fixed:8; 7187 unsigned int reserved:9; 7188 } split; 7189 unsigned int full; 7190 }; 7191 7192 static bool valid_pgc(u64 val) 7193 { 7194 struct cpuid id; 7195 union cpuidA_eax eax; 7196 union cpuidA_edx edx; 7197 u64 mask; 7198 7199 id = cpuid(0xA); 7200 eax.full = id.a; 7201 edx.full = id.d; 7202 mask = ~(((1ull << eax.split.num_counters_gp) - 1) | 7203 (((1ull << edx.split.num_counters_fixed) - 1) << 32)); 7204 7205 return !(val & mask); 7206 } 7207 7208 static void test_pgc_vmlaunch(u32 xerror, u32 xreason, bool xfail, bool host) 7209 { 7210 u32 inst_err; 7211 u64 obs; 7212 bool success; 7213 struct vmx_state_area_test_data *data = &vmx_state_area_test_data; 7214 7215 if (host) { 7216 success = vmlaunch_succeeds(); 7217 obs = rdmsr(data->msr); 7218 if (!success) { 7219 inst_err = vmcs_read(VMX_INST_ERROR); 7220 report(xerror == inst_err, "vmlaunch failed, " 7221 "VMX Inst Error is %d (expected %d)", 7222 inst_err, xerror); 7223 } else { 7224 report(!data->enabled || data->exp == obs, 7225 "Host state is 0x%lx (expected 0x%lx)", 7226 obs, data->exp); 7227 report(success != xfail, "vmlaunch succeeded"); 7228 } 7229 } else { 7230 test_guest_state("load GUEST_PERF_GLOBAL_CTRL", xfail, 7231 GUEST_PERF_GLOBAL_CTRL, 7232 "GUEST_PERF_GLOBAL_CTRL"); 7233 } 7234 } 7235 7236 /* 7237 * test_load_perf_global_ctrl is a generic function for testing the 7238 * "load IA32_PERF_GLOBAL_CTRL" VM-{Entry,Exit} controls. This test function 7239 * tests the provided ctrl_val when disabled and enabled. 7240 * 7241 * @nr: VMCS field number corresponding to the host/guest state field 7242 * @name: Name of the above VMCS field for printing in test report 7243 * @ctrl_nr: VMCS field number corresponding to the VM-{Entry,Exit} control 7244 * @ctrl_val: Bit to set on the ctrl_field 7245 */ 7246 static void test_perf_global_ctrl(u32 nr, const char *name, u32 ctrl_nr, 7247 const char *ctrl_name, u64 ctrl_val) 7248 { 7249 u64 ctrl_saved = vmcs_read(ctrl_nr); 7250 u64 pgc_saved = vmcs_read(nr); 7251 u64 i, val; 7252 bool host = nr == HOST_PERF_GLOBAL_CTRL; 7253 struct vmx_state_area_test_data *data = &vmx_state_area_test_data; 7254 7255 data->msr = MSR_CORE_PERF_GLOBAL_CTRL; 7256 msr_bmp_init(); 7257 vmcs_write(ctrl_nr, ctrl_saved & ~ctrl_val); 7258 data->enabled = false; 7259 report_prefix_pushf("\"load IA32_PERF_GLOBAL_CTRL\"=0 on %s", 7260 ctrl_name); 7261 7262 for (i = 0; i < 64; i++) { 7263 val = 1ull << i; 7264 vmcs_write(nr, val); 7265 report_prefix_pushf("%s = 0x%lx", name, val); 7266 test_pgc_vmlaunch(0, VMX_VMCALL, false, host); 7267 report_prefix_pop(); 7268 } 7269 report_prefix_pop(); 7270 7271 vmcs_write(ctrl_nr, ctrl_saved | ctrl_val); 7272 data->enabled = true; 7273 report_prefix_pushf("\"load IA32_PERF_GLOBAL_CTRL\"=1 on %s", 7274 ctrl_name); 7275 for (i = 0; i < 64; i++) { 7276 val = 1ull << i; 7277 data->exp = val; 7278 vmcs_write(nr, val); 7279 report_prefix_pushf("%s = 0x%lx", name, val); 7280 if (valid_pgc(val)) { 7281 test_pgc_vmlaunch(0, VMX_VMCALL, false, host); 7282 } else { 7283 if (host) 7284 test_pgc_vmlaunch( 7285 VMXERR_ENTRY_INVALID_HOST_STATE_FIELD, 7286 0, 7287 true, 7288 host); 7289 else 7290 test_pgc_vmlaunch( 7291 0, 7292 VMX_ENTRY_FAILURE | VMX_FAIL_STATE, 7293 true, 7294 host); 7295 } 7296 report_prefix_pop(); 7297 } 7298 7299 data->enabled = false; 7300 report_prefix_pop(); 7301 vmcs_write(ctrl_nr, ctrl_saved); 7302 vmcs_write(nr, pgc_saved); 7303 } 7304 7305 static void test_load_host_perf_global_ctrl(void) 7306 { 7307 if (!(ctrl_exit_rev.clr & EXI_LOAD_PERF)) { 7308 printf("\"load IA32_PERF_GLOBAL_CTRL\" exit control not supported\n"); 7309 return; 7310 } 7311 7312 test_perf_global_ctrl(HOST_PERF_GLOBAL_CTRL, "HOST_PERF_GLOBAL_CTRL", 7313 EXI_CONTROLS, "EXI_CONTROLS", EXI_LOAD_PERF); 7314 } 7315 7316 7317 static void test_load_guest_perf_global_ctrl(void) 7318 { 7319 if (!(ctrl_enter_rev.clr & ENT_LOAD_PERF)) { 7320 printf("\"load IA32_PERF_GLOBAL_CTRL\" entry control not supported\n"); 7321 return; 7322 } 7323 7324 test_perf_global_ctrl(GUEST_PERF_GLOBAL_CTRL, "GUEST_PERF_GLOBAL_CTRL", 7325 ENT_CONTROLS, "ENT_CONTROLS", ENT_LOAD_PERF); 7326 } 7327 7328 7329 /* 7330 * test_vmcs_field - test a value for the given VMCS field 7331 * @field: VMCS field 7332 * @field_name: string name of VMCS field 7333 * @bit_start: starting bit 7334 * @bit_end: ending bit 7335 * @val: value that the bit range must or must not contain 7336 * @valid_val: whether value given in 'val' must be valid or not 7337 * @error: expected VMCS error when vmentry fails for an invalid value 7338 */ 7339 static void test_vmcs_field(u64 field, const char *field_name, u32 bit_start, 7340 u32 bit_end, u64 val, bool valid_val, u32 error) 7341 { 7342 u64 field_saved = vmcs_read(field); 7343 u32 i; 7344 u64 tmp; 7345 u32 bit_on; 7346 u64 mask = ~0ull; 7347 7348 mask = (mask >> bit_end) << bit_end; 7349 mask = mask | ((1 << bit_start) - 1); 7350 tmp = (field_saved & mask) | (val << bit_start); 7351 7352 vmcs_write(field, tmp); 7353 report_prefix_pushf("%s %lx", field_name, tmp); 7354 if (valid_val) 7355 test_vmx_vmlaunch(0); 7356 else 7357 test_vmx_vmlaunch(error); 7358 report_prefix_pop(); 7359 7360 for (i = bit_start; i <= bit_end; i = i + 2) { 7361 bit_on = ((1ull < i) & (val << bit_start)) ? 0 : 1; 7362 if (bit_on) 7363 tmp = field_saved | (1ull << i); 7364 else 7365 tmp = field_saved & ~(1ull << i); 7366 vmcs_write(field, tmp); 7367 report_prefix_pushf("%s %lx", field_name, tmp); 7368 if (valid_val) 7369 test_vmx_vmlaunch(error); 7370 else 7371 test_vmx_vmlaunch(0); 7372 report_prefix_pop(); 7373 } 7374 7375 vmcs_write(field, field_saved); 7376 } 7377 7378 static void test_canonical(u64 field, const char * field_name, bool host) 7379 { 7380 u64 addr_saved = vmcs_read(field); 7381 7382 /* 7383 * Use the existing value if possible. Writing a random canonical 7384 * value is not an option as doing so would corrupt the field being 7385 * tested and likely hose the test. 7386 */ 7387 if (is_canonical(addr_saved)) { 7388 if (host) { 7389 report_prefix_pushf("%s %lx", field_name, addr_saved); 7390 test_vmx_vmlaunch(0); 7391 report_prefix_pop(); 7392 } else { 7393 test_guest_state("Test canonical address", false, 7394 addr_saved, field_name); 7395 } 7396 } 7397 7398 vmcs_write(field, NONCANONICAL); 7399 7400 if (host) { 7401 report_prefix_pushf("%s %llx", field_name, NONCANONICAL); 7402 test_vmx_vmlaunch(VMXERR_ENTRY_INVALID_HOST_STATE_FIELD); 7403 report_prefix_pop(); 7404 } else { 7405 test_guest_state("Test non-canonical address", true, 7406 NONCANONICAL, field_name); 7407 } 7408 7409 vmcs_write(field, addr_saved); 7410 } 7411 7412 #define TEST_RPL_TI_FLAGS(reg, name) \ 7413 test_vmcs_field(reg, name, 0, 2, 0x0, true, \ 7414 VMXERR_ENTRY_INVALID_HOST_STATE_FIELD); 7415 7416 #define TEST_CS_TR_FLAGS(reg, name) \ 7417 test_vmcs_field(reg, name, 3, 15, 0x0000, false, \ 7418 VMXERR_ENTRY_INVALID_HOST_STATE_FIELD); 7419 7420 /* 7421 * 1. In the selector field for each of CS, SS, DS, ES, FS, GS and TR, the 7422 * RPL (bits 1:0) and the TI flag (bit 2) must be 0. 7423 * 2. The selector fields for CS and TR cannot be 0000H. 7424 * 3. The selector field for SS cannot be 0000H if the "host address-space 7425 * size" VM-exit control is 0. 7426 * 4. On processors that support Intel 64 architecture, the base-address 7427 * fields for FS, GS and TR must contain canonical addresses. 7428 */ 7429 static void test_host_segment_regs(void) 7430 { 7431 u16 selector_saved; 7432 7433 /* 7434 * Test RPL and TI flags 7435 */ 7436 TEST_RPL_TI_FLAGS(HOST_SEL_CS, "HOST_SEL_CS"); 7437 TEST_RPL_TI_FLAGS(HOST_SEL_SS, "HOST_SEL_SS"); 7438 TEST_RPL_TI_FLAGS(HOST_SEL_DS, "HOST_SEL_DS"); 7439 TEST_RPL_TI_FLAGS(HOST_SEL_ES, "HOST_SEL_ES"); 7440 TEST_RPL_TI_FLAGS(HOST_SEL_FS, "HOST_SEL_FS"); 7441 TEST_RPL_TI_FLAGS(HOST_SEL_GS, "HOST_SEL_GS"); 7442 TEST_RPL_TI_FLAGS(HOST_SEL_TR, "HOST_SEL_TR"); 7443 7444 /* 7445 * Test that CS and TR fields can not be 0x0000 7446 */ 7447 TEST_CS_TR_FLAGS(HOST_SEL_CS, "HOST_SEL_CS"); 7448 TEST_CS_TR_FLAGS(HOST_SEL_TR, "HOST_SEL_TR"); 7449 7450 /* 7451 * SS field can not be 0x0000 if "host address-space size" VM-exit 7452 * control is 0 7453 */ 7454 selector_saved = vmcs_read(HOST_SEL_SS); 7455 vmcs_write(HOST_SEL_SS, 0); 7456 report_prefix_pushf("HOST_SEL_SS 0"); 7457 if (vmcs_read(EXI_CONTROLS) & EXI_HOST_64) { 7458 test_vmx_vmlaunch(0); 7459 } else { 7460 test_vmx_vmlaunch(VMXERR_ENTRY_INVALID_HOST_STATE_FIELD); 7461 } 7462 report_prefix_pop(); 7463 7464 vmcs_write(HOST_SEL_SS, selector_saved); 7465 7466 #ifdef __x86_64__ 7467 /* 7468 * Base address for FS, GS and TR must be canonical 7469 */ 7470 test_canonical(HOST_BASE_FS, "HOST_BASE_FS", true); 7471 test_canonical(HOST_BASE_GS, "HOST_BASE_GS", true); 7472 test_canonical(HOST_BASE_TR, "HOST_BASE_TR", true); 7473 #endif 7474 } 7475 7476 /* 7477 * On processors that support Intel 64 architecture, the base-address 7478 * fields for GDTR and IDTR must contain canonical addresses. 7479 */ 7480 static void test_host_desc_tables(void) 7481 { 7482 #ifdef __x86_64__ 7483 test_canonical(HOST_BASE_GDTR, "HOST_BASE_GDTR", true); 7484 test_canonical(HOST_BASE_IDTR, "HOST_BASE_IDTR", true); 7485 #endif 7486 } 7487 7488 /* 7489 * If the "host address-space size" VM-exit control is 0, the following must 7490 * hold: 7491 * - The "IA-32e mode guest" VM-entry control is 0. 7492 * - Bit 17 of the CR4 field (corresponding to CR4.PCIDE) is 0. 7493 * - Bits 63:32 in the RIP field are 0. 7494 * 7495 * If the "host address-space size" VM-exit control is 1, the following must 7496 * hold: 7497 * - Bit 5 of the CR4 field (corresponding to CR4.PAE) is 1. 7498 * - The RIP field contains a canonical address. 