1 /* 2 * Framework for testing nested virtualization 3 */ 4 5 #include "svm.h" 6 #include "libcflat.h" 7 #include "processor.h" 8 #include "desc.h" 9 #include "msr.h" 10 #include "vm.h" 11 #include "smp.h" 12 #include "types.h" 13 #include "alloc_page.h" 14 #include "isr.h" 15 #include "apic.h" 16 #include "vmalloc.h" 17 18 /* for the nested page table*/ 19 u64 *pte[2048]; 20 u64 *pde[4]; 21 u64 *pdpe; 22 u64 *pml4e; 23 24 struct vmcb *vmcb; 25 26 u64 *npt_get_pte(u64 address) 27 { 28 int i1, i2; 29 30 address >>= 12; 31 i1 = (address >> 9) & 0x7ff; 32 i2 = address & 0x1ff; 33 34 return &pte[i1][i2]; 35 } 36 37 u64 *npt_get_pde(u64 address) 38 { 39 int i1, i2; 40 41 address >>= 21; 42 i1 = (address >> 9) & 0x3; 43 i2 = address & 0x1ff; 44 45 return &pde[i1][i2]; 46 } 47 48 u64 *npt_get_pdpe(void) 49 { 50 return pdpe; 51 } 52 53 u64 *npt_get_pml4e(void) 54 { 55 return pml4e; 56 } 57 58 bool smp_supported(void) 59 { 60 return cpu_count() > 1; 61 } 62 63 bool default_supported(void) 64 { 65 return true; 66 } 67 68 void default_prepare(struct svm_test *test) 69 { 70 vmcb_ident(vmcb); 71 } 72 73 void default_prepare_gif_clear(struct svm_test *test) 74 { 75 } 76 77 bool default_finished(struct svm_test *test) 78 { 79 return true; /* one vmexit */ 80 } 81 82 bool npt_supported(void) 83 { 84 return this_cpu_has(X86_FEATURE_NPT); 85 } 86 87 int get_test_stage(struct svm_test *test) 88 { 89 barrier(); 90 return test->scratch; 91 } 92 93 void set_test_stage(struct svm_test *test, int s) 94 { 95 barrier(); 96 test->scratch = s; 97 barrier(); 98 } 99 100 void inc_test_stage(struct svm_test *test) 101 { 102 barrier(); 103 test->scratch++; 104 barrier(); 105 } 106 107 static void vmcb_set_seg(struct vmcb_seg *seg, u16 selector, 108 u64 base, u32 limit, u32 attr) 109 { 110 seg->selector = selector; 111 seg->attrib = attr; 112 seg->limit = limit; 113 seg->base = base; 114 } 115 116 inline void vmmcall(void) 117 { 118 asm volatile ("vmmcall" : : : "memory"); 119 } 120 121 static test_guest_func guest_main; 122 123 void test_set_guest(test_guest_func func) 124 { 125 guest_main = func; 126 } 127 128 static void test_thunk(struct svm_test *test) 129 { 130 guest_main(test); 131 vmmcall(); 132 } 133 134 u8 *io_bitmap; 135 u8 io_bitmap_area[16384]; 136 137 u8 *msr_bitmap; 138 u8 msr_bitmap_area[MSR_BITMAP_SIZE + PAGE_SIZE]; 139 140 void vmcb_ident(struct vmcb *vmcb) 141 { 142 u64 vmcb_phys = virt_to_phys(vmcb); 143 struct vmcb_save_area *save = &vmcb->save; 144 struct vmcb_control_area *ctrl = &vmcb->control; 145 u32 data_seg_attr = 3 | SVM_SELECTOR_S_MASK | SVM_SELECTOR_P_MASK 146 | SVM_SELECTOR_DB_MASK | SVM_SELECTOR_G_MASK; 147 u32 code_seg_attr = 9 | SVM_SELECTOR_S_MASK | SVM_SELECTOR_P_MASK 148 | SVM_SELECTOR_L_MASK | SVM_SELECTOR_G_MASK; 149 struct descriptor_table_ptr desc_table_ptr; 150 151 memset(vmcb, 0, sizeof(*vmcb)); 152 asm volatile ("vmsave %0" : : "a"(vmcb_phys) : "memory"); 153 vmcb_set_seg(&save->es, read_es(), 0, -1U, data_seg_attr); 154 vmcb_set_seg(&save->cs, read_cs(), 0, -1U, code_seg_attr); 155 vmcb_set_seg(&save->ss, read_ss(), 0, -1U, data_seg_attr); 156 vmcb_set_seg(&save->ds, read_ds(), 0, -1U, data_seg_attr); 157 sgdt(&desc_table_ptr); 158 vmcb_set_seg(&save->gdtr, 0, desc_table_ptr.base, desc_table_ptr.limit, 0); 159 sidt(&desc_table_ptr); 160 vmcb_set_seg(&save->idtr, 0, desc_table_ptr.base, desc_table_ptr.limit, 0); 161 ctrl->asid = 1; 162 save->cpl = 0; 163 save->efer = rdmsr(MSR_EFER); 164 