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Commit | Line | Data |
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00b27a3e AK |
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> | |
1767e931 | 16 | #include <linux/export.h> |
bb5a798a JK |
17 | #include <linux/vmalloc.h> |
18 | #include <linux/uaccess.h> | |
3905f9ad IM |
19 | #include <linux/sched/stat.h> |
20 | ||
4504b5c9 | 21 | #include <asm/processor.h> |
00b27a3e | 22 | #include <asm/user.h> |
669ebabb | 23 | #include <asm/fpu/xstate.h> |
00b27a3e AK |
24 | #include "cpuid.h" |
25 | #include "lapic.h" | |
26 | #include "mmu.h" | |
27 | #include "trace.h" | |
474a5bb9 | 28 | #include "pmu.h" |
00b27a3e | 29 | |
412a3c41 | 30 | static u32 xstate_required_size(u64 xstate_bv, bool compacted) |
4344ee98 PB |
31 | { |
32 | int feature_bit = 0; | |
33 | u32 ret = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET; | |
34 | ||
d91cab78 | 35 | xstate_bv &= XFEATURE_MASK_EXTEND; |
4344ee98 PB |
36 | while (xstate_bv) { |
37 | if (xstate_bv & 0x1) { | |
412a3c41 | 38 | u32 eax, ebx, ecx, edx, offset; |
4344ee98 | 39 | cpuid_count(0xD, feature_bit, &eax, &ebx, &ecx, &edx); |
412a3c41 PB |
40 | offset = compacted ? ret : ebx; |
41 | ret = max(ret, offset + eax); | |
4344ee98 PB |
42 | } |
43 | ||
44 | xstate_bv >>= 1; | |
45 | feature_bit++; | |
46 | } | |
47 | ||
48 | return ret; | |
49 | } | |
50 | ||
a87036ad PB |
51 | bool kvm_mpx_supported(void) |
52 | { | |
53 | return ((host_xcr0 & (XFEATURE_MASK_BNDREGS | XFEATURE_MASK_BNDCSR)) | |
54 | && kvm_x86_ops->mpx_supported()); | |
55 | } | |
56 | EXPORT_SYMBOL_GPL(kvm_mpx_supported); | |
57 | ||
4ff41732 PB |
58 | u64 kvm_supported_xcr0(void) |
59 | { | |
60 | u64 xcr0 = KVM_SUPPORTED_XCR0 & host_xcr0; | |
61 | ||
a87036ad | 62 | if (!kvm_mpx_supported()) |
d91cab78 | 63 | xcr0 &= ~(XFEATURE_MASK_BNDREGS | XFEATURE_MASK_BNDCSR); |
4ff41732 PB |
64 | |
65 | return xcr0; | |
66 | } | |
67 | ||
5c404cab PB |
68 | #define F(x) bit(X86_FEATURE_##x) |
69 | ||
0fb3c779 | 70 | /* For scattered features from cpufeatures.h; we currently expose none */ |
4504b5c9 LK |
71 | #define KF(x) bit(KVM_CPUID_BIT_##x) |
72 | ||
dd598091 | 73 | int kvm_update_cpuid(struct kvm_vcpu *vcpu) |
00b27a3e AK |
74 | { |
75 | struct kvm_cpuid_entry2 *best; | |
76 | struct kvm_lapic *apic = vcpu->arch.apic; | |
77 | ||
78 | best = kvm_find_cpuid_entry(vcpu, 1, 0); | |
79 | if (!best) | |
dd598091 | 80 | return 0; |
00b27a3e AK |
81 | |
82 | /* Update OSXSAVE bit */ | |
d366bf7e | 83 | if (boot_cpu_has(X86_FEATURE_XSAVE) && best->function == 0x1) { |
5c404cab | 84 | best->ecx &= ~F(OSXSAVE); |
00b27a3e | 85 | if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE)) |
5c404cab | 86 | best->ecx |= F(OSXSAVE); |
00b27a3e AK |
87 | } |
88 | ||
c7dd15b3 JM |
89 | best->edx &= ~F(APIC); |
90 | if (vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE) | |
91 | best->edx |= F(APIC); | |
92 | ||
00b27a3e | 93 | if (apic) { |
5c404cab | 94 | if (best->ecx & F(TSC_DEADLINE_TIMER)) |
00b27a3e AK |
95 | apic->lapic_timer.timer_mode_mask = 3 << 17; |
96 | else | |
97 | apic->lapic_timer.timer_mode_mask = 1 << 17; | |
98 | } | |
f5132b01 | 99 | |
b9baba86 HH |
100 | best = kvm_find_cpuid_entry(vcpu, 7, 0); |
101 | if (best) { | |
102 | /* Update OSPKE bit */ | |
103 | if (boot_cpu_has(X86_FEATURE_PKU) && best->function == 0x7) { | |
104 | best->ecx &= ~F(OSPKE); | |
105 | if (kvm_read_cr4_bits(vcpu, X86_CR4_PKE)) | |
106 | best->ecx |= F(OSPKE); | |
107 | } | |
108 | } | |
109 | ||
d7876f1b | 110 | best = kvm_find_cpuid_entry(vcpu, 0xD, 0); |
4344ee98 | 111 | if (!best) { |
d7876f1b | 112 | vcpu->arch.guest_supported_xcr0 = 0; |
4344ee98 PB |
113 | vcpu->arch.guest_xstate_size = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET; |
114 | } else { | |
d7876f1b PB |
115 | vcpu->arch.guest_supported_xcr0 = |
116 | (best->eax | ((u64)best->edx << 32)) & | |
4ff41732 | 117 | kvm_supported_xcr0(); |
56c103ec | 118 | vcpu->arch.guest_xstate_size = best->ebx = |
412a3c41 | 119 | xstate_required_size(vcpu->arch.xcr0, false); |
4344ee98 | 120 | } |
d7876f1b | 121 | |
412a3c41 PB |
122 | best = kvm_find_cpuid_entry(vcpu, 0xD, 1); |
123 | if (best && (best->eax & (F(XSAVES) | F(XSAVEC)))) | |
124 | best->ebx = xstate_required_size(vcpu->arch.xcr0, true); | |
125 | ||
dd598091 | 126 | /* |
fd8cb433 YZ |
127 | * The existing code assumes virtual address is 48-bit or 57-bit in the |