7499 * 7500 */ 7501 static void test_host_addr_size(void) 7502 { 7503 u64 cr4_saved = vmcs_read(HOST_CR4); 7504 u64 rip_saved = vmcs_read(HOST_RIP); 7505 u64 entry_ctrl_saved = vmcs_read(ENT_CONTROLS); 7506 int i; 7507 u64 tmp; 7508 7509 if (vmcs_read(EXI_CONTROLS) & EXI_HOST_64) { 7510 vmcs_write(ENT_CONTROLS, entry_ctrl_saved | ENT_GUEST_64); 7511 report_prefix_pushf("\"IA-32e mode guest\" enabled"); 7512 test_vmx_vmlaunch(0); 7513 report_prefix_pop(); 7514 7515 vmcs_write(HOST_CR4, cr4_saved | X86_CR4_PCIDE); 7516 report_prefix_pushf("\"CR4.PCIDE\" set"); 7517 test_vmx_vmlaunch(0); 7518 report_prefix_pop(); 7519 7520 for (i = 32; i <= 63; i = i + 4) { 7521 tmp = rip_saved | 1ull << i; 7522 vmcs_write(HOST_RIP, tmp); 7523 report_prefix_pushf("HOST_RIP %lx", tmp); 7524 test_vmx_vmlaunch(0); 7525 report_prefix_pop(); 7526 } 7527 7528 if (cr4_saved & X86_CR4_PAE) { 7529 vmcs_write(HOST_CR4, cr4_saved & ~X86_CR4_PAE); 7530 report_prefix_pushf("\"CR4.PAE\" unset"); 7531 test_vmx_vmlaunch(VMXERR_ENTRY_INVALID_HOST_STATE_FIELD); 7532 } else { 7533 report_prefix_pushf("\"CR4.PAE\" set"); 7534 test_vmx_vmlaunch(0); 7535 } 7536 report_prefix_pop(); 7537 7538 vmcs_write(HOST_RIP, NONCANONICAL); 7539 report_prefix_pushf("HOST_RIP %llx", NONCANONICAL); 7540 test_vmx_vmlaunch(VMXERR_ENTRY_INVALID_HOST_STATE_FIELD); 7541 report_prefix_pop(); 7542 7543 vmcs_write(ENT_CONTROLS, entry_ctrl_saved | ENT_GUEST_64); 7544 vmcs_write(HOST_RIP, rip_saved); 7545 vmcs_write(HOST_CR4, cr4_saved); 7546 } 7547 } 7548 7549 /* 7550 * Check that the virtual CPU checks the VMX Host State Area as 7551 * documented in the Intel SDM. 7552 */ 7553 static void vmx_host_state_area_test(void) 7554 { 7555 /* 7556 * Bit 1 of the guest's RFLAGS must be 1, or VM-entry will 7557 * fail due to invalid guest state, should we make it that 7558 * far. 7559 */ 7560 vmcs_write(GUEST_RFLAGS, 0); 7561 7562 test_host_ctl_regs(); 7563 7564 test_canonical(HOST_SYSENTER_ESP, "HOST_SYSENTER_ESP", true); 7565 test_canonical(HOST_SYSENTER_EIP, "HOST_SYSENTER_EIP", true); 7566 7567 test_host_efer(); 7568 test_load_host_pat(); 7569 test_host_segment_regs(); 7570 test_host_desc_tables(); 7571 test_host_addr_size(); 7572 test_load_host_perf_global_ctrl(); 7573 } 7574 7575 /* 7576 * If the "load debug controls" VM-entry control is 1, bits 63:32 in 7577 * the DR7 field must be 0. 7578 * 7579 * [Intel SDM] 7580 */ 7581 static void test_guest_dr7(void) 7582 { 7583 u32 ent_saved = vmcs_read(ENT_CONTROLS); 7584 u64 dr7_saved = vmcs_read(GUEST_DR7); 7585 u64 val; 7586 int i; 7587 7588 if (ctrl_enter_rev.set & ENT_LOAD_DBGCTLS) { 7589 vmcs_clear_bits(ENT_CONTROLS, ENT_LOAD_DBGCTLS); 7590 for (i = 0; i < 64; i++) { 7591 val = 1ull << i; 7592 vmcs_write(GUEST_DR7, val); 7593 test_guest_state("ENT_LOAD_DBGCTLS disabled", false, 7594 val, "GUEST_DR7"); 7595 } 7596 } 7597 if (ctrl_enter_rev.clr & ENT_LOAD_DBGCTLS) { 7598 vmcs_set_bits(ENT_CONTROLS, ENT_LOAD_DBGCTLS); 7599 for (i = 0; i < 64; i++) { 7600 val = 1ull << i; 7601 vmcs_write(GUEST_DR7, val); 7602 test_guest_state("ENT_LOAD_DBGCTLS enabled", i >= 32, 7603 val, "GUEST_DR7"); 7604 } 7605 } 7606 vmcs_write(GUEST_DR7, dr7_saved); 7607 vmcs_write(ENT_CONTROLS, ent_saved); 7608 } 7609 7610 /* 7611 * If the "load IA32_PAT" VM-entry control is 1, the value of the field 7612 * for the IA32_PAT MSR must be one that could be written by WRMSR 7613 * without fault at CPL 0. Specifically, each of the 8 bytes in the 7614 * field must have one of the values 0 (UC), 1 (WC), 4 (WT), 5 (WP), 7615 * 6 (WB), or 7 (UC-). 7616 * 7617 * [Intel SDM] 7618 */ 7619 static void test_load_guest_pat(void) 7620 { 7621 /* 7622 * "load IA32_PAT" VM-entry control 7623 */ 7624 if (!(ctrl_enter_rev.clr & ENT_LOAD_PAT)) { 7625 printf("\"Load-IA32-PAT\" entry control not supported\n"); 7626 return; 7627 } 7628 7629 test_pat(GUEST_PAT, "GUEST_PAT", ENT_CONTROLS, ENT_LOAD_PAT); 7630 } 7631 7632 #define MSR_IA32_BNDCFGS_RSVD_MASK 0x00000ffc 7633 7634 /* 7635 * If the “load IA32_BNDCFGS†VM-entry control is 1, the following 7636 * checks are performed on the field for the IA32_BNDCFGS MSR: 7637 * 7638 * — Bits reserved in the IA32_BNDCFGS MSR must be 0. 7639 * — The linear address in bits 63:12 must be canonical. 7640 * 7641 * [Intel SDM] 7642 */ 7643 static void test_load_guest_bndcfgs(void) 7644 { 7645 u64 bndcfgs_saved = vmcs_read(GUEST_BNDCFGS); 7646 u64 bndcfgs; 7647 7648 if (!(ctrl_enter_rev.clr & ENT_LOAD_BNDCFGS)) { 7649 printf("\"Load-IA32-BNDCFGS\" entry control not supported\n"); 7650 return; 7651 } 7652 7653 vmcs_clear_bits(ENT_CONTROLS, ENT_LOAD_BNDCFGS); 7654 7655 vmcs_write(GUEST_BNDCFGS, NONCANONICAL); 7656 test_guest_state("ENT_LOAD_BNDCFGS disabled", false, 7657 GUEST_BNDCFGS, "GUEST_BNDCFGS"); 7658 bndcfgs = bndcfgs_saved | MSR_IA32_BNDCFGS_RSVD_MASK; 7659 vmcs_write(GUEST_BNDCFGS, bndcfgs); 7660 test_guest_state("ENT_LOAD_BNDCFGS disabled", false, 7661 GUEST_BNDCFGS, "GUEST_BNDCFGS"); 7662 7663 vmcs_set_bits(ENT_CONTROLS, ENT_LOAD_BNDCFGS); 7664 7665 vmcs_write(GUEST_BNDCFGS, NONCANONICAL); 7666 test_guest_state("ENT_LOAD_BNDCFGS enabled", true, 7667 GUEST_BNDCFGS, "GUEST_BNDCFGS"); 7668 bndcfgs = bndcfgs_saved | MSR_IA32_BNDCFGS_RSVD_MASK; 7669 vmcs_write(GUEST_BNDCFGS, bndcfgs); 7670 test_guest_state("ENT_LOAD_BNDCFGS enabled", true, 7671 GUEST_BNDCFGS, "GUEST_BNDCFGS"); 7672 7673 vmcs_write(GUEST_BNDCFGS, bndcfgs_saved); 7674 } 7675 7676 /* 7677 * Check that the virtual CPU checks the VMX Guest State Area as 7678 * documented in the Intel SDM. 7679 */ 7680 static void vmx_guest_state_area_test(void) 7681 { 7682 vmx_set_test_stage(1); 7683 test_set_guest(guest_state_test_main); 7684 7685 /* 7686 * The IA32_SYSENTER_ESP field and the IA32_SYSENTER_EIP field 7687 * must each contain a canonical address. 7688 */ 7689 test_canonical(GUEST_SYSENTER_ESP, "GUEST_SYSENTER_ESP", false); 7690 test_canonical(GUEST_SYSENTER_EIP, "GUEST_SYSENTER_EIP", false); 7691 7692 test_guest_dr7(); 7693 test_load_guest_pat(); 7694 test_guest_efer(); 7695 test_load_guest_perf_global_ctrl(); 7696 test_load_guest_bndcfgs(); 7697 7698 /* 7699 * Let the guest finish execution 7700 */ 7701 vmx_set_test_stage(2); 7702 enter_guest(); 7703 } 7704 7705 static bool valid_vmcs_for_vmentry(void) 7706 { 7707 struct vmcs *current_vmcs = NULL; 7708 7709 if (vmcs_save(¤t_vmcs)) 7710 return false; 7711 7712 return current_vmcs && !current_vmcs->hdr.shadow_vmcs; 7713 } 7714 7715 static void try_vmentry_in_movss_shadow(void) 7716 { 7717 u32 vm_inst_err; 7718 u32 flags; 7719 bool early_failure = false; 7720 u32 expected_flags = X86_EFLAGS_FIXED; 7721 bool valid_vmcs = valid_vmcs_for_vmentry(); 7722 7723 expected_flags |= valid_vmcs ? X86_EFLAGS_ZF : X86_EFLAGS_CF; 7724 7725 /* 7726 * Indirectly set VM_INST_ERR to 12 ("VMREAD/VMWRITE from/to 7727 * unsupported VMCS component"). 7728 */ 7729 vmcs_write(~0u, 0); 7730 7731 __asm__ __volatile__ ("mov %[host_rsp], %%edx;" 7732 "vmwrite %%rsp, %%rdx;" 7733 "mov 0f, %%rax;" 7734 "mov %[host_rip], %%edx;" 7735 "vmwrite %%rax, %%rdx;" 7736 "mov $-1, %%ah;" 7737 "sahf;" 7738 "mov %%ss, %%ax;" 7739 "mov %%ax, %%ss;" 7740 "vmlaunch;" 7741 "mov $1, %[early_failure];" 7742 "0: lahf;" 7743 "movzbl %%ah, %[flags]" 7744 : [early_failure] "+r" (early_failure), 7745 [flags] "=&a" (flags) 7746 : [host_rsp] "i" (HOST_RSP), 7747 [host_rip] "i" (HOST_RIP) 7748 : "rdx", "cc", "memory"); 7749 vm_inst_err = vmcs_read(VMX_INST_ERROR); 7750 7751 report(early_failure, "Early VM-entry failure"); 7752 report(flags == expected_flags, "RFLAGS[8:0] is %x (actual %x)", 7753 expected_flags, flags); 7754 if (valid_vmcs) 7755 report(vm_inst_err == VMXERR_ENTRY_EVENTS_BLOCKED_BY_MOV_SS, 7756 "VM-instruction error is %d (actual %d)", 7757 VMXERR_ENTRY_EVENTS_BLOCKED_BY_MOV_SS, vm_inst_err); 7758 } 7759 7760 static void vmentry_movss_shadow_test(void) 7761 { 7762 struct vmcs *orig_vmcs; 7763 7764 TEST_ASSERT(!vmcs_save(&orig_vmcs)); 7765 7766 /* 7767 * Set the launched flag on the current VMCS to verify the correct 7768 * error priority, below. 7769 */ 7770 test_set_guest(v2_null_test_guest); 7771 enter_guest(); 7772 7773 /* 7774 * With bit 1 of the guest's RFLAGS clear, VM-entry should 7775 * fail due to invalid guest state (if we make it that far). 7776 */ 7777 vmcs_write(GUEST_RFLAGS, 0); 7778 7779 /* 7780 * "VM entry with events blocked by MOV SS" takes precedence over 7781 * "VMLAUNCH with non-clear VMCS." 7782 */ 7783 report_prefix_push("valid current-VMCS"); 7784 try_vmentry_in_movss_shadow(); 7785 report_prefix_pop(); 7786 7787 /* 7788 * VMfailInvalid takes precedence over "VM entry with events 7789 * blocked by MOV SS." 7790 */ 7791 TEST_ASSERT(!vmcs_clear(orig_vmcs)); 7792 report_prefix_push("no current-VMCS"); 7793 try_vmentry_in_movss_shadow(); 7794 report_prefix_pop(); 7795 7796 TEST_ASSERT(!make_vmcs_current(orig_vmcs)); 7797 vmcs_write(GUEST_RFLAGS, X86_EFLAGS_FIXED); 7798 } 7799 7800 static void vmx_cr_load_test(void) 7801 { 7802 unsigned long cr3, cr4, orig_cr3, orig_cr4; 7803 7804 orig_cr4 = read_cr4(); 7805 orig_cr3 = read_cr3(); 7806 7807 if (!this_cpu_has(X86_FEATURE_PCID)) { 7808 report_skip("PCID not detected"); 7809 return; 7810 } 7811 if (!this_cpu_has(X86_FEATURE_MCE)) { 7812 report_skip("MCE not detected"); 7813 return; 7814 } 7815 7816 TEST_ASSERT(!(orig_cr3 & X86_CR3_PCID_MASK)); 7817 7818 /* Enable PCID for L1. */ 7819 cr4 = orig_cr4 | X86_CR4_PCIDE; 7820 cr3 = orig_cr3 | 0x1; 7821 TEST_ASSERT(!write_cr4_checking(cr4)); 7822 write_cr3(cr3); 7823 7824 test_set_guest(v2_null_test_guest); 7825 vmcs_write(HOST_CR4, cr4); 7826 vmcs_write(HOST_CR3, cr3); 7827 enter_guest(); 7828 7829 /* 7830 * No exception is expected. 