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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 | ||
4504b5c9 LK |
70 | /* These are scattered features in cpufeatures.h. */ |
71 | #define KVM_CPUID_BIT_AVX512_4VNNIW 2 | |
72 | #define KVM_CPUID_BIT_AVX512_4FMAPS 3 | |
73 | #define KF(x) bit(KVM_CPUID_BIT_##x) | |
74 | ||
dd598091 | 75 | int kvm_update_cpuid(struct kvm_vcpu *vcpu) |
00b27a3e AK |
76 | { |
77 | struct kvm_cpuid_entry2 *best; | |
78 | struct kvm_lapic *apic = vcpu->arch.apic; | |
79 | ||
80 | best = kvm_find_cpuid_entry(vcpu, 1, 0); | |
81 | if (!best) | |
dd598091 | 82 | return 0; |
00b27a3e AK |
83 | |
84 | /* Update OSXSAVE bit */ | |
d366bf7e | 85 | if (boot_cpu_has(X86_FEATURE_XSAVE) && best->function == 0x1) { |
5c404cab | 86 | best->ecx &= ~F(OSXSAVE); |
00b27a3e | 87 | if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE)) |
5c404cab | 88 | best->ecx |= F(OSXSAVE); |
00b27a3e AK |
89 | } |
90 | ||
c7dd15b3 JM |
91 | best->edx &= ~F(APIC); |
92 | if (vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE) | |
93 | best->edx |= F(APIC); | |
94 | ||
00b27a3e | 95 | if (apic) { |
5c404cab | 96 | if (best->ecx & F(TSC_DEADLINE_TIMER)) |
00b27a3e AK |
97 | apic->lapic_timer.timer_mode_mask = 3 << 17; |
98 | else | |
99 | apic->lapic_timer.timer_mode_mask = 1 << 17; | |
100 | } | |
f5132b01 | 101 | |
b9baba86 HH |
102 | best = kvm_find_cpuid_entry(vcpu, 7, 0); |
103 | if (best) { | |
104 | /* Update OSPKE bit */ | |
105 | if (boot_cpu_has(X86_FEATURE_PKU) && best->function == 0x7) { | |
106 | best->ecx &= ~F(OSPKE); | |
107 | if (kvm_read_cr4_bits(vcpu, X86_CR4_PKE)) | |
108 | best->ecx |= F(OSPKE); | |
109 | } | |
110 | } | |
111 | ||
d7876f1b | 112 | best = kvm_find_cpuid_entry(vcpu, 0xD, 0); |
4344ee98 | 113 | if (!best) { |
d7876f1b | 114 | vcpu->arch.guest_supported_xcr0 = 0; |
4344ee98 PB |
115 | vcpu->arch.guest_xstate_size = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET; |
116 | } else { | |
d7876f1b PB |
117 | vcpu->arch.guest_supported_xcr0 = |
118 | (best->eax | ((u64)best->edx << 32)) & | |
4ff41732 | 119 | kvm_supported_xcr0(); |
56c103ec | 120 | vcpu->arch.guest_xstate_size = best->ebx = |
412a3c41 | 121 | xstate_required_size(vcpu->arch.xcr0, false); |
4344ee98 | 122 | } |
d7876f1b | 123 | |
412a3c41 PB |
124 | best = kvm_find_cpuid_entry(vcpu, 0xD, 1); |
125 | if (best && (best->eax & (F(XSAVES) | F(XSAVEC)))) | |
126 | best->ebx = xstate_required_size(vcpu->arch.xcr0, true); | |
127 | ||
dd598091 | 128 | /* |
fd8cb433 YZ |
129 | * The existing code assumes virtual address is 48-bit or 57-bit in the |
130 | * canonical address checks; exit if it is ever changed. | |
dd598091 NA |
131 | */ |
132 | best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0); | |
fd8cb433 YZ |
133 | if (best) { |
134 | int vaddr_bits = (best->eax & 0xff00) >> 8; | |
135 | ||
136 | if (vaddr_bits != 48 && vaddr_bits != 57 && vaddr_bits != 0) | |
137 | return -EINVAL; | |
138 | } | |
dd598091 | 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 PB |
202 | if (cpuid->nent) { |
203 | cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * | |
204 | cpuid->nent); | |
205 | if (!cpuid_entries) | |
206 | goto out; | |
207 | r = -EFAULT; | |
208 | if (copy_from_user(cpuid_entries, entries, | |
209 | cpuid->nent * sizeof(struct kvm_cpuid_entry))) | |
210 | goto out; | |
211 | } | |
00b27a3e AK |
212 | for (i = 0; i < cpuid->nent; i++) { |
213 | vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function; | |
214 | vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax; | |
215 | vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx; | |
216 | vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx; | |
217 | vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx; | |
218 | vcpu->arch.cpuid_entries[i].index = 0; | |
219 | vcpu->arch.cpuid_entries[i].flags = 0; | |
220 | vcpu->arch.cpuid_entries[i].padding[0] = 0; | |
221 | vcpu->arch.cpuid_entries[i].padding[1] = 0; | |
222 | vcpu->arch.cpuid_entries[i].padding[2] = 0; | |
223 | } | |
224 | vcpu->arch.cpuid_nent = cpuid->nent; | |
225 | cpuid_fix_nx_cap(vcpu); | |
00b27a3e AK |
226 | kvm_apic_set_version(vcpu); |
227 | kvm_x86_ops->cpuid_update(vcpu); | |
dd598091 | 228 | r = kvm_update_cpuid(vcpu); |
00b27a3e | 229 | |
00b27a3e | 230 | out: |
83676e92 | 231 | vfree(cpuid_entries); |
00b27a3e AK |
232 | return r; |
233 | } | |
234 | ||
235 | int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu, | |
236 | struct kvm_cpuid2 *cpuid, | |
237 | struct kvm_cpuid_entry2 __user *entries) | |
238 | { | |
239 | int r; | |
240 | ||
241 | r = -E2BIG; | |
242 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) | |
243 | goto out; | |
244 | r = -EFAULT; | |
245 | if (copy_from_user(&vcpu->arch.cpuid_entries, entries, | |
246 | cpuid->nent * sizeof(struct kvm_cpuid_entry2))) | |
247 | goto out; | |
248 | vcpu->arch.cpuid_nent = cpuid->nent; | |
249 | kvm_apic_set_version(vcpu); | |
250 | kvm_x86_ops->cpuid_update(vcpu); | |
dd598091 | 251 | r = kvm_update_cpuid(vcpu); |
00b27a3e AK |
252 | out: |
253 | return r; | |
254 | } | |
255 | ||
256 | int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu, | |
257 | struct kvm_cpuid2 *cpuid, | |
258 | struct kvm_cpuid_entry2 __user *entries) | |
259 | { | |
260 | int r; | |
261 | ||
262 | r = -E2BIG; | |
263 | if (cpuid->nent < vcpu->arch.cpuid_nent) | |
264 | goto out; | |
265 | r = -EFAULT; | |
266 | if (copy_to_user(entries, &vcpu->arch.cpuid_entries, | |
267 | vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2))) | |
268 | goto out; | |
269 | return 0; | |
270 | ||
271 | out: | |
272 | cpuid->nent = vcpu->arch.cpuid_nent; | |
273 | return r; | |
274 | } | |
275 | ||
276 | static void cpuid_mask(u32 *word, int wordnum) | |
277 | { | |
278 | *word &= boot_cpu_data.x86_capability[wordnum]; | |
279 | } | |
280 | ||
281 | static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function, | |
282 | u32 index) | |
283 | { | |
284 | entry->function = function; | |
285 | entry->index = index; | |
286 | cpuid_count(entry->function, entry->index, | |
287 | &entry->eax, &entry->ebx, &entry->ecx, &entry->edx); | |
288 | entry->flags = 0; | |
289 | } | |
290 | ||
9c15bb1d BP |
291 | static int __do_cpuid_ent_emulated(struct kvm_cpuid_entry2 *entry, |