128 | * canonical address checks; exit if it is ever changed. | |
dd598091 NA |
129 | */ |
130 | best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0); | |
fd8cb433 YZ |
131 | if (best) { |
132 | int vaddr_bits = (best->eax & 0xff00) >> 8; | |
133 | ||
134 | if (vaddr_bits != 48 && vaddr_bits != 57 && vaddr_bits != 0) | |
135 | return -EINVAL; | |
136 | } | |
dd598091 | 137 | |
5a4f55cd EK |
138 | /* Update physical-address width */ |
139 | vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu); | |
855feb67 | 140 | kvm_mmu_reset_context(vcpu); |
5a4f55cd | 141 | |
c6702c9d | 142 | kvm_pmu_refresh(vcpu); |
dd598091 | 143 | return 0; |
00b27a3e AK |
144 | } |
145 | ||
146 | static int is_efer_nx(void) | |
147 | { | |
148 | unsigned long long efer = 0; | |
149 | ||
150 | rdmsrl_safe(MSR_EFER, &efer); | |
151 | return efer & EFER_NX; | |
152 | } | |
153 | ||
154 | static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu) | |
155 | { | |
156 | int i; | |
157 | struct kvm_cpuid_entry2 *e, *entry; | |
158 | ||
159 | entry = NULL; | |
160 | for (i = 0; i < vcpu->arch.cpuid_nent; ++i) { | |
161 | e = &vcpu->arch.cpuid_entries[i]; | |
162 | if (e->function == 0x80000001) { | |
163 | entry = e; | |
164 | break; | |
165 | } | |
166 | } | |
5c404cab PB |
167 | if (entry && (entry->edx & F(NX)) && !is_efer_nx()) { |
168 | entry->edx &= ~F(NX); | |
00b27a3e AK |
169 | printk(KERN_INFO "kvm: guest NX capability removed\n"); |
170 | } | |
171 | } | |
172 | ||
5a4f55cd EK |
173 | int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu) |
174 | { | |
175 | struct kvm_cpuid_entry2 *best; | |
176 | ||
177 | best = kvm_find_cpuid_entry(vcpu, 0x80000000, 0); | |
178 | if (!best || best->eax < 0x80000008) | |
179 | goto not_found; | |
180 | best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0); | |
181 | if (best) | |
182 | return best->eax & 0xff; | |
183 | not_found: | |
184 | return 36; | |
185 | } | |
186 | EXPORT_SYMBOL_GPL(cpuid_query_maxphyaddr); | |
187 | ||
00b27a3e AK |
188 | /* when an old userspace process fills a new kernel module */ |
189 | int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu, | |
190 | struct kvm_cpuid *cpuid, | |
191 | struct kvm_cpuid_entry __user *entries) | |
192 | { | |
193 | int r, i; | |
83676e92 | 194 | struct kvm_cpuid_entry *cpuid_entries = NULL; |
00b27a3e AK |
195 | |
196 | r = -E2BIG; | |
197 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) | |
198 | goto out; | |
199 | r = -ENOMEM; | |
83676e92 PB |
200 | if (cpuid->nent) { |
201 | cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * | |
202 | cpuid->nent); | |
203 | if (!cpuid_entries) | |
204 | goto out; | |
205 | r = -EFAULT; | |
206 | if (copy_from_user(cpuid_entries, entries, | |
207 | cpuid->nent * sizeof(struct kvm_cpuid_entry))) | |
208 | goto out; | |
209 | } | |
00b27a3e AK |
210 | for (i = 0; i < cpuid->nent; i++) { |
211 | vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function; | |
212 | vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax; | |
213 | vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx; | |
214 | vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx; | |
215 | vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx; | |
216 | vcpu->arch.cpuid_entries[i].index = 0; | |
217 | vcpu->arch.cpuid_entries[i].flags = 0; | |
218 | vcpu->arch.cpuid_entries[i].padding[0] = 0; | |
219 | vcpu->arch.cpuid_entries[i].padding[1] = 0; | |
220 | vcpu->arch.cpuid_entries[i].padding[2] = 0; | |
221 | } | |
222 | vcpu->arch.cpuid_nent = cpuid->nent; | |
223 | cpuid_fix_nx_cap(vcpu); | |
00b27a3e AK |
224 | kvm_apic_set_version(vcpu); |
225 | kvm_x86_ops->cpuid_update(vcpu); | |
dd598091 | 226 | r = kvm_update_cpuid(vcpu); |
00b27a3e | 227 | |
00b27a3e | 228 | out: |
83676e92 | 229 | vfree(cpuid_entries); |
00b27a3e AK |
230 | return r; |
231 | } | |
232 | ||
233 | int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu, | |
234 | struct kvm_cpuid2 *cpuid, | |
235 | struct kvm_cpuid_entry2 __user *entries) | |
236 | { | |
237 | int r; | |
238 | ||
239 | r = -E2BIG; | |
240 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) | |
241 | goto out; | |
242 | r = -EFAULT; | |
243 | if (copy_from_user(&vcpu->arch.cpuid_entries, entries, | |
244 | cpuid->nent * sizeof(struct kvm_cpuid_entry2))) | |
245 | goto out; | |
246 | vcpu->arch.cpuid_nent = cpuid->nent; | |
247 | kvm_apic_set_version(vcpu); | |