7831 * 7832 * NB. KVM loads the last guest write to CR4 into CR4 read 7833 * shadow. In order to trigger an exit to KVM, we can toggle a 7834 * bit that is owned by KVM. We use CR4.MCE, which shall 7835 * have no side effect because normally no guest MCE (e.g., as the 7836 * result of bad memory) would happen during this test. 7837 */ 7838 TEST_ASSERT(!write_cr4_checking(cr4 ^ X86_CR4_MCE)); 7839 7840 /* Cleanup L1 state. */ 7841 write_cr3(orig_cr3); 7842 TEST_ASSERT(!write_cr4_checking(orig_cr4)); 7843 } 7844 7845 static void vmx_nm_test_guest(void) 7846 { 7847 write_cr0(read_cr0() | X86_CR0_TS); 7848 asm volatile("fnop"); 7849 } 7850 7851 static void check_nm_exit(const char *test) 7852 { 7853 u32 reason = vmcs_read(EXI_REASON); 7854 u32 intr_info = vmcs_read(EXI_INTR_INFO); 7855 const u32 expected = INTR_INFO_VALID_MASK | INTR_TYPE_HARD_EXCEPTION | 7856 NM_VECTOR; 7857 7858 report(reason == VMX_EXC_NMI && intr_info == expected, "%s", test); 7859 } 7860 7861 /* 7862 * This test checks that: 7863 * 7864 * (a) If L2 launches with CR0.TS clear, but later sets CR0.TS, then 7865 * a subsequent #NM VM-exit is reflected to L1. 7866 * 7867 * (b) If L2 launches with CR0.TS clear and CR0.EM set, then a 7868 * subsequent #NM VM-exit is reflected to L1. 7869 */ 7870 static void vmx_nm_test(void) 7871 { 7872 unsigned long cr0 = read_cr0(); 7873 7874 test_set_guest(vmx_nm_test_guest); 7875 7876 /* 7877 * L1 wants to intercept #NM exceptions encountered in L2. 7878 */ 7879 vmcs_write(EXC_BITMAP, 1 << NM_VECTOR); 7880 7881 /* 7882 * Launch L2 with CR0.TS clear, but don't claim host ownership of 7883 * any CR0 bits. L2 will set CR0.TS and then try to execute fnop, 7884 * which will raise #NM. L0 should reflect the #NM VM-exit to L1. 7885 */ 7886 vmcs_write(CR0_MASK, 0); 7887 vmcs_write(GUEST_CR0, cr0 & ~X86_CR0_TS); 7888 enter_guest(); 7889 check_nm_exit("fnop with CR0.TS set in L2 triggers #NM VM-exit to L1"); 7890 7891 /* 7892 * Re-enter L2 at the fnop instruction, with CR0.TS clear but 7893 * CR0.EM set. The fnop will still raise #NM, and L0 should 7894 * reflect the #NM VM-exit to L1. 7895 */ 7896 vmcs_write(GUEST_CR0, (cr0 & ~X86_CR0_TS) | X86_CR0_EM); 7897 enter_guest(); 7898 check_nm_exit("fnop with CR0.EM set in L2 triggers #NM VM-exit to L1"); 7899 7900 /* 7901 * Re-enter L2 at the fnop instruction, with both CR0.TS and 7902 * CR0.EM clear. There will be no #NM, and the L2 guest should 7903 * exit normally. 7904 */ 7905 vmcs_write(GUEST_CR0, cr0 & ~(X86_CR0_TS | X86_CR0_EM)); 7906 enter_guest(); 7907 } 7908 7909 bool vmx_pending_event_ipi_fired; 7910 static void vmx_pending_event_ipi_isr(isr_regs_t *regs) 7911 { 7912 vmx_pending_event_ipi_fired = true; 7913 eoi(); 7914 } 7915 7916 bool vmx_pending_event_guest_run; 7917 static void vmx_pending_event_guest(void) 7918 { 7919 vmcall(); 7920 vmx_pending_event_guest_run = true; 7921 } 7922 7923 static void vmx_pending_event_test_core(bool guest_hlt) 7924 { 7925 int ipi_vector = 0xf1; 7926 7927 vmx_pending_event_ipi_fired = false; 7928 handle_irq(ipi_vector, vmx_pending_event_ipi_isr); 7929 7930 vmx_pending_event_guest_run = false; 7931 test_set_guest(vmx_pending_event_guest); 7932 7933 vmcs_set_bits(PIN_CONTROLS, PIN_EXTINT); 7934 7935 enter_guest(); 7936 skip_exit_vmcall(); 7937 7938 if (guest_hlt) 7939 vmcs_write(GUEST_ACTV_STATE, ACTV_HLT); 7940 7941 irq_disable(); 7942 apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL | 7943 APIC_DM_FIXED | ipi_vector, 7944 0); 7945 7946 enter_guest(); 7947 7948 assert_exit_reason(VMX_EXTINT); 7949 report(!vmx_pending_event_guest_run, 7950 "Guest did not run before host received IPI"); 7951 7952 irq_enable(); 7953 asm volatile ("nop"); 7954 irq_disable(); 7955 report(vmx_pending_event_ipi_fired, 7956 "Got pending interrupt after IRQ enabled"); 7957 7958 if (guest_hlt) 7959 vmcs_write(GUEST_ACTV_STATE, ACTV_ACTIVE); 7960 7961 enter_guest(); 7962 report(vmx_pending_event_guest_run, 7963 "Guest finished running when no interrupt"); 7964 } 7965 7966 static void vmx_pending_event_test(void) 7967 { 7968 vmx_pending_event_test_core(false); 7969 } 7970 7971 static void vmx_pending_event_hlt_test(void) 7972 { 7973 vmx_pending_event_test_core(true); 7974 } 7975 7976 static int vmx_window_test_db_count; 7977 7978 static void vmx_window_test_db_handler(struct ex_regs *regs) 7979 { 7980 vmx_window_test_db_count++; 7981 } 7982 7983 static void vmx_nmi_window_test_guest(void) 7984 { 7985 handle_exception(DB_VECTOR, vmx_window_test_db_handler); 7986 7987 asm volatile("vmcall\n\t" 7988 "nop\n\t"); 7989 7990 handle_exception(DB_VECTOR, NULL); 7991 } 7992 7993 static void verify_nmi_window_exit(u64 rip) 7994 { 7995 u32 exit_reason = vmcs_read(EXI_REASON); 7996 7997 report(exit_reason == VMX_NMI_WINDOW, 7998 "Exit reason (%d) is 'NMI window'", exit_reason); 7999 report(vmcs_read(GUEST_RIP) == rip, "RIP (%#lx) is %#lx", 8000 vmcs_read(GUEST_RIP), rip); 8001 vmcs_write(GUEST_ACTV_STATE, ACTV_ACTIVE); 8002 } 8003 8004 static void vmx_nmi_window_test(void) 8005 { 8006 u64 nop_addr; 8007 void *db_fault_addr = get_idt_addr(&boot_idt[DB_VECTOR]); 8008 8009 if (!(ctrl_pin_rev.clr & PIN_VIRT_NMI)) { 8010 report_skip("CPU does not support the \"Virtual NMIs\" VM-execution control."); 8011 return; 8012 } 8013 8014 if (!(ctrl_cpu_rev[0].clr & CPU_NMI_WINDOW)) { 8015 report_skip("CPU does not support the \"NMI-window exiting\" VM-execution control."); 8016 return; 8017 } 8018 8019 vmx_window_test_db_count = 0; 8020 8021 report_prefix_push("NMI-window"); 8022 test_set_guest(vmx_nmi_window_test_guest); 8023 vmcs_set_bits(PIN_CONTROLS, PIN_VIRT_NMI); 8024 enter_guest(); 8025 skip_exit_vmcall(); 8026 nop_addr = vmcs_read(GUEST_RIP); 8027 8028 /* 8029 * Ask for "NMI-window exiting," and expect an immediate VM-exit. 8030 * RIP will not advance. 8031 */ 8032 report_prefix_push("active, no blocking"); 8033 vmcs_set_bits(CPU_EXEC_CTRL0, CPU_NMI_WINDOW); 8034 enter_guest(); 8035 verify_nmi_window_exit(nop_addr); 8036 report_prefix_pop(); 8037 8038 /* 8039 * Ask for "NMI-window exiting" in a MOV-SS shadow, and expect 8040 * a VM-exit on the next instruction after the nop. (The nop 8041 * is one byte.) 8042 */ 8043 report_prefix_push("active, blocking by MOV-SS"); 8044 vmcs_write(GUEST_INTR_STATE, GUEST_INTR_STATE_MOVSS); 8045 enter_guest(); 8046 verify_nmi_window_exit(nop_addr + 1); 8047 report_prefix_pop(); 8048 8049 /* 8050 * Ask for "NMI-window exiting" (with event injection), and 8051 * expect a VM-exit after the event is injected. (RIP should 8052 * be at the address specified in the IDT entry for #DB.) 8053 */ 8054 report_prefix_push("active, no blocking, injecting #DB"); 8055 vmcs_write(ENT_INTR_INFO, 8056 INTR_INFO_VALID_MASK | INTR_TYPE_HARD_EXCEPTION | DB_VECTOR); 8057 enter_guest(); 8058 verify_nmi_window_exit((u64)db_fault_addr); 8059 report_prefix_pop(); 8060 8061 /* 8062 * Ask for "NMI-window exiting" with NMI blocking, and expect 8063 * a VM-exit after the next IRET (i.e. after the #DB handler 8064 * returns). So, RIP should be back at one byte past the nop. 8065 */ 8066 report_prefix_push("active, blocking by NMI"); 8067 vmcs_write(GUEST_INTR_STATE, GUEST_INTR_STATE_NMI); 8068 enter_guest(); 8069 verify_nmi_window_exit(nop_addr + 1); 8070 report(vmx_window_test_db_count == 1, 8071 "#DB handler executed once (actual %d times)", 8072 vmx_window_test_db_count); 8073 report_prefix_pop(); 8074 8075 if (!(rdmsr(MSR_IA32_VMX_MISC) & (1 << 6))) { 8076 report_skip("CPU does not support activity state HLT."); 8077 } else { 8078 /* 8079 * Ask for "NMI-window exiting" when entering activity 8080 * state HLT, and expect an immediate VM-exit. RIP is 8081 * still one byte past the nop. 8082 */ 8083 report_prefix_push("halted, no blocking"); 8084 vmcs_write(GUEST_ACTV_STATE, ACTV_HLT); 8085 enter_guest(); 8086 verify_nmi_window_exit(nop_addr + 1); 8087 report_prefix_pop(); 8088 8089 /* 8090 * Ask for "NMI-window exiting" when entering activity 8091 * state HLT (with event injection), and expect a 8092 * VM-exit after the event is injected. (RIP should be 8093 * at the address specified in the IDT entry for #DB.) 8094 */ 8095 report_prefix_push("halted, no blocking, injecting #DB"); 8096 vmcs_write(GUEST_ACTV_STATE, ACTV_HLT); 8097 vmcs_write(ENT_INTR_INFO, 8098 INTR_INFO_VALID_MASK | INTR_TYPE_HARD_EXCEPTION | 8099 DB_VECTOR); 8100 enter_guest(); 8101 verify_nmi_window_exit((u64)db_fault_addr); 8102 report_prefix_pop(); 8103 } 8104 8105 vmcs_clear_bits(CPU_EXEC_CTRL0, CPU_NMI_WINDOW); 8106 enter_guest(); 8107 report_prefix_pop(); 8108 } 8109 8110 static void vmx_intr_window_test_guest(void) 8111 { 8112 handle_exception(DB_VECTOR, vmx_window_test_db_handler); 8113 8114 /* 8115 * The two consecutive STIs are to ensure that only the first 8116 * one has a shadow. Note that NOP and STI are one byte 8117 * instructions. 8118 */ 8119 asm volatile("vmcall\n\t" 8120 "nop\n\t" 8121 "sti\n\t" 8122 "sti\n\t"); 8123 8124 handle_exception(DB_VECTOR, NULL); 8125 } 8126 8127 static void verify_intr_window_exit(u64 rip) 8128 { 8129 u32 exit_reason = vmcs_read(EXI_REASON); 8130 8131 report(exit_reason == VMX_INTR_WINDOW, 8132 "Exit reason (%d) is 'interrupt window'", exit_reason); 8133 report(vmcs_read(GUEST_RIP) == rip, "RIP (%#lx) is %#lx", 8134 vmcs_read(GUEST_RIP), rip); 8135 vmcs_write(GUEST_ACTV_STATE, ACTV_ACTIVE); 8136 } 8137 8138 static void vmx_intr_window_test(void) 8139 { 8140 u64 vmcall_addr; 8141 u64 nop_addr; 8142 unsigned int orig_db_gate_type; 8143 void *db_fault_addr = get_idt_addr(&boot_idt[DB_VECTOR]); 8144 8145 if (!(ctrl_cpu_rev[0].clr & CPU_INTR_WINDOW)) { 8146 report_skip("CPU does not support the \"interrupt-window exiting\" VM-execution control."); 8147 return; 8148 } 8149 8150 /* 8151 * Change the IDT entry for #DB from interrupt gate to trap gate, 8152 * so that it won't clear RFLAGS.IF. We don't want interrupts to 8153 * be disabled after vectoring a #DB. 8154 */ 8155 orig_db_gate_type = boot_idt[DB_VECTOR].type; 8156 boot_idt[DB_VECTOR].type = 15; 8157 8158 report_prefix_push("interrupt-window"); 8159 test_set_guest(vmx_intr_window_test_guest); 8160 enter_guest(); 8161 assert_exit_reason(VMX_VMCALL); 8162 vmcall_addr = vmcs_read(GUEST_RIP); 8163 8164 /* 8165 * Ask for "interrupt-window exiting" with RFLAGS.IF set and 8166 * no blocking; expect an immediate VM-exit. Note that we have 8167 * not advanced past the vmcall instruction yet, so RIP should 8168 * point to the vmcall instruction. 