1 #ifndef _X86_PROCESSOR_H_ 2 #define _X86_PROCESSOR_H_ 3 4 #include "libcflat.h" 5 #include "desc.h" 6 #include "msr.h" 7 #include <bitops.h> 8 #include <stdint.h> 9 #include <util.h> 10 11 #define CANONICAL_48_VAL 0xffffaaaaaaaaaaaaull 12 #define CANONICAL_57_VAL 0xffaaaaaaaaaaaaaaull 13 #define NONCANONICAL 0xaaaaaaaaaaaaaaaaull 14 15 #define LAM57_MASK GENMASK_ULL(62, 57) 16 #define LAM48_MASK GENMASK_ULL(62, 48) 17 18 /* 19 * Get a linear address by combining @addr with a non-canonical pattern in the 20 * @mask bits. 21 */ 22 static inline u64 get_non_canonical(u64 addr, u64 mask) 23 { 24 return (addr & ~mask) | (NONCANONICAL & mask); 25 } 26 27 #ifdef __x86_64__ 28 # define R "r" 29 # define W "q" 30 # define S "8" 31 #else 32 # define R "e" 33 # define W "l" 34 # define S "4" 35 #endif 36 37 #define DE_VECTOR 0 38 #define DB_VECTOR 1 39 #define NMI_VECTOR 2 40 #define BP_VECTOR 3 41 #define OF_VECTOR 4 42 #define BR_VECTOR 5 43 #define UD_VECTOR 6 44 #define NM_VECTOR 7 45 #define DF_VECTOR 8 46 #define TS_VECTOR 10 47 #define NP_VECTOR 11 48 #define SS_VECTOR 12 49 #define GP_VECTOR 13 50 #define PF_VECTOR 14 51 #define MF_VECTOR 16 52 #define AC_VECTOR 17 53 #define MC_VECTOR 18 54 #define XM_VECTOR 19 55 #define XF_VECTOR XM_VECTOR /* AMD */ 56 #define VE_VECTOR 20 /* Intel only */ 57 #define CP_VECTOR 21 58 #define HV_VECTOR 28 /* AMD only */ 59 #define VC_VECTOR 29 /* AMD only */ 60 #define SX_VECTOR 30 /* AMD only */ 61 62 #define X86_CR0_PE_BIT (0) 63 #define X86_CR0_PE BIT(X86_CR0_PE_BIT) 64 #define X86_CR0_MP_BIT (1) 65 #define X86_CR0_MP BIT(X86_CR0_MP_BIT) 66 #define X86_CR0_EM_BIT (2) 67 #define X86_CR0_EM BIT(X86_CR0_EM_BIT) 68 #define X86_CR0_TS_BIT (3) 69 #define X86_CR0_TS BIT(X86_CR0_TS_BIT) 70 #define X86_CR0_ET_BIT (4) 71 #define X86_CR0_ET BIT(X86_CR0_ET_BIT) 72 #define X86_CR0_NE_BIT (5) 73 #define X86_CR0_NE BIT(X86_CR0_NE_BIT) 74 #define X86_CR0_WP_BIT (16) 75 #define X86_CR0_WP BIT(X86_CR0_WP_BIT) 76 #define X86_CR0_AM_BIT (18) 77 #define X86_CR0_AM BIT(X86_CR0_AM_BIT) 78 #define X86_CR0_NW_BIT (29) 79 #define X86_CR0_NW BIT(X86_CR0_NW_BIT) 80 #define X86_CR0_CD_BIT (30) 81 #define X86_CR0_CD BIT(X86_CR0_CD_BIT) 82 #define X86_CR0_PG_BIT (31) 83 #define X86_CR0_PG BIT(X86_CR0_PG_BIT) 84 85 #define X86_CR3_PCID_MASK GENMASK(11, 0) 86 #define X86_CR3_LAM_U57_BIT (61) 87 #define X86_CR3_LAM_U57 BIT_ULL(X86_CR3_LAM_U57_BIT) 88 #define X86_CR3_LAM_U48_BIT (62) 89 #define X86_CR3_LAM_U48 BIT_ULL(X86_CR3_LAM_U48_BIT) 90 91 #define X86_CR4_VME_BIT (0) 92 #define X86_CR4_VME BIT(X86_CR4_VME_BIT) 93 #define X86_CR4_PVI_BIT (1) 94 #define X86_CR4_PVI BIT(X86_CR4_PVI_BIT) 95 #define X86_CR4_TSD_BIT (2) 96 #define X86_CR4_TSD BIT(X86_CR4_TSD_BIT) 97 #define X86_CR4_DE_BIT (3) 98 #define X86_CR4_DE BIT(X86_CR4_DE_BIT) 99 #define X86_CR4_PSE_BIT (4) 100 #define X86_CR4_PSE BIT(X86_CR4_PSE_BIT) 101 #define X86_CR4_PAE_BIT (5) 102 #define X86_CR4_PAE BIT(X86_CR4_PAE_BIT) 103 #define X86_CR4_MCE_BIT (6) 104 #define X86_CR4_MCE BIT(X86_CR4_MCE_BIT) 105 #define X86_CR4_PGE_BIT (7) 106 #define X86_CR4_PGE BIT(X86_CR4_PGE_BIT) 107 #define X86_CR4_PCE_BIT (8) 108 #define X86_CR4_PCE BIT(X86_CR4_PCE_BIT) 109 #define X86_CR4_OSFXSR_BIT (9) 110 #define X86_CR4_OSFXSR BIT(X86_CR4_OSFXSR_BIT) 111 #define X86_CR4_OSXMMEXCPT_BIT (10) 112 #define X86_CR4_OSXMMEXCPT BIT(X86_CR4_OSXMMEXCPT_BIT) 113 #define X86_CR4_UMIP_BIT (11) 114 #define X86_CR4_UMIP BIT(X86_CR4_UMIP_BIT) 115 #define X86_CR4_LA57_BIT (12) 116 #define X86_CR4_LA57 BIT(X86_CR4_LA57_BIT) 117 #define X86_CR4_VMXE_BIT (13) 118 #define X86_CR4_VMXE BIT(X86_CR4_VMXE_BIT) 119 #define X86_CR4_SMXE_BIT (14) 120 #define X86_CR4_SMXE BIT(X86_CR4_SMXE_BIT) 121 /* UNUSED (15) */ 122 #define X86_CR4_FSGSBASE_BIT (16) 123 #define X86_CR4_FSGSBASE BIT(X86_CR4_FSGSBASE_BIT) 124 #define X86_CR4_PCIDE_BIT (17) 125 #define X86_CR4_PCIDE BIT(X86_CR4_PCIDE_BIT) 126 #define X86_CR4_OSXSAVE_BIT (18) 127 #define X86_CR4_OSXSAVE BIT(X86_CR4_OSXSAVE_BIT) 128 #define X86_CR4_KL_BIT (19) 129 #define X86_CR4_KL BIT(X86_CR4_KL_BIT) 130 #define X86_CR4_SMEP_BIT (20) 131 #define X86_CR4_SMEP BIT(X86_CR4_SMEP_BIT) 132 #define X86_CR4_SMAP_BIT (21) 133 #define X86_CR4_SMAP BIT(X86_CR4_SMAP_BIT) 134 #define