248 | kvm_x86_ops->cpuid_update(vcpu); | |
dd598091 | 249 | r = kvm_update_cpuid(vcpu); |
00b27a3e AK |
250 | out: |
251 | return r; | |
252 | } | |
253 | ||
254 | int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu, | |
255 | struct kvm_cpuid2 *cpuid, | |
256 | struct kvm_cpuid_entry2 __user *entries) | |
257 | { | |
258 | int r; | |
259 | ||
260 | r = -E2BIG; | |
261 | if (cpuid->nent < vcpu->arch.cpuid_nent) | |
262 | goto out; | |
263 | r = -EFAULT; | |
264 | if (copy_to_user(entries, &vcpu->arch.cpuid_entries, | |
265 | vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2))) | |
266 | goto out; | |
267 | return 0; | |
268 | ||
269 | out: | |
270 | cpuid->nent = vcpu->arch.cpuid_nent; | |
271 | return r; | |
272 | } | |
273 | ||
274 | static void cpuid_mask(u32 *word, int wordnum) | |
275 | { | |
276 | *word &= boot_cpu_data.x86_capability[wordnum]; | |
277 | } | |
278 | ||
279 | static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function, | |
280 | u32 index) | |
281 | { | |
282 | entry->function = function; | |
283 | entry->index = index; | |
284 | cpuid_count(entry->function, entry->index, | |
285 | &entry->eax, &entry->ebx, &entry->ecx, &entry->edx); | |
286 | entry->flags = 0; | |
287 | } | |
288 | ||
9c15bb1d BP |
289 | static int __do_cpuid_ent_emulated(struct kvm_cpuid_entry2 *entry, |
290 | u32 func, u32 index, int *nent, int maxnent) | |
291 | { | |
84cffe49 BP |
292 | switch (func) { |
293 | case 0: | |
294 | entry->eax = 1; /* only one leaf currently */ | |
295 | ++*nent; | |
296 | break; | |
297 | case 1: | |
298 | entry->ecx = F(MOVBE); | |
299 | ++*nent; | |
300 | break; | |
301 | default: | |
302 | break; | |
303 | } | |
304 | ||
305 | entry->function = func; | |
306 | entry->index = index; | |
307 | ||
9c15bb1d BP |
308 | return 0; |
309 | } | |
310 | ||
311 | static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, | |
312 | u32 index, int *nent, int maxnent) | |
00b27a3e | 313 | { |
831bf664 | 314 | int r; |
00b27a3e AK |
315 | unsigned f_nx = is_efer_nx() ? F(NX) : 0; |
316 | #ifdef CONFIG_X86_64 | |
317 | unsigned f_gbpages = (kvm_x86_ops->get_lpage_level() == PT_PDPE_LEVEL) | |
318 | ? F(GBPAGES) : 0; | |
319 | unsigned f_lm = F(LM); | |
320 | #else | |
321 | unsigned f_gbpages = 0; | |
322 | unsigned f_lm = 0; | |
323 | #endif | |
324 | unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0; | |
ad756a16 | 325 | unsigned f_invpcid = kvm_x86_ops->invpcid_supported() ? F(INVPCID) : 0; |
a87036ad | 326 | unsigned f_mpx = kvm_mpx_supported() ? F(MPX) : 0; |
55412b2e | 327 | unsigned f_xsaves = kvm_x86_ops->xsaves_supported() ? F(XSAVES) : 0; |
00b27a3e AK |
328 | |
329 | /* cpuid 1.edx */ | |
e0b18ef7 | 330 | const u32 kvm_cpuid_1_edx_x86_features = |
00b27a3e AK |
331 | F(FPU) | F(VME) | F(DE) | F(PSE) | |
332 | F(TSC) | F(MSR) | F(PAE) | F(MCE) | | |
333 | F(CX8) | F(APIC) | 0 /* Reserved */ | F(SEP) | | |
334 | F(MTRR) | F(PGE) | F(MCA) | F(CMOV) | | |
840d2830 | 335 | F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLUSH) | |
00b27a3e AK |
336 | 0 /* Reserved, DS, ACPI */ | F(MMX) | |
337 | F(FXSR) | F(XMM) | F(XMM2) | F(SELFSNOOP) | | |
338 | 0 /* HTT, TM, Reserved, PBE */; | |
339 | /* cpuid 0x80000001.edx */ | |
e0b18ef7 | 340 | const u32 kvm_cpuid_8000_0001_edx_x86_features = |
00b27a3e AK |
341 | F(FPU) | F(VME) | F(DE) | F(PSE) | |
342 | F(TSC) | F(MSR) | F(PAE) | F(MCE) | | |
343 | F(CX8) | F(APIC) | 0 /* Reserved */ | F(SYSCALL) | | |
344 | F(MTRR) | F(PGE) | F(MCA) | F(CMOV) | | |
345 | F(PAT) | F(PSE36) | 0 /* Reserved */ | | |
346 | f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) | | |
347 | F(FXSR) | F(FXSR_OPT) | f_gbpages | f_rdtscp | | |
348 | 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW); | |
349 | /* cpuid 1.ecx */ | |
e0b18ef7 | 350 | const u32 kvm_cpuid_1_ecx_x86_features = |
87c00572 GS |
351 | /* NOTE: MONITOR (and MWAIT) are emulated as NOP, |
352 | * but *not* advertised to guests via CPUID ! */ | |
00b27a3e AK |
353 | F(XMM3) | F(PCLMULQDQ) | 0 /* DTES64, MONITOR */ | |
354 | 0 /* DS-CPL, VMX, SMX, EST */ | | |
355 | 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ | | |
fb215366 | 356 | F(FMA) | F(CX16) | 0 /* xTPR Update, PDCM */ | |
ad756a16 | 357 | F(PCID) | 0 /* Reserved, DCA */ | F(XMM4_1) | |
00b27a3e AK |
358 | F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) | |
359 | 0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) | | |
360 | F(F16C) | F(RDRAND); | |
