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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 | ||
dd598091 | 70 | int kvm_update_cpuid(struct kvm_vcpu *vcpu) |
00b27a3e AK |
71 | { |
72 | struct kvm_cpuid_entry2 *best; | |
73 | struct kvm_lapic *apic = vcpu->arch.apic; | |
74 | ||
75 | best = kvm_find_cpuid_entry(vcpu, 1, 0); | |
76 | if (!best) | |
dd598091 | 77 | return 0; |
00b27a3e AK |
78 | |
79 | /* Update OSXSAVE bit */ | |
d366bf7e | 80 | if (boot_cpu_has(X86_FEATURE_XSAVE) && best->function == 0x1) { |
5c404cab | 81 | best->ecx &= ~F(OSXSAVE); |
00b27a3e | 82 | if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE)) |
5c404cab | 83 | best->ecx |= F(OSXSAVE); |
00b27a3e AK |
84 | } |
85 | ||
c7dd15b3 JM |
86 | best->edx &= ~F(APIC); |
87 | if (vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE) | |
88 | best->edx |= F(APIC); | |
89 | ||
00b27a3e | 90 | if (apic) { |
5c404cab | 91 | if (best->ecx & F(TSC_DEADLINE_TIMER)) |
00b27a3e AK |
92 | apic->lapic_timer.timer_mode_mask = 3 << 17; |
93 | else | |
94 | apic->lapic_timer.timer_mode_mask = 1 << 17; | |
95 | } | |
f5132b01 | 96 | |
b9baba86 HH |
97 | best = kvm_find_cpuid_entry(vcpu, 7, 0); |
98 | if (best) { | |
99 | /* Update OSPKE bit */ | |
100 | if (boot_cpu_has(X86_FEATURE_PKU) && best->function == 0x7) { | |
101 | best->ecx &= ~F(OSPKE); | |
102 | if (kvm_read_cr4_bits(vcpu, X86_CR4_PKE)) | |
103 | best->ecx |= F(OSPKE); | |
104 | } | |
105 | } | |
106 | ||
d7876f1b | 107 | best = kvm_find_cpuid_entry(vcpu, 0xD, 0); |
4344ee98 | 108 | if (!best) { |
d7876f1b | 109 | vcpu->arch.guest_supported_xcr0 = 0; |
4344ee98 PB |
110 | vcpu->arch.guest_xstate_size = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET; |
111 | } else { | |
d7876f1b PB |
112 | vcpu->arch.guest_supported_xcr0 = |
113 | (best->eax | ((u64)best->edx << 32)) & | |
4ff41732 | 114 | kvm_supported_xcr0(); |
56c103ec | 115 | vcpu->arch.guest_xstate_size = best->ebx = |
412a3c41 | 116 | xstate_required_size(vcpu->arch.xcr0, false); |
4344ee98 | 117 | } |
d7876f1b | 118 | |
412a3c41 PB |
119 | best = kvm_find_cpuid_entry(vcpu, 0xD, 1); |
120 | if (best && (best->eax & (F(XSAVES) | F(XSAVEC)))) | |
121 | best->ebx = xstate_required_size(vcpu->arch.xcr0, true); | |
122 | ||
dd598091 | 123 | /* |
fd8cb433 YZ |
124 | * The existing code assumes virtual address is 48-bit or 57-bit in the |
125 | * canonical address checks; exit if it is ever changed. | |
dd598091 NA |
126 | */ |
127 | best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0); | |
fd8cb433 YZ |
128 | if (best) { |
129 | int vaddr_bits = (best->eax & 0xff00) >> 8; | |
130 | ||
131 | if (vaddr_bits != 48 && vaddr_bits != 57 && vaddr_bits != 0) | |
132 | return -EINVAL; | |
133 | } | |
dd598091 | 134 | |
caa057a2 WL |
135 | best = kvm_find_cpuid_entry(vcpu, KVM_CPUID_FEATURES, 0); |
136 | if (kvm_hlt_in_guest(vcpu->kvm) && best && | |
137 | (best->eax & (1 << KVM_FEATURE_PV_UNHALT))) | |
138 | best->eax &= ~(1 << KVM_FEATURE_PV_UNHALT); | |
139 | ||
5a4f55cd EK |
140 | /* Update physical-address width */ |
141 | vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu); | |
855feb67 | 142 | kvm_mmu_reset_context(vcpu); |
5a4f55cd | 143 | |
c6702c9d | 144 | kvm_pmu_refresh(vcpu); |
dd598091 | 145 | return 0; |
00b27a3e AK |
146 | } |
147 | ||
148 | static int is_efer_nx(void) | |
149 | { | |
150 | unsigned long long efer = 0; | |
151 | ||
152 | rdmsrl_safe(MSR_EFER, &efer); | |
153 | return efer & EFER_NX; | |
154 | } | |
155 | ||
156 | static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu) | |
157 | { | |
158 | int i; | |
159 | struct kvm_cpuid_entry2 *e, *entry; | |
160 | ||
161 | entry = NULL; | |
162 | for (i = 0; i < vcpu->arch.cpuid_nent; ++i) { | |
163 | e = &vcpu->arch.cpuid_entries[i]; | |
164 | if (e->function == 0x80000001) { | |
165 | entry = e; | |
166 | break; | |
167 | } | |
168 | } | |
5c404cab PB |
169 | if (entry && (entry->edx & F(NX)) && !is_efer_nx()) { |
170 | entry->edx &= ~F(NX); | |
00b27a3e AK |
171 | printk(KERN_INFO "kvm: guest NX capability removed\n"); |
172 | } | |
173 | } | |
174 | ||
5a4f55cd EK |
175 | int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu) |
176 | { | |
177 | struct kvm_cpuid_entry2 *best; | |
178 | ||
179 | best = kvm_find_cpuid_entry(vcpu, 0x80000000, 0); | |
180 | if (!best || best->eax < 0x80000008) | |
181 | goto not_found; | |