292 | u32 func, u32 index, int *nent, int maxnent) | |
293 | { | |
84cffe49 BP |
294 | switch (func) { |
295 | case 0: | |
296 | entry->eax = 1; /* only one leaf currently */ | |
297 | ++*nent; | |
298 | break; | |
299 | case 1: | |
300 | entry->ecx = F(MOVBE); | |
301 | ++*nent; | |
302 | break; | |
303 | default: | |
304 | break; | |
305 | } | |
306 | ||
307 | entry->function = func; | |
308 | entry->index = index; | |
309 | ||
9c15bb1d BP |
310 | return 0; |
311 | } | |
312 | ||
313 | static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, | |
314 | u32 index, int *nent, int maxnent) | |
00b27a3e | 315 | { |
831bf664 | 316 | int r; |
00b27a3e AK |
317 | unsigned f_nx = is_efer_nx() ? F(NX) : 0; |
318 | #ifdef CONFIG_X86_64 | |
319 | unsigned f_gbpages = (kvm_x86_ops->get_lpage_level() == PT_PDPE_LEVEL) | |
320 | ? F(GBPAGES) : 0; | |
321 | unsigned f_lm = F(LM); | |
322 | #else | |
323 | unsigned f_gbpages = 0; | |
324 | unsigned f_lm = 0; | |
325 | #endif | |
326 | unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0; | |
ad756a16 | 327 | unsigned f_invpcid = kvm_x86_ops->invpcid_supported() ? F(INVPCID) : 0; |
a87036ad | 328 | unsigned f_mpx = kvm_mpx_supported() ? F(MPX) : 0; |
55412b2e | 329 | unsigned f_xsaves = kvm_x86_ops->xsaves_supported() ? F(XSAVES) : 0; |
00b27a3e AK |
330 | |
331 | /* cpuid 1.edx */ | |
e0b18ef7 | 332 | const u32 kvm_cpuid_1_edx_x86_features = |
00b27a3e AK |
333 | F(FPU) | F(VME) | F(DE) | F(PSE) | |
334 | F(TSC) | F(MSR) | F(PAE) | F(MCE) | | |
335 | F(CX8) | F(APIC) | 0 /* Reserved */ | F(SEP) | | |
336 | F(MTRR) | F(PGE) | F(MCA) | F(CMOV) | | |
840d2830 | 337 | F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLUSH) | |
00b27a3e AK |
338 | 0 /* Reserved, DS, ACPI */ | F(MMX) | |
339 | F(FXSR) | F(XMM) | F(XMM2) | F(SELFSNOOP) | | |
340 | 0 /* HTT, TM, Reserved, PBE */; | |
341 | /* cpuid 0x80000001.edx */ | |
e0b18ef7 | 342 | const u32 kvm_cpuid_8000_0001_edx_x86_features = |
00b27a3e AK |
343 | F(FPU) | F(VME) | F(DE) | F(PSE) | |
344 | F(TSC) | F(MSR) | F(PAE) | F(MCE) | | |
345 | F(CX8) | F(APIC) | 0 /* Reserved */ | F(SYSCALL) | | |
346 | F(MTRR) | F(PGE) | F(MCA) | F(CMOV) | | |
347 | F(PAT) | F(PSE36) | 0 /* Reserved */ | | |
348 | f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) | | |
349 | F(FXSR) | F(FXSR_OPT) | f_gbpages | f_rdtscp | | |
350 | 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW); | |
351 | /* cpuid 1.ecx */ | |
e0b18ef7 | 352 | const u32 kvm_cpuid_1_ecx_x86_features = |
87c00572 GS |
353 | /* NOTE: MONITOR (and MWAIT) are emulated as NOP, |
354 | * but *not* advertised to guests via CPUID ! */ | |
00b27a3e AK |
355 | F(XMM3) | F(PCLMULQDQ) | 0 /* DTES64, MONITOR */ | |
356 | 0 /* DS-CPL, VMX, SMX, EST */ | | |
357 | 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ | | |
fb215366 | 358 | F(FMA) | F(CX16) | 0 /* xTPR Update, PDCM */ | |
ad756a16 | 359 | F(PCID) | 0 /* Reserved, DCA */ | F(XMM4_1) | |
00b27a3e AK |
360 | F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) | |
361 | 0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) | | |
362 | F(F16C) | F(RDRAND); | |
