Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Kernel-based Virtual Machine driver for Linux |
| 3 | * cpuid support routines |
| 4 | * |
| 5 | * derived from arch/x86/kvm/x86.c |
| 6 | * |
| 7 | * Copyright 2011 Red Hat, Inc. and/or its affiliates. |
| 8 | * Copyright IBM Corporation, 2008 |
| 9 | * |
| 10 | * This work is licensed under the terms of the GNU GPL, version 2. See |
| 11 | * the COPYING file in the top-level directory. |
| 12 | * |
| 13 | */ |
| 14 | |
| 15 | #include <linux/kvm_host.h> |
| 16 | #include <linux/module.h> |
Jan Kiszka | bb5a798 | 2011-12-14 17:58:18 +0100 | [diff] [blame] | 17 | #include <linux/vmalloc.h> |
| 18 | #include <linux/uaccess.h> |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 19 | #include <asm/user.h> |
| 20 | #include <asm/xsave.h> |
| 21 | #include "cpuid.h" |
| 22 | #include "lapic.h" |
| 23 | #include "mmu.h" |
| 24 | #include "trace.h" |
| 25 | |
| 26 | void kvm_update_cpuid(struct kvm_vcpu *vcpu) |
| 27 | { |
| 28 | struct kvm_cpuid_entry2 *best; |
| 29 | struct kvm_lapic *apic = vcpu->arch.apic; |
| 30 | |
| 31 | best = kvm_find_cpuid_entry(vcpu, 1, 0); |
| 32 | if (!best) |
| 33 | return; |
| 34 | |
| 35 | /* Update OSXSAVE bit */ |
| 36 | if (cpu_has_xsave && best->function == 0x1) { |
| 37 | best->ecx &= ~(bit(X86_FEATURE_OSXSAVE)); |
| 38 | if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE)) |
| 39 | best->ecx |= bit(X86_FEATURE_OSXSAVE); |
| 40 | } |
| 41 | |
| 42 | if (apic) { |
| 43 | if (best->ecx & bit(X86_FEATURE_TSC_DEADLINE_TIMER)) |
| 44 | apic->lapic_timer.timer_mode_mask = 3 << 17; |
| 45 | else |
| 46 | apic->lapic_timer.timer_mode_mask = 1 << 17; |
| 47 | } |
Gleb Natapov | f5132b0 | 2011-11-10 14:57:22 +0200 | [diff] [blame] | 48 | |
| 49 | kvm_pmu_cpuid_update(vcpu); |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 50 | } |
| 51 | |
| 52 | static int is_efer_nx(void) |
| 53 | { |
| 54 | unsigned long long efer = 0; |
| 55 | |
| 56 | rdmsrl_safe(MSR_EFER, &efer); |
| 57 | return efer & EFER_NX; |
| 58 | } |
| 59 | |
| 60 | static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu) |
| 61 | { |
| 62 | int i; |
| 63 | struct kvm_cpuid_entry2 *e, *entry; |
| 64 | |
| 65 | entry = NULL; |
| 66 | for (i = 0; i < vcpu->arch.cpuid_nent; ++i) { |
| 67 | e = &vcpu->arch.cpuid_entries[i]; |
| 68 | if (e->function == 0x80000001) { |
| 69 | entry = e; |
| 70 | break; |
| 71 | } |
| 72 | } |
| 73 | if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) { |
| 74 | entry->edx &= ~(1 << 20); |
| 75 | printk(KERN_INFO "kvm: guest NX capability removed\n"); |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | /* when an old userspace process fills a new kernel module */ |
| 80 | int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu, |
| 81 | struct kvm_cpuid *cpuid, |
| 82 | struct kvm_cpuid_entry __user *entries) |
| 83 | { |
| 84 | int r, i; |
| 85 | struct kvm_cpuid_entry *cpuid_entries; |
| 86 | |
| 87 | r = -E2BIG; |
| 88 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) |
| 89 | goto out; |
| 90 | r = -ENOMEM; |
| 91 | cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent); |
| 92 | if (!cpuid_entries) |
| 93 | goto out; |
| 94 | r = -EFAULT; |
| 95 | if (copy_from_user(cpuid_entries, entries, |