182 | best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0); | |
183 | if (best) | |
184 | return best->eax & 0xff; | |
185 | not_found: | |
186 | return 36; | |
187 | } | |
188 | EXPORT_SYMBOL_GPL(cpuid_query_maxphyaddr); | |
189 | ||
00b27a3e AK |
190 | /* when an old userspace process fills a new kernel module */ |
191 | int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu, | |
192 | struct kvm_cpuid *cpuid, | |
193 | struct kvm_cpuid_entry __user *entries) | |
194 | { | |
195 | int r, i; | |
83676e92 | 196 | struct kvm_cpuid_entry *cpuid_entries = NULL; |
00b27a3e AK |
197 | |
198 | r = -E2BIG; | |
199 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) | |
200 | goto out; | |
201 | r = -ENOMEM; | |
83676e92 | 202 | if (cpuid->nent) { |
42bc47b3 KC |
203 | cpuid_entries = |
204 | vmalloc(array_size(sizeof(struct kvm_cpuid_entry), | |
205 | cpuid->nent)); | |
83676e92 PB |
206 | if (!cpuid_entries) |
207 | goto out; | |
208 | r = -EFAULT; | |
209 | if (copy_from_user(cpuid_entries, entries, | |
210 | cpuid->nent * sizeof(struct kvm_cpuid_entry))) | |
211 | goto out; | |
212 | } | |
00b27a3e AK |
213 | for (i = 0; i < cpuid->nent; i++) { |
214 | vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function; | |
215 | vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax; | |
216 | vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx; | |
217 | vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx; | |
218 | vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx; | |
219 | vcpu->arch.cpuid_entries[i].index = 0; | |
220 | vcpu->arch.cpuid_entries[i].flags = 0; | |
221 | vcpu->arch.cpuid_entries[i].padding[0] = 0; | |
222 | vcpu->arch.cpuid_entries[i].padding[1] = 0; | |
223 | vcpu->arch.cpuid_entries[i].padding[2] = 0; | |
224 | } | |
225 | vcpu->arch.cpuid_nent = cpuid->nent; | |
226 | cpuid_fix_nx_cap(vcpu); | |
00b27a3e AK |
227 | kvm_apic_set_version(vcpu); |
228 | kvm_x86_ops->cpuid_update(vcpu); | |
dd598091 | 229 | r = kvm_update_cpuid(vcpu); |
00b27a3e | 230 | |
00b27a3e | 231 | out: |
83676e92 | 232 | vfree(cpuid_entries); |
00b27a3e AK |
233 | return r; |
234 | } | |
235 | ||
236 | int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu, | |
237 | struct kvm_cpuid2 *cpuid, | |
238 | struct kvm_cpuid_entry2 __user *entries) | |
239 | { | |
240 | int r; | |
241 | ||
242 | r = -E2BIG; | |
243 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) | |
244 | goto out; | |
245 | r = -EFAULT; | |
246 | if (copy_from_user(&vcpu->arch.cpuid_entries, entries, | |
247 | cpuid->nent * sizeof(struct kvm_cpuid_entry2))) | |
248 | goto out; | |
249 | vcpu->arch.cpuid_nent = cpuid->nent; | |
250 | kvm_apic_set_version(vcpu); | |
251 | kvm_x86_ops->cpuid_update(vcpu); | |
dd598091 | 252 | r = kvm_update_cpuid(vcpu); |
00b27a3e AK |
253 | out: |
254 | return r; | |
255 | } | |
256 | ||
257 | int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu, | |
258 | struct kvm_cpuid2 *cpuid, | |
259 | struct kvm_cpuid_entry2 __user *entries) | |
260 | { | |
261 | int r; | |
262 | ||
263 | r = -E2BIG; | |
264 | if (cpuid->nent < vcpu->arch.cpuid_nent) | |
265 | goto out; | |
266 | r = -EFAULT; | |
267 | if (copy_to_user(entries, &vcpu->arch.cpuid_entries, | |
268 | vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2))) | |
269 | goto out; | |
270 | return 0; | |
271 | ||
272 | out: | |
273 | cpuid->nent = vcpu->arch.cpuid_nent; | |
274 | return r; | |
275 | } | |
276 | ||
277 | static void cpuid_mask(u32 *word, int wordnum) | |
278 | { | |
279 | *word &= boot_cpu_data.x86_capability[wordnum]; | |
280 | } | |
281 | ||
282 | static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function, | |
283 | u32 index) | |
284 | { | |
285 | entry->function = function; | |
286 | entry->index = index; | |
287 | cpuid_count(entry->function, entry->index, | |
288 | &entry->eax, &entry->ebx, &entry->ecx, &entry->edx); | |
289 | entry->flags = 0; | |
290 | } | |
291 | ||
9c15bb1d BP |
292 | static int __do_cpuid_ent_emulated(struct kvm_cpuid_entry2 *entry, |
293 | u32 func, u32 index, int *nent, int maxnent) | |
294 | { | |
84cffe49 BP |
295 | switch (func) { |
296 | case 0: | |
fb6d4d34 | 297 | entry->eax = 7; |
84cffe49 BP |
298 | ++*nent; |
299 | break; | |
300 | case 1: | |
301 | entry->ecx = F(MOVBE); | |
302 | ++*nent; | |
303 | break; | |
fb6d4d34 PB |
304 | case 7: |