361 | /* cpuid 0x80000001.ecx */ | |
e0b18ef7 | 362 | const u32 kvm_cpuid_8000_0001_ecx_x86_features = |
00b27a3e AK |
363 | F(LAHF_LM) | F(CMP_LEGACY) | 0 /*SVM*/ | 0 /* ExtApicSpace */ | |
364 | F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) | | |
2b036c6b | 365 | F(3DNOWPREFETCH) | F(OSVW) | 0 /* IBS */ | F(XOP) | |
00b27a3e AK |
366 | 0 /* SKINIT, WDT, LWP */ | F(FMA4) | F(TBM); |
367 | ||
33241bfe AR |
368 | /* cpuid 0x80000008.ebx */ |
369 | const u32 kvm_cpuid_8000_0008_ebx_x86_features = | |
3b881627 | 370 | F(AMD_IBPB) | F(AMD_IBRS) | F(AMD_SSBD) | F(VIRT_SSBD) | |
49c2ba6c | 371 | F(AMD_SSB_NO) | F(AMD_STIBP); |
33241bfe | 372 | |
00b27a3e | 373 | /* cpuid 0xC0000001.edx */ |
e0b18ef7 | 374 | const u32 kvm_cpuid_C000_0001_edx_x86_features = |
00b27a3e AK |
375 | F(XSTORE) | F(XSTORE_EN) | F(XCRYPT) | F(XCRYPT_EN) | |
376 | F(ACE2) | F(ACE2_EN) | F(PHE) | F(PHE_EN) | | |
377 | F(PMM) | F(PMM_EN); | |
378 | ||
379 | /* cpuid 7.0.ebx */ | |
e0b18ef7 | 380 | const u32 kvm_cpuid_7_0_ebx_x86_features = |
83c52915 | 381 | F(FSGSBASE) | F(BMI1) | F(HLE) | F(AVX2) | F(SMEP) | |
390bd528 | 382 | F(BMI2) | F(ERMS) | f_invpcid | F(RTM) | f_mpx | F(RDSEED) | |
83781d18 YS |
383 | F(ADX) | F(SMAP) | F(AVX512IFMA) | F(AVX512F) | F(AVX512PF) | |
384 | F(AVX512ER) | F(AVX512CD) | F(CLFLUSHOPT) | F(CLWB) | F(AVX512DQ) | | |
385 | F(SHA_NI) | F(AVX512BW) | F(AVX512VL); | |
00b27a3e | 386 | |
b65d6e17 | 387 | /* cpuid 0xD.1.eax */ |
e0b18ef7 | 388 | const u32 kvm_cpuid_D_1_eax_x86_features = |
55412b2e | 389 | F(XSAVEOPT) | F(XSAVEC) | F(XGETBV1) | f_xsaves; |
b65d6e17 | 390 | |
b9baba86 | 391 | /* cpuid 7.0.ecx*/ |
83781d18 | 392 | const u32 kvm_cpuid_7_0_ecx_x86_features = |
df9b1e03 | 393 | F(AVX512VBMI) | F(LA57) | F(PKU) | 0 /*OSPKE*/ | |
9ff2dedf YZ |
394 | F(AVX512_VPOPCNTDQ) | F(UMIP) | F(AVX512_VBMI2) | F(GFNI) | |
395 | F(VAES) | F(VPCLMULQDQ) | F(AVX512_VNNI) | F(AVX512_BITALG); | |
b9baba86 | 396 | |
4504b5c9 LK |
397 | /* cpuid 7.0.edx*/ |
398 | const u32 kvm_cpuid_7_0_edx_x86_features = | |
ce65486e | 399 | F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) | |
138de5e3 AK |
400 | F(SPEC_CTRL_SSBD) | F(ARCH_CAPABILITIES) | F(INTEL_STIBP) | |
401 | F(MD_CLEAR); | |
4504b5c9 | 402 | |
00b27a3e AK |
403 | /* all calls to cpuid_count() should be made on the same cpu */ |
404 | get_cpu(); | |
831bf664 SL |
405 | |
406 | r = -E2BIG; | |
407 | ||
408 | if (*nent >= maxnent) | |
409 | goto out; | |
410 | ||
00b27a3e AK |
411 | do_cpuid_1_ent(entry, function, index); |
412 | ++*nent; | |
413 | ||
414 | switch (function) { | |
415 | case 0: | |
416 | entry->eax = min(entry->eax, (u32)0xd); | |
417 | break; | |
418 | case 1: | |
e0b18ef7 HH |
419 | entry->edx &= kvm_cpuid_1_edx_x86_features; |
420 | cpuid_mask(&entry->edx, CPUID_1_EDX); | |
421 | entry->ecx &= kvm_cpuid_1_ecx_x86_features; | |
422 | cpuid_mask(&entry->ecx, CPUID_1_ECX); | |
00b27a3e AK |
423 | /* we support x2apic emulation even if host does not support |
424 | * it since we emulate x2apic in software */ | |
425 | entry->ecx |= F(X2APIC); | |
426 | break; | |
427 | /* function 2 entries are STATEFUL. That is, repeated cpuid commands | |
428 | * may return different values. This forces us to get_cpu() before | |
429 | * issuing the first command, and also to emulate this annoying behavior | |
430 | * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */ | |
431 | case 2: { | |
432 | int t, times = entry->eax & 0xff; | |
433 | ||
434 | entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; | |
435 | entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT; | |
831bf664 SL |
436 | for (t = 1; t < times; ++t) { |
437 | if (*nent >= maxnent) | |
438 | goto out; | |
439 | ||
00b27a3e AK |
440 | do_cpuid_1_ent(&entry[t], function, 0); |
441 | entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; | |
442 | ++*nent; | |
443 | } | |
444 | break; | |
445 | } | |
446 | /* function 4 has additional index. */ | |
447 | case 4: { | |
448 | int i, cache_type; | |
449 | ||
450 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
451 | /* read more entries until cache_type is zero */ | |
831bf664 SL |
452 | for (i = 1; ; ++i) { |
453 | if (*nent >= maxnent) | |
454 | goto out; | |
455 | ||
00b27a3e AK |
456 | cache_type = entry[i - 1].eax & 0x1f; |
457 | if (!cache_type) | |
458 | break; | |
459 | do_cpuid_1_ent(&entry[i], function, i); | |
460 | entry[i].flags |= | |