8169 */ 8170 report_prefix_push("active, no blocking, RFLAGS.IF=1"); 8171 vmcs_set_bits(CPU_EXEC_CTRL0, CPU_INTR_WINDOW); 8172 vmcs_write(GUEST_RFLAGS, X86_EFLAGS_FIXED | X86_EFLAGS_IF); 8173 enter_guest(); 8174 verify_intr_window_exit(vmcall_addr); 8175 report_prefix_pop(); 8176 8177 /* 8178 * Ask for "interrupt-window exiting" (with event injection) 8179 * with RFLAGS.IF set and no blocking; expect a VM-exit after 8180 * the event is injected. That is, RIP should should be at the 8181 * address specified in the IDT entry for #DB. 8182 */ 8183 report_prefix_push("active, no blocking, RFLAGS.IF=1, injecting #DB"); 8184 vmcs_write(ENT_INTR_INFO, 8185 INTR_INFO_VALID_MASK | INTR_TYPE_HARD_EXCEPTION | DB_VECTOR); 8186 vmcall_addr = vmcs_read(GUEST_RIP); 8187 enter_guest(); 8188 verify_intr_window_exit((u64)db_fault_addr); 8189 report_prefix_pop(); 8190 8191 /* 8192 * Let the L2 guest run through the IRET, back to the VMCALL. 8193 * We have to clear the "interrupt-window exiting" 8194 * VM-execution control, or it would just keep causing 8195 * VM-exits. Then, advance past the VMCALL and set the 8196 * "interrupt-window exiting" VM-execution control again. 8197 */ 8198 vmcs_clear_bits(CPU_EXEC_CTRL0, CPU_INTR_WINDOW); 8199 enter_guest(); 8200 skip_exit_vmcall(); 8201 nop_addr = vmcs_read(GUEST_RIP); 8202 vmcs_set_bits(CPU_EXEC_CTRL0, CPU_INTR_WINDOW); 8203 8204 /* 8205 * Ask for "interrupt-window exiting" in a MOV-SS shadow with 8206 * RFLAGS.IF set, and expect a VM-exit on the next 8207 * instruction. (NOP is one byte.) 8208 */ 8209 report_prefix_push("active, blocking by MOV-SS, RFLAGS.IF=1"); 8210 vmcs_write(GUEST_INTR_STATE, GUEST_INTR_STATE_MOVSS); 8211 enter_guest(); 8212 verify_intr_window_exit(nop_addr + 1); 8213 report_prefix_pop(); 8214 8215 /* 8216 * Back up to the NOP and ask for "interrupt-window exiting" 8217 * in an STI shadow with RFLAGS.IF set, and expect a VM-exit 8218 * on the next instruction. (NOP is one byte.) 8219 */ 8220 report_prefix_push("active, blocking by STI, RFLAGS.IF=1"); 8221 vmcs_write(GUEST_RIP, nop_addr); 8222 vmcs_write(GUEST_INTR_STATE, GUEST_INTR_STATE_STI); 8223 enter_guest(); 8224 verify_intr_window_exit(nop_addr + 1); 8225 report_prefix_pop(); 8226 8227 /* 8228 * Ask for "interrupt-window exiting" with RFLAGS.IF clear, 8229 * and expect a VM-exit on the instruction following the STI 8230 * shadow. Only the first STI (which is one byte past the NOP) 8231 * should have a shadow. The second STI (which is two bytes 8232 * past the NOP) has no shadow. Therefore, the interrupt 8233 * window opens at three bytes past the NOP. 8234 */ 8235 report_prefix_push("active, RFLAGS.IF = 0"); 8236 vmcs_write(GUEST_RFLAGS, X86_EFLAGS_FIXED); 8237 enter_guest(); 8238 verify_intr_window_exit(nop_addr + 3); 8239 report_prefix_pop(); 8240 8241 if (!(rdmsr(MSR_IA32_VMX_MISC) & (1 << 6))) { 8242 report_skip("CPU does not support activity state HLT."); 8243 } else { 8244 /* 8245 * Ask for "interrupt-window exiting" when entering 8246 * activity state HLT, and expect an immediate 8247 * VM-exit. RIP is still three bytes past the nop. 8248 */ 8249 report_prefix_push("halted, no blocking"); 8250 vmcs_write(GUEST_ACTV_STATE, ACTV_HLT); 8251 enter_guest(); 8252 verify_intr_window_exit(nop_addr + 3); 8253 report_prefix_pop(); 8254 8255 /* 8256 * Ask for "interrupt-window exiting" when entering 8257 * activity state HLT (with event injection), and 8258 * expect a VM-exit after the event is injected. That 8259 * is, RIP should should be at the address specified 8260 * in the IDT entry for #DB. 8261 */ 8262 report_prefix_push("halted, no blocking, injecting #DB"); 8263 vmcs_write(GUEST_ACTV_STATE, ACTV_HLT); 8264 vmcs_write(ENT_INTR_INFO, 8265 INTR_INFO_VALID_MASK | INTR_TYPE_HARD_EXCEPTION | 8266 DB_VECTOR); 8267 enter_guest(); 8268 verify_intr_window_exit((u64)db_fault_addr); 8269 report_prefix_pop(); 8270 } 8271 8272 boot_idt[DB_VECTOR].type = orig_db_gate_type; 8273 vmcs_clear_bits(CPU_EXEC_CTRL0, CPU_INTR_WINDOW); 8274 enter_guest(); 8275 report_prefix_pop(); 8276 } 8277 8278 #define GUEST_TSC_OFFSET (1u << 30) 8279 8280 static u64 guest_tsc; 8281 8282 static void vmx_store_tsc_test_guest(void) 8283 { 8284 guest_tsc = rdtsc(); 8285 } 8286 8287 /* 8288 * This test ensures that when IA32_TSC is in the VM-exit MSR-store 8289 * list, the value saved is not subject to the TSC offset that is 8290 * applied to RDTSC/RDTSCP/RDMSR(IA32_TSC) in guest execution. 8291 */ 8292 static void vmx_store_tsc_test(void) 8293 { 8294 struct vmx_msr_entry msr_entry = { .index = MSR_IA32_TSC }; 8295 u64 low, high; 8296 8297 if (!(ctrl_cpu_rev[0].clr & CPU_USE_TSC_OFFSET)) { 8298 report_skip("'Use TSC offsetting' not supported"); 8299 return; 8300 } 8301 8302 test_set_guest(vmx_store_tsc_test_guest); 8303 8304 vmcs_set_bits(CPU_EXEC_CTRL0, CPU_USE_TSC_OFFSET); 8305 vmcs_write(EXI_MSR_ST_CNT, 1); 8306 vmcs_write(EXIT_MSR_ST_ADDR, virt_to_phys(&msr_entry)); 8307 vmcs_write(TSC_OFFSET, GUEST_TSC_OFFSET); 8308 8309 low = rdtsc(); 8310 enter_guest(); 8311 high = rdtsc(); 8312 8313 report(low + GUEST_TSC_OFFSET <= guest_tsc && 8314 guest_tsc <= high + GUEST_TSC_OFFSET, 8315 "RDTSC value in the guest (%lu) is in range [%lu, %lu]", 8316 guest_tsc, low + GUEST_TSC_OFFSET, high + GUEST_TSC_OFFSET); 8317 report(low <= msr_entry.value && msr_entry.value <= high, 8318 "IA32_TSC value saved in the VM-exit MSR-store list (%lu) is in range [%lu, %lu]", 8319 msr_entry.value, low, high); 8320 } 8321 8322 static void vmx_db_test_guest(void) 8323 { 8324 /* 8325 * For a hardware generated single-step #DB. 8326 */ 8327 asm volatile("vmcall;" 8328 "nop;" 8329 ".Lpost_nop:"); 8330 /* 8331 * ...in a MOVSS shadow, with pending debug exceptions. 8332 */ 8333 asm volatile("vmcall;" 8334 "nop;" 8335 ".Lpost_movss_nop:"); 8336 /* 8337 * For an L0 synthesized single-step #DB. (L0 intercepts WBINVD and 8338 * emulates it in software.) 8339 */ 8340 asm volatile("vmcall;" 8341 "wbinvd;" 8342 ".Lpost_wbinvd:"); 8343 /* 8344 * ...in a MOVSS shadow, with pending debug exceptions. 8345 */ 8346 asm volatile("vmcall;" 8347 "wbinvd;" 8348 ".Lpost_movss_wbinvd:"); 8349 /* 8350 * For a hardware generated single-step #DB in a transactional region. 8351 */ 8352 asm volatile("vmcall;" 8353 ".Lxbegin: xbegin .Lskip_rtm;" 8354 "xend;" 8355 ".Lskip_rtm:"); 8356 } 8357 8358 /* 8359 * Clear the pending debug exceptions and RFLAGS.TF and re-enter 8360 * L2. No #DB is delivered and L2 continues to the next point of 8361 * interest. 8362 */ 8363 static void dismiss_db(void) 8364 { 8365 vmcs_write(GUEST_PENDING_DEBUG, 0); 8366 vmcs_write(GUEST_RFLAGS, X86_EFLAGS_FIXED); 8367 enter_guest(); 8368 } 8369 8370 /* 8371 * Check a variety of VMCS fields relevant to an intercepted #DB exception. 8372 * Then throw away the #DB exception and resume L2. 8373 */ 8374 static void check_db_exit(bool xfail_qual, bool xfail_dr6, bool xfail_pdbg, 8375 void *expected_rip, u64 expected_exit_qual, 8376 u64 expected_dr6) 8377 { 8378 u32 reason = vmcs_read(EXI_REASON); 8379 u32 intr_info = vmcs_read(EXI_INTR_INFO); 8380 u64 exit_qual = vmcs_read(EXI_QUALIFICATION); 8381 u64 guest_rip = vmcs_read(GUEST_RIP); 8382 u64 guest_pending_dbg = vmcs_read(GUEST_PENDING_DEBUG); 8383 u64 dr6 = read_dr6(); 8384 const u32 expected_intr_info = INTR_INFO_VALID_MASK | 8385 INTR_TYPE_HARD_EXCEPTION | DB_VECTOR; 8386 8387 report(reason == VMX_EXC_NMI && intr_info == expected_intr_info, 8388 "Expected #DB VM-exit"); 8389 report((u64)expected_rip == guest_rip, "Expected RIP %p (actual %lx)", 8390 expected_rip, guest_rip); 8391 report_xfail(xfail_pdbg, 0 == guest_pending_dbg, 8392 "Expected pending debug exceptions 0 (actual %lx)", 8393 guest_pending_dbg); 8394 report_xfail(xfail_qual, expected_exit_qual == exit_qual, 8395 "Expected exit qualification %lx (actual %lx)", 8396 expected_exit_qual, exit_qual); 8397 report_xfail(xfail_dr6, expected_dr6 == dr6, 8398 "Expected DR6 %lx (actual %lx)", expected_dr6, dr6); 8399 dismiss_db(); 8400 } 8401 8402 /* 8403 * Assuming the guest has just exited on a VMCALL instruction, skip 8404 * over the vmcall, and set the guest's RFLAGS.TF in the VMCS. If 8405 * pending debug exceptions are non-zero, set the VMCS up as if the 8406 * previous instruction was a MOVSS that generated the indicated 8407 * pending debug exceptions. Then enter L2. 8408 */ 8409 static void single_step_guest(const char *test_name, u64 starting_dr6, 8410 u64 pending_debug_exceptions) 8411 { 8412 printf("\n%s\n", test_name); 8413 skip_exit_vmcall(); 8414 write_dr6(starting_dr6); 8415 vmcs_write(GUEST_RFLAGS, X86_EFLAGS_FIXED | X86_EFLAGS_TF); 8416 if (pending_debug_exceptions) { 8417 vmcs_write(GUEST_PENDING_DEBUG, pending_debug_exceptions); 8418 vmcs_write(GUEST_INTR_STATE, GUEST_INTR_STATE_MOVSS); 8419 } 8420 enter_guest(); 8421 } 8422 8423 /* 8424 * When L1 intercepts #DB, verify that a single-step trap clears 8425 * pending debug exceptions, populates the exit qualification field 8426 * properly, and that DR6 is not prematurely clobbered. In a 8427 * (simulated) MOVSS shadow, make sure that the pending debug 8428 * exception bits are properly accumulated into the exit qualification 8429 * field. 8430 */ 8431 static void vmx_db_test(void) 8432 { 8433 /* 8434 * We are going to set a few arbitrary bits in DR6 to verify that 8435 * (a) DR6 is not modified by an intercepted #DB, and 8436 * (b) stale bits in DR6 (DR6.BD, in particular) don't leak into 8437 * the exit qualification field for a subsequent #DB exception. 