X86_CR4_PKE_BIT (22) 135 #define X86_CR4_PKE BIT(X86_CR4_PKE_BIT) 136 #define X86_CR4_CET_BIT (23) 137 #define X86_CR4_CET BIT(X86_CR4_CET_BIT) 138 #define X86_CR4_PKS_BIT (24) 139 #define X86_CR4_PKS BIT(X86_CR4_PKS_BIT) 140 #define X86_CR4_LAM_SUP_BIT (28) 141 #define X86_CR4_LAM_SUP BIT(X86_CR4_LAM_SUP_BIT) 142 143 #define X86_EFLAGS_CF_BIT (0) 144 #define X86_EFLAGS_CF BIT(X86_EFLAGS_CF_BIT) 145 #define X86_EFLAGS_FIXED_BIT (1) 146 #define X86_EFLAGS_FIXED BIT(X86_EFLAGS_FIXED_BIT) 147 #define X86_EFLAGS_PF_BIT (2) 148 #define X86_EFLAGS_PF BIT(X86_EFLAGS_PF_BIT) 149 /* RESERVED 0 (3) */ 150 #define X86_EFLAGS_AF_BIT (4) 151 #define X86_EFLAGS_AF BIT(X86_EFLAGS_AF_BIT) 152 /* RESERVED 0 (5) */ 153 #define X86_EFLAGS_ZF_BIT (6) 154 #define X86_EFLAGS_ZF BIT(X86_EFLAGS_ZF_BIT) 155 #define X86_EFLAGS_SF_BIT (7) 156 #define X86_EFLAGS_SF BIT(X86_EFLAGS_SF_BIT) 157 #define X86_EFLAGS_TF_BIT (8) 158 #define X86_EFLAGS_TF BIT(X86_EFLAGS_TF_BIT) 159 #define X86_EFLAGS_IF_BIT (9) 160 #define X86_EFLAGS_IF BIT(X86_EFLAGS_IF_BIT) 161 #define X86_EFLAGS_DF_BIT (10) 162 #define X86_EFLAGS_DF BIT(X86_EFLAGS_DF_BIT) 163 #define X86_EFLAGS_OF_BIT (11) 164 #define X86_EFLAGS_OF BIT(X86_EFLAGS_OF_BIT) 165 #define X86_EFLAGS_IOPL GENMASK(13, 12) 166 #define X86_EFLAGS_NT_BIT (14) 167 #define X86_EFLAGS_NT BIT(X86_EFLAGS_NT_BIT) 168 /* RESERVED 0 (15) */ 169 #define X86_EFLAGS_RF_BIT (16) 170 #define X86_EFLAGS_RF BIT(X86_EFLAGS_RF_BIT) 171 #define X86_EFLAGS_VM_BIT (17) 172 #define X86_EFLAGS_VM BIT(X86_EFLAGS_VM_BIT) 173 #define X86_EFLAGS_AC_BIT (18) 174 #define X86_EFLAGS_AC BIT(X86_EFLAGS_AC_BIT) 175 #define X86_EFLAGS_VIF_BIT (19) 176 #define X86_EFLAGS_VIF BIT(X86_EFLAGS_VIF_BIT) 177 #define X86_EFLAGS_VIP_BIT (20) 178 #define X86_EFLAGS_VIP BIT(X86_EFLAGS_VIP_BIT) 179 #define X86_EFLAGS_ID_BIT (21) 180 #define X86_EFLAGS_ID BIT(X86_EFLAGS_ID_BIT) 181 182 #define X86_EFLAGS_ALU (X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF | \ 183 X86_EFLAGS_ZF | X86_EFLAGS_SF | X86_EFLAGS_OF) 184 185 186 /* 187 * CPU features 188 */ 189 190 enum cpuid_output_regs { 191 EAX, 192 EBX, 193 ECX, 194 EDX 195 }; 196 197 struct cpuid { u32 a, b, c, d; }; 198 199 static inline struct cpuid raw_cpuid(u32 function, u32 index) 200 { 201 struct cpuid r; 202 asm volatile ("cpuid" 203 : "=a"(r.a), "=b"(r.b), "=c"(r.c), "=d"(r.d) 204 : "0"(function), "2"(index)); 205 return r; 206 } 207 208 static inline struct cpuid cpuid_indexed(u32 function, u32 index) 209 { 210 u32 level = raw_cpuid(function & 0xf0000000, 0).a; 211 if (level < function) 212 return (struct cpuid) { 0, 0, 0, 0 }; 213 return raw_cpuid(function, index); 214 } 215 216 static inline struct cpuid cpuid(u32 function) 217 { 218 return cpuid_indexed(function, 0); 219 } 220 221 static inline bool is_intel(void) 222 { 223 struct cpuid c = cpuid(0); 224 u32 name[4] = {c.b, c.d, c.c }; 225 226 return strcmp((char *)name, "GenuineIntel") == 0; 227 } 228 229 /* 230 * Pack the information into a 64-bit value so that each X86_FEATURE_XXX can be 231 * passed by value with no overhead. 232 */ 233 struct x86_cpu_feature { 234 u32 function; 235 u16 index; 236 u8 reg; 237 u8 bit; 238 }; 239 240 #define X86_CPU_FEATURE(fn, idx, gpr, __bit) \ 241 ({ \ 242 struct x86_cpu_feature feature = { \ 243 .function = fn, \ 244 .index = idx, \ 245 .reg = gpr, \ 246 .bit = __bit, \ 247 }; \ 248 \ 249 static_assert((fn & 0xc0000000) == 0 || \ 250 (fn & 0xc0000000) == 0x40000000 || \ 251 (fn & 0xc0000000) == 0x80000000 || \ 252 (fn & 0xc0000000) == 0xc0000000); \ 253 static_assert(idx < BIT(sizeof(feature.index) * BITS_PER_BYTE)); \ 254 feature; \ 255 }) 256 257 /* 258 * Basic Leafs, a.k.a. Intel defined 259 */ 260 #define X86_FEATURE_MWAIT X86_CPU_FEATURE(0x1, 0, ECX, 3) 261 #define X86_FEATURE_VMX X86_CPU_FEATURE(0x1, 0, ECX, 5) 262 #define X86_FEATURE_PDCM X86_CPU_FEATURE(0x1, 0, ECX, 15) 263 #define X86_FEATURE_PCID X86_CPU_FEATURE(0x1, 0, ECX, 17) 264 #define X86_FEATURE_X2APIC X86_CPU_FEATURE(0x1, 0, ECX, 21) 265 #define X86_FEATURE_MOVBE X86_CPU_FEATURE(0x1, 0, ECX, 22) 266 #define X86_FEATURE_TSC_DEADLINE_TIMER X86_CPU_FEATURE(0x1, 0, ECX, 24) 267 #define X86_FEATURE_XSAVE X86_CPU_FEATURE(0x1, 0, ECX, 26) 268 #define X86_FEATURE_OSXSAVE