461 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
462 | ++*nent; | |
463 | } | |
464 | break; | |
465 | } | |
e453aa0f JK |
466 | case 6: /* Thermal management */ |
467 | entry->eax = 0x4; /* allow ARAT */ | |
468 | entry->ebx = 0; | |
469 | entry->ecx = 0; | |
470 | entry->edx = 0; | |
471 | break; | |
00b27a3e AK |
472 | case 7: { |
473 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
bbbda795 | 474 | /* Mask ebx against host capability word 9 */ |
00b27a3e | 475 | if (index == 0) { |
e0b18ef7 HH |
476 | entry->ebx &= kvm_cpuid_7_0_ebx_x86_features; |
477 | cpuid_mask(&entry->ebx, CPUID_7_0_EBX); | |
ba904635 WA |
478 | // TSC_ADJUST is emulated |
479 | entry->ebx |= F(TSC_ADJUST); | |
b9baba86 HH |
480 | entry->ecx &= kvm_cpuid_7_0_ecx_x86_features; |
481 | cpuid_mask(&entry->ecx, CPUID_7_ECX); | |
482 | /* PKU is not yet implemented for shadow paging. */ | |
c469268c | 483 | if (!tdp_enabled || !boot_cpu_has(X86_FEATURE_OSPKE)) |
b9baba86 | 484 | entry->ecx &= ~F(PKU); |
4504b5c9 | 485 | entry->edx &= kvm_cpuid_7_0_edx_x86_features; |
0fb3c779 | 486 | cpuid_mask(&entry->edx, CPUID_7_EDX); |
bea3e9fa JM |
487 | /* |
488 | * We emulate ARCH_CAPABILITIES in software even | |
489 | * if the host doesn't support it. | |
490 | */ | |
491 | entry->edx |= F(ARCH_CAPABILITIES); | |
b9baba86 | 492 | } else { |
00b27a3e | 493 | entry->ebx = 0; |
b9baba86 | 494 | entry->ecx = 0; |
4504b5c9 | 495 | entry->edx = 0; |
b9baba86 | 496 | } |
00b27a3e | 497 | entry->eax = 0; |
00b27a3e AK |
498 | break; |
499 | } | |
500 | case 9: | |
501 | break; | |
a6c06ed1 GN |
502 | case 0xa: { /* Architectural Performance Monitoring */ |
503 | struct x86_pmu_capability cap; | |
504 | union cpuid10_eax eax; | |
505 | union cpuid10_edx edx; | |
506 | ||
507 | perf_get_x86_pmu_capability(&cap); | |
508 | ||
509 | /* | |
510 | * Only support guest architectural pmu on a host | |
511 | * with architectural pmu. | |
512 | */ | |
513 | if (!cap.version) | |
514 | memset(&cap, 0, sizeof(cap)); | |
515 | ||
516 | eax.split.version_id = min(cap.version, 2); | |
517 | eax.split.num_counters = cap.num_counters_gp; | |
518 | eax.split.bit_width = cap.bit_width_gp; | |
519 | eax.split.mask_length = cap.events_mask_len; | |
520 | ||
521 | edx.split.num_counters_fixed = cap.num_counters_fixed; | |
522 | edx.split.bit_width_fixed = cap.bit_width_fixed; | |
523 | edx.split.reserved = 0; | |
524 | ||
525 | entry->eax = eax.full; | |
526 | entry->ebx = cap.events_mask; | |
527 | entry->ecx = 0; | |
528 | entry->edx = edx.full; | |
529 | break; | |
530 | } | |
00b27a3e AK |
531 | /* function 0xb has additional index. */ |
532 | case 0xb: { | |
533 | int i, level_type; | |
534 | ||
535 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
536 | /* read more entries until level_type is zero */ | |
831bf664 SL |
537 | for (i = 1; ; ++i) { |
538 | if (*nent >= maxnent) | |
539 | goto out; | |
540 | ||
00b27a3e AK |
541 | level_type = entry[i - 1].ecx & 0xff00; |
542 | if (!level_type) | |
543 | break; | |
544 | do_cpuid_1_ent(&entry[i], function, i); | |
545 | entry[i].flags |= | |
546 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
547 | ++*nent; | |
548 | } | |
549 | break; | |
550 | } | |
551 | case 0xd: { | |
552 | int idx, i; | |
4ff41732 | 553 | u64 supported = kvm_supported_xcr0(); |
00b27a3e | 554 | |
4ff41732 | 555 | entry->eax &= supported; |
e08e8336 RK |
556 | entry->ebx = xstate_required_size(supported, false); |
557 | entry->ecx = entry->ebx; | |
4ff41732 | 558 | entry->edx &= supported >> 32; |
00b27a3e | 559 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
b65d6e17 PB |
560 | if (!supported) |
561 | break; | |
562 | ||
831bf664 | 563 | for (idx = 1, i = 1; idx < 64; ++idx) { |
4ff41732 | 564 | u64 mask = ((u64)1 << idx); |
831bf664 SL |
565 | if (*nent >= maxnent) |
566 | goto out; | |
567 | ||
00b27a3e | 568 | do_cpuid_1_ent(&entry[i], function, idx); |
412a3c41 | 569 | if (idx == 1) { |
e0b18ef7 | 570 | entry[i].eax &= kvm_cpuid_D_1_eax_x86_features; |
316314ca | 571 | cpuid_mask(&entry[i].eax, CPUID_D_1_EAX); |
412a3c41 PB |
572 | entry[i].ebx = 0; |
573 | if (entry[i].eax & (F(XSAVES)|F(XSAVEC))) | |
574 | entry[i].ebx = | |
575 | xstate_required_size(supported, | |
576 | true); | |
404e0a19 PB |
577 | } else { |
578 | if (entry[i].eax == 0 || !(supported & mask)) | |
579 | continue; | |
580 | if (WARN_ON_ONCE(entry[i].ecx & 1)) | |
581 | continue; | |
582 | } | |