8438 */ 8439 const u64 starting_dr6 = DR6_RESERVED | BIT(13) | DR_TRAP3 | DR_TRAP1; 8440 extern char post_nop asm(".Lpost_nop"); 8441 extern char post_movss_nop asm(".Lpost_movss_nop"); 8442 extern char post_wbinvd asm(".Lpost_wbinvd"); 8443 extern char post_movss_wbinvd asm(".Lpost_movss_wbinvd"); 8444 extern char xbegin asm(".Lxbegin"); 8445 extern char skip_rtm asm(".Lskip_rtm"); 8446 8447 /* 8448 * L1 wants to intercept #DB exceptions encountered in L2. 8449 */ 8450 vmcs_write(EXC_BITMAP, BIT(DB_VECTOR)); 8451 8452 /* 8453 * Start L2 and run it up to the first point of interest. 8454 */ 8455 test_set_guest(vmx_db_test_guest); 8456 enter_guest(); 8457 8458 /* 8459 * Hardware-delivered #DB trap for single-step sets the 8460 * standard that L0 has to follow for emulated instructions. 8461 */ 8462 single_step_guest("Hardware delivered single-step", starting_dr6, 0); 8463 check_db_exit(false, false, false, &post_nop, DR_STEP, starting_dr6); 8464 8465 /* 8466 * Hardware-delivered #DB trap for single-step in MOVSS shadow 8467 * also sets the standard that L0 has to follow for emulated 8468 * instructions. Here, we establish the VMCS pending debug 8469 * exceptions to indicate that the simulated MOVSS triggered a 8470 * data breakpoint as well as the single-step trap. 8471 */ 8472 single_step_guest("Hardware delivered single-step in MOVSS shadow", 8473 starting_dr6, BIT(12) | DR_STEP | DR_TRAP0 ); 8474 check_db_exit(false, false, false, &post_movss_nop, DR_STEP | DR_TRAP0, 8475 starting_dr6); 8476 8477 /* 8478 * L0 synthesized #DB trap for single-step is buggy, because 8479 * kvm (a) clobbers DR6 too early, and (b) tries its best to 8480 * reconstitute the exit qualification from the prematurely 8481 * modified DR6, but fails miserably. 8482 */ 8483 single_step_guest("Software synthesized single-step", starting_dr6, 0); 8484 check_db_exit(false, false, false, &post_wbinvd, DR_STEP, starting_dr6); 8485 8486 /* 8487 * L0 synthesized #DB trap for single-step in MOVSS shadow is 8488 * even worse, because L0 also leaves the pending debug 8489 * exceptions in the VMCS instead of accumulating them into 8490 * the exit qualification field for the #DB exception. 8491 */ 8492 single_step_guest("Software synthesized single-step in MOVSS shadow", 8493 starting_dr6, BIT(12) | DR_STEP | DR_TRAP0); 8494 check_db_exit(true, false, true, &post_movss_wbinvd, DR_STEP | DR_TRAP0, 8495 starting_dr6); 8496 8497 /* 8498 * Optional RTM test for hardware that supports RTM, to 8499 * demonstrate that the current volume 3 of the SDM 8500 * (325384-067US), table 27-1 is incorrect. Bit 16 of the exit 8501 * qualification for debug exceptions is not reserved. It is 8502 * set to 1 if a debug exception (#DB) or a breakpoint 8503 * exception (#BP) occurs inside an RTM region while advanced 8504 * debugging of RTM transactional regions is enabled. 8505 */ 8506 if (this_cpu_has(X86_FEATURE_RTM)) { 8507 vmcs_write(ENT_CONTROLS, 8508 vmcs_read(ENT_CONTROLS) | ENT_LOAD_DBGCTLS); 8509 /* 8510 * Set DR7.RTM[bit 11] and IA32_DEBUGCTL.RTM[bit 15] 8511 * in the guest to enable advanced debugging of RTM 8512 * transactional regions. 8513 */ 8514 vmcs_write(GUEST_DR7, BIT(11)); 8515 vmcs_write(GUEST_DEBUGCTL, BIT(15)); 8516 single_step_guest("Hardware delivered single-step in " 8517 "transactional region", starting_dr6, 0); 8518 check_db_exit(false, false, false, &xbegin, BIT(16), 8519 starting_dr6); 8520 } else { 8521 vmcs_write(GUEST_RIP, (u64)&skip_rtm); 8522 enter_guest(); 8523 } 8524 } 8525 8526 static void enable_vid(void) 8527 { 8528 void *virtual_apic_page; 8529 8530 assert(cpu_has_apicv()); 8531 8532 disable_intercept_for_x2apic_msrs(); 8533 8534 virtual_apic_page = alloc_page(); 8535 vmcs_write(APIC_VIRT_ADDR, (u64)virtual_apic_page); 8536 8537 vmcs_set_bits(PIN_CONTROLS, PIN_EXTINT); 8538 8539 vmcs_write(EOI_EXIT_BITMAP0, 0x0); 8540 vmcs_write(EOI_EXIT_BITMAP1, 0x0); 8541 vmcs_write(EOI_EXIT_BITMAP2, 0x0); 8542 vmcs_write(EOI_EXIT_BITMAP3, 0x0); 8543 8544 vmcs_set_bits(CPU_EXEC_CTRL0, CPU_SECONDARY | CPU_TPR_SHADOW); 8545 vmcs_set_bits(CPU_EXEC_CTRL1, CPU_VINTD | CPU_VIRT_X2APIC); 8546 } 8547 8548 static void trigger_ioapic_scan_thread(void *data) 8549 { 8550 /* Wait until other CPU entered L2 */ 8551 while (vmx_get_test_stage() != 1) 8552 ; 8553 8554 /* Trigger ioapic scan */ 8555 ioapic_set_redir(0xf, 0x79, TRIGGER_LEVEL); 8556 vmx_set_test_stage(2); 8557 } 8558 8559 static void irq_79_handler_guest(isr_regs_t *regs) 8560 { 8561 eoi(); 8562 8563 /* L1 expects vmexit on VMX_VMCALL and not VMX_EOI_INDUCED */ 8564 vmcall(); 8565 } 8566 8567 /* 8568 * Constant for num of busy-loop iterations after which 8569 * a timer interrupt should have happened in host 8570 */ 8571 #define TIMER_INTERRUPT_DELAY 100000000 8572 8573 static void vmx_eoi_bitmap_ioapic_scan_test_guest(void) 8574 { 8575 handle_irq(0x79, irq_79_handler_guest); 8576 irq_enable(); 8577 8578 /* Signal to L1 CPU to trigger ioapic scan */ 8579 vmx_set_test_stage(1); 8580 /* Wait until L1 CPU to trigger ioapic scan */ 8581 while (vmx_get_test_stage() != 2) 8582 ; 8583 8584 /* 8585 * Wait for L0 timer interrupt to be raised while we run in L2 8586 * such that L0 will process the IOAPIC scan request before 8587 * resuming L2 8588 */ 8589 delay(TIMER_INTERRUPT_DELAY); 8590 8591 asm volatile ("int $0x79"); 8592 } 8593 8594 static void vmx_eoi_bitmap_ioapic_scan_test(void) 8595 { 8596 if (!cpu_has_apicv() || (cpu_count() < 2)) { 8597 report_skip(__func__); 8598 return; 8599 } 8600 8601 enable_vid(); 8602 8603 on_cpu_async(1, trigger_ioapic_scan_thread, NULL); 8604 test_set_guest(vmx_eoi_bitmap_ioapic_scan_test_guest); 8605 8606 /* 8607 * Launch L2. 8608 * We expect the exit reason to be VMX_VMCALL (and not EOI INDUCED). 8609 * In case the reason isn't VMX_VMCALL, the asserion inside 8610 * skip_exit_vmcall() will fail. 8611 */ 8612 enter_guest(); 8613 skip_exit_vmcall(); 8614 8615 /* Let L2 finish */ 8616 enter_guest(); 8617 report(1, __func__); 8618 } 8619 8620 #define HLT_WITH_RVI_VECTOR (0xf1) 8621 8622 bool vmx_hlt_with_rvi_guest_isr_fired; 8623 static void vmx_hlt_with_rvi_guest_isr(isr_regs_t *regs) 8624 { 8625 vmx_hlt_with_rvi_guest_isr_fired = true; 8626 eoi(); 8627 } 8628 8629 static void vmx_hlt_with_rvi_guest(void) 8630 { 8631 handle_irq(HLT_WITH_RVI_VECTOR, vmx_hlt_with_rvi_guest_isr); 8632 8633 irq_enable(); 8634 asm volatile ("nop"); 8635 8636 vmcall(); 8637 } 8638 8639 static void vmx_hlt_with_rvi_test(void) 8640 { 8641 if (!cpu_has_apicv()) { 8642 report_skip(__func__); 8643 return; 8644 } 8645 8646 enable_vid(); 8647 8648 vmx_hlt_with_rvi_guest_isr_fired = false; 8649 test_set_guest(vmx_hlt_with_rvi_guest); 8650 8651 enter_guest(); 8652 skip_exit_vmcall(); 8653 8654 vmcs_write(GUEST_ACTV_STATE, ACTV_HLT); 8655 vmcs_write(GUEST_INT_STATUS, HLT_WITH_RVI_VECTOR); 8656 enter_guest(); 8657 8658 report(vmx_hlt_with_rvi_guest_isr_fired, "Interrupt raised in guest"); 8659 } 8660 8661 static void set_irq_line_thread(void *data) 8662 { 8663 /* Wait until other CPU entered L2 */ 8664 while (vmx_get_test_stage() != 1) 8665 ; 8666 8667 /* Set irq-line 0xf to raise vector 0x78 for vCPU 0 */ 8668 ioapic_set_redir(0xf, 0x78, TRIGGER_LEVEL); 8669 vmx_set_test_stage(2); 8670 } 8671 8672 static bool irq_78_handler_vmcall_before_eoi; 8673 static void irq_78_handler_guest(isr_regs_t *regs) 8674 { 8675 set_irq_line(0xf, 0); 8676 if (irq_78_handler_vmcall_before_eoi) 8677 vmcall(); 8678 eoi(); 8679 vmcall(); 8680 } 8681 8682 static void vmx_apic_passthrough_guest(void) 8683 { 8684 handle_irq(0x78, irq_78_handler_guest); 8685 irq_enable(); 8686 8687 /* If requested, wait for other CPU to trigger ioapic scan */ 8688 if (vmx_get_test_stage() < 1) { 8689 vmx_set_test_stage(1); 8690 while (vmx_get_test_stage() != 2) 8691 ; 8692 } 8693 8694 set_irq_line(0xf, 1); 8695 } 8696 8697 static void vmx_apic_passthrough(bool set_irq_line_from_thread) 8698 { 8699 if (set_irq_line_from_thread && (cpu_count() < 2)) { 8700 report_skip(__func__); 8701 return; 8702 } 8703 8704 /* Test device is required for generating IRQs */ 8705 if (!test_device_enabled()) { 8706 report_skip(__func__); 8707 return; 8708 } 8709 u64 cpu_ctrl_0 = CPU_SECONDARY; 8710 u64 cpu_ctrl_1 = 0; 8711 8712 disable_intercept_for_x2apic_msrs(); 8713 8714 vmcs_write(PIN_CONTROLS, vmcs_read(PIN_CONTROLS) & ~PIN_EXTINT); 8715 8716 vmcs_write(CPU_EXEC_CTRL0, vmcs_read(CPU_EXEC_CTRL0) | cpu_ctrl_0); 8717 vmcs_write(CPU_EXEC_CTRL1, vmcs_read(CPU_EXEC_CTRL1) | cpu_ctrl_1); 8718 8719 if (set_irq_line_from_thread) { 8720 irq_78_handler_vmcall_before_eoi = false; 8721 on_cpu_async(1, set_irq_line_thread, NULL); 8722 } else { 8723 irq_78_handler_vmcall_before_eoi = true; 8724 ioapic_set_redir(0xf, 0x78, TRIGGER_LEVEL); 8725 vmx_set_test_stage(2); 8726 } 8727 test_set_guest(vmx_apic_passthrough_guest); 8728 8729 if (irq_78_handler_vmcall_before_eoi) { 8730 /* Before EOI remote_irr should still be set */ 8731 enter_guest(); 8732 skip_exit_vmcall(); 8733 TEST_ASSERT_EQ_MSG(1, (int)ioapic_read_redir(0xf).remote_irr, 8734 "IOAPIC pass-through: remote_irr=1 before EOI"); 8735 } 8736 8737 /* After EOI remote_irr should be cleared */ 8738 enter_guest(); 8739 skip_exit_vmcall(); 8740 TEST_ASSERT_EQ_MSG(0, (int)ioapic_read_redir(0xf).remote_irr, 8741 "IOAPIC pass-through: remote_irr=0 after EOI"); 8742 8743 /* Let L2 finish */ 8744 enter_guest(); 8745 report(1, __func__); 8746 } 8747 8748 static void vmx_apic_passthrough_test(void) 8749 { 8750 vmx_apic_passthrough(false); 8751 } 8752 8753 static void vmx_apic_passthrough_thread_test(void) 8754 { 8755 vmx_apic_passthrough(true); 8756 } 8757 8758 static void vmx_apic_passthrough_tpr_threshold_guest(void) 8759 { 8760 cli(); 8761 apic_set_tpr(0); 8762 } 8763 8764 static bool vmx_apic_passthrough_tpr_threshold_ipi_isr_fired; 8765 static void vmx_apic_passthrough_tpr_threshold_ipi_isr(isr_regs_t *regs) 8766 { 8767 