X86_CPU_FEATURE(0x1, 0, ECX, 27) 269 #define X86_FEATURE_RDRAND X86_CPU_FEATURE(0x1, 0, ECX, 30) 270 #define X86_FEATURE_MCE X86_CPU_FEATURE(0x1, 0, EDX, 7) 271 #define X86_FEATURE_APIC X86_CPU_FEATURE(0x1, 0, EDX, 9) 272 #define X86_FEATURE_CLFLUSH X86_CPU_FEATURE(0x1, 0, EDX, 19) 273 #define X86_FEATURE_DS X86_CPU_FEATURE(0x1, 0, EDX, 21) 274 #define X86_FEATURE_XMM X86_CPU_FEATURE(0x1, 0, EDX, 25) 275 #define X86_FEATURE_XMM2 X86_CPU_FEATURE(0x1, 0, EDX, 26) 276 #define X86_FEATURE_TSC_ADJUST X86_CPU_FEATURE(0x7, 0, EBX, 1) 277 #define X86_FEATURE_HLE X86_CPU_FEATURE(0x7, 0, EBX, 4) 278 #define X86_FEATURE_SMEP X86_CPU_FEATURE(0x7, 0, EBX, 7) 279 #define X86_FEATURE_INVPCID X86_CPU_FEATURE(0x7, 0, EBX, 10) 280 #define X86_FEATURE_RTM X86_CPU_FEATURE(0x7, 0, EBX, 11) 281 #define X86_FEATURE_SMAP X86_CPU_FEATURE(0x7, 0, EBX, 20) 282 #define X86_FEATURE_PCOMMIT X86_CPU_FEATURE(0x7, 0, EBX, 22) 283 #define X86_FEATURE_CLFLUSHOPT X86_CPU_FEATURE(0x7, 0, EBX, 23) 284 #define X86_FEATURE_CLWB X86_CPU_FEATURE(0x7, 0, EBX, 24) 285 #define X86_FEATURE_INTEL_PT X86_CPU_FEATURE(0x7, 0, EBX, 25) 286 #define X86_FEATURE_UMIP X86_CPU_FEATURE(0x7, 0, ECX, 2) 287 #define X86_FEATURE_PKU X86_CPU_FEATURE(0x7, 0, ECX, 3) 288 #define X86_FEATURE_LA57 X86_CPU_FEATURE(0x7, 0, ECX, 16) 289 #define X86_FEATURE_RDPID X86_CPU_FEATURE(0x7, 0, ECX, 22) 290 #define X86_FEATURE_SHSTK X86_CPU_FEATURE(0x7, 0, ECX, 7) 291 #define X86_FEATURE_IBT X86_CPU_FEATURE(0x7, 0, EDX, 20) 292 #define X86_FEATURE_SPEC_CTRL X86_CPU_FEATURE(0x7, 0, EDX, 26) 293 #define X86_FEATURE_FLUSH_L1D X86_CPU_FEATURE(0x7, 0, EDX, 28) 294 #define X86_FEATURE_ARCH_CAPABILITIES X86_CPU_FEATURE(0x7, 0, EDX, 29) 295 #define X86_FEATURE_PKS X86_CPU_FEATURE(0x7, 0, ECX, 31) 296 #define X86_FEATURE_LAM X86_CPU_FEATURE(0x7, 1, EAX, 26) 297 298 /* 299 * KVM defined leafs 300 */ 301 #define KVM_FEATURE_ASYNC_PF X86_CPU_FEATURE(0x40000001, 0, EAX, 4) 302 #define KVM_FEATURE_ASYNC_PF_INT X86_CPU_FEATURE(0x40000001, 0, EAX, 14) 303 304 /* 305 * Extended Leafs, a.k.a. AMD defined 306 */ 307 #define X86_FEATURE_SVM X86_CPU_FEATURE(0x80000001, 0, ECX, 2) 308 #define X86_FEATURE_PERFCTR_CORE X86_CPU_FEATURE(0x80000001, 0, ECX, 23) 309 #define X86_FEATURE_NX X86_CPU_FEATURE(0x80000001, 0, EDX, 20) 310 #define X86_FEATURE_GBPAGES X86_CPU_FEATURE(0x80000001, 0, EDX, 26) 311 #define X86_FEATURE_RDTSCP X86_CPU_FEATURE(0x80000001, 0, EDX, 27) 312 #define X86_FEATURE_LM X86_CPU_FEATURE(0x80000001, 0, EDX, 29) 313 #define X86_FEATURE_RDPRU X86_CPU_FEATURE(0x80000008, 0, EBX, 4) 314 #define X86_FEATURE_AMD_IBPB X86_CPU_FEATURE(0x80000008, 0, EBX, 12) 315 #define X86_FEATURE_NPT X86_CPU_FEATURE(0x8000000A, 0, EDX, 0) 316 #define X86_FEATURE_LBRV X86_CPU_FEATURE(0x8000000A, 0, EDX, 1) 317 #define X86_FEATURE_NRIPS X86_CPU_FEATURE(0x8000000A, 0, EDX, 3) 318 #define X86_FEATURE_TSCRATEMSR X86_CPU_FEATURE(0x8000000A, 0, EDX, 4) 319 #define X86_FEATURE_PAUSEFILTER X86_CPU_FEATURE(0x8000000A, 0, EDX, 10) 320 #define X86_FEATURE_PFTHRESHOLD X86_CPU_FEATURE(0x8000000A, 0, EDX, 12) 321 #define X86_FEATURE_VGIF X86_CPU_FEATURE(0x8000000A, 0, EDX, 16) 322 #define X86_FEATURE_VNMI X86_CPU_FEATURE(0x8000000A, 0, EDX, 25) 323 #define X86_FEATURE_AMD_PMU_V2 X86_CPU_FEATURE(0x80000022, 0, EAX, 0) 324 325 /* 326 * Same idea as X86_FEATURE_XXX, but X86_PROPERTY_XXX retrieves a multi-bit 327 * value/property as opposed to a single-bit feature. Again, pack the info 328 * into a 64-bit value to pass by value with no overhead on 64-bit builds. 329 */ 330 struct x86_cpu_property { 331 u32 function; 332 u8 index; 333 u8 reg; 334 u8 lo_bit; 335 u8 hi_bit; 336 }; 337 #define X86_CPU_PROPERTY(fn, idx, gpr, low_bit, high_bit) \ 338 ({ \ 339 struct x86_cpu_property property = { \ 340 .function = fn, \ 341 .index = idx, \ 342 .reg = gpr, \ 343 .lo_bit = low_bit, \ 344 .hi_bit = high_bit, \ 345 }; \ 346 \ 347 static_assert(low_bit < high_bit); \ 348 static_assert((fn & 0xc0000000) == 0 || \ 349 (fn & 0xc0000000) == 0x40000000 || \ 350 (fn & 0xc0000000) == 0x80000000 || \ 351 (fn & 0xc0000000) == 0xc0000000); \ 352 static_assert(idx < BIT(sizeof(property.index) * BITS_PER_BYTE)); \ 353 property; \ 354 }) 355 356 #define X86_PROPERTY_MAX_BASIC_LEAF