305 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
306 | if (index == 0) | |
307 | entry->ecx = F(RDPID); | |
308 | ++*nent; | |
84cffe49 BP |
309 | default: |
310 | break; | |
311 | } | |
312 | ||
313 | entry->function = func; | |
314 | entry->index = index; | |
315 | ||
9c15bb1d BP |
316 | return 0; |
317 | } | |
318 | ||
319 | static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, | |
320 | u32 index, int *nent, int maxnent) | |
00b27a3e | 321 | { |
831bf664 | 322 | int r; |
00b27a3e AK |
323 | unsigned f_nx = is_efer_nx() ? F(NX) : 0; |
324 | #ifdef CONFIG_X86_64 | |
325 | unsigned f_gbpages = (kvm_x86_ops->get_lpage_level() == PT_PDPE_LEVEL) | |
326 | ? F(GBPAGES) : 0; | |
327 | unsigned f_lm = F(LM); | |
328 | #else | |
329 | unsigned f_gbpages = 0; | |
330 | unsigned f_lm = 0; | |
331 | #endif | |
332 | unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0; | |
ad756a16 | 333 | unsigned f_invpcid = kvm_x86_ops->invpcid_supported() ? F(INVPCID) : 0; |
a87036ad | 334 | unsigned f_mpx = kvm_mpx_supported() ? F(MPX) : 0; |
55412b2e | 335 | unsigned f_xsaves = kvm_x86_ops->xsaves_supported() ? F(XSAVES) : 0; |
66336cab | 336 | unsigned f_umip = kvm_x86_ops->umip_emulated() ? F(UMIP) : 0; |
86f5201d | 337 | unsigned f_intel_pt = kvm_x86_ops->pt_supported() ? F(INTEL_PT) : 0; |
511da98d | 338 | unsigned f_la57 = 0; |
00b27a3e AK |
339 | |
340 | /* cpuid 1.edx */ | |
e0b18ef7 | 341 | const u32 kvm_cpuid_1_edx_x86_features = |
00b27a3e AK |
342 | F(FPU) | F(VME) | F(DE) | F(PSE) | |
343 | F(TSC) | F(MSR) | F(PAE) | F(MCE) | | |
344 | F(CX8) | F(APIC) | 0 /* Reserved */ | F(SEP) | | |
345 | F(MTRR) | F(PGE) | F(MCA) | F(CMOV) | | |
840d2830 | 346 | F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLUSH) | |
00b27a3e AK |
347 | 0 /* Reserved, DS, ACPI */ | F(MMX) | |
348 | F(FXSR) | F(XMM) | F(XMM2) | F(SELFSNOOP) | | |
349 | 0 /* HTT, TM, Reserved, PBE */; | |
350 | /* cpuid 0x80000001.edx */ | |
e0b18ef7 | 351 | const u32 kvm_cpuid_8000_0001_edx_x86_features = |
00b27a3e AK |
352 | F(FPU) | F(VME) | F(DE) | F(PSE) | |
353 | F(TSC) | F(MSR) | F(PAE) | F(MCE) | | |
354 | F(CX8) | F(APIC) | 0 /* Reserved */ | F(SYSCALL) | | |
355 | F(MTRR) | F(PGE) | F(MCA) | F(CMOV) | | |
356 | F(PAT) | F(PSE36) | 0 /* Reserved */ | | |
357 | f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) | | |
358 | F(FXSR) | F(FXSR_OPT) | f_gbpages | f_rdtscp | | |
359 | 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW); | |
360 | /* cpuid 1.ecx */ | |
e0b18ef7 | 361 | const u32 kvm_cpuid_1_ecx_x86_features = |
87c00572 GS |
362 | /* NOTE: MONITOR (and MWAIT) are emulated as NOP, |
363 | * but *not* advertised to guests via CPUID ! */ | |
00b27a3e AK |
364 | F(XMM3) | F(PCLMULQDQ) | 0 /* DTES64, MONITOR */ | |
365 | 0 /* DS-CPL, VMX, SMX, EST */ | | |
366 | 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ | | |
fb215366 | 367 | F(FMA) | F(CX16) | 0 /* xTPR Update, PDCM */ | |
ad756a16 | 368 | F(PCID) | 0 /* Reserved, DCA */ | F(XMM4_1) | |
00b27a3e AK |
369 | F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) | |
370 | 0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) | | |
371 | F(F16C) | F(RDRAND); | |
372 | /* cpuid 0x80000001.ecx */ | |
e0b18ef7 | 373 | const u32 kvm_cpuid_8000_0001_ecx_x86_features = |
00b27a3e AK |
374 | F(LAHF_LM) | F(CMP_LEGACY) | 0 /*SVM*/ | 0 /* ExtApicSpace */ | |
375 | F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) | | |
2b036c6b | 376 | F(3DNOWPREFETCH) | F(OSVW) | 0 /* IBS */ | F(XOP) | |
806793f5 | 377 | 0 /* SKINIT, WDT, LWP */ | F(FMA4) | F(TBM) | |
c51eb52b | 378 | F(TOPOEXT) | F(PERFCTR_CORE); |
00b27a3e | 379 | |
15d45071 AR |
380 | /* cpuid 0x80000008.ebx */ |
381 | const u32 kvm_cpuid_8000_0008_ebx_x86_features = | |
a0aea130 | 382 | F(WBNOINVD) | F(AMD_IBPB) | F(AMD_IBRS) | F(AMD_SSBD) | F(VIRT_SSBD) | |
d7b09c82 | 383 | F(AMD_SSB_NO) | F(AMD_STIBP); |
15d45071 | 384 | |
00b27a3e | 385 | /* cpuid 0xC0000001.edx */ |
e0b18ef7 | 386 | const u32 kvm_cpuid_C000_0001_edx_x86_features = |
00b27a3e AK |
387 | F(XSTORE) | F(XSTORE_EN) | F(XCRYPT) | F(XCRYPT_EN) | |
388 | F(ACE2) | F(ACE2_EN) | F(PHE) | F(PHE_EN) | | |
389 | F(PMM) | F(PMM_EN); | |
390 | ||
391 | /* cpuid 7.0.ebx */ | |
e0b18ef7 | 392 | const u32 kvm_cpuid_7_0_ebx_x86_features = |
83c52915 | 393 | F(FSGSBASE) | F(BMI1) | F(HLE) | F(AVX2) | F(SMEP) | |
390bd528 | 394 | F(BMI2) | F(ERMS) | f_invpcid | F(RTM) | f_mpx | F(RDSEED) | |