vmx_apic_passthrough_tpr_threshold_ipi_isr_fired = true; 8768 eoi(); 8769 } 8770 8771 static void vmx_apic_passthrough_tpr_threshold_test(void) 8772 { 8773 int ipi_vector = 0xe1; 8774 8775 disable_intercept_for_x2apic_msrs(); 8776 vmcs_clear_bits(PIN_CONTROLS, PIN_EXTINT); 8777 8778 /* Raise L0 TPR-threshold by queueing vector in LAPIC IRR */ 8779 cli(); 8780 apic_set_tpr((ipi_vector >> 4) + 1); 8781 apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL | 8782 APIC_DM_FIXED | ipi_vector, 8783 0); 8784 8785 test_set_guest(vmx_apic_passthrough_tpr_threshold_guest); 8786 enter_guest(); 8787 8788 report(apic_get_tpr() == 0, "TPR was zero by guest"); 8789 8790 /* Clean pending self-IPI */ 8791 vmx_apic_passthrough_tpr_threshold_ipi_isr_fired = false; 8792 handle_irq(ipi_vector, vmx_apic_passthrough_tpr_threshold_ipi_isr); 8793 sti(); 8794 asm volatile ("nop"); 8795 report(vmx_apic_passthrough_tpr_threshold_ipi_isr_fired, "self-IPI fired"); 8796 8797 report(1, __func__); 8798 } 8799 8800 static u64 init_signal_test_exit_reason; 8801 static bool init_signal_test_thread_continued; 8802 8803 static void init_signal_test_thread(void *data) 8804 { 8805 struct vmcs *test_vmcs = data; 8806 8807 /* Enter VMX operation (i.e. exec VMXON) */ 8808 u64 *ap_vmxon_region = alloc_page(); 8809 enable_vmx(); 8810 init_vmx(ap_vmxon_region); 8811 _vmx_on(ap_vmxon_region); 8812 8813 /* Signal CPU have entered VMX operation */ 8814 vmx_set_test_stage(1); 8815 8816 /* Wait for BSP CPU to send INIT signal */ 8817 while (vmx_get_test_stage() != 2) 8818 ; 8819 8820 /* 8821 * Signal that we continue as usual as INIT signal 8822 * should be blocked while CPU is in VMX operation 8823 */ 8824 vmx_set_test_stage(3); 8825 8826 /* Wait for signal to enter VMX non-root mode */ 8827 while (vmx_get_test_stage() != 4) 8828 ; 8829 8830 /* Enter VMX non-root mode */ 8831 test_set_guest(v2_null_test_guest); 8832 make_vmcs_current(test_vmcs); 8833 enter_guest(); 8834 /* Save exit reason for BSP CPU to compare to expected result */ 8835 init_signal_test_exit_reason = vmcs_read(EXI_REASON); 8836 /* VMCLEAR test-vmcs so it could be loaded by BSP CPU */ 8837 vmcs_clear(test_vmcs); 8838 launched = false; 8839 /* Signal that CPU exited to VMX root mode */ 8840 vmx_set_test_stage(5); 8841 8842 /* Wait for BSP CPU to signal to exit VMX operation */ 8843 while (vmx_get_test_stage() != 6) 8844 ; 8845 8846 /* Exit VMX operation (i.e. exec VMXOFF) */ 8847 vmx_off(); 8848 8849 /* 8850 * Signal to BSP CPU that we continue as usual as INIT signal 8851 * should have been consumed by VMX_INIT exit from guest 8852 */ 8853 vmx_set_test_stage(7); 8854 8855 /* Wait for BSP CPU to signal to enter VMX operation */ 8856 while (vmx_get_test_stage() != 8) 8857 ; 8858 /* Enter VMX operation (i.e. exec VMXON) */ 8859 _vmx_on(ap_vmxon_region); 8860 /* Signal to BSP we are in VMX operation */ 8861 vmx_set_test_stage(9); 8862 8863 /* Wait for BSP CPU to send INIT signal */ 8864 while (vmx_get_test_stage() != 10) 8865 ; 8866 8867 /* Exit VMX operation (i.e. exec VMXOFF) */ 8868 vmx_off(); 8869 8870 /* 8871 * Exiting VMX operation should result in latched 8872 * INIT signal being processed. Therefore, we should 8873 * never reach the below code. Thus, signal to BSP 8874 * CPU if we have reached here so it is able to 8875 * report an issue if it happens. 8876 */ 8877 init_signal_test_thread_continued = true; 8878 } 8879 8880 #define INIT_SIGNAL_TEST_DELAY 100000000ULL 8881 8882 static void vmx_init_signal_test(void) 8883 { 8884 struct vmcs *test_vmcs; 8885 8886 if (cpu_count() < 2) { 8887 report_skip(__func__); 8888 return; 8889 } 8890 8891 /* VMCLEAR test-vmcs so it could be loaded by other CPU */ 8892 vmcs_save(&test_vmcs); 8893 vmcs_clear(test_vmcs); 8894 8895 vmx_set_test_stage(0); 8896 on_cpu_async(1, init_signal_test_thread, test_vmcs); 8897 8898 /* Wait for other CPU to enter VMX operation */ 8899 while (vmx_get_test_stage() != 1) 8900 ; 8901 8902 /* Send INIT signal to other CPU */ 8903 apic_icr_write(APIC_DEST_PHYSICAL | APIC_DM_INIT | APIC_INT_ASSERT, 8904 id_map[1]); 8905 /* Signal other CPU we have sent INIT signal */ 8906 vmx_set_test_stage(2); 8907 8908 /* 8909 * Wait reasonable amount of time for INIT signal to 8910 * be received on other CPU and verify that other CPU 8911 * have proceed as usual to next test stage as INIT 8912 * signal should be blocked while other CPU in 8913 * VMX operation 8914 */ 8915 delay(INIT_SIGNAL_TEST_DELAY); 8916 report(vmx_get_test_stage() == 3, 8917 "INIT signal blocked when CPU in VMX operation"); 8918 /* No point to continue if we failed at this point */ 8919 if (vmx_get_test_stage() != 3) 8920 return; 8921 8922 /* Signal other CPU to enter VMX non-root mode */ 8923 init_signal_test_exit_reason = -1ull; 8924 vmx_set_test_stage(4); 8925 /* 8926 * Wait reasonable amont of time for other CPU 8927 * to exit to VMX root mode 8928 */ 8929 delay(INIT_SIGNAL_TEST_DELAY); 8930 if (vmx_get_test_stage() != 5) { 8931 report(false, "Pending INIT signal didn't result in VMX exit"); 8932 return; 8933 } 8934 report(init_signal_test_exit_reason == VMX_INIT, 8935 "INIT signal during VMX non-root mode result in exit-reason %s (%lu)", 8936 exit_reason_description(init_signal_test_exit_reason), 8937 init_signal_test_exit_reason); 8938 8939 /* Run guest to completion */ 8940 make_vmcs_current(test_vmcs); 8941 enter_guest(); 8942 8943 /* Signal other CPU to exit VMX operation */ 8944 init_signal_test_thread_continued = false; 8945 vmx_set_test_stage(6); 8946 8947 /* Wait reasonable amount of time for other CPU to exit VMX operation */ 8948 delay(INIT_SIGNAL_TEST_DELAY); 8949 report(vmx_get_test_stage() == 7, 8950 "INIT signal consumed on VMX_INIT exit"); 8951 /* No point to continue if we failed at this point */ 8952 if (vmx_get_test_stage() != 7) 8953 return; 8954 8955 /* Signal other CPU to enter VMX operation */ 8956 vmx_set_test_stage(8); 8957 /* Wait for other CPU to enter VMX operation */ 8958 while (vmx_get_test_stage() != 9) 8959 ; 8960 8961 /* Send INIT signal to other CPU */ 8962 apic_icr_write(APIC_DEST_PHYSICAL | APIC_DM_INIT | APIC_INT_ASSERT, 8963 id_map[1]); 8964 /* Signal other CPU we have sent INIT signal */ 8965 vmx_set_test_stage(10); 8966 8967 /* 8968 * Wait reasonable amount of time for other CPU 8969 * to exit VMX operation and process INIT signal 8970 */ 8971 delay(INIT_SIGNAL_TEST_DELAY); 8972 report(!init_signal_test_thread_continued, 8973 "INIT signal processed after exit VMX operation"); 8974 8975 /* 8976 * TODO: Send SIPI to other CPU to sipi_entry (See x86/cstart64.S) 8977 * to re-init it to kvm-unit-tests standard environment. 8978 * Somehow (?) verify that SIPI was indeed received. 8979 */ 8980 } 8981 8982 enum vmcs_access { 8983 ACCESS_VMREAD, 8984 ACCESS_VMWRITE, 8985 ACCESS_NONE, 8986 }; 8987 8988 struct vmcs_shadow_test_common { 8989 enum vmcs_access op; 8990 enum Reason reason; 8991 u64 field; 8992 u64 value; 8993 u64 flags; 8994 u64 time; 8995 } l1_l2_common; 8996 8997 static inline u64 vmread_flags(u64 field, u64 *val) 8998 { 8999 u64 flags; 9000 9001 asm volatile ("vmread %2, %1; pushf; pop %0" 9002 : "=r" (flags), "=rm" (*val) : "r" (field) : "cc"); 9003 return flags & X86_EFLAGS_ALU; 9004 } 9005 9006 static inline u64 vmwrite_flags(u64 field, u64 val) 9007 { 9008 u64 flags; 9009 9010 asm volatile ("vmwrite %1, %2; pushf; pop %0" 9011 : "=r"(flags) : "rm" (val), "r" (field) : "cc"); 9012 return flags & X86_EFLAGS_ALU; 9013 } 9014 9015 static void vmx_vmcs_shadow_test_guest(void) 9016 { 9017 struct vmcs_shadow_test_common *c = &l1_l2_common; 9018 u64 start; 9019 9020 while (c->op != ACCESS_NONE) { 9021 start = rdtsc(); 9022 switch (c->op) { 9023 default: 9024 c->flags = -1ull; 9025 break; 9026 case ACCESS_VMREAD: 9027 c->flags = vmread_flags(c->field, &c->value); 9028 break; 9029 case ACCESS_VMWRITE: 9030 c->flags = vmwrite_flags(c->field, 0); 9031 break; 9032 } 9033 c->time = rdtsc() - start; 9034 vmcall(); 9035 } 9036 } 9037 9038 static u64 vmread_from_shadow(u64 field) 9039 { 9040 struct vmcs *primary; 9041 struct vmcs *shadow; 9042 u64 value; 9043 9044 TEST_ASSERT(!vmcs_save(&primary)); 9045 shadow = (struct vmcs *)vmcs_read(VMCS_LINK_PTR); 9046 TEST_ASSERT(!make_vmcs_current(shadow)); 9047 value = vmcs_read(field); 9048 TEST_ASSERT(!make_vmcs_current(primary)); 9049 return value; 9050 } 9051 9052 static u64 vmwrite_to_shadow(u64 field, u64 value) 9053 { 9054 struct vmcs *primary; 9055 struct vmcs *shadow; 9056 9057 TEST_ASSERT(!vmcs_save(&primary)); 9058 shadow = (struct vmcs *)vmcs_read(VMCS_LINK_PTR); 9059 TEST_ASSERT(!make_vmcs_current(shadow)); 9060 vmcs_write(field, value); 9061 value = vmcs_read(field); 9062 TEST_ASSERT(!make_vmcs_current(primary)); 9063 return value; 9064 } 9065 9066 static void vmcs_shadow_test_access(u8 *bitmap[2], enum vmcs_access access) 9067 { 9068 struct vmcs_shadow_test_common *c = &l1_l2_common; 9069 9070 c->op = access; 9071 vmcs_write(VMX_INST_ERROR, 0); 9072 enter_guest(); 9073 c->reason = vmcs_read(EXI_REASON) & 0xffff; 9074 if (c->reason != VMX_VMCALL) { 9075 skip_exit_insn(); 9076 enter_guest(); 9077 } 9078 skip_exit_vmcall(); 9079 } 9080 9081 static void vmcs_shadow_test_field(u8 *bitmap[2], u64 field) 9082 { 9083 struct vmcs_shadow_test_common *c = &l1_l2_common; 9084 struct vmcs *shadow; 9085 u64 value; 9086 uintptr_t flags[2]; 9087 bool good_shadow; 9088 u32 vmx_inst_error; 9089 9090 report_prefix_pushf("field %lx", field); 9091 c->field = field; 9092 9093 shadow = (struct vmcs *)vmcs_read(VMCS_LINK_PTR); 9094 if (shadow != (struct vmcs *)-1ull) { 9095 flags[ACCESS_VMREAD] = vmread_flags(field, &value); 9096 flags[ACCESS_VMWRITE] = vmwrite_flags(field, value); 9097 good_shadow = !flags[ACCESS_VMREAD] && !flags[ACCESS_VMWRITE]; 9098 } else { 9099 /* 9100 * When VMCS link pointer is -1ull, VMWRITE/VMREAD on 9101 * shadowed-fields should fail with setting RFLAGS.CF. 9102 */ 9103 flags[ACCESS_VMREAD] = X86_EFLAGS_CF; 9104 flags[ACCESS_VMWRITE] = X86_EFLAGS_CF; 9105 good_shadow = false; 9106 } 9107 9108 /* Intercept both VMREAD and VMWRITE. */ 9109 report_prefix_push("no VMREAD/VMWRITE permission"); 9110 /* VMWRITE/VMREAD done on reserved-bit should always intercept */ 9111 if (!