X86_CPU_PROPERTY(0, 0, EAX, 0, 31) 357 #define X86_PROPERTY_PMU_VERSION X86_CPU_PROPERTY(0xa, 0, EAX, 0, 7) 358 #define X86_PROPERTY_PMU_NR_GP_COUNTERS X86_CPU_PROPERTY(0xa, 0, EAX, 8, 15) 359 #define X86_PROPERTY_PMU_GP_COUNTERS_BIT_WIDTH X86_CPU_PROPERTY(0xa, 0, EAX, 16, 23) 360 #define X86_PROPERTY_PMU_EBX_BIT_VECTOR_LENGTH X86_CPU_PROPERTY(0xa, 0, EAX, 24, 31) 361 #define X86_PROPERTY_PMU_EVENTS_MASK X86_CPU_PROPERTY(0xa, 0, EBX, 0, 7) 362 #define X86_PROPERTY_PMU_FIXED_COUNTERS_BITMASK X86_CPU_PROPERTY(0xa, 0, ECX, 0, 31) 363 #define X86_PROPERTY_PMU_NR_FIXED_COUNTERS X86_CPU_PROPERTY(0xa, 0, EDX, 0, 4) 364 #define X86_PROPERTY_PMU_FIXED_COUNTERS_BIT_WIDTH X86_CPU_PROPERTY(0xa, 0, EDX, 5, 12) 365 366 #define X86_PROPERTY_SUPPORTED_XCR0_LO X86_CPU_PROPERTY(0xd, 0, EAX, 0, 31) 367 #define X86_PROPERTY_XSTATE_MAX_SIZE_XCR0 X86_CPU_PROPERTY(0xd, 0, EBX, 0, 31) 368 #define X86_PROPERTY_XSTATE_MAX_SIZE X86_CPU_PROPERTY(0xd, 0, ECX, 0, 31) 369 #define X86_PROPERTY_SUPPORTED_XCR0_HI X86_CPU_PROPERTY(0xd, 0, EDX, 0, 31) 370 371 #define X86_PROPERTY_XSTATE_TILE_SIZE X86_CPU_PROPERTY(0xd, 18, EAX, 0, 31) 372 #define X86_PROPERTY_XSTATE_TILE_OFFSET X86_CPU_PROPERTY(0xd, 18, EBX, 0, 31) 373 #define X86_PROPERTY_AMX_MAX_PALETTE_TABLES X86_CPU_PROPERTY(0x1d, 0, EAX, 0, 31) 374 #define X86_PROPERTY_AMX_TOTAL_TILE_BYTES X86_CPU_PROPERTY(0x1d, 1, EAX, 0, 15) 375 #define X86_PROPERTY_AMX_BYTES_PER_TILE X86_CPU_PROPERTY(0x1d, 1, EAX, 16, 31) 376 #define X86_PROPERTY_AMX_BYTES_PER_ROW X86_CPU_PROPERTY(0x1d, 1, EBX, 0, 15) 377 #define X86_PROPERTY_AMX_NR_TILE_REGS X86_CPU_PROPERTY(0x1d, 1, EBX, 16, 31) 378 #define X86_PROPERTY_AMX_MAX_ROWS X86_CPU_PROPERTY(0x1d, 1, ECX, 0, 15) 379 380 #define X86_PROPERTY_MAX_KVM_LEAF X86_CPU_PROPERTY(0x40000000, 0, EAX, 0, 31) 381 382 #define X86_PROPERTY_MAX_EXT_LEAF X86_CPU_PROPERTY(0x80000000, 0, EAX, 0, 31) 383 #define X86_PROPERTY_MAX_PHY_ADDR X86_CPU_PROPERTY(0x80000008, 0, EAX, 0, 7) 384 #define X86_PROPERTY_MAX_VIRT_ADDR X86_CPU_PROPERTY(0x80000008, 0, EAX, 8, 15) 385 #define X86_PROPERTY_GUEST_MAX_PHY_ADDR X86_CPU_PROPERTY(0x80000008, 0, EAX, 16, 23) 386 #define X86_PROPERTY_SEV_C_BIT X86_CPU_PROPERTY(0x8000001F, 0, EBX, 0, 5) 387 #define X86_PROPERTY_PHYS_ADDR_REDUCTION X86_CPU_PROPERTY(0x8000001F, 0, EBX, 6, 11) 388 #define X86_PROPERTY_NR_PERFCTR_CORE X86_CPU_PROPERTY(0x80000022, 0, EBX, 0, 3) 389 #define X86_PROPERTY_NR_PERFCTR_NB X86_CPU_PROPERTY(0x80000022, 0, EBX, 10, 15) 390 391 #define X86_PROPERTY_MAX_CENTAUR_LEAF X86_CPU_PROPERTY(0xC0000000, 0, EAX, 0, 31) 392 393 static inline u32 __this_cpu_has(u32 function, u32 index, u8 reg, u8 lo, u8 hi) 394 { 395 union { 396 struct cpuid cpuid; 397 u32 gprs[4]; 398 } c; 399 400 c.cpuid = cpuid_indexed(function, index); 401 402 return (c.gprs[reg] & GENMASK(hi, lo)) >> lo; 403 } 404 405 static inline bool this_cpu_has(struct x86_cpu_feature feature) 406 { 407 return __this_cpu_has(feature.function, feature.index, 408 feature.reg, feature.bit, feature.bit); 409 } 410 411 static inline uint32_t this_cpu_property(struct x86_cpu_property property) 412 { 413 return __this_cpu_has(property.function, property.index, 414 property.reg, property.lo_bit, property.hi_bit); 415 } 416 417 static __always_inline bool this_cpu_has_p(struct x86_cpu_property property) 418 { 419 uint32_t max_leaf; 420 421 switch (property.function & 0xc0000000) { 422 case 0: 423 max_leaf = this_cpu_property(X86_PROPERTY_MAX_BASIC_LEAF); 424 break; 425 case 0x40000000: 426 max_leaf = this_cpu_property(X86_PROPERTY_MAX_KVM_LEAF); 427 break; 428 case 0x80000000: 429 max_leaf = this_cpu_property(X86_PROPERTY_MAX_EXT_LEAF); 430 break; 431 case 0xc0000000: 432 max_leaf = this_cpu_property(X86_PROPERTY_MAX_CENTAUR_LEAF); 433 } 434 return max_leaf >= property.function; 435 } 436 437 static inline u8 cpuid_maxphyaddr(void) 438 { 439 if (!this_cpu_has_p(X86_PROPERTY_MAX_PHY_ADDR)) 440 return 36; 441 442 return this_cpu_property(X86_PROPERTY_MAX_PHY_ADDR); 443 } 444 445 static inline u64 this_cpu_supported_xcr0(void) 446 { 447 if (!this_cpu_has_p(X86_PROPERTY_SUPPORTED_XCR0_LO)) 448 return 0; 449 450 return (u64)this_cpu_property(X86_PROPERTY_SUPPORTED_XCR0_LO) | 451 ((u64)this_cpu_property(X86_PROPERTY_SUPPORTED_XCR0_HI) << 