| 96 | cpuid->nent * sizeof(struct kvm_cpuid_entry))) |
| 97 | goto out_free; |
| 98 | for (i = 0; i < cpuid->nent; i++) { |
| 99 | vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function; |
| 100 | vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax; |
| 101 | vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx; |
| 102 | vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx; |
| 103 | vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx; |
| 104 | vcpu->arch.cpuid_entries[i].index = 0; |
| 105 | vcpu->arch.cpuid_entries[i].flags = 0; |
| 106 | vcpu->arch.cpuid_entries[i].padding[0] = 0; |
| 107 | vcpu->arch.cpuid_entries[i].padding[1] = 0; |
| 108 | vcpu->arch.cpuid_entries[i].padding[2] = 0; |
| 109 | } |
| 110 | vcpu->arch.cpuid_nent = cpuid->nent; |
| 111 | cpuid_fix_nx_cap(vcpu); |
| 112 | r = 0; |
| 113 | kvm_apic_set_version(vcpu); |
| 114 | kvm_x86_ops->cpuid_update(vcpu); |
| 115 | kvm_update_cpuid(vcpu); |
| 116 | |
| 117 | out_free: |
| 118 | vfree(cpuid_entries); |
| 119 | out: |
| 120 | return r; |
| 121 | } |
| 122 | |
| 123 | int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu, |
| 124 | struct kvm_cpuid2 *cpuid, |
| 125 | struct kvm_cpuid_entry2 __user *entries) |
| 126 | { |
| 127 | int r; |
| 128 | |
| 129 | r = -E2BIG; |
| 130 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) |
| 131 | goto out; |
| 132 | r = -EFAULT; |
| 133 | if (copy_from_user(&vcpu->arch.cpuid_entries, entries, |
| 134 | cpuid->nent * sizeof(struct kvm_cpuid_entry2))) |
| 135 | goto out; |
| 136 | vcpu->arch.cpuid_nent = cpuid->nent; |
| 137 | kvm_apic_set_version(vcpu); |
| 138 | kvm_x86_ops->cpuid_update(vcpu); |
| 139 | kvm_update_cpuid(vcpu); |
| 140 | return 0; |
| 141 | |
| 142 | out: |
| 143 | return r; |
| 144 | } |
| 145 | |
| 146 | int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu, |
| 147 | struct kvm_cpuid2 *cpuid, |
| 148 | struct kvm_cpuid_entry2 __user *entries) |
| 149 | { |
| 150 | int r; |
| 151 | |
| 152 | r = -E2BIG; |
| 153 | if (cpuid->nent < vcpu->arch.cpuid_nent) |
| 154 | goto out; |
| 155 | r = -EFAULT; |
| 156 | if (copy_to_user(entries, &vcpu->arch.cpuid_entries, |
| 157 | vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2))) |
| 158 | goto out; |
| 159 | return 0; |
| 160 | |
| 161 | out: |
| 162 | cpuid->nent = vcpu->arch.cpuid_nent; |
| 163 | return r; |
| 164 | } |
| 165 | |
| 166 | static void cpuid_mask(u32 *word, int wordnum) |
| 167 | { |
| 168 | *word &= boot_cpu_data.x86_capability[wordnum]; |
| 169 | } |
| 170 | |
| 171 | static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function, |
| 172 | u32 index) |
| 173 | { |
| 174 | entry->function = function; |
| 175 | entry->index = index; |
| 176 | cpuid_count(entry->function, entry->index, |
| 177 | &entry->eax, &entry->ebx, &entry->ecx, &entry->edx); |
| 178 | entry->flags = 0; |
| 179 | } |
| 180 | |
| 181 | static bool supported_xcr0_bit(unsigned bit) |
| 182 | { |
| 183 | u64 mask = ((u64)1 << bit); |
| 184 | |
| 185 | return mask & (XSTATE_FP | XSTATE_SSE | XSTATE_YMM) & host_xcr0; |
| 186 | } |
| 187 | |
| 188 | #define F(x) bit(X86_FEATURE_##x) |
| 189 | |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 190 | static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 191 | u32 index, int *nent, int maxnent) |