83781d18 YS |
395 | F(ADX) | F(SMAP) | F(AVX512IFMA) | F(AVX512F) | F(AVX512PF) | |
396 | F(AVX512ER) | F(AVX512CD) | F(CLFLUSHOPT) | F(CLWB) | F(AVX512DQ) | | |
86f5201d | 397 | F(SHA_NI) | F(AVX512BW) | F(AVX512VL) | f_intel_pt; |
00b27a3e | 398 | |
b65d6e17 | 399 | /* cpuid 0xD.1.eax */ |
e0b18ef7 | 400 | const u32 kvm_cpuid_D_1_eax_x86_features = |
55412b2e | 401 | F(XSAVEOPT) | F(XSAVEC) | F(XGETBV1) | f_xsaves; |
b65d6e17 | 402 | |
b9baba86 | 403 | /* cpuid 7.0.ecx*/ |
83781d18 | 404 | const u32 kvm_cpuid_7_0_ecx_x86_features = |
ae3e61e1 | 405 | F(AVX512VBMI) | F(LA57) | F(PKU) | 0 /*OSPKE*/ | |
80fef315 | 406 | F(AVX512_VPOPCNTDQ) | F(UMIP) | F(AVX512_VBMI2) | F(GFNI) | |
0ea3286e | 407 | F(VAES) | F(VPCLMULQDQ) | F(AVX512_VNNI) | F(AVX512_BITALG) | |
c029b5de | 408 | F(CLDEMOTE) | F(MOVDIRI) | F(MOVDIR64B); |
b9baba86 | 409 | |
4504b5c9 LK |
410 | /* cpuid 7.0.edx*/ |
411 | const u32 kvm_cpuid_7_0_edx_x86_features = | |
0aa48468 | 412 | F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) | |
6c4dbbd1 AK |
413 | F(SPEC_CTRL_SSBD) | F(ARCH_CAPABILITIES) | F(INTEL_STIBP) | |
414 | F(MD_CLEAR); | |
4504b5c9 | 415 | |
00b27a3e AK |
416 | /* all calls to cpuid_count() should be made on the same cpu */ |
417 | get_cpu(); | |
831bf664 SL |
418 | |
419 | r = -E2BIG; | |
420 | ||
421 | if (*nent >= maxnent) | |
422 | goto out; | |
423 | ||
00b27a3e AK |
424 | do_cpuid_1_ent(entry, function, index); |
425 | ++*nent; | |
426 | ||
427 | switch (function) { | |
428 | case 0: | |
86f5201d | 429 | entry->eax = min(entry->eax, (u32)(f_intel_pt ? 0x14 : 0xd)); |
00b27a3e AK |
430 | break; |
431 | case 1: | |
e0b18ef7 HH |
432 | entry->edx &= kvm_cpuid_1_edx_x86_features; |
433 | cpuid_mask(&entry->edx, CPUID_1_EDX); | |
434 | entry->ecx &= kvm_cpuid_1_ecx_x86_features; | |
435 | cpuid_mask(&entry->ecx, CPUID_1_ECX); | |
00b27a3e AK |
436 | /* we support x2apic emulation even if host does not support |
437 | * it since we emulate x2apic in software */ | |
438 | entry->ecx |= F(X2APIC); | |
439 | break; | |
440 | /* function 2 entries are STATEFUL. That is, repeated cpuid commands | |
441 | * may return different values. This forces us to get_cpu() before | |
442 | * issuing the first command, and also to emulate this annoying behavior | |
443 | * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */ | |
444 | case 2: { | |
445 | int t, times = entry->eax & 0xff; | |
446 | ||
447 | entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; | |
448 | entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT; | |
831bf664 SL |
449 | for (t = 1; t < times; ++t) { |
450 | if (*nent >= maxnent) | |
451 | goto out; | |
452 | ||
00b27a3e AK |
453 | do_cpuid_1_ent(&entry[t], function, 0); |
454 | entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; | |
455 | ++*nent; | |
456 | } | |
457 | break; | |
458 | } | |
32a243df JM |
459 | /* functions 4 and 0x8000001d have additional index. */ |
460 | case 4: | |
461 | case 0x8000001d: { | |
00b27a3e AK |
462 | int i, cache_type; |
463 | ||
464 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
465 | /* read more entries until cache_type is zero */ | |
831bf664 SL |
466 | for (i = 1; ; ++i) { |
467 | if (*nent >= maxnent) | |
468 | goto out; | |
469 | ||
00b27a3e AK |
470 | cache_type = entry[i - 1].eax & 0x1f; |
471 | if (!cache_type) | |
472 | break; | |
473 | do_cpuid_1_ent(&entry[i], function, i); | |
474 | entry[i].flags |= | |
475 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
476 | ++*nent; | |
477 | } | |
478 | break; | |
479 | } | |
e453aa0f JK |
480 | case 6: /* Thermal management */ |
481 | entry->eax = 0x4; /* allow ARAT */ | |
482 | entry->ebx = 0; | |
483 | entry->ecx = 0; | |
484 | entry->edx = 0; | |
485 | break; | |
00b27a3e AK |
486 | case 7: { |
487 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
bbbda795 | 488 | /* Mask ebx against host capability word 9 */ |
00b27a3e | 489 | if (index == 0) { |
e0b18ef7 HH |
490 | entry->ebx &= kvm_cpuid_7_0_ebx_x86_features; |
491 | cpuid_mask(&entry->ebx, CPUID_7_0_EBX); | |
ba904635 WA |
492 | // TSC_ADJUST is emulated |
493 | entry->ebx |= F(TSC_ADJUST); | |
b9baba86 | 494 | entry->ecx &= kvm_cpuid_7_0_ecx_x86_features; |
511da98d | 495 | f_la57 = entry->ecx & F(LA57); |
b9baba86 | 496 | cpuid_mask(&entry->ecx, CPUID_7_ECX); |
511da98d YZ |
497 | /* Set LA57 based on hardware capability. */ |