(field >> VMCS_FIELD_RESERVED_SHIFT)) { 9112 set_bit(field, bitmap[ACCESS_VMREAD]); 9113 set_bit(field, bitmap[ACCESS_VMWRITE]); 9114 } 9115 vmcs_shadow_test_access(bitmap, ACCESS_VMWRITE); 9116 report(c->reason == VMX_VMWRITE, "not shadowed for VMWRITE"); 9117 vmcs_shadow_test_access(bitmap, ACCESS_VMREAD); 9118 report(c->reason == VMX_VMREAD, "not shadowed for VMREAD"); 9119 report_prefix_pop(); 9120 9121 if (field >> VMCS_FIELD_RESERVED_SHIFT) 9122 goto out; 9123 9124 /* Permit shadowed VMREAD. */ 9125 report_prefix_push("VMREAD permission only"); 9126 clear_bit(field, bitmap[ACCESS_VMREAD]); 9127 set_bit(field, bitmap[ACCESS_VMWRITE]); 9128 if (good_shadow) 9129 value = vmwrite_to_shadow(field, MAGIC_VAL_1 + field); 9130 vmcs_shadow_test_access(bitmap, ACCESS_VMWRITE); 9131 report(c->reason == VMX_VMWRITE, "not shadowed for VMWRITE"); 9132 vmcs_shadow_test_access(bitmap, ACCESS_VMREAD); 9133 vmx_inst_error = vmcs_read(VMX_INST_ERROR); 9134 report(c->reason == VMX_VMCALL, "shadowed for VMREAD (in %ld cycles)", 9135 c->time); 9136 report(c->flags == flags[ACCESS_VMREAD], 9137 "ALU flags after VMREAD (%lx) are as expected (%lx)", 9138 c->flags, flags[ACCESS_VMREAD]); 9139 if (good_shadow) 9140 report(c->value == value, 9141 "value read from shadow (%lx) is as expected (%lx)", 9142 c->value, value); 9143 else if (shadow != (struct vmcs *)-1ull && flags[ACCESS_VMREAD]) 9144 report(vmx_inst_error == VMXERR_UNSUPPORTED_VMCS_COMPONENT, 9145 "VMX_INST_ERROR (%d) is as expected (%d)", 9146 vmx_inst_error, VMXERR_UNSUPPORTED_VMCS_COMPONENT); 9147 report_prefix_pop(); 9148 9149 /* Permit shadowed VMWRITE. */ 9150 report_prefix_push("VMWRITE permission only"); 9151 set_bit(field, bitmap[ACCESS_VMREAD]); 9152 clear_bit(field, bitmap[ACCESS_VMWRITE]); 9153 if (good_shadow) 9154 vmwrite_to_shadow(field, MAGIC_VAL_1 + field); 9155 vmcs_shadow_test_access(bitmap, ACCESS_VMWRITE); 9156 vmx_inst_error = vmcs_read(VMX_INST_ERROR); 9157 report(c->reason == VMX_VMCALL, 9158 "shadowed for VMWRITE (in %ld cycles)", 9159 c->time); 9160 report(c->flags == flags[ACCESS_VMREAD], 9161 "ALU flags after VMWRITE (%lx) are as expected (%lx)", 9162 c->flags, flags[ACCESS_VMREAD]); 9163 if (good_shadow) { 9164 value = vmread_from_shadow(field); 9165 report(value == 0, 9166 "shadow VMCS value (%lx) is as expected (%lx)", value, 9167 0ul); 9168 } else if (shadow != (struct vmcs *)-1ull && flags[ACCESS_VMWRITE]) { 9169 report(vmx_inst_error == VMXERR_UNSUPPORTED_VMCS_COMPONENT, 9170 "VMX_INST_ERROR (%d) is as expected (%d)", 9171 vmx_inst_error, VMXERR_UNSUPPORTED_VMCS_COMPONENT); 9172 } 9173 vmcs_shadow_test_access(bitmap, ACCESS_VMREAD); 9174 report(c->reason == VMX_VMREAD, "not shadowed for VMREAD"); 9175 report_prefix_pop(); 9176 9177 /* Permit shadowed VMREAD and VMWRITE. */ 9178 report_prefix_push("VMREAD and VMWRITE permission"); 9179 clear_bit(field, bitmap[ACCESS_VMREAD]); 9180 clear_bit(field, bitmap[ACCESS_VMWRITE]); 9181 if (good_shadow) 9182 vmwrite_to_shadow(field, MAGIC_VAL_1 + field); 9183 vmcs_shadow_test_access(bitmap, ACCESS_VMWRITE); 9184 vmx_inst_error = vmcs_read(VMX_INST_ERROR); 9185 report(c->reason == VMX_VMCALL, 9186 "shadowed for VMWRITE (in %ld cycles)", 9187 c->time); 9188 report(c->flags == flags[ACCESS_VMREAD], 9189 "ALU flags after VMWRITE (%lx) are as expected (%lx)", 9190 c->flags, flags[ACCESS_VMREAD]); 9191 if (good_shadow) { 9192 value = vmread_from_shadow(field); 9193 report(value == 0, 9194 "shadow VMCS value (%lx) is as expected (%lx)", value, 9195 0ul); 9196 } else if (shadow != (struct vmcs *)-1ull && flags[ACCESS_VMWRITE]) { 9197 report(vmx_inst_error == VMXERR_UNSUPPORTED_VMCS_COMPONENT, 9198 "VMX_INST_ERROR (%d) is as expected (%d)", 9199 vmx_inst_error, VMXERR_UNSUPPORTED_VMCS_COMPONENT); 9200 } 9201 vmcs_shadow_test_access(bitmap, ACCESS_VMREAD); 9202 vmx_inst_error = vmcs_read(VMX_INST_ERROR); 9203 report(c->reason == VMX_VMCALL, "shadowed for VMREAD (in %ld cycles)", 9204 c->time); 9205 report(c->flags == flags[ACCESS_VMREAD], 9206 "ALU flags after VMREAD (%lx) are as expected (%lx)", 9207 c->flags, flags[ACCESS_VMREAD]); 9208 if (good_shadow) 9209 report(c->value == 0, 9210 "value read from shadow (%lx) is as expected (%lx)", 9211 c->value, 0ul); 9212 else if (shadow != (struct vmcs *)-1ull && flags[ACCESS_VMREAD]) 9213 report(vmx_inst_error == VMXERR_UNSUPPORTED_VMCS_COMPONENT, 9214 "VMX_INST_ERROR (%d) is as expected (%d)", 9215 vmx_inst_error, VMXERR_UNSUPPORTED_VMCS_COMPONENT); 9216 report_prefix_pop(); 9217 9218 out: 9219 report_prefix_pop(); 9220 } 9221 9222 static void vmx_vmcs_shadow_test_body(u8 *bitmap[2]) 9223 { 9224 unsigned base; 9225 unsigned index; 9226 unsigned bit; 9227 unsigned highest_index = rdmsr(MSR_IA32_VMX_VMCS_ENUM); 9228 9229 /* Run test on all possible valid VMCS fields */ 9230 for (base = 0; 9231 base < (1 << VMCS_FIELD_RESERVED_SHIFT); 9232 base += (1 << VMCS_FIELD_TYPE_SHIFT)) 9233 for (index = 0; index <= highest_index; index++) 9234 vmcs_shadow_test_field(bitmap, base + index); 9235 9236 /* 9237 * Run tests on some invalid VMCS fields 9238 * (Have reserved bit set). 9239 */ 9240 for (bit = VMCS_FIELD_RESERVED_SHIFT; bit < VMCS_FIELD_BIT_SIZE; bit++) 9241 vmcs_shadow_test_field(bitmap, (1ull << bit)); 9242 } 9243 9244 static void vmx_vmcs_shadow_test(void) 9245 { 9246 u8 *bitmap[2]; 9247 struct vmcs *shadow; 9248 9249 if (!(ctrl_cpu_rev[0].clr & CPU_SECONDARY)) { 9250 printf("\t'Activate secondary controls' not supported.\n"); 9251 return; 9252 } 9253 9254 if (!(ctrl_cpu_rev[1].clr & CPU_SHADOW_VMCS)) { 9255 printf("\t'VMCS shadowing' not supported.\n"); 9256 return; 9257 } 9258 9259 if (!(rdmsr(MSR_IA32_VMX_MISC) & 9260 MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS)) { 9261 printf("\tVMWRITE can't modify VM-exit information fields.\n"); 9262 return; 9263 } 9264 9265 test_set_guest(vmx_vmcs_shadow_test_guest); 9266 9267 bitmap[ACCESS_VMREAD] = alloc_page(); 9268 bitmap[ACCESS_VMWRITE] = alloc_page(); 9269 9270 vmcs_write(VMREAD_BITMAP, virt_to_phys(bitmap[ACCESS_VMREAD])); 9271 vmcs_write(VMWRITE_BITMAP, virt_to_phys(bitmap[ACCESS_VMWRITE])); 9272 9273 shadow = alloc_page(); 9274 shadow->hdr.revision_id = basic.revision; 9275 shadow->hdr.shadow_vmcs = 1; 9276 TEST_ASSERT(!vmcs_clear(shadow)); 9277 9278 vmcs_clear_bits(CPU_EXEC_CTRL0, CPU_RDTSC); 9279 vmcs_set_bits(CPU_EXEC_CTRL0, CPU_SECONDARY); 9280 vmcs_set_bits(CPU_EXEC_CTRL1, CPU_SHADOW_VMCS); 9281 9282 vmcs_write(VMCS_LINK_PTR, virt_to_phys(shadow)); 9283 report_prefix_push("valid link pointer"); 9284 vmx_vmcs_shadow_test_body(bitmap); 9285 report_prefix_pop(); 9286 9287 vmcs_write(VMCS_LINK_PTR, -1ull); 9288 report_prefix_push("invalid link pointer"); 9289 vmx_vmcs_shadow_test_body(bitmap); 9290 report_prefix_pop(); 9291 9292 l1_l2_common.op = ACCESS_NONE; 9293 enter_guest(); 9294 } 9295 9296 /* 9297 * This test monitors the difference between a guest RDTSC instruction 9298 * and the IA32_TIME_STAMP_COUNTER MSR value stored in the VMCS12 9299 * VM-exit MSR-store list when taking a VM-exit on the instruction 9300 * following RDTSC. 9301 */ 9302 #define RDTSC_DIFF_ITERS 100000 9303 #define RDTSC_DIFF_FAILS 100 9304 #define HOST_CAPTURED_GUEST_TSC_DIFF_THRESHOLD 750 9305 9306 /* 9307 * Set 'use TSC offsetting' and set the guest offset to the 9308 * inverse of the host's current TSC value, so that the guest starts running 9309 * with an effective TSC value of 0. 9310 */ 9311 static void reset_guest_tsc_to_zero(void) 9312 { 9313 vmcs_set_bits(CPU_EXEC_CTRL0, CPU_USE_TSC_OFFSET); 9314 vmcs_write(TSC_OFFSET, -rdtsc()); 9315 } 9316 9317 static void rdtsc_vmexit_diff_test_guest(void) 9318 { 9319 int i; 9320 9321 for (i = 0; i < RDTSC_DIFF_ITERS; i++) 9322 /* Ensure rdtsc is the last instruction before the vmcall. */ 9323 asm volatile("rdtsc; vmcall" : : : "eax", "edx"); 9324 } 9325 9326 /* 9327 * This function only considers the "use TSC offsetting" VM-execution 9328 * control. It does not handle "use TSC scaling" (because the latter 9329 * isn't available to the host today.) 9330 */ 9331 static unsigned long long host_time_to_guest_time(unsigned long long t) 9332 { 9333 TEST_ASSERT(!(ctrl_cpu_rev[0].clr & CPU_SECONDARY) || 9334 !(vmcs_read(CPU_EXEC_CTRL1) & CPU_USE_TSC_SCALING)); 9335 9336 if (vmcs_read(CPU_EXEC_CTRL0) & CPU_USE_TSC_OFFSET) 9337 t += vmcs_read(TSC_OFFSET); 9338 9339 return t; 9340 } 9341 9342 static unsigned long long rdtsc_vmexit_diff_test_iteration(void) 9343 { 9344 unsigned long long guest_tsc, host_to_guest_tsc; 9345 9346 enter_guest(); 9347 skip_exit_vmcall(); 9348 guest_tsc = (u32) regs.rax + (regs.rdx << 32); 9349 host_to_guest_tsc = host_time_to_guest_time(exit_msr_store[0].value); 9350 9351 return host_to_guest_tsc - guest_tsc; 9352 } 9353 9354 static void rdtsc_vmexit_diff_test(void) 9355 { 9356 int fail = 0; 9357 int i; 9358 9359 if (!(ctrl_cpu_rev[0].clr & CPU_USE_TSC_OFFSET)) 9360 test_skip("CPU doesn't support the 'use TSC offsetting' processor-based VM-execution control.\n"); 9361 9362 test_set_guest(rdtsc_vmexit_diff_test_guest); 9363 9364 reset_guest_tsc_to_zero(); 9365 9366 /* 9367 * Set up the VMCS12 VM-exit MSR-store list to store just one 9368 * MSR: IA32_TIME_STAMP_COUNTER. Note that the value stored is 9369 * in the host time domain (i.e., it is not adjusted according 9370 * to the TSC multiplier and TSC offset fields in the VMCS12, 9371 * as a guest RDTSC would be.) 9372 */ 9373 exit_msr_store = alloc_page(); 9374 exit_msr_store[0].index = MSR_IA32_TSC; 9375 vmcs_write(EXI_MSR_ST_CNT, 1); 9376 vmcs_write(EXIT_MSR_ST_ADDR, virt_to_phys(exit_msr_store)); 9377 9378 for (i = 0; i < RDTSC_DIFF_ITERS; i++) { 9379 if (rdtsc_vmexit_diff_test_iteration() >= 9380 HOST_CAPTURED_GUEST_TSC_DIFF_THRESHOLD) 9381 fail++; 9382 } 9383 9384 enter_guest(); 9385 9386 report(fail < RDTSC_DIFF_FAILS, 9387 "RDTSC to VM-exit delta too high in %d of %d iterations", 9388 fail, RDTSC_DIFF_ITERS); 9389 } 9390 9391 static int invalid_msr_init(struct vmcs *vmcs) 9392 { 9393 if (!