save->cr4 = read_cr4(); 165 save->cr3 = read_cr3(); 166 save->cr0 = read_cr0(); 167 save->dr7 = read_dr7(); 168 save->dr6 = read_dr6(); 169 save->cr2 = read_cr2(); 170 save->g_pat = rdmsr(MSR_IA32_CR_PAT); 171 save->dbgctl = rdmsr(MSR_IA32_DEBUGCTLMSR); 172 ctrl->intercept = (1ULL << INTERCEPT_VMRUN) | (1ULL << INTERCEPT_VMMCALL); 173 ctrl->iopm_base_pa = virt_to_phys(io_bitmap); 174 ctrl->msrpm_base_pa = virt_to_phys(msr_bitmap); 175 176 if (npt_supported()) { 177 ctrl->nested_ctl = 1; 178 ctrl->nested_cr3 = (u64)pml4e; 179 ctrl->tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID; 180 } 181 } 182 183 struct regs regs; 184 185 struct regs get_regs(void) 186 { 187 return regs; 188 } 189 190 // rax handled specially below 191 192 #define SAVE_GPR_C \ 193 "xchg %%rbx, regs+0x8\n\t" \ 194 "xchg %%rcx, regs+0x10\n\t" \ 195 "xchg %%rdx, regs+0x18\n\t" \ 196 "xchg %%rbp, regs+0x28\n\t" \ 197 "xchg %%rsi, regs+0x30\n\t" \ 198 "xchg %%rdi, regs+0x38\n\t" \ 199 "xchg %%r8, regs+0x40\n\t" \ 200 "xchg %%r9, regs+0x48\n\t" \ 201 "xchg %%r10, regs+0x50\n\t" \ 202 "xchg %%r11, regs+0x58\n\t" \ 203 "xchg %%r12, regs+0x60\n\t" \ 204 "xchg %%r13, regs+0x68\n\t" \ 205 "xchg %%r14, regs+0x70\n\t" \ 206 "xchg %%r15, regs+0x78\n\t" 207 208 #define LOAD_GPR_C SAVE_GPR_C 209 210 struct svm_test *v2_test; 211 212 #define ASM_PRE_VMRUN_CMD \ 213 "vmload %%rax\n\t" \ 214 "mov regs+0x80, %%r15\n\t" \ 215 "mov %%r15, 0x170(%%rax)\n\t" \ 216 "mov regs, %%r15\n\t" \ 217 "mov %%r15, 0x1f8(%%rax)\n\t" \ 218 LOAD_GPR_C \ 219 220 #define ASM_POST_VMRUN_CMD \ 221 SAVE_GPR_C \ 222 "mov 0x170(%%rax), %%r15\n\t" \ 223 "mov %%r15, regs+0x80\n\t" \ 224 "mov 0x1f8(%%rax), %%r15\n\t" \ 225 "mov %%r15, regs\n\t" \ 226 "vmsave %%rax\n\t" \ 227 228 u64 guest_stack[10000]; 229 230 int svm_vmrun(void) 231 { 232 vmcb->save.rip = (ulong)test_thunk; 233 vmcb->save.rsp = (ulong)(guest_stack + ARRAY_SIZE(guest_stack)); 234 regs.rdi = (ulong)v2_test; 235 236 asm volatile ( 237 ASM_PRE_VMRUN_CMD 238 "vmrun %%rax\n\t" \ 239 ASM_POST_VMRUN_CMD 240 : 241 : "a" (virt_to_phys(vmcb)) 242 : "memory", "r15"); 243 244 return (vmcb->control.exit_code); 245 } 246 247 extern u64 *vmrun_rip; 248 249 static void test_run(struct svm_test *test) 250 { 251 u64 vmcb_phys = virt_to_phys(vmcb); 252 253 irq_disable(); 254 vmcb_ident(vmcb); 255 256 test->prepare(test); 257 guest_main = test->guest_func; 258 vmcb->save.rip = (ulong)test_thunk; 259 vmcb->save.rsp = (ulong)(guest_stack + ARRAY_SIZE(guest_stack)); 260 regs.rdi = (ulong)test; 261 do { 262 struct svm_test *the_test = test; 263 u64 the_vmcb = vmcb_phys; 264 asm volatile ( 265 "clgi;\n\t" // semi-colon needed for LLVM compatibility 266 "sti \n\t" 267 "call *%c[PREPARE_GIF_CLEAR](%[test]) \n \t" 268 "mov %[vmcb_phys], %%rax \n\t" 269 ASM_PRE_VMRUN_CMD 270 ".global vmrun_rip\n\t" \ 271 "vmrun_rip: vmrun %%rax\n\t" \ 272 ASM_POST_VMRUN_CMD 273 "cli \n\t" 274 "stgi" 275 : // inputs clobbered by the guest: 276 "=D" (the_test), // first argument register 277 "=b" (the_vmcb) // callee save register! 