498 | entry->ecx |= f_la57; | |
66336cab | 499 | entry->ecx |= f_umip; |
b9baba86 | 500 | /* PKU is not yet implemented for shadow paging. */ |
c469268c | 501 | if (!tdp_enabled || !boot_cpu_has(X86_FEATURE_OSPKE)) |
b9baba86 | 502 | entry->ecx &= ~F(PKU); |
4504b5c9 | 503 | entry->edx &= kvm_cpuid_7_0_edx_x86_features; |
b7b27aa0 | 504 | cpuid_mask(&entry->edx, CPUID_7_EDX); |
1eaafe91 JM |
505 | /* |
506 | * We emulate ARCH_CAPABILITIES in software even | |
507 | * if the host doesn't support it. | |
508 | */ | |
509 | entry->edx |= F(ARCH_CAPABILITIES); | |
b9baba86 | 510 | } else { |
00b27a3e | 511 | entry->ebx = 0; |
b9baba86 | 512 | entry->ecx = 0; |
4504b5c9 | 513 | entry->edx = 0; |
b9baba86 | 514 | } |
00b27a3e | 515 | entry->eax = 0; |
00b27a3e AK |
516 | break; |
517 | } | |
518 | case 9: | |
519 | break; | |
a6c06ed1 GN |
520 | case 0xa: { /* Architectural Performance Monitoring */ |
521 | struct x86_pmu_capability cap; | |
522 | union cpuid10_eax eax; | |
523 | union cpuid10_edx edx; | |
524 | ||
525 | perf_get_x86_pmu_capability(&cap); | |
526 | ||
527 | /* | |
528 | * Only support guest architectural pmu on a host | |
529 | * with architectural pmu. | |
530 | */ | |
531 | if (!cap.version) | |
532 | memset(&cap, 0, sizeof(cap)); | |
533 | ||
534 | eax.split.version_id = min(cap.version, 2); | |
535 | eax.split.num_counters = cap.num_counters_gp; | |
536 | eax.split.bit_width = cap.bit_width_gp; | |
537 | eax.split.mask_length = cap.events_mask_len; | |
538 | ||
539 | edx.split.num_counters_fixed = cap.num_counters_fixed; | |
540 | edx.split.bit_width_fixed = cap.bit_width_fixed; | |
541 | edx.split.reserved = 0; | |
542 | ||
543 | entry->eax = eax.full; | |
544 | entry->ebx = cap.events_mask; | |
545 | entry->ecx = 0; | |
546 | entry->edx = edx.full; | |
547 | break; | |
548 | } | |
00b27a3e AK |
549 | /* function 0xb has additional index. */ |
550 | case 0xb: { | |
551 | int i, level_type; | |
552 | ||
553 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
554 | /* read more entries until level_type is zero */ | |
831bf664 SL |
555 | for (i = 1; ; ++i) { |
556 | if (*nent >= maxnent) | |
557 | goto out; | |
558 | ||
00b27a3e AK |
559 | level_type = entry[i - 1].ecx & 0xff00; |
560 | if (!level_type) | |
561 | break; | |
562 | do_cpuid_1_ent(&entry[i], function, i); | |
563 | entry[i].flags |= | |
564 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
565 | ++*nent; | |
566 | } | |
567 | break; | |
568 | } | |
569 | case 0xd: { | |
570 | int idx, i; | |
4ff41732 | 571 | u64 supported = kvm_supported_xcr0(); |
00b27a3e | 572 | |
4ff41732 | 573 | entry->eax &= supported; |
e08e8336 RK |
574 | entry->ebx = xstate_required_size(supported, false); |
575 | entry->ecx = entry->ebx; | |
4ff41732 | 576 | entry->edx &= supported >> 32; |
00b27a3e | 577 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
b65d6e17 PB |
578 | if (!supported) |
579 | break; | |
580 | ||
831bf664 | 581 | for (idx = 1, i = 1; idx < 64; ++idx) { |
4ff41732 | 582 | u64 mask = ((u64)1 << idx); |
831bf664 SL |
583 | if (*nent >= maxnent) |
584 | goto out; | |
585 | ||
00b27a3e | 586 | do_cpuid_1_ent(&entry[i], function, idx); |
412a3c41 | 587 | if (idx == 1) { |
e0b18ef7 | 588 | entry[i].eax &= kvm_cpuid_D_1_eax_x86_features; |
316314ca | 589 | cpuid_mask(&entry[i].eax, CPUID_D_1_EAX); |
412a3c41 PB |
590 | entry[i].ebx = 0; |
591 | if (entry[i].eax & (F(XSAVES)|F(XSAVEC))) | |
592 | entry[i].ebx = | |
593 | xstate_required_size(supported, | |
594 | true); | |
404e0a19 PB |
595 | } else { |
596 | if (entry[i].eax == 0 || !(supported & mask)) | |
597 | continue; | |
598 | if (WARN_ON_ONCE(entry[i].ecx & 1)) | |
599 | continue; | |
600 | } | |
601 | entry[i].ecx = 0; | |
602 | entry[i].edx = 0; | |
00b27a3e AK |
603 | entry[i].flags |= |
604 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
605 | ++*nent; | |
606 | ++i; | |
607 | } | |
608 | break; | |
86f5201d CP |
609 | } |
610 | /* Intel PT */ | |
611 | case 0x14: { | |
612 | int t, times = entry->eax; | |
613 | ||
614 | if (!f_intel_pt) | |
615 | break; | |
616 | ||
617 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
618 | for (t = 1; t <= times; ++t) { | |
619 | if (*nent >= maxnent) | |
620 | goto out; | |
621 | do_cpuid_1_ent(&entry[t], function, t); | |
622 | entry[t].flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
623 | ++*nent; | |