| 192 | { |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 193 | int r; |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 194 | unsigned f_nx = is_efer_nx() ? F(NX) : 0; |
| 195 | #ifdef CONFIG_X86_64 |
| 196 | unsigned f_gbpages = (kvm_x86_ops->get_lpage_level() == PT_PDPE_LEVEL) |
| 197 | ? F(GBPAGES) : 0; |
| 198 | unsigned f_lm = F(LM); |
| 199 | #else |
| 200 | unsigned f_gbpages = 0; |
| 201 | unsigned f_lm = 0; |
| 202 | #endif |
| 203 | unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0; |
| 204 | |
| 205 | /* cpuid 1.edx */ |
| 206 | const u32 kvm_supported_word0_x86_features = |
| 207 | F(FPU) | F(VME) | F(DE) | F(PSE) | |
| 208 | F(TSC) | F(MSR) | F(PAE) | F(MCE) | |
| 209 | F(CX8) | F(APIC) | 0 /* Reserved */ | F(SEP) | |
| 210 | F(MTRR) | F(PGE) | F(MCA) | F(CMOV) | |
| 211 | F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLSH) | |
| 212 | 0 /* Reserved, DS, ACPI */ | F(MMX) | |
| 213 | F(FXSR) | F(XMM) | F(XMM2) | F(SELFSNOOP) | |
| 214 | 0 /* HTT, TM, Reserved, PBE */; |
| 215 | /* cpuid 0x80000001.edx */ |
| 216 | const u32 kvm_supported_word1_x86_features = |
| 217 | F(FPU) | F(VME) | F(DE) | F(PSE) | |
| 218 | F(TSC) | F(MSR) | F(PAE) | F(MCE) | |
| 219 | F(CX8) | F(APIC) | 0 /* Reserved */ | F(SYSCALL) | |
| 220 | F(MTRR) | F(PGE) | F(MCA) | F(CMOV) | |
| 221 | F(PAT) | F(PSE36) | 0 /* Reserved */ | |
| 222 | f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) | |
| 223 | F(FXSR) | F(FXSR_OPT) | f_gbpages | f_rdtscp | |
| 224 | 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW); |
| 225 | /* cpuid 1.ecx */ |
| 226 | const u32 kvm_supported_word4_x86_features = |
| 227 | F(XMM3) | F(PCLMULQDQ) | 0 /* DTES64, MONITOR */ | |
| 228 | 0 /* DS-CPL, VMX, SMX, EST */ | |
| 229 | 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ | |
Liu, Jinsong | fb21536 | 2011-11-28 03:55:19 -0800 | [diff] [blame] | 230 | F(FMA) | F(CX16) | 0 /* xTPR Update, PDCM */ | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 231 | 0 /* Reserved, DCA */ | F(XMM4_1) | |
| 232 | F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) | |
| 233 | 0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) | |
| 234 | F(F16C) | F(RDRAND); |
| 235 | /* cpuid 0x80000001.ecx */ |
| 236 | const u32 kvm_supported_word6_x86_features = |
| 237 | F(LAHF_LM) | F(CMP_LEGACY) | 0 /*SVM*/ | 0 /* ExtApicSpace */ | |
| 238 | F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) | |
Boris Ostrovsky | 2b036c6 | 2012-01-09 14:00:35 -0500 | [diff] [blame] | 239 | F(3DNOWPREFETCH) | F(OSVW) | 0 /* IBS */ | F(XOP) | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 240 | 0 /* SKINIT, WDT, LWP */ | F(FMA4) | F(TBM); |
| 241 | |
| 242 | /* cpuid 0xC0000001.edx */ |
| 243 | const u32 kvm_supported_word5_x86_features = |
| 244 | F(XSTORE) | F(XSTORE_EN) | F(XCRYPT) | F(XCRYPT_EN) | |
| 245 | F(ACE2) | F(ACE2_EN) | F(PHE) | F(PHE_EN) | |
| 246 | F(PMM) | F(PMM_EN); |
| 247 | |
| 248 | /* cpuid 7.0.ebx */ |
| 249 | const u32 kvm_supported_word9_x86_features = |
Liu, Jinsong | fb21536 | 2011-11-28 03:55:19 -0800 | [diff] [blame] | 250 | F(FSGSBASE) | F(BMI1) | F(AVX2) | F(SMEP) | F(BMI2) | F(ERMS); |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 251 | |