278 : [test] "0" (the_test), 279 [vmcb_phys] "1"(the_vmcb), 280 [PREPARE_GIF_CLEAR] "i" (offsetof(struct svm_test, prepare_gif_clear)) 281 : "rax", "rcx", "rdx", "rsi", 282 "r8", "r9", "r10", "r11" , "r12", "r13", "r14", "r15", 283 "memory"); 284 ++test->exits; 285 } while (!test->finished(test)); 286 irq_enable(); 287 288 report(test->succeeded(test), "%s", test->name); 289 290 if (test->on_vcpu) 291 test->on_vcpu_done = true; 292 } 293 294 static void set_additional_vcpu_msr(void *msr_efer) 295 { 296 void *hsave = alloc_page(); 297 298 wrmsr(MSR_VM_HSAVE_PA, virt_to_phys(hsave)); 299 wrmsr(MSR_EFER, (ulong)msr_efer | EFER_SVME); 300 } 301 302 static void setup_svm(void) 303 { 304 void *hsave = alloc_page(); 305 u64 *page, address; 306 int i,j; 307 308 wrmsr(MSR_VM_HSAVE_PA, virt_to_phys(hsave)); 309 wrmsr(MSR_EFER, rdmsr(MSR_EFER) | EFER_SVME); 310 311 io_bitmap = (void *) ALIGN((ulong)io_bitmap_area, PAGE_SIZE); 312 313 msr_bitmap = (void *) ALIGN((ulong)msr_bitmap_area, PAGE_SIZE); 314 315 if (!npt_supported()) 316 return; 317 318 for (i = 1; i < cpu_count(); i++) 319 on_cpu(i, (void *)set_additional_vcpu_msr, (void *)rdmsr(MSR_EFER)); 320 321 printf("NPT detected - running all tests with NPT enabled\n"); 322 323 /* 324 * Nested paging supported - Build a nested page table 325 * Build the page-table bottom-up and map everything with 4k 326 * pages to get enough granularity for the NPT unit-tests. 327 */ 328 329 address = 0; 330 331 /* PTE level */ 332 for (i = 0; i < 2048; ++i) { 333 page = alloc_page(); 334 335 for (j = 0; j < 512; ++j, address += 4096) 336 page[j] = address | 0x067ULL; 337 338 pte[i] = page; 339 } 340 341 /* PDE level */ 342 for (i = 0; i < 4; ++i) { 343 page = alloc_page(); 344 345 for (j = 0; j < 512; ++j) 346 page[j] = (u64)pte[(i * 512) + j] | 0x027ULL; 347 348 pde[i] = page; 349 } 350 351 /* PDPe level */ 352 pdpe = alloc_page(); 353 for (i = 0; i < 4; ++i) 354 pdpe[i] = ((u64)(pde[i])) | 0x27; 355 356 /* PML4e level */ 357 pml4e = alloc_page(); 358 pml4e[0] = ((u64)pdpe) | 0x27; 359 } 360 361 int matched; 362 363 static bool 364 test_wanted(const char *name, char *filters[], int filter_count) 365 { 366 int i; 367 bool positive = false; 368 bool match = false; 369 char clean_name[strlen(name) + 1]; 370 char *c; 371 const char *n; 372 373 /* Replace spaces with underscores. */ 374 n = name; 375 c = &clean_name[0]; 376 do *c++ = (*n == ' ') ? '_' : *n; 377 while (*n++); 378 379 for (i = 0; i < filter_count; i++) { 380 const char *filter = filters[i]; 381 382 if (filter[0] == '-') { 383 if (simple_glob(clean_name, filter + 1)) 384 return false; 385 } else { 386 positive = true; 387 match |= simple_glob(clean_name, filter); 388 } 389 } 390 391 if (!positive || match) { 392 matched++; 393 return true; 394 } else { 395 return false; 396 } 397 } 398 399 int main(int ac, char **av) 400 { 401 /* Omit PT_USER_MASK to allow tested host.CR4.SMEP=1. */ 402 pteval_t opt_mask = 0; 403 int i = 0; 404 405 ac--; 406 av++; 407 408 __setup_vm(&opt_mask); 409 410 if (!this_cpu_has(X86_FEATURE_SVM)) { 411 printf("SVM not availble\n"); 412 return report_summary(); 413 } 414 415 setup_svm(); 416 417 vmcb = alloc_page(); 418 419 for (; svm_tests[i].name != NULL; i++) { 420 if (!test_wanted(svm_tests[i].name, av, ac)) 421 continue; 422 if (svm_tests[i].supported && !svm_tests[i].supported()) 423 continue; 424 if (svm_tests[i].v2 == NULL) { 425 if (svm_tests[i].on_vcpu) { 426 if (cpu_count() <= svm_tests[i].on_vcpu) 427 continue; 428 on_cpu_async(svm_tests[i].on_vcpu, (void *)test_run, &svm_tests[i]); 429 while (!svm_tests[i].on_vcpu_done) 430 cpu_relax(); 431 } 432 else 433 test_run(&svm_tests[i]); 434 } else { 435 vmcb_ident(vmcb); 436 v2_test = &(svm_tests[i]); 437 svm_tests[i].v2(); 438 } 439 } 440 441 if (!matched) 442 report(matched, "command line didn't match any tests!"); 443 444 return report_summary(); 445 } 446