624 | } | |
625 | break; | |
00b27a3e AK |
626 | } |
627 | case KVM_CPUID_SIGNATURE: { | |
326d07cb MK |
628 | static const char signature[12] = "KVMKVMKVM\0\0"; |
629 | const u32 *sigptr = (const u32 *)signature; | |
57c22e5f | 630 | entry->eax = KVM_CPUID_FEATURES; |
00b27a3e AK |
631 | entry->ebx = sigptr[0]; |
632 | entry->ecx = sigptr[1]; | |
633 | entry->edx = sigptr[2]; | |
634 | break; | |
635 | } | |
636 | case KVM_CPUID_FEATURES: | |
637 | entry->eax = (1 << KVM_FEATURE_CLOCKSOURCE) | | |
638 | (1 << KVM_FEATURE_NOP_IO_DELAY) | | |
639 | (1 << KVM_FEATURE_CLOCKSOURCE2) | | |
640 | (1 << KVM_FEATURE_ASYNC_PF) | | |
ae7a2a3f | 641 | (1 << KVM_FEATURE_PV_EOI) | |
6aef266c | 642 | (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT) | |
f38a7b75 | 643 | (1 << KVM_FEATURE_PV_UNHALT) | |
fe2a3027 | 644 | (1 << KVM_FEATURE_PV_TLB_FLUSH) | |
4180bf1b WL |
645 | (1 << KVM_FEATURE_ASYNC_PF_VMEXIT) | |
646 | (1 << KVM_FEATURE_PV_SEND_IPI); | |
00b27a3e AK |
647 | |
648 | if (sched_info_on()) | |
649 | entry->eax |= (1 << KVM_FEATURE_STEAL_TIME); | |
650 | ||
651 | entry->ebx = 0; | |
652 | entry->ecx = 0; | |
653 | entry->edx = 0; | |
654 | break; | |
655 | case 0x80000000: | |
8765d753 | 656 | entry->eax = min(entry->eax, 0x8000001f); |
00b27a3e AK |
657 | break; |
658 | case 0x80000001: | |
e0b18ef7 HH |
659 | entry->edx &= kvm_cpuid_8000_0001_edx_x86_features; |
660 | cpuid_mask(&entry->edx, CPUID_8000_0001_EDX); | |
661 | entry->ecx &= kvm_cpuid_8000_0001_ecx_x86_features; | |
662 | cpuid_mask(&entry->ecx, CPUID_8000_0001_ECX); | |
00b27a3e | 663 | break; |
e4c9a5a1 MT |
664 | case 0x80000007: /* Advanced power management */ |
665 | /* invariant TSC is CPUID.80000007H:EDX[8] */ | |
666 | entry->edx &= (1 << 8); | |
667 | /* mask against host */ | |
668 | entry->edx &= boot_cpu_data.x86_power; | |
669 | entry->eax = entry->ebx = entry->ecx = 0; | |
670 | break; | |
00b27a3e AK |
671 | case 0x80000008: { |
672 | unsigned g_phys_as = (entry->eax >> 16) & 0xff; | |
673 | unsigned virt_as = max((entry->eax >> 8) & 0xff, 48U); | |
674 | unsigned phys_as = entry->eax & 0xff; | |
675 | ||
676 | if (!g_phys_as) | |
677 | g_phys_as = phys_as; | |
678 | entry->eax = g_phys_as | (virt_as << 8); | |
15d45071 | 679 | entry->edx = 0; |
bc226f07 TL |
680 | /* |
681 | * IBRS, IBPB and VIRT_SSBD aren't necessarily present in | |
682 | * hardware cpuid | |
683 | */ | |
e7c587da BP |
684 | if (boot_cpu_has(X86_FEATURE_AMD_IBPB)) |
685 | entry->ebx |= F(AMD_IBPB); | |
686 | if (boot_cpu_has(X86_FEATURE_AMD_IBRS)) | |
687 | entry->ebx |= F(AMD_IBRS); | |
bc226f07 TL |
688 | if (boot_cpu_has(X86_FEATURE_VIRT_SSBD)) |
689 | entry->ebx |= F(VIRT_SSBD); | |
15d45071 AR |
690 | entry->ebx &= kvm_cpuid_8000_0008_ebx_x86_features; |
691 | cpuid_mask(&entry->ebx, CPUID_8000_0008_EBX); | |
6ac2f49e KRW |
692 | /* |
693 | * The preference is to use SPEC CTRL MSR instead of the | |
694 | * VIRT_SPEC MSR. | |
695 | */ | |
696 | if (boot_cpu_has(X86_FEATURE_LS_CFG_SSBD) && | |
697 | !boot_cpu_has(X86_FEATURE_AMD_SSBD)) | |
bc226f07 | 698 | entry->ebx |= F(VIRT_SSBD); |
00b27a3e AK |
699 | break; |
700 | } | |
701 | case 0x80000019: | |
702 | entry->ecx = entry->edx = 0; | |
703 | break; | |
704 | case 0x8000001a: | |
382409b4 | 705 | case 0x8000001e: |
00b27a3e | 706 | break; |
00b27a3e AK |
707 | /*Add support for Centaur's CPUID instruction*/ |
708 | case 0xC0000000: | |
709 | /*Just support up to 0xC0000004 now*/ | |
710 | entry->eax = min(entry->eax, 0xC0000004); | |
711 | break; | |
712 | case 0xC0000001: | |
e0b18ef7 HH |
713 | entry->edx &= kvm_cpuid_C000_0001_edx_x86_features; |
714 | cpuid_mask(&entry->edx, CPUID_C000_0001_EDX); | |
00b27a3e AK |
715 | break; |
716 | case 3: /* Processor serial number */ | |
717 | case 5: /* MONITOR/MWAIT */ | |
00b27a3e AK |
718 | case 0xC0000002: |
719 | case 0xC0000003: | |
720 | case 0xC0000004: | |
721 | default: | |
722 | entry->eax = entry->ebx = entry->ecx = entry->edx = 0; | |
723 | break; | |
724 | } | |
725 | ||
726 | kvm_x86_ops->set_supported_cpuid(function, entry); | |
727 | ||
831bf664 SL |
728 | r = 0; |
729 | ||
730 | out: | |
00b27a3e | 731 | put_cpu(); |
831bf664 SL |
732 | |
733 | return r; | |
00b27a3e AK |
734 | } |
735 | ||
9c15bb1d BP |
736 | static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 func, |
737 | u32 idx, int *nent, int maxnent, unsigned int type) | |