| 252 | /* all calls to cpuid_count() should be made on the same cpu */ |
| 253 | get_cpu(); |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 254 | |
| 255 | r = -E2BIG; |
| 256 | |
| 257 | if (*nent >= maxnent) |
| 258 | goto out; |
| 259 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 260 | do_cpuid_1_ent(entry, function, index); |
| 261 | ++*nent; |
| 262 | |
| 263 | switch (function) { |
| 264 | case 0: |
| 265 | entry->eax = min(entry->eax, (u32)0xd); |
| 266 | break; |
| 267 | case 1: |
| 268 | entry->edx &= kvm_supported_word0_x86_features; |
| 269 | cpuid_mask(&entry->edx, 0); |
| 270 | entry->ecx &= kvm_supported_word4_x86_features; |
| 271 | cpuid_mask(&entry->ecx, 4); |
| 272 | /* we support x2apic emulation even if host does not support |
| 273 | * it since we emulate x2apic in software */ |
| 274 | entry->ecx |= F(X2APIC); |
| 275 | break; |
| 276 | /* function 2 entries are STATEFUL. That is, repeated cpuid commands |
| 277 | * may return different values. This forces us to get_cpu() before |
| 278 | * issuing the first command, and also to emulate this annoying behavior |
| 279 | * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */ |
| 280 | case 2: { |
| 281 | int t, times = entry->eax & 0xff; |
| 282 | |
| 283 | entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; |
| 284 | entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT; |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 285 | for (t = 1; t < times; ++t) { |
| 286 | if (*nent >= maxnent) |
| 287 | goto out; |
| 288 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 289 | do_cpuid_1_ent(&entry[t], function, 0); |
| 290 | entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; |
| 291 | ++*nent; |
| 292 | } |
| 293 | break; |
| 294 | } |
| 295 | /* function 4 has additional index. */ |
| 296 | case 4: { |
| 297 | int i, cache_type; |
| 298 | |
| 299 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
| 300 | /* read more entries until cache_type is zero */ |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 301 | for (i = 1; ; ++i) { |
| 302 | if (*nent >= maxnent) |
| 303 | goto out; |
| 304 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 305 | cache_type = entry[i - 1].eax & 0x1f; |
| 306 | if (!cache_type) |
| 307 | break; |
| 308 | do_cpuid_1_ent(&entry[i], function, i); |
| 309 | entry[i].flags |= |
| 310 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
| 311 | ++*nent; |
| 312 | } |
| 313 | break; |
| 314 | } |
| 315 | case 7: { |
| 316 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
| 317 | /* Mask ebx against host capbability word 9 */ |
| 318 | if (index == 0) { |
| 319 | entry->ebx &= kvm_supported_word9_x86_features; |
| 320 | cpuid_mask(&entry->ebx, 9); |
| 321 | } else |
| 322 | entry->ebx = 0; |
| 323 | entry->eax = 0; |
| 324 | entry->ecx = 0; |
| 325 | entry->edx = 0; |
| 326 | break; |
| 327 | } |
| 328 | case 9: |
| 329 | break; |
Gleb Natapov | a6c06ed | 2011-11-10 14:57:28 +0200 | [diff] [blame] | 330 | case 0xa: { /* Architectural Performance Monitoring */ |
| 331 | struct x86_pmu_capability cap; |
| 332 | union cpuid10_eax eax; |
| 333 | union cpuid10_edx edx; |
| 334 | |