363 | /* cpuid 0x80000001.ecx */ | |
e0b18ef7 | 364 | const u32 kvm_cpuid_8000_0001_ecx_x86_features = |
00b27a3e AK |
365 | F(LAHF_LM) | F(CMP_LEGACY) | 0 /*SVM*/ | 0 /* ExtApicSpace */ | |
366 | F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) | | |
2b036c6b | 367 | F(3DNOWPREFETCH) | F(OSVW) | 0 /* IBS */ | F(XOP) | |
00b27a3e AK |
368 | 0 /* SKINIT, WDT, LWP */ | F(FMA4) | F(TBM); |
369 | ||
370 | /* cpuid 0xC0000001.edx */ | |
e0b18ef7 | 371 | const u32 kvm_cpuid_C000_0001_edx_x86_features = |
00b27a3e AK |
372 | F(XSTORE) | F(XSTORE_EN) | F(XCRYPT) | F(XCRYPT_EN) | |
373 | F(ACE2) | F(ACE2_EN) | F(PHE) | F(PHE_EN) | | |
374 | F(PMM) | F(PMM_EN); | |
375 | ||
376 | /* cpuid 7.0.ebx */ | |
e0b18ef7 | 377 | const u32 kvm_cpuid_7_0_ebx_x86_features = |
83c52915 | 378 | F(FSGSBASE) | F(BMI1) | F(HLE) | F(AVX2) | F(SMEP) | |
390bd528 | 379 | F(BMI2) | F(ERMS) | f_invpcid | F(RTM) | f_mpx | F(RDSEED) | |
83781d18 YS |
380 | F(ADX) | F(SMAP) | F(AVX512IFMA) | F(AVX512F) | F(AVX512PF) | |
381 | F(AVX512ER) | F(AVX512CD) | F(CLFLUSHOPT) | F(CLWB) | F(AVX512DQ) | | |
382 | F(SHA_NI) | F(AVX512BW) | F(AVX512VL); | |
00b27a3e | 383 | |
b65d6e17 | 384 | /* cpuid 0xD.1.eax */ |
e0b18ef7 | 385 | const u32 kvm_cpuid_D_1_eax_x86_features = |
55412b2e | 386 | F(XSAVEOPT) | F(XSAVEC) | F(XGETBV1) | f_xsaves; |
b65d6e17 | 387 | |
b9baba86 | 388 | /* cpuid 7.0.ecx*/ |
83781d18 | 389 | const u32 kvm_cpuid_7_0_ecx_x86_features = |
fd8cb433 YZ |
390 | F(AVX512VBMI) | F(LA57) | F(PKU) | |
391 | 0 /*OSPKE*/ | F(AVX512_VPOPCNTDQ); | |
b9baba86 | 392 | |
4504b5c9 LK |
393 | /* cpuid 7.0.edx*/ |
394 | const u32 kvm_cpuid_7_0_edx_x86_features = | |
395 | KF(AVX512_4VNNIW) | KF(AVX512_4FMAPS); | |
396 | ||
00b27a3e AK |
397 | /* all calls to cpuid_count() should be made on the same cpu */ |
398 | get_cpu(); | |
831bf664 SL |
399 | |
400 | r = -E2BIG; | |
401 | ||
402 | if (*nent >= maxnent) | |
403 | goto out; | |
404 | ||
00b27a3e AK |
405 | do_cpuid_1_ent(entry, function, index); |
406 | ++*nent; | |
407 | ||
408 | switch (function) { | |
409 | case 0: | |
410 | entry->eax = min(entry->eax, (u32)0xd); | |
411 | break; | |
412 | case 1: | |
e0b18ef7 HH |
413 | entry->edx &= kvm_cpuid_1_edx_x86_features; |
414 | cpuid_mask(&entry->edx, CPUID_1_EDX); | |
415 | entry->ecx &= kvm_cpuid_1_ecx_x86_features; | |
416 | cpuid_mask(&entry->ecx, CPUID_1_ECX); | |
00b27a3e AK |
417 | /* we support x2apic emulation even if host does not support |
418 | * it since we emulate x2apic in software */ | |
419 | entry->ecx |= F(X2APIC); | |
420 | break; | |
421 | /* function 2 entries are STATEFUL. That is, repeated cpuid commands | |
422 | * may return different values. This forces us to get_cpu() before | |
423 | * issuing the first command, and also to emulate this annoying behavior | |
424 | * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */ | |
425 | case 2: { | |
426 | int t, times = entry->eax & 0xff; | |
427 | ||
428 | entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; | |
429 | entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT; | |
831bf664 SL |
430 | for (t = 1; t < times; ++t) { |
431 | if (*nent >= maxnent) | |