738 | { | |
739 | if (type == KVM_GET_EMULATED_CPUID) | |
740 | return __do_cpuid_ent_emulated(entry, func, idx, nent, maxnent); | |
741 | ||
742 | return __do_cpuid_ent(entry, func, idx, nent, maxnent); | |
743 | } | |
744 | ||
00b27a3e AK |
745 | #undef F |
746 | ||
831bf664 SL |
747 | struct kvm_cpuid_param { |
748 | u32 func; | |
749 | u32 idx; | |
750 | bool has_leaf_count; | |
326d07cb | 751 | bool (*qualifier)(const struct kvm_cpuid_param *param); |
831bf664 SL |
752 | }; |
753 | ||
326d07cb | 754 | static bool is_centaur_cpu(const struct kvm_cpuid_param *param) |
831bf664 SL |
755 | { |
756 | return boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR; | |
757 | } | |
758 | ||
9c15bb1d BP |
759 | static bool sanity_check_entries(struct kvm_cpuid_entry2 __user *entries, |
760 | __u32 num_entries, unsigned int ioctl_type) | |
761 | { | |
762 | int i; | |
1b2ca422 | 763 | __u32 pad[3]; |
9c15bb1d BP |
764 | |
765 | if (ioctl_type != KVM_GET_EMULATED_CPUID) | |
766 | return false; | |
767 | ||
768 | /* | |
769 | * We want to make sure that ->padding is being passed clean from | |
770 | * userspace in case we want to use it for something in the future. | |
771 | * | |
772 | * Sadly, this wasn't enforced for KVM_GET_SUPPORTED_CPUID and so we | |
773 | * have to give ourselves satisfied only with the emulated side. /me | |
774 | * sheds a tear. | |
775 | */ | |
776 | for (i = 0; i < num_entries; i++) { | |
1b2ca422 BP |
777 | if (copy_from_user(pad, entries[i].padding, sizeof(pad))) |
778 | return true; | |
779 | ||
780 | if (pad[0] || pad[1] || pad[2]) | |
9c15bb1d BP |
781 | return true; |
782 | } | |
783 | return false; | |
784 | } | |
785 | ||
786 | int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid, | |
787 | struct kvm_cpuid_entry2 __user *entries, | |
788 | unsigned int type) | |
00b27a3e AK |
789 | { |
790 | struct kvm_cpuid_entry2 *cpuid_entries; | |
831bf664 | 791 | int limit, nent = 0, r = -E2BIG, i; |
00b27a3e | 792 | u32 func; |
326d07cb | 793 | static const struct kvm_cpuid_param param[] = { |
831bf664 SL |
794 | { .func = 0, .has_leaf_count = true }, |
795 | { .func = 0x80000000, .has_leaf_count = true }, | |
796 | { .func = 0xC0000000, .qualifier = is_centaur_cpu, .has_leaf_count = true }, | |
797 | { .func = KVM_CPUID_SIGNATURE }, | |
798 | { .func = KVM_CPUID_FEATURES }, | |
799 | }; | |
00b27a3e AK |
800 | |
801 | if (cpuid->nent < 1) | |
802 | goto out; | |
803 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) | |
804 | cpuid->nent = KVM_MAX_CPUID_ENTRIES; | |
9c15bb1d BP |
805 | |
806 | if (sanity_check_entries(entries, cpuid->nent, type)) | |
807 | return -EINVAL; | |
808 | ||
00b27a3e | 809 | r = -ENOMEM; |
fad953ce KC |
810 | cpuid_entries = vzalloc(array_size(sizeof(struct kvm_cpuid_entry2), |
811 | cpuid->nent)); | |
00b27a3e AK |
812 | if (!cpuid_entries) |
813 | goto out; | |
814 | ||
831bf664 SL |
815 | r = 0; |
816 | for (i = 0; i < ARRAY_SIZE(param); i++) { | |
326d07cb | 817 | const struct kvm_cpuid_param *ent = ¶m[i]; |
00b27a3e | 818 | |
831bf664 SL |
819 | if (ent->qualifier && !ent->qualifier(ent)) |
820 | continue; | |
00b27a3e | 821 | |
831bf664 | 822 | r = do_cpuid_ent(&cpuid_entries[nent], ent->func, ent->idx, |
9c15bb1d | 823 | &nent, cpuid->nent, type); |
00b27a3e | 824 | |
831bf664 | 825 | if (r) |
00b27a3e AK |
826 | goto out_free; |
827 | ||
831bf664 SL |
828 | if (!ent->has_leaf_count) |
829 | continue; | |
830 | ||
00b27a3e | 831 | limit = cpuid_entries[nent - 1].eax; |
831bf664 SL |
832 | for (func = ent->func + 1; func <= limit && nent < cpuid->nent && r == 0; ++func) |
833 | r = do_cpuid_ent(&cpuid_entries[nent], func, ent->idx, | |
9c15bb1d | 834 | &nent, cpuid->nent, type); |
00b27a3e | 835 | |
831bf664 | 836 | if (r) |
00b27a3e AK |
837 | goto out_free; |
838 | } | |
839 | ||
00b27a3e AK |
840 | r = -EFAULT; |
841 | if (copy_to_user(entries, cpuid_entries, | |
842 | nent * sizeof(struct kvm_cpuid_entry2))) | |
843 | goto out_free; | |
844 | cpuid->nent = nent; | |
845 | r = 0; | |
846 | ||
847 | out_free: | |
848 | vfree(cpuid_entries); | |
849 | out: | |
850 | return r; | |
851 | } | |
852 | ||
853 | static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i) | |
854 | { | |
855 | struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i]; | |
a3641631 WL |
856 | struct kvm_cpuid_entry2 *ej; |
857 | int j = i; | |