32); 452 } 453 454 struct far_pointer32 { 455 u32 offset; 456 u16 selector; 457 } __attribute__((packed)); 458 459 struct descriptor_table_ptr { 460 u16 limit; 461 ulong base; 462 } __attribute__((packed)); 463 464 static inline void clac(void) 465 { 466 asm volatile (".byte 0x0f, 0x01, 0xca" : : : "memory"); 467 } 468 469 static inline void stac(void) 470 { 471 asm volatile (".byte 0x0f, 0x01, 0xcb" : : : "memory"); 472 } 473 474 static inline u16 read_cs(void) 475 { 476 unsigned val; 477 478 asm volatile ("mov %%cs, %0" : "=mr"(val)); 479 return val; 480 } 481 482 static inline u16 read_ds(void) 483 { 484 unsigned val; 485 486 asm volatile ("mov %%ds, %0" : "=mr"(val)); 487 return val; 488 } 489 490 static inline u16 read_es(void) 491 { 492 unsigned val; 493 494 asm volatile ("mov %%es, %0" : "=mr"(val)); 495 return val; 496 } 497 498 static inline u16 read_ss(void) 499 { 500 unsigned val; 501 502 asm volatile ("mov %%ss, %0" : "=mr"(val)); 503 return val; 504 } 505 506 static inline u16 read_fs(void) 507 { 508 unsigned val; 509 510 asm volatile ("mov %%fs, %0" : "=mr"(val)); 511 return val; 512 } 513 514 static inline u16 read_gs(void) 515 { 516 unsigned val; 517 518 asm volatile ("mov %%gs, %0" : "=mr"(val)); 519 return val; 520 } 521 522 static inline unsigned long read_rflags(void) 523 { 524 unsigned long f; 525 asm volatile ("pushf; pop %0\n\t" : "=rm"(f)); 526 return f; 527 } 528 529 static inline void write_ds(unsigned val) 530 { 531 asm volatile ("mov %0, %%ds" : : "rm"(val) : "memory"); 532 } 533 534 static inline void write_es(unsigned val) 535 { 536 asm volatile ("mov %0, %%es" : : "rm"(val) : "memory"); 537 } 538 539 static inline void write_ss(unsigned val) 540 { 541 asm volatile ("mov %0, %%ss" : : "rm"(val) : "memory"); 542 } 543 544 static inline void write_fs(unsigned val) 545 { 546 asm volatile ("mov %0, %%fs" : : "rm"(val) : "memory"); 547 } 548 549 static inline void write_gs(unsigned val) 550 { 551 asm volatile ("mov %0, %%gs" : : "rm"(val) : "memory"); 552 } 553 554 static inline void write_rflags(unsigned long f) 555 { 556 asm volatile ("push %0; popf\n\t" : : "rm"(f)); 557 } 558 559 static inline void set_iopl(int iopl) 560 { 561 unsigned long flags = read_rflags() & ~X86_EFLAGS_IOPL; 562 flags |= iopl * (X86_EFLAGS_IOPL / 3); 563 write_rflags(flags); 564 } 565 566 /* 567 * Don't use the safe variants for rdmsr() or wrmsr(). The exception fixup 568 * infrastructure uses per-CPU data and thus consumes GS.base. Various tests 569 * temporarily modify MSR_GS_BASE and will explode when trying to determine 570 * whether or not RDMSR/WRMSR faulted. 571 */ 572 static inline u64 rdmsr(u32 index) 573 { 574 u32 a, d; 575 asm volatile ("rdmsr" : "=a"(a), "=d"(d) : "c"(index) : "memory"); 576 return a | ((u64)d << 32); 577 } 578 579 static inline void wrmsr(u32 index, u64 val) 580 { 581 u32 a = val, d = val >> 32; 582 asm volatile ("wrmsr" : : "a"(a), "d"(d), "c"(index) : "memory"); 583 } 584 585 #define __rdreg64_safe(fep, insn, index, val) \ 586 ({ \ 587 uint32_t a, d; \ 588 int vector; \ 589 \ 590 vector = __asm_safe_out2(fep, insn, "=a"(a), "=d"(d), "c"(index));\ 591 \ 592 if (vector) \ 593 *(val) = 0; \ 594 else \ 595 *(val) = (uint64_t)a | ((uint64_t)d << 32); \ 596 vector; \ 597 }) 598 599 #define rdreg64_safe(insn, index, val) \ 600 __rdreg64_safe("", insn, index, val) 601 602 #define __wrreg64_safe(fep, insn, index, val) \ 603 ({ \ 604 uint32_t eax = (val), edx = (val) >> 32; \ 605 \ 606 __asm_safe(fep, insn, "a" (eax), "d" (edx), "c" (index)); \ 607 }) 608 609 #define wrreg64_safe(insn, index, val) \ 610 __wrreg64_safe("", insn, index, val) 611 612 static inline int rdmsr_safe(u32 index, uint64_t *val) 613 { 614 return rdreg64_safe("rdmsr", index, val); 615 } 616 617 static inline int rdmsr_fep_safe(u32 index, uint64_t *val) 618 { 619 return __rdreg64_safe(KVM_FEP, "rdmsr", index, val); 620 } 621 622 static inline int wrmsr_safe(u32 index, u64 val) 623 { 624 return wrreg64_safe("wrmsr", index, val); 625 } 626 627 static inline int wrmsr_fep_safe(u32 index, u64 val) 628 { 629 return __wrreg64_safe(KVM_FEP, "wrmsr", index, val); 630 } 631 632 static inline int rdpmc_safe(u32 index, uint64_t *val) 