583 | entry[i].ecx = 0; | |
584 | entry[i].edx = 0; | |
00b27a3e AK |
585 | entry[i].flags |= |
586 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
587 | ++*nent; | |
588 | ++i; | |
589 | } | |
590 | break; | |
591 | } | |
592 | case KVM_CPUID_SIGNATURE: { | |
326d07cb MK |
593 | static const char signature[12] = "KVMKVMKVM\0\0"; |
594 | const u32 *sigptr = (const u32 *)signature; | |
57c22e5f | 595 | entry->eax = KVM_CPUID_FEATURES; |
00b27a3e AK |
596 | entry->ebx = sigptr[0]; |
597 | entry->ecx = sigptr[1]; | |
598 | entry->edx = sigptr[2]; | |
599 | break; | |
600 | } | |
601 | case KVM_CPUID_FEATURES: | |
602 | entry->eax = (1 << KVM_FEATURE_CLOCKSOURCE) | | |
603 | (1 << KVM_FEATURE_NOP_IO_DELAY) | | |
604 | (1 << KVM_FEATURE_CLOCKSOURCE2) | | |
605 | (1 << KVM_FEATURE_ASYNC_PF) | | |
ae7a2a3f | 606 | (1 << KVM_FEATURE_PV_EOI) | |
6aef266c | 607 | (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT) | |
e3d2ada7 RK |
608 | (1 << KVM_FEATURE_PV_UNHALT) | |
609 | (1 << KVM_FEATURE_ASYNC_PF_VMEXIT); | |
00b27a3e AK |
610 | |
611 | if (sched_info_on()) | |
612 | entry->eax |= (1 << KVM_FEATURE_STEAL_TIME); | |
613 | ||
614 | entry->ebx = 0; | |
615 | entry->ecx = 0; | |
616 | entry->edx = 0; | |
617 | break; | |
618 | case 0x80000000: | |
619 | entry->eax = min(entry->eax, 0x8000001a); | |
620 | break; | |
621 | case 0x80000001: | |
e0b18ef7 HH |
622 | entry->edx &= kvm_cpuid_8000_0001_edx_x86_features; |
623 | cpuid_mask(&entry->edx, CPUID_8000_0001_EDX); | |
624 | entry->ecx &= kvm_cpuid_8000_0001_ecx_x86_features; | |
625 | cpuid_mask(&entry->ecx, CPUID_8000_0001_ECX); | |
00b27a3e | 626 | break; |
e4c9a5a1 MT |
627 | case 0x80000007: /* Advanced power management */ |
628 | /* invariant TSC is CPUID.80000007H:EDX[8] */ | |
629 | entry->edx &= (1 << 8); | |
630 | /* mask against host */ | |
631 | entry->edx &= boot_cpu_data.x86_power; | |
632 | entry->eax = entry->ebx = entry->ecx = 0; | |
633 | break; | |
00b27a3e AK |
634 | case 0x80000008: { |
635 | unsigned g_phys_as = (entry->eax >> 16) & 0xff; | |
636 | unsigned virt_as = max((entry->eax >> 8) & 0xff, 48U); | |
637 | unsigned phys_as = entry->eax & 0xff; | |
638 | ||
639 | if (!g_phys_as) | |
640 | g_phys_as = phys_as; | |
641 | entry->eax = g_phys_as | (virt_as << 8); | |
33241bfe | 642 | entry->edx = 0; |
4d5c8a07 TL |
643 | /* |
644 | * IBRS, IBPB and VIRT_SSBD aren't necessarily present in | |
645 | * hardware cpuid | |
646 | */ | |
5856293c BP |
647 | if (boot_cpu_has(X86_FEATURE_AMD_IBPB)) |
648 | entry->ebx |= F(AMD_IBPB); | |
649 | if (boot_cpu_has(X86_FEATURE_AMD_IBRS)) | |
650 | entry->ebx |= F(AMD_IBRS); | |
4d5c8a07 TL |
651 | if (boot_cpu_has(X86_FEATURE_VIRT_SSBD)) |
652 | entry->ebx |= F(VIRT_SSBD); | |
33241bfe AR |
653 | entry->ebx &= kvm_cpuid_8000_0008_ebx_x86_features; |
654 | cpuid_mask(&entry->ebx, CPUID_8000_0008_EBX); | |
3b881627 KRW |
655 | /* |
656 | * The preference is to use SPEC CTRL MSR instead of the | |
657 | * VIRT_SPEC MSR. | |
658 | */ | |
659 | if (boot_cpu_has(X86_FEATURE_LS_CFG_SSBD) && | |
660 | !boot_cpu_has(X86_FEATURE_AMD_SSBD)) | |
4d5c8a07 | 661 | entry->ebx |= F(VIRT_SSBD); |
00b27a3e AK |
662 | break; |
663 | } | |
664 | case 0x80000019: | |
665 | entry->ecx = entry->edx = 0; | |
666 | break; | |
667 | case 0x8000001a: | |
668 | break; | |
669 | case 0x8000001d: | |
670 | break; | |
671 | /*Add support for Centaur's CPUID instruction*/ | |
672 | case 0xC0000000: | |
673 | /*Just support up to 0xC0000004 now*/ | |
674 | entry->eax = min(entry->eax, 0xC0000004); | |
675 | break; | |
676 | case 0xC0000001: | |
e0b18ef7 HH |
677 | entry->edx &= kvm_cpuid_C000_0001_edx_x86_features; |
678 | cpuid_mask(&entry->edx, CPUID_C000_0001_EDX); | |
00b27a3e AK |
679 | break; |
680 | case 3: /* Processor serial number */ | |
681 | case 5: /* MONITOR/MWAIT */ | |
00b27a3e AK |
682 | case 0xC0000002: |
683 | case 0xC0000003: | |
684 | case 0xC0000004: | |
685 | default: | |
686 | entry->eax = entry->ebx = entry->ecx = entry->edx = 0; | |
687 | break; | |
688 | } | |
689 | ||
690 | kvm_x86_ops->set_supported_cpuid(function, entry); | |
691 | ||
831bf664 SL |
692 | r = 0; |
693 | ||
694 | out: | |
00b27a3e | 695 | put_cpu(); |
831bf664 SL |
696 | |
697 | return r; | |
00b27a3e AK |
698 | } |
699 | ||
9c15bb1d BP |
700 | static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 func, |
701 | u32 idx, int *nent, int maxnent, unsigned int type) | |