| 335 | perf_get_x86_pmu_capability(&cap); |
| 336 | |
| 337 | /* |
| 338 | * Only support guest architectural pmu on a host |
| 339 | * with architectural pmu. |
| 340 | */ |
| 341 | if (!cap.version) |
| 342 | memset(&cap, 0, sizeof(cap)); |
| 343 | |
| 344 | eax.split.version_id = min(cap.version, 2); |
| 345 | eax.split.num_counters = cap.num_counters_gp; |
| 346 | eax.split.bit_width = cap.bit_width_gp; |
| 347 | eax.split.mask_length = cap.events_mask_len; |
| 348 | |
| 349 | edx.split.num_counters_fixed = cap.num_counters_fixed; |
| 350 | edx.split.bit_width_fixed = cap.bit_width_fixed; |
| 351 | edx.split.reserved = 0; |
| 352 | |
| 353 | entry->eax = eax.full; |
| 354 | entry->ebx = cap.events_mask; |
| 355 | entry->ecx = 0; |
| 356 | entry->edx = edx.full; |
| 357 | break; |
| 358 | } |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 359 | /* function 0xb has additional index. */ |
| 360 | case 0xb: { |
| 361 | int i, level_type; |
| 362 | |
| 363 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
| 364 | /* read more entries until level_type is zero */ |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 365 | for (i = 1; ; ++i) { |
| 366 | if (*nent >= maxnent) |
| 367 | goto out; |
| 368 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 369 | level_type = entry[i - 1].ecx & 0xff00; |
| 370 | if (!level_type) |
| 371 | break; |
| 372 | do_cpuid_1_ent(&entry[i], function, i); |
| 373 | entry[i].flags |= |
| 374 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
| 375 | ++*nent; |
| 376 | } |
| 377 | break; |
| 378 | } |
| 379 | case 0xd: { |
| 380 | int idx, i; |
| 381 | |
| 382 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 383 | for (idx = 1, i = 1; idx < 64; ++idx) { |
| 384 | if (*nent >= maxnent) |
| 385 | goto out; |
| 386 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 387 | do_cpuid_1_ent(&entry[i], function, idx); |
| 388 | if (entry[i].eax == 0 || !supported_xcr0_bit(idx)) |
| 389 | continue; |
| 390 | entry[i].flags |= |
| 391 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
| 392 | ++*nent; |
| 393 | ++i; |
| 394 | } |
| 395 | break; |
| 396 | } |
| 397 | case KVM_CPUID_SIGNATURE: { |
| 398 | char signature[12] = "KVMKVMKVM\0\0"; |
| 399 | u32 *sigptr = (u32 *)signature; |
| 400 | entry->eax = 0; |
| 401 | entry->ebx = sigptr[0]; |
| 402 | entry->ecx = sigptr[1]; |
| 403 | entry->edx = sigptr[2]; |
| 404 | break; |
| 405 | } |
| 406 | case KVM_CPUID_FEATURES: |
| 407 | entry->eax = (1 << KVM_FEATURE_CLOCKSOURCE) | |
| 408 | (1 << KVM_FEATURE_NOP_IO_DELAY) | |
| 409 | (1 << KVM_FEATURE_CLOCKSOURCE2) | |
| 410 | (1 << KVM_FEATURE_ASYNC_PF) | |
| 411 | (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT); |
| 412 | |
| 413 | if (sched_info_on()) |
| 414 | entry->eax |= (1 << KVM_FEATURE_STEAL_TIME); |
| 415 | |
| 416 | entry->ebx = 0; |
| 417 | entry->ecx = 0; |
| 418 | entry->edx = 0; |
| 419 | break; |
| 420 | case 0x80000000: |
| 421 | entry->eax = min(entry->eax, 0x8000001a); |
| 422 | break; |
| 423 | case 0x80000001: |
| 424 | entry->edx &= kvm_supported_word1_x86_features; |
| 425 | cpuid_mask(&entry->edx, 1); |
| 426 | entry->ecx &= kvm_supported_word6_x86_features; |
| 427 | cpuid_mask(&entry->ecx, 6); |
| 428 | break; |