633 { 634 return rdreg64_safe("rdpmc", index, val); 635 } 636 637 static inline uint64_t rdpmc(uint32_t index) 638 { 639 uint64_t val; 640 int vector = rdpmc_safe(index, &val); 641 642 assert_msg(!vector, "Unexpected %s on RDPMC(%" PRId32 ")", 643 exception_mnemonic(vector), index); 644 return val; 645 } 646 647 static inline int xgetbv_safe(u32 index, u64 *result) 648 { 649 return rdreg64_safe(".byte 0x0f,0x01,0xd0", index, result); 650 } 651 652 static inline int xsetbv_safe(u32 index, u64 value) 653 { 654 return wrreg64_safe(".byte 0x0f,0x01,0xd1", index, value); 655 } 656 657 static inline int write_cr0_safe(ulong val) 658 { 659 return asm_safe("mov %0,%%cr0", "r" (val)); 660 } 661 662 static inline void write_cr0(ulong val) 663 { 664 int vector = write_cr0_safe(val); 665 666 assert_msg(!vector, "Unexpected fault '%d' writing CR0 = %lx", 667 vector, val); 668 } 669 670 static inline ulong read_cr0(void) 671 { 672 ulong val; 673 asm volatile ("mov %%cr0, %0" : "=r"(val) : : "memory"); 674 return val; 675 } 676 677 static inline void write_cr2(ulong val) 678 { 679 asm volatile ("mov %0, %%cr2" : : "r"(val) : "memory"); 680 } 681 682 static inline ulong read_cr2(void) 683 { 684 ulong val; 685 asm volatile ("mov %%cr2, %0" : "=r"(val) : : "memory"); 686 return val; 687 } 688 689 static inline int write_cr3_safe(ulong val) 690 { 691 return asm_safe("mov %0,%%cr3", "r" (val)); 692 } 693 694 static inline void write_cr3(ulong val) 695 { 696 int vector = write_cr3_safe(val); 697 698 assert_msg(!vector, "Unexpected fault '%d' writing CR3 = %lx", 699 vector, val); 700 } 701 702 static inline ulong read_cr3(void) 703 { 704 ulong val; 705 asm volatile ("mov %%cr3, %0" : "=r"(val) : : "memory"); 706 return val; 707 } 708 709 static inline void update_cr3(void *cr3) 710 { 711 write_cr3((ulong)cr3); 712 } 713 714 static inline int write_cr4_safe(ulong val) 715 { 716 return asm_safe("mov %0,%%cr4", "r" (val)); 717 } 718 719 static inline void write_cr4(ulong val) 720 { 721 int vector = write_cr4_safe(val); 722 723 assert_msg(!vector, "Unexpected fault '%d' writing CR4 = %lx", 724 vector, val); 725 } 726 727 static inline ulong read_cr4(void) 728 { 729 ulong val; 730 asm volatile ("mov %%cr4, %0" : "=r"(val) : : "memory"); 731 return val; 732 } 733 734 static inline void write_cr8(ulong val) 735 { 736 asm volatile ("mov %0, %%cr8" : : "r"(val) : "memory"); 737 } 738 739 static inline ulong read_cr8(void) 740 { 741 ulong val; 742 asm volatile ("mov %%cr8, %0" : "=r"(val) : : "memory"); 743 return val; 744 } 745 746 static inline void lgdt(const struct descriptor_table_ptr *ptr) 747 { 748 asm volatile ("lgdt %0" : : "m"(*ptr)); 749 } 750 751 static inline int lgdt_safe(const struct descriptor_table_ptr *ptr) 752 { 753 return asm_safe("lgdt %0", "m"(*ptr)); 754 } 755 756 static inline int lgdt_fep_safe(const struct descriptor_table_ptr *ptr) 757 { 758 return asm_fep_safe("lgdt %0", "m"(*ptr)); 759 } 760 761 static inline void sgdt(struct descriptor_table_ptr *ptr) 762 { 763 asm volatile ("sgdt %0" : "=m"(*ptr)); 764 } 765 766 static inline void lidt(const struct descriptor_table_ptr *ptr) 767 { 768 asm volatile ("lidt %0" : : "m"(*ptr)); 769 } 770 771 static inline int lidt_safe(const struct descriptor_table_ptr *ptr) 772 { 773 return asm_safe("lidt %0", "m"(*ptr)); 774 } 775 776 static inline int lidt_fep_safe(const struct descriptor_table_ptr *ptr) 777 { 778 return asm_fep_safe("lidt %0", "m"(*ptr)); 779 } 780 781 static inline void sidt(struct descriptor_table_ptr *ptr) 782 { 783 asm volatile ("sidt %0" : "=m"(*ptr)); 784 } 785 786 static inline void lldt(u16 val) 787 { 788 asm volatile ("lldt %0" : : "rm"(val)); 789 } 790 791 static inline int lldt_safe(u16 val) 792 { 793 return asm_safe("lldt %0", "rm"(val)); 794 } 795 796 static inline int lldt_fep_safe(u16 val) 797 { 798 return asm_safe("lldt %0", "rm"(val)); 799 } 800 801 static inline u16 sldt(void) 802 { 803 u16 val; 804 asm volatile ("sldt %0" : "=rm"(val)); 805 return val; 806 } 807 808 static inline void ltr(u16 val) 809 { 810 asm volatile ("ltr %0" : : "rm"(val)); 811 } 812 813 static inline int ltr_safe(u16 val) 814 { 815 return asm_safe("ltr %0", "rm"(val)); 816 } 817 818 static inline int