432 | goto out; | |
433 | ||
00b27a3e AK |
434 | do_cpuid_1_ent(&entry[t], function, 0); |
435 | entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; | |
436 | ++*nent; | |
437 | } | |
438 | break; | |
439 | } | |
440 | /* function 4 has additional index. */ | |
441 | case 4: { | |
442 | int i, cache_type; | |
443 | ||
444 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
445 | /* read more entries until cache_type is zero */ | |
831bf664 SL |
446 | for (i = 1; ; ++i) { |
447 | if (*nent >= maxnent) | |
448 | goto out; | |
449 | ||
00b27a3e AK |
450 | cache_type = entry[i - 1].eax & 0x1f; |
451 | if (!cache_type) | |
452 | break; | |
453 | do_cpuid_1_ent(&entry[i], function, i); | |
454 | entry[i].flags |= | |
455 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
456 | ++*nent; | |
457 | } | |
458 | break; | |
459 | } | |
e453aa0f JK |
460 | case 6: /* Thermal management */ |
461 | entry->eax = 0x4; /* allow ARAT */ | |
462 | entry->ebx = 0; | |
463 | entry->ecx = 0; | |
464 | entry->edx = 0; | |
465 | break; | |
00b27a3e AK |
466 | case 7: { |
467 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
bbbda795 | 468 | /* Mask ebx against host capability word 9 */ |
00b27a3e | 469 | if (index == 0) { |
e0b18ef7 HH |
470 | entry->ebx &= kvm_cpuid_7_0_ebx_x86_features; |
471 | cpuid_mask(&entry->ebx, CPUID_7_0_EBX); | |
ba904635 WA |
472 | // TSC_ADJUST is emulated |
473 | entry->ebx |= F(TSC_ADJUST); | |
b9baba86 HH |
474 | entry->ecx &= kvm_cpuid_7_0_ecx_x86_features; |
475 | cpuid_mask(&entry->ecx, CPUID_7_ECX); | |
476 | /* PKU is not yet implemented for shadow paging. */ | |
477 | if (!tdp_enabled) | |
478 | entry->ecx &= ~F(PKU); | |
4504b5c9 LK |
479 | entry->edx &= kvm_cpuid_7_0_edx_x86_features; |
480 | entry->edx &= get_scattered_cpuid_leaf(7, 0, CPUID_EDX); | |
b9baba86 | 481 | } else { |
00b27a3e | 482 | entry->ebx = 0; |
b9baba86 | 483 | entry->ecx = 0; |
4504b5c9 | 484 | entry->edx = 0; |
b9baba86 | 485 | } |
00b27a3e | 486 | entry->eax = 0; |
00b27a3e AK |
487 | break; |
488 | } | |
489 | case 9: | |
490 | break; | |
a6c06ed1 GN |
491 | case 0xa: { /* Architectural Performance Monitoring */ |
492 | struct x86_pmu_capability cap; | |
493 | union cpuid10_eax eax; | |
494 | union cpuid10_edx edx; | |
495 | ||
496 | perf_get_x86_pmu_capability(&cap); | |
497 | ||
498 | /* | |
499 | * Only support guest architectural pmu on a host | |
500 | * with architectural pmu. | |
501 | */ | |
502 | if (!cap.version) | |
503 | memset(&cap, 0, sizeof(cap)); | |
504 | ||
505 | eax.split.version_id = min(cap.version, 2); | |
506 | eax.split.num_counters = cap.num_counters_gp; | |
507 | eax.split.bit_width = cap.bit_width_gp; | |
508 | eax.split.mask_length = cap.events_mask_len; | |
509 | ||
510 | edx.split.num_counters_fixed = cap.num_counters_fixed; | |
511 | edx.split.bit_width_fixed = cap.bit_width_fixed; | |
512 | edx.split.reserved = 0; | |
513 | ||
514 | entry->eax = eax.full; | |
515 | entry->ebx = cap.events_mask; | |
516 | entry->ecx = 0; | |
517 | entry->edx = edx.full; | |
518 | break; | |
519 | } | |
00b27a3e AK |
520 | /* function 0xb has additional index. */ |