| 429 | case 0x80000008: { |
| 430 | unsigned g_phys_as = (entry->eax >> 16) & 0xff; |
| 431 | unsigned virt_as = max((entry->eax >> 8) & 0xff, 48U); |
| 432 | unsigned phys_as = entry->eax & 0xff; |
| 433 | |
| 434 | if (!g_phys_as) |
| 435 | g_phys_as = phys_as; |
| 436 | entry->eax = g_phys_as | (virt_as << 8); |
| 437 | entry->ebx = entry->edx = 0; |
| 438 | break; |
| 439 | } |
| 440 | case 0x80000019: |
| 441 | entry->ecx = entry->edx = 0; |
| 442 | break; |
| 443 | case 0x8000001a: |
| 444 | break; |
| 445 | case 0x8000001d: |
| 446 | break; |
| 447 | /*Add support for Centaur's CPUID instruction*/ |
| 448 | case 0xC0000000: |
| 449 | /*Just support up to 0xC0000004 now*/ |
| 450 | entry->eax = min(entry->eax, 0xC0000004); |
| 451 | break; |
| 452 | case 0xC0000001: |
| 453 | entry->edx &= kvm_supported_word5_x86_features; |
| 454 | cpuid_mask(&entry->edx, 5); |
| 455 | break; |
| 456 | case 3: /* Processor serial number */ |
| 457 | case 5: /* MONITOR/MWAIT */ |
| 458 | case 6: /* Thermal management */ |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 459 | case 0x80000007: /* Advanced power management */ |
| 460 | case 0xC0000002: |
| 461 | case 0xC0000003: |
| 462 | case 0xC0000004: |
| 463 | default: |
| 464 | entry->eax = entry->ebx = entry->ecx = entry->edx = 0; |
| 465 | break; |
| 466 | } |
| 467 | |
| 468 | kvm_x86_ops->set_supported_cpuid(function, entry); |
| 469 | |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 470 | r = 0; |
| 471 | |
| 472 | out: |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 473 | put_cpu(); |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 474 | |
| 475 | return r; |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 476 | } |
| 477 | |
| 478 | #undef F |
| 479 | |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 480 | struct kvm_cpuid_param { |
| 481 | u32 func; |
| 482 | u32 idx; |
| 483 | bool has_leaf_count; |
| 484 | bool (*qualifier)(struct kvm_cpuid_param *param); |
| 485 | }; |
| 486 | |
| 487 | static bool is_centaur_cpu(struct kvm_cpuid_param *param) |
| 488 | { |
| 489 | return boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR; |
| 490 | } |
| 491 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 492 | int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid, |
| 493 | struct kvm_cpuid_entry2 __user *entries) |
| 494 | { |
| 495 | struct kvm_cpuid_entry2 *cpuid_entries; |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 496 | int limit, nent = 0, r = -E2BIG, i; |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 497 | u32 func; |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 498 | static struct kvm_cpuid_param param[] = { |
| 499 | { .func = 0, .has_leaf_count = true }, |
| 500 | { .func = 0x80000000, .has_leaf_count = true }, |
| 501 | { .func = 0xC0000000, .qualifier = is_centaur_cpu, .has_leaf_count = true }, |
| 502 | { .func = KVM_CPUID_SIGNATURE }, |
| 503 | { .func = KVM_CPUID_FEATURES }, |
| 504 | }; |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 505 | |
| 506 | if (cpuid->nent < 1) |
| 507 | goto out; |
| 508 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) |
| 509 | cpuid->nent = KVM_MAX_CPUID_ENTRIES; |
| 510 | r = -ENOMEM; |