702 | { | |
703 | if (type == KVM_GET_EMULATED_CPUID) | |
704 | return __do_cpuid_ent_emulated(entry, func, idx, nent, maxnent); | |
705 | ||
706 | return __do_cpuid_ent(entry, func, idx, nent, maxnent); | |
707 | } | |
708 | ||
00b27a3e AK |
709 | #undef F |
710 | ||
831bf664 SL |
711 | struct kvm_cpuid_param { |
712 | u32 func; | |
713 | u32 idx; | |
714 | bool has_leaf_count; | |
326d07cb | 715 | bool (*qualifier)(const struct kvm_cpuid_param *param); |
831bf664 SL |
716 | }; |
717 | ||
326d07cb | 718 | static bool is_centaur_cpu(const struct kvm_cpuid_param *param) |
831bf664 SL |
719 | { |
720 | return boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR; | |
721 | } | |
722 | ||
9c15bb1d BP |
723 | static bool sanity_check_entries(struct kvm_cpuid_entry2 __user *entries, |
724 | __u32 num_entries, unsigned int ioctl_type) | |
725 | { | |
726 | int i; | |
1b2ca422 | 727 | __u32 pad[3]; |
9c15bb1d BP |
728 | |
729 | if (ioctl_type != KVM_GET_EMULATED_CPUID) | |
730 | return false; | |
731 | ||
732 | /* | |
733 | * We want to make sure that ->padding is being passed clean from | |
734 | * userspace in case we want to use it for something in the future. | |
735 | * | |
736 | * Sadly, this wasn't enforced for KVM_GET_SUPPORTED_CPUID and so we | |
737 | * have to give ourselves satisfied only with the emulated side. /me | |
738 | * sheds a tear. | |
739 | */ | |
740 | for (i = 0; i < num_entries; i++) { | |
1b2ca422 BP |
741 | if (copy_from_user(pad, entries[i].padding, sizeof(pad))) |
742 | return true; | |
743 | ||
744 | if (pad[0] || pad[1] || pad[2]) | |
9c15bb1d BP |
745 | return true; |
746 | } | |
747 | return false; | |
748 | } | |
749 | ||
750 | int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid, | |
751 | struct kvm_cpuid_entry2 __user *entries, | |
752 | unsigned int type) | |
00b27a3e AK |
753 | { |
754 | struct kvm_cpuid_entry2 *cpuid_entries; | |
831bf664 | 755 | int limit, nent = 0, r = -E2BIG, i; |
00b27a3e | 756 | u32 func; |
326d07cb | 757 | static const struct kvm_cpuid_param param[] = { |
831bf664 SL |
758 | { .func = 0, .has_leaf_count = true }, |
759 | { .func = 0x80000000, .has_leaf_count = true }, | |
760 | { .func = 0xC0000000, .qualifier = is_centaur_cpu, .has_leaf_count = true }, | |
761 | { .func = KVM_CPUID_SIGNATURE }, | |
762 | { .func = KVM_CPUID_FEATURES }, | |
763 | }; | |
00b27a3e AK |
764 | |
765 | if (cpuid->nent < 1) | |
766 | goto out; | |
767 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) | |
768 | cpuid->nent = KVM_MAX_CPUID_ENTRIES; | |
9c15bb1d BP |
769 | |
770 | if (sanity_check_entries(entries, cpuid->nent, type)) | |
771 | return -EINVAL; | |
772 | ||
00b27a3e | 773 | r = -ENOMEM; |
84cffe49 | 774 | cpuid_entries = vzalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent); |
00b27a3e AK |
775 | if (!cpuid_entries) |
776 | goto out; | |
777 | ||
831bf664 SL |
778 | r = 0; |
779 | for (i = 0; i < ARRAY_SIZE(param); i++) { | |
326d07cb | 780 | const struct kvm_cpuid_param *ent = ¶m[i]; |
00b27a3e | 781 | |
831bf664 SL |
782 | if (ent->qualifier && !ent->qualifier(ent)) |
783 | continue; | |
00b27a3e | 784 | |
831bf664 | 785 | r = do_cpuid_ent(&cpuid_entries[nent], ent->func, ent->idx, |
9c15bb1d | 786 | &nent, cpuid->nent, type); |
00b27a3e | 787 | |
831bf664 | 788 | if (r) |
00b27a3e AK |
789 | goto out_free; |
790 | ||
831bf664 SL |
791 | if (!ent->has_leaf_count) |
792 | continue; | |
793 | ||
00b27a3e | 794 | limit = cpuid_entries[nent - 1].eax; |
831bf664 SL |
795 | for (func = ent->func + 1; func <= limit && nent < cpuid->nent && r == 0; ++func) |
796 | r = do_cpuid_ent(&cpuid_entries[nent], func, ent->idx, | |
9c15bb1d | 797 | &nent, cpuid->nent, type); |
00b27a3e | 798 | |
831bf664 | 799 | if (r) |
00b27a3e AK |
800 | goto out_free; |
801 | } | |
802 | ||
00b27a3e AK |
803 | r = -EFAULT; |
804 | if (copy_to_user(entries, cpuid_entries, | |
805 | nent * sizeof(struct kvm_cpuid_entry2))) | |
806 | goto out_free; | |
807 | cpuid->nent = nent; | |
808 | r = 0; | |
809 | ||
810 | out_free: | |
811 | vfree(cpuid_entries); | |
812 | out: | |
813 | return r; | |
814 | } | |
815 | ||
816 | static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i) | |
817 | { | |
818 | struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i]; | |
a3641631 WL |
819 | struct kvm_cpuid_entry2 *ej; |
820 | int j = i; | |
821 | int nent = vcpu->arch.cpuid_nent; | |
00b27a3e AK |
822 | |