(ctrl_pin_rev.clr & PIN_PREEMPT)) { 9394 printf("\tPreemption timer is not supported\n"); 9395 return VMX_TEST_EXIT; 9396 } 9397 vmcs_write(PIN_CONTROLS, vmcs_read(PIN_CONTROLS) | PIN_PREEMPT); 9398 preempt_val = 10000000; 9399 vmcs_write(PREEMPT_TIMER_VALUE, preempt_val); 9400 preempt_scale = rdmsr(MSR_IA32_VMX_MISC) & 0x1F; 9401 9402 if (!(ctrl_exit_rev.clr & EXI_SAVE_PREEMPT)) 9403 printf("\tSave preemption value is not supported\n"); 9404 9405 vmcs_write(ENT_MSR_LD_CNT, 1); 9406 vmcs_write(ENTER_MSR_LD_ADDR, (u64)0x13370000); 9407 9408 return VMX_TEST_START; 9409 } 9410 9411 9412 static void invalid_msr_main(void) 9413 { 9414 report(0, "Invalid MSR load"); 9415 } 9416 9417 static int invalid_msr_exit_handler(union exit_reason exit_reason) 9418 { 9419 report(0, "Invalid MSR load"); 9420 print_vmexit_info(exit_reason); 9421 return VMX_TEST_EXIT; 9422 } 9423 9424 static int invalid_msr_entry_failure(struct vmentry_result *result) 9425 { 9426 report(result->exit_reason.failed_vmentry && 9427 result->exit_reason.basic == VMX_FAIL_MSR, "Invalid MSR load"); 9428 return VMX_TEST_VMEXIT; 9429 } 9430 9431 /* 9432 * The max number of MSRs in an atomic switch MSR list is: 9433 * (111B + 1) * 512 = 4096 9434 * 9435 * Each list entry consumes: 9436 * 4-byte MSR index + 4 bytes reserved + 8-byte data = 16 bytes 9437 * 9438 * Allocate 128 kB to cover max_msr_list_size (i.e., 64 kB) and then some. 9439 */ 9440 static const u32 msr_list_page_order = 5; 9441 9442 static void atomic_switch_msr_limit_test_guest(void) 9443 { 9444 vmcall(); 9445 } 9446 9447 static void populate_msr_list(struct vmx_msr_entry *msr_list, 9448 size_t byte_capacity, int count) 9449 { 9450 int i; 9451 9452 for (i = 0; i < count; i++) { 9453 msr_list[i].index = MSR_IA32_TSC; 9454 msr_list[i].reserved = 0; 9455 msr_list[i].value = 0x1234567890abcdef; 9456 } 9457 9458 memset(msr_list + count, 0xff, 9459 byte_capacity - count * sizeof(*msr_list)); 9460 } 9461 9462 static int max_msr_list_size(void) 9463 { 9464 u32 vmx_misc = rdmsr(MSR_IA32_VMX_MISC); 9465 u32 factor = ((vmx_misc & GENMASK(27, 25)) >> 25) + 1; 9466 9467 return factor * 512; 9468 } 9469 9470 static void atomic_switch_msrs_test(int count) 9471 { 9472 struct vmx_msr_entry *vm_enter_load; 9473 struct vmx_msr_entry *vm_exit_load; 9474 struct vmx_msr_entry *vm_exit_store; 9475 int max_allowed = max_msr_list_size(); 9476 int byte_capacity = 1ul << (msr_list_page_order + PAGE_SHIFT); 9477 /* Exceeding the max MSR list size at exit trigers KVM to abort. */ 9478 int exit_count = count > max_allowed ? max_allowed : count; 9479 int cleanup_count = count > max_allowed ? 2 : 1; 9480 int i; 9481 9482 /* 9483 * Check for the IA32_TSC MSR, 9484 * available with the "TSC flag" and used to populate the MSR lists. 9485 */ 9486 if (!(cpuid(1).d & (1 << 4))) { 9487 report_skip(__func__); 9488 return; 9489 } 9490 9491 /* Set L2 guest. */ 9492 test_set_guest(atomic_switch_msr_limit_test_guest); 9493 9494 /* Setup atomic MSR switch lists. */ 9495 vm_enter_load = alloc_pages(msr_list_page_order); 9496 vm_exit_load = alloc_pages(msr_list_page_order); 9497 vm_exit_store = alloc_pages(msr_list_page_order); 9498 9499 vmcs_write(ENTER_MSR_LD_ADDR, (u64)vm_enter_load); 9500 vmcs_write(EXIT_MSR_LD_ADDR, (u64)vm_exit_load); 9501 vmcs_write(EXIT_MSR_ST_ADDR, (u64)vm_exit_store); 9502 9503 /* 9504 * VM-Enter should succeed up to the max number of MSRs per list, and 9505 * should not consume junk beyond the last entry. 9506 */ 9507 populate_msr_list(vm_enter_load, byte_capacity, count); 9508 populate_msr_list(vm_exit_load, byte_capacity, exit_count); 9509 populate_msr_list(vm_exit_store, byte_capacity, exit_count); 9510 9511 vmcs_write(ENT_MSR_LD_CNT, count); 9512 vmcs_write(EXI_MSR_LD_CNT, exit_count); 9513 vmcs_write(EXI_MSR_ST_CNT, exit_count); 9514 9515 if (count <= max_allowed) { 9516 enter_guest(); 9517 assert_exit_reason(VMX_VMCALL); 9518 skip_exit_vmcall(); 9519 } else { 9520 u32 exit_qual; 9521 9522 test_guest_state("Invalid MSR Load Count", true, count, 9523 "ENT_MSR_LD_CNT"); 9524 9525 exit_qual = vmcs_read(EXI_QUALIFICATION); 9526 report(exit_qual == max_allowed + 1, "exit_qual, %u, is %u.", 9527 exit_qual, max_allowed + 1); 9528 } 9529 9530 /* Cleanup. */ 9531 vmcs_write(ENT_MSR_LD_CNT, 0); 9532 vmcs_write(EXI_MSR_LD_CNT, 0); 9533 vmcs_write(EXI_MSR_ST_CNT, 0); 9534 for (i = 0; i < cleanup_count; i++) { 9535 enter_guest(); 9536 skip_exit_vmcall(); 9537 } 9538 free_pages_by_order(vm_enter_load, msr_list_page_order); 9539 free_pages_by_order(vm_exit_load, msr_list_page_order); 9540 free_pages_by_order(vm_exit_store, msr_list_page_order); 9541 } 9542 9543 static void atomic_switch_max_msrs_test(void) 9544 { 9545 atomic_switch_msrs_test(max_msr_list_size()); 9546 } 9547 9548 static void atomic_switch_overflow_msrs_test(void) 9549 { 9550 atomic_switch_msrs_test(max_msr_list_size() + 1); 9551 } 9552 9553 #define TEST(name) { #name, .v2 = name } 9554 9555 /* name/init/guest_main/exit_handler/syscall_handler/guest_regs */ 9556 struct vmx_test vmx_tests[] = { 9557 { "null", NULL, basic_guest_main, basic_exit_handler, NULL, {0} }, 9558 { "vmenter", NULL, vmenter_main, vmenter_exit_handler, NULL, {0} }, 9559 { "preemption timer", preemption_timer_init, preemption_timer_main, 9560 preemption_timer_exit_handler, NULL, {0} }, 9561 { "control field PAT", test_ctrl_pat_init, test_ctrl_pat_main, 9562 test_ctrl_pat_exit_handler, NULL, {0} }, 9563 { "control field EFER", test_ctrl_efer_init, test_ctrl_efer_main, 9564 test_ctrl_efer_exit_handler, NULL, {0} }, 9565 { "CR shadowing", NULL, cr_shadowing_main, 9566 cr_shadowing_exit_handler, NULL, {0} }, 9567 { "I/O bitmap", iobmp_init, iobmp_main, iobmp_exit_handler, 9568 NULL, {0} }, 9569 { "instruction intercept", insn_intercept_init, insn_intercept_main, 9570 insn_intercept_exit_handler, NULL, {0} }, 9571 { "EPT A/D disabled", ept_init, ept_main, ept_exit_handler, NULL, {0} }, 9572 { "EPT A/D enabled", eptad_init, eptad_main, eptad_exit_handler, NULL, {0} }, 9573 { "PML", pml_init, pml_main, pml_exit_handler, NULL, {0} }, 9574 { "VPID", vpid_init, vpid_main, vpid_exit_handler, NULL, {0} }, 9575 { "interrupt", interrupt_init, interrupt_main, 9576 interrupt_exit_handler, NULL, {0} }, 9577 { "debug controls", dbgctls_init, dbgctls_main, dbgctls_exit_handler, 9578 NULL, {0} }, 9579 { "MSR switch", msr_switch_init, msr_switch_main, 9580 msr_switch_exit_handler, NULL, {0}, msr_switch_entry_failure }, 9581 { "vmmcall", vmmcall_init, vmmcall_main, vmmcall_exit_handler, NULL, {0} }, 9582 { "disable RDTSCP", disable_rdtscp_init, disable_rdtscp_main, 9583 disable_rdtscp_exit_handler, NULL, {0} }, 9584 { "int3", int3_init, int3_guest_main, int3_exit_handler, NULL, {0} }, 9585 { "into", into_init, into_guest_main, into_exit_handler, NULL, {0} }, 9586 { "exit_monitor_from_l2_test", NULL, exit_monitor_from_l2_main, 9587 exit_monitor_from_l2_handler, NULL, {0} }, 9588 { "invalid_msr", invalid_msr_init, invalid_msr_main, 9589 invalid_msr_exit_handler, NULL, {0}, invalid_msr_entry_failure}, 9590 /* Basic V2 tests. */ 9591 TEST(v2_null_test), 9592 TEST(v2_multiple_entries_test), 9593 TEST(fixture_test_case1), 9594 TEST(fixture_test_case2), 9595 /* Opcode tests. */ 9596 TEST(invvpid_test_v2), 9597 /* VM-entry tests */ 9598 TEST(vmx_controls_test), 9599 TEST(vmx_host_state_area_test), 9600 TEST(vmx_guest_state_area_test), 9601 TEST(vmentry_movss_shadow_test), 9602 /* APICv tests */ 9603 TEST(vmx_eoi_bitmap_ioapic_scan_test), 9604 TEST(vmx_hlt_with_rvi_test), 9605 TEST(apic_reg_virt_test), 9606 TEST(virt_x2apic_mode_test), 9607 /* APIC pass-through tests */ 9608 TEST(vmx_apic_passthrough_test), 9609 TEST(vmx_apic_passthrough_thread_test), 9610 TEST(vmx_apic_passthrough_tpr_threshold_test), 9611 TEST(vmx_init_signal_test), 9612 /* VMCS Shadowing tests */ 9613 TEST(vmx_vmcs_shadow_test), 9614 /* Regression tests */ 9615 TEST(vmx_cr_load_test), 9616 TEST(vmx_nm_test), 9617 TEST(vmx_db_test), 9618 TEST(vmx_nmi_window_test), 9619 TEST(vmx_intr_window_test), 9620 TEST(vmx_pending_event_test), 9621 TEST(vmx_pending_event_hlt_test), 9622 TEST(vmx_store_tsc_test), 9623 /* EPT access tests. */ 9624 TEST(ept_access_test_not_present), 9625 TEST(ept_access_test_read_only), 9626 TEST(ept_access_test_write_only), 9627 TEST(ept_access_test_read_write), 9628 TEST(ept_access_test_execute_only), 9629 TEST(ept_access_test_read_execute), 9630 TEST(ept_access_test_write_execute), 9631 TEST(ept_access_test_read_write_execute), 9632 TEST(ept_access_test_reserved_bits), 9633 TEST(ept_access_test_ignored_bits), 9634 TEST(ept_access_test_paddr_not_present_ad_disabled), 9635 TEST(ept_access_test_paddr_not_present_ad_enabled), 9636 TEST(ept_access_test_paddr_read_only_ad_disabled), 9637 TEST(ept_access_test_paddr_read_only_ad_enabled), 9638 TEST(ept_access_test_paddr_read_write), 9639 TEST(ept_access_test_paddr_read_write_execute), 9640 TEST(ept_access_test_paddr_read_execute_ad_disabled), 9641 TEST(ept_access_test_paddr_read_execute_ad_enabled), 9642 TEST(ept_access_test_paddr_not_present_page_fault), 9643 TEST(ept_access_test_force_2m_page), 9644 /* Atomic MSR switch tests. */ 9645 TEST(atomic_switch_max_msrs_test), 9646 TEST(atomic_switch_overflow_msrs_test), 9647 TEST(rdtsc_vmexit_diff_test), 9648 TEST(vmx_mtf_test), 9649 { NULL, NULL, NULL, NULL, NULL, {0} }, 9650 }; 9651