858 | int nent = vcpu->arch.cpuid_nent; | |
00b27a3e AK |
859 | |
860 | e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT; | |
861 | /* when no next entry is found, the current entry[i] is reselected */ | |
a3641631 WL |
862 | do { |
863 | j = (j + 1) % nent; | |
864 | ej = &vcpu->arch.cpuid_entries[j]; | |
865 | } while (ej->function != e->function); | |
866 | ||
867 | ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT; | |
868 | ||
869 | return j; | |
00b27a3e AK |
870 | } |
871 | ||
872 | /* find an entry with matching function, matching index (if needed), and that | |
873 | * should be read next (if it's stateful) */ | |
874 | static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e, | |
875 | u32 function, u32 index) | |
876 | { | |
877 | if (e->function != function) | |
878 | return 0; | |
879 | if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index) | |
880 | return 0; | |
881 | if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) && | |
882 | !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT)) | |
883 | return 0; | |
884 | return 1; | |
885 | } | |
886 | ||
887 | struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu, | |
888 | u32 function, u32 index) | |
889 | { | |
890 | int i; | |
891 | struct kvm_cpuid_entry2 *best = NULL; | |
892 | ||
893 | for (i = 0; i < vcpu->arch.cpuid_nent; ++i) { | |
894 | struct kvm_cpuid_entry2 *e; | |
895 | ||
896 | e = &vcpu->arch.cpuid_entries[i]; | |
897 | if (is_matching_cpuid_entry(e, function, index)) { | |
898 | if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) | |
899 | move_to_next_stateful_cpuid_entry(vcpu, i); | |
900 | best = e; | |
901 | break; | |
902 | } | |
903 | } | |
904 | return best; | |
905 | } | |
906 | EXPORT_SYMBOL_GPL(kvm_find_cpuid_entry); | |
907 | ||
00b27a3e AK |
908 | /* |
909 | * If no match is found, check whether we exceed the vCPU's limit | |
910 | * and return the content of the highest valid _standard_ leaf instead. | |
911 | * This is to satisfy the CPUID specification. | |
912 | */ | |
913 | static struct kvm_cpuid_entry2* check_cpuid_limit(struct kvm_vcpu *vcpu, | |
914 | u32 function, u32 index) | |
915 | { | |
916 | struct kvm_cpuid_entry2 *maxlevel; | |
917 | ||
918 | maxlevel = kvm_find_cpuid_entry(vcpu, function & 0x80000000, 0); | |
919 | if (!maxlevel || maxlevel->eax >= function) | |
920 | return NULL; | |
921 | if (function & 0x80000000) { | |
922 | maxlevel = kvm_find_cpuid_entry(vcpu, 0, 0); | |
923 | if (!maxlevel) | |
924 | return NULL; | |
925 | } | |
926 | return kvm_find_cpuid_entry(vcpu, maxlevel->eax, index); | |
927 | } | |
928 | ||
e911eb3b YZ |
929 | bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx, |
930 | u32 *ecx, u32 *edx, bool check_limit) | |
00b27a3e | 931 | { |
62046e5a | 932 | u32 function = *eax, index = *ecx; |
00b27a3e | 933 | struct kvm_cpuid_entry2 *best; |
e911eb3b | 934 | bool entry_found = true; |
00b27a3e | 935 | |
00b27a3e AK |
936 | best = kvm_find_cpuid_entry(vcpu, function, index); |
937 | ||
e911eb3b YZ |
938 | if (!best) { |
939 | entry_found = false; | |
940 | if (!check_limit) | |
941 | goto out; | |
942 | ||
00b27a3e | 943 | best = check_cpuid_limit(vcpu, function, index); |
e911eb3b | 944 | } |
00b27a3e | 945 | |
e911eb3b | 946 | out: |
00b27a3e | 947 | if (best) { |
62046e5a AK |
948 | *eax = best->eax; |
949 | *ebx = best->ebx; | |
950 | *ecx = best->ecx; | |
951 | *edx = best->edx; | |
952 | } else | |
953 | *eax = *ebx = *ecx = *edx = 0; | |
e911eb3b YZ |
954 | trace_kvm_cpuid(function, *eax, *ebx, *ecx, *edx, entry_found); |
955 | return entry_found; | |
62046e5a | 956 | } |
66f7b72e | 957 | EXPORT_SYMBOL_GPL(kvm_cpuid); |
62046e5a | 958 | |
6a908b62 | 959 | int kvm_emulate_cpuid(struct kvm_vcpu *vcpu) |
62046e5a | 960 | { |
1e13175b | 961 | u32 eax, ebx, ecx, edx; |
62046e5a | 962 | |
db2336a8 KH |
963 | if (cpuid_fault_enabled(vcpu) && !kvm_require_cpl(vcpu, 0)) |
964 | return 1; | |
965 | ||
de3cd117 SC |
966 | eax = kvm_rax_read(vcpu); |
967 | ecx = kvm_rcx_read(vcpu); | |
e911eb3b | 968 | kvm_cpuid(vcpu, &eax, &ebx, &ecx, &edx, true); |
de3cd117 SC |
969 | kvm_rax_write(vcpu, eax); |
970 | kvm_rbx_write(vcpu, ebx); | |
971 | kvm_rcx_write(vcpu, ecx); | |
972 | kvm_rdx_write(vcpu, edx); | |
6affcbed | 973 | return kvm_skip_emulated_instruction(vcpu); |
00b27a3e AK |
974 | } |
975 | EXPORT_SYMBOL_GPL(kvm_emulate_cpuid); |