823 | e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT; | |
824 | /* when no next entry is found, the current entry[i] is reselected */ | |
a3641631 WL |
825 | do { |
826 | j = (j + 1) % nent; | |
827 | ej = &vcpu->arch.cpuid_entries[j]; | |
828 | } while (ej->function != e->function); | |
829 | ||
830 | ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT; | |
831 | ||
832 | return j; | |
00b27a3e AK |
833 | } |
834 | ||
835 | /* find an entry with matching function, matching index (if needed), and that | |
836 | * should be read next (if it's stateful) */ | |
837 | static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e, | |
838 | u32 function, u32 index) | |
839 | { | |
840 | if (e->function != function) | |
841 | return 0; | |
842 | if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index) | |
843 | return 0; | |
844 | if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) && | |
845 | !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT)) | |
846 | return 0; | |
847 | return 1; | |
848 | } | |
849 | ||
850 | struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu, | |
851 | u32 function, u32 index) | |
852 | { | |
853 | int i; | |
854 | struct kvm_cpuid_entry2 *best = NULL; | |
855 | ||
856 | for (i = 0; i < vcpu->arch.cpuid_nent; ++i) { | |
857 | struct kvm_cpuid_entry2 *e; | |
858 | ||
859 | e = &vcpu->arch.cpuid_entries[i]; | |
860 | if (is_matching_cpuid_entry(e, function, index)) { | |
861 | if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) | |
862 | move_to_next_stateful_cpuid_entry(vcpu, i); | |
863 | best = e; | |
864 | break; | |
865 | } | |
866 | } | |
867 | return best; | |
868 | } | |
869 | EXPORT_SYMBOL_GPL(kvm_find_cpuid_entry); | |
870 | ||
00b27a3e AK |
871 | /* |
872 | * If no match is found, check whether we exceed the vCPU's limit | |
873 | * and return the content of the highest valid _standard_ leaf instead. | |
874 | * This is to satisfy the CPUID specification. | |
875 | */ | |
876 | static struct kvm_cpuid_entry2* check_cpuid_limit(struct kvm_vcpu *vcpu, | |
877 | u32 function, u32 index) | |
878 | { | |
879 | struct kvm_cpuid_entry2 *maxlevel; | |
880 | ||
881 | maxlevel = kvm_find_cpuid_entry(vcpu, function & 0x80000000, 0); | |
882 | if (!maxlevel || maxlevel->eax >= function) | |
883 | return NULL; | |
884 | if (function & 0x80000000) { | |
885 | maxlevel = kvm_find_cpuid_entry(vcpu, 0, 0); | |
886 | if (!maxlevel) | |
887 | return NULL; | |
888 | } | |
889 | return kvm_find_cpuid_entry(vcpu, maxlevel->eax, index); | |
890 | } | |
891 | ||
e911eb3b YZ |
892 | bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx, |
893 | u32 *ecx, u32 *edx, bool check_limit) | |
00b27a3e | 894 | { |
62046e5a | 895 | u32 function = *eax, index = *ecx; |
00b27a3e | 896 | struct kvm_cpuid_entry2 *best; |
e911eb3b | 897 | bool entry_found = true; |
00b27a3e | 898 | |
00b27a3e AK |
899 | best = kvm_find_cpuid_entry(vcpu, function, index); |
900 | ||
e911eb3b YZ |
901 | if (!best) { |
902 | entry_found = false; | |
903 | if (!check_limit) | |
904 | goto out; | |
905 | ||
00b27a3e | 906 | best = check_cpuid_limit(vcpu, function, index); |
e911eb3b | 907 | } |
00b27a3e | 908 | |
e911eb3b | 909 | out: |
00b27a3e | 910 | if (best) { |
62046e5a AK |
911 | *eax = best->eax; |
912 | *ebx = best->ebx; | |
913 | *ecx = best->ecx; | |
914 | *edx = best->edx; | |
915 | } else | |
916 | *eax = *ebx = *ecx = *edx = 0; | |
e911eb3b YZ |
917 | trace_kvm_cpuid(function, *eax, *ebx, *ecx, *edx, entry_found); |
918 | return entry_found; | |
62046e5a | 919 | } |
66f7b72e | 920 | EXPORT_SYMBOL_GPL(kvm_cpuid); |
62046e5a | 921 | |
6a908b62 | 922 | int kvm_emulate_cpuid(struct kvm_vcpu *vcpu) |
62046e5a | 923 | { |
1e13175b | 924 | u32 eax, ebx, ecx, edx; |
62046e5a | 925 | |
db2336a8 KH |
926 | if (cpuid_fault_enabled(vcpu) && !kvm_require_cpl(vcpu, 0)) |
927 | return 1; | |
928 | ||
1e13175b | 929 | eax = kvm_register_read(vcpu, VCPU_REGS_RAX); |
62046e5a | 930 | ecx = kvm_register_read(vcpu, VCPU_REGS_RCX); |
e911eb3b | 931 | kvm_cpuid(vcpu, &eax, &ebx, &ecx, &edx, true); |
62046e5a AK |
932 | kvm_register_write(vcpu, VCPU_REGS_RAX, eax); |
933 | kvm_register_write(vcpu, VCPU_REGS_RBX, ebx); | |
934 | kvm_register_write(vcpu, VCPU_REGS_RCX, ecx); | |
935 | kvm_register_write(vcpu, VCPU_REGS_RDX, edx); | |
6affcbed | 936 | return kvm_skip_emulated_instruction(vcpu); |
00b27a3e AK |
937 | } |
938 | EXPORT_SYMBOL_GPL(kvm_emulate_cpuid); |