ltr_fep_safe(u16 val) 819 { 820 return asm_safe("ltr %0", "rm"(val)); 821 } 822 823 static inline u16 str(void) 824 { 825 u16 val; 826 asm volatile ("str %0" : "=rm"(val)); 827 return val; 828 } 829 830 static inline void write_dr0(void *val) 831 { 832 asm volatile ("mov %0, %%dr0" : : "r"(val) : "memory"); 833 } 834 835 static inline void write_dr1(void *val) 836 { 837 asm volatile ("mov %0, %%dr1" : : "r"(val) : "memory"); 838 } 839 840 static inline void write_dr2(void *val) 841 { 842 asm volatile ("mov %0, %%dr2" : : "r"(val) : "memory"); 843 } 844 845 static inline void write_dr3(void *val) 846 { 847 asm volatile ("mov %0, %%dr3" : : "r"(val) : "memory"); 848 } 849 850 static inline void write_dr6(ulong val) 851 { 852 asm volatile ("mov %0, %%dr6" : : "r"(val) : "memory"); 853 } 854 855 static inline ulong read_dr6(void) 856 { 857 ulong val; 858 asm volatile ("mov %%dr6, %0" : "=r"(val)); 859 return val; 860 } 861 862 static inline void write_dr7(ulong val) 863 { 864 asm volatile ("mov %0, %%dr7" : : "r"(val) : "memory"); 865 } 866 867 static inline ulong read_dr7(void) 868 { 869 ulong val; 870 asm volatile ("mov %%dr7, %0" : "=r"(val)); 871 return val; 872 } 873 874 static inline void pause(void) 875 { 876 asm volatile ("pause"); 877 } 878 879 static inline void cli(void) 880 { 881 asm volatile ("cli"); 882 } 883 884 /* 885 * See also safe_halt(). 886 */ 887 static inline void sti(void) 888 { 889 asm volatile ("sti"); 890 } 891 892 /* 893 * Enable interrupts and ensure that interrupts are evaluated upon return from 894 * this function, i.e. execute a nop to consume the STi interrupt shadow. 895 */ 896 static inline void sti_nop(void) 897 { 898 asm volatile ("sti; nop"); 899 } 900 901 /* 902 * Enable interrupts for one instruction (nop), to allow the CPU to process all 903 * interrupts that are already pending. 904 */ 905 static inline void sti_nop_cli(void) 906 { 907 asm volatile ("sti; nop; cli"); 908 } 909 910 static inline unsigned long long rdrand(void) 911 { 912 long long r; 913 914 asm volatile("rdrand %0\n\t" 915 "jc 1f\n\t" 916 "mov $0, %0\n\t" 917 "1:\n\t" : "=r" (r)); 918 return r; 919 } 920 921 static inline unsigned long long rdtsc(void) 922 { 923 long long r; 924 925 #ifdef __x86_64__ 926 unsigned a, d; 927 928 asm volatile ("rdtsc" : "=a"(a), "=d"(d)); 929 r = a | ((long long)d << 32); 930 #else 931 asm volatile ("rdtsc" : "=A"(r)); 932 #endif 933 return r; 934 } 935 936 /* 937 * Per the advice in the SDM, volume 2, the sequence "mfence; lfence" 938 * executed immediately before rdtsc ensures that rdtsc will be 939 * executed only after all previous instructions have executed and all 940 * previous loads and stores are globally visible. In addition, the 941 * lfence immediately after rdtsc ensures that rdtsc will be executed 942 * prior to the execution of any subsequent instruction. 943 */ 944 static inline unsigned long long fenced_rdtsc(void) 945 { 946 unsigned long long tsc; 947 948 #ifdef __x86_64__ 949 unsigned int eax, edx; 950 951 asm volatile ("mfence; lfence; rdtsc; lfence" : "=a"(eax), "=d"(edx)); 952 tsc = eax | ((unsigned long long)edx << 32); 953 #else 954 asm volatile ("mfence; lfence; rdtsc; lfence" : "=A"(tsc)); 955 #endif 956 return tsc; 957 } 958 959 static inline unsigned long long rdtscp(u32 *aux) 960 { 961 long long r; 962 963 #ifdef __x86_64__ 964 unsigned a, d; 965 966 asm volatile ("rdtscp" : "=a"(a), "=d"(d), "=c"(*aux)); 967 r = a | ((long long)d << 32); 968 #else 969 asm volatile ("rdtscp" : "=A"(r), "=c"(*aux)); 970 #endif 971 return r; 972 } 973 974 static inline void wrtsc(u64 tsc) 975 { 976 wrmsr(MSR_IA32_TSC, tsc); 977 } 978 979 980 static inline void invlpg(volatile void *va) 981 { 982 asm volatile("invlpg (%0)" ::"r" (va) : "memory"); 983 } 984 985 struct invpcid_desc { 986 u64 pcid : 12; 987 u64 rsv : 52; 988 u64 addr : 64; 989 }; 990 991 static inline int invpcid_safe(unsigned long type, struct invpcid_desc *desc) 992 { 993 /* invpcid (%rax), %rbx */ 994 return asm_safe(".byte 0x66,0x0f,0x38,0x82,0x18", "a" (desc), "b" (type)); 995 } 996 997 /* 998 * Execute HLT in an STI interrupt shadow to ensure that a pending IRQ that's 999 * intended to be a wake event arrives *after* HLT is