| 511 | cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent); |
| 512 | if (!cpuid_entries) |
| 513 | goto out; |
| 514 | |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 515 | r = 0; |
| 516 | for (i = 0; i < ARRAY_SIZE(param); i++) { |
| 517 | struct kvm_cpuid_param *ent = ¶m[i]; |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 518 | |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 519 | if (ent->qualifier && !ent->qualifier(ent)) |
| 520 | continue; |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 521 | |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 522 | r = do_cpuid_ent(&cpuid_entries[nent], ent->func, ent->idx, |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 523 | &nent, cpuid->nent); |
| 524 | |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 525 | if (r) |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 526 | goto out_free; |
| 527 | |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 528 | if (!ent->has_leaf_count) |
| 529 | continue; |
| 530 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 531 | limit = cpuid_entries[nent - 1].eax; |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 532 | for (func = ent->func + 1; func <= limit && nent < cpuid->nent && r == 0; ++func) |
| 533 | r = do_cpuid_ent(&cpuid_entries[nent], func, ent->idx, |
| 534 | &nent, cpuid->nent); |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 535 | |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 536 | if (r) |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 537 | goto out_free; |
| 538 | } |
| 539 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 540 | r = -EFAULT; |
| 541 | if (copy_to_user(entries, cpuid_entries, |
| 542 | nent * sizeof(struct kvm_cpuid_entry2))) |
| 543 | goto out_free; |
| 544 | cpuid->nent = nent; |
| 545 | r = 0; |
| 546 | |
| 547 | out_free: |
| 548 | vfree(cpuid_entries); |
| 549 | out: |
| 550 | return r; |
| 551 | } |
| 552 | |
| 553 | static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i) |
| 554 | { |
| 555 | struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i]; |
| 556 | int j, nent = vcpu->arch.cpuid_nent; |
| 557 | |
| 558 | e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT; |
| 559 | /* when no next entry is found, the current entry[i] is reselected */ |
| 560 | for (j = i + 1; ; j = (j + 1) % nent) { |
| 561 | struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j]; |
| 562 | if (ej->function == e->function) { |
| 563 | ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT; |
| 564 | return j; |
| 565 | } |
| 566 | } |
| 567 | return 0; /* silence gcc, even though control never reaches here */ |
| 568 | } |
| 569 | |
| 570 | /* find an entry with matching function, matching index (if needed), and that |
| 571 | * should be read next (if it's stateful) */ |
| 572 | static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e, |
| 573 | u32 function, u32 index) |
| 574 | { |
| 575 | if (e->function != function) |
| 576 | return 0; |
| 577 | if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index) |
| 578 | return 0; |
| 579 | if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) && |
| 580 | !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT)) |
| 581 | return 0; |
| 582 | return 1; |