executed. Modern CPUs, 1000 * except for a few oddballs that KVM is unlikely to run on, block IRQs for one 1001 * instruction after STI, *if* RFLAGS.IF=0 before STI. Note, Intel CPUs may 1002 * block other events beyond regular IRQs, e.g. may block NMIs and SMIs too. 1003 */ 1004 static inline void safe_halt(void) 1005 { 1006 asm volatile("sti; hlt"); 1007 } 1008 1009 static inline u32 read_pkru(void) 1010 { 1011 unsigned int eax, edx; 1012 unsigned int ecx = 0; 1013 unsigned int pkru; 1014 1015 asm volatile(".byte 0x0f,0x01,0xee\n\t" 1016 : "=a" (eax), "=d" (edx) 1017 : "c" (ecx)); 1018 pkru = eax; 1019 return pkru; 1020 } 1021 1022 static inline void write_pkru(u32 pkru) 1023 { 1024 unsigned int eax = pkru; 1025 unsigned int ecx = 0; 1026 unsigned int edx = 0; 1027 1028 asm volatile(".byte 0x0f,0x01,0xef\n\t" 1029 : : "a" (eax), "c" (ecx), "d" (edx)); 1030 } 1031 1032 static inline bool is_canonical(u64 addr) 1033 { 1034 int va_width, shift_amt; 1035 1036 if (this_cpu_has_p(X86_PROPERTY_MAX_VIRT_ADDR)) 1037 va_width = this_cpu_property(X86_PROPERTY_MAX_VIRT_ADDR); 1038 else 1039 va_width = 48; 1040 1041 shift_amt = 64 - va_width; 1042 return (s64)(addr << shift_amt) >> shift_amt == addr; 1043 } 1044 1045 static inline void flush_tlb(void) 1046 { 1047 ulong cr4; 1048 1049 cr4 = read_cr4(); 1050 write_cr4(cr4 ^ X86_CR4_PGE); 1051 write_cr4(cr4); 1052 } 1053 1054 static inline void generate_non_canonical_gp(void) 1055 { 1056 *(volatile u64 *)NONCANONICAL = 0; 1057 } 1058 1059 static inline void generate_ud(void) 1060 { 1061 asm volatile ("ud2"); 1062 } 1063 1064 static inline void generate_de(void) 1065 { 1066 asm volatile ( 1067 "xor %%eax, %%eax\n\t" 1068 "xor %%ebx, %%ebx\n\t" 1069 "xor %%edx, %%edx\n\t" 1070 "idiv %%ebx\n\t" 1071 ::: "eax", "ebx", "edx"); 1072 } 1073 1074 static inline void generate_bp(void) 1075 { 1076 asm volatile ("int3"); 1077 } 1078 1079 static inline void generate_single_step_db(void) 1080 { 1081 write_rflags(read_rflags() | X86_EFLAGS_TF); 1082 asm volatile("nop"); 1083 } 1084 1085 static inline uint64_t generate_usermode_ac(void) 1086 { 1087 /* 1088 * Trigger an #AC by writing 8 bytes to a 4-byte aligned address. 1089 * Disclaimer: It is assumed that the stack pointer is aligned 1090 * on a 16-byte boundary as x86_64 stacks should be. 1091 */ 1092 asm volatile("movq $0, -0x4(%rsp)"); 1093 1094 return 0; 1095 } 1096 1097 /* 1098 * Switch from 64-bit to 32-bit mode and generate #OF via INTO. Note, if RIP 1099 * or RSP holds a 64-bit value, this helper will NOT generate #OF. 1100 */ 1101 static inline void generate_of(void) 1102 { 1103 struct far_pointer32 fp = { 1104 .offset = (uintptr_t)&&into, 1105 .selector = KERNEL_CS32, 1106 }; 1107 uintptr_t rsp; 1108 1109 asm volatile ("mov %%rsp, %0" : "=r"(rsp)); 1110 1111 if (fp.offset != (uintptr_t)&&into) { 1112 printf("Code address too high.\n"); 1113 return; 1114 } 1115 if ((u32)rsp != rsp) { 1116 printf("Stack address too high.\n"); 1117 return; 1118 } 1119 1120 asm goto ("lcall *%0" : : "m" (fp) : "rax" : into); 1121 return; 1122 into: 1123 asm volatile (".code32;" 1124 "movl $0x7fffffff, %eax;" 1125 "addl %eax, %eax;" 1126 "into;" 1127 "lret;" 1128 ".code64"); 1129 __builtin_unreachable(); 1130 } 1131 1132 static inline void fnop(void) 1133 { 1134 asm volatile("fnop"); 1135 } 1136 1137 /* If CR0.TS is set in L2, #NM is generated. */ 1138 static inline void generate_cr0_ts_nm(void) 1139 { 1140 write_cr0((read_cr0() & ~X86_CR0_EM) | X86_CR0_TS); 1141 fnop(); 1142 } 1143 1144 /* If CR0.TS is cleared and CR0.EM is set, #NM is generated. */ 1145 static inline void generate_cr0_em_nm(void) 1146 { 1147 write_cr0((read_cr0() & ~X86_CR0_TS) | X86_CR0_EM); 1148 fnop(); 1149 } 1150 1151 static inline bool is_la57_enabled(void) 1152 { 1153 return !!(read_cr4() & X86_CR4_LA57); 1154 } 1155 1156 static inline bool is_lam_sup_enabled(void) 1157 { 1158 return !!(read_cr4() & X86_CR4_LAM_SUP); 1159 } 1160 1161 static inline bool is_lam_u48_enabled(void) 1162 { 1163 return (read_cr3() & (X86_CR3_LAM_U48 | X86_CR3_LAM_U57)) == X86_CR3_LAM_U48; 1164 } 1165 1166 static inline bool is_lam_u57_enabled(void) 1167 { 1168 return !!(read_cr3() & X86_CR3_LAM_U57); 1169 } 1170 1171 #endif 1172