| 583 | } |
| 584 | |
| 585 | struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu, |
| 586 | u32 function, u32 index) |
| 587 | { |
| 588 | int i; |
| 589 | struct kvm_cpuid_entry2 *best = NULL; |
| 590 | |
| 591 | for (i = 0; i < vcpu->arch.cpuid_nent; ++i) { |
| 592 | struct kvm_cpuid_entry2 *e; |
| 593 | |
| 594 | e = &vcpu->arch.cpuid_entries[i]; |
| 595 | if (is_matching_cpuid_entry(e, function, index)) { |
| 596 | if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) |
| 597 | move_to_next_stateful_cpuid_entry(vcpu, i); |
| 598 | best = e; |
| 599 | break; |
| 600 | } |
| 601 | } |
| 602 | return best; |
| 603 | } |
| 604 | EXPORT_SYMBOL_GPL(kvm_find_cpuid_entry); |
| 605 | |
| 606 | int cpuid_maxphyaddr(struct kvm_vcpu *vcpu) |
| 607 | { |
| 608 | struct kvm_cpuid_entry2 *best; |
| 609 | |
| 610 | best = kvm_find_cpuid_entry(vcpu, 0x80000000, 0); |
| 611 | if (!best || best->eax < 0x80000008) |
| 612 | goto not_found; |
| 613 | best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0); |
| 614 | if (best) |
| 615 | return best->eax & 0xff; |
| 616 | not_found: |
| 617 | return 36; |
| 618 | } |
| 619 | |
| 620 | /* |
| 621 | * If no match is found, check whether we exceed the vCPU's limit |
| 622 | * and return the content of the highest valid _standard_ leaf instead. |
| 623 | * This is to satisfy the CPUID specification. |
| 624 | */ |
| 625 | static struct kvm_cpuid_entry2* check_cpuid_limit(struct kvm_vcpu *vcpu, |
| 626 | u32 function, u32 index) |
| 627 | { |
| 628 | struct kvm_cpuid_entry2 *maxlevel; |
| 629 | |
| 630 | maxlevel = kvm_find_cpuid_entry(vcpu, function & 0x80000000, 0); |
| 631 | if (!maxlevel || maxlevel->eax >= function) |
| 632 | return NULL; |
| 633 | if (function & 0x80000000) { |
| 634 | maxlevel = kvm_find_cpuid_entry(vcpu, 0, 0); |
| 635 | if (!maxlevel) |
| 636 | return NULL; |
| 637 | } |
| 638 | return kvm_find_cpuid_entry(vcpu, maxlevel->eax, index); |
| 639 | } |
| 640 | |
| 641 | void kvm_emulate_cpuid(struct kvm_vcpu *vcpu) |
| 642 | { |
| 643 | u32 function, index; |
| 644 | struct kvm_cpuid_entry2 *best; |
| 645 | |
| 646 | function = kvm_register_read(vcpu, VCPU_REGS_RAX); |
| 647 | index = kvm_register_read(vcpu, VCPU_REGS_RCX); |
| 648 | kvm_register_write(vcpu, VCPU_REGS_RAX, 0); |
| 649 | kvm_register_write(vcpu, VCPU_REGS_RBX, 0); |
| 650 | kvm_register_write(vcpu, VCPU_REGS_RCX, 0); |
| 651 | kvm_register_write(vcpu, VCPU_REGS_RDX, 0); |
| 652 | best = kvm_find_cpuid_entry(vcpu, function, index); |
| 653 | |
| 654 | if (!best) |
| 655 | best = check_cpuid_limit(vcpu, function, index); |
| 656 | |
| 657 | if (best) { |
| 658 | kvm_register_write(vcpu, VCPU_REGS_RAX, best->eax); |
| 659 | kvm_register_write(vcpu, VCPU_REGS_RBX, best->ebx); |
| 660 | kvm_register_write(vcpu, VCPU_REGS_RCX, best->ecx); |
| 661 | kvm_register_write(vcpu, VCPU_REGS_RDX, best->edx); |
| 662 | } |
| 663 | kvm_x86_ops->skip_emulated_instruction(vcpu); |
| 664 | trace_kvm_cpuid(function, |
| 665 | kvm_register_read(vcpu, VCPU_REGS_RAX), |
| 666 | kvm_register_read(vcpu, VCPU_REGS_RBX), |
| 667 | kvm_register_read(vcpu, VCPU_REGS_RCX), |
| 668 | kvm_register_read(vcpu, VCPU_REGS_RDX)); |
| 669 | } |
| 670 | EXPORT_SYMBOL_GPL(kvm_emulate_cpuid); |