521 | case 0xb: { | |
522 | int i, level_type; | |
523 | ||
524 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
525 | /* read more entries until level_type is zero */ | |
831bf664 SL |
526 | for (i = 1; ; ++i) { |
527 | if (*nent >= maxnent) | |
528 | goto out; | |
529 | ||
00b27a3e AK |
530 | level_type = entry[i - 1].ecx & 0xff00; |
531 | if (!level_type) | |
532 | break; | |
533 | do_cpuid_1_ent(&entry[i], function, i); | |
534 | entry[i].flags |= | |
535 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
536 | ++*nent; | |
537 | } | |
538 | break; | |
539 | } | |
540 | case 0xd: { | |
541 | int idx, i; | |
4ff41732 | 542 | u64 supported = kvm_supported_xcr0(); |
00b27a3e | 543 | |
4ff41732 | 544 | entry->eax &= supported; |
e08e8336 RK |
545 | entry->ebx = xstate_required_size(supported, false); |
546 | entry->ecx = entry->ebx; | |
4ff41732 | 547 | entry->edx &= supported >> 32; |
00b27a3e | 548 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
b65d6e17 PB |
549 | if (!supported) |
550 | break; | |
551 | ||
831bf664 | 552 | for (idx = 1, i = 1; idx < 64; ++idx) { |
4ff41732 | 553 | u64 mask = ((u64)1 << idx); |
831bf664 SL |
554 | if (*nent >= maxnent) |
555 | goto out; | |
556 | ||
00b27a3e | 557 | do_cpuid_1_ent(&entry[i], function, idx); |
412a3c41 | 558 | if (idx == 1) { |
e0b18ef7 | 559 | entry[i].eax &= kvm_cpuid_D_1_eax_x86_features; |
316314ca | 560 | cpuid_mask(&entry[i].eax, CPUID_D_1_EAX); |
412a3c41 PB |
561 | entry[i].ebx = 0; |
562 | if (entry[i].eax & (F(XSAVES)|F(XSAVEC))) | |
563 | entry[i].ebx = | |
564 | xstate_required_size(supported, | |
565 | true); | |
404e0a19 PB |
566 | } else { |
567 | if (entry[i].eax == 0 || !(supported & mask)) | |
568 | continue; | |
569 | if (WARN_ON_ONCE(entry[i].ecx & 1)) | |
570 | continue; | |
571 | } | |
572 | entry[i].ecx = 0; | |
573 | entry[i].edx = 0; | |
00b27a3e AK |
574 | entry[i].flags |= |
575 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
576 | ++*nent; | |
577 | ++i; | |
578 | } | |
579 | break; | |
580 | } | |
581 | case KVM_CPUID_SIGNATURE: { | |
326d07cb MK |
582 | static const char signature[12] = "KVMKVMKVM\0\0"; |
583 | const u32 *sigptr = (const u32 *)signature; | |
57c22e5f | 584 | entry->eax = KVM_CPUID_FEATURES; |
00b27a3e AK |
585 | entry->ebx = sigptr[0]; |
586 | entry->ecx = sigptr[1]; | |
587 | entry->edx = sigptr[2]; | |
588 | break; | |
589 | } | |
590 | case KVM_CPUID_FEATURES: | |
591 | entry->eax = (1 << KVM_FEATURE_CLOCKSOURCE) | | |
592 | (1 << KVM_FEATURE_NOP_IO_DELAY) | | |
593 | (1 << KVM_FEATURE_CLOCKSOURCE2) | | |
594 | (1 << KVM_FEATURE_ASYNC_PF) | | |
ae7a2a3f | 595 | (1 << KVM_FEATURE_PV_EOI) | |
6aef266c SV |
596 | (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT) | |
597 | (1 << KVM_FEATURE_PV_UNHALT); | |
00b27a3e AK |
598 | |
599 | if (sched_info_on()) | |
600 | entry->eax |= (1 << KVM_FEATURE_STEAL_TIME); | |
601 | ||
602 | entry->ebx = 0; | |
603 | entry->ecx = 0; | |
604 | entry->edx = 0; | |
605 | break; | |
606 | case 0x80000000: | |
607 | entry->eax = min(entry->eax, 0x8000001a); | |
608 | break; | |
609 | case 0x80000001: | |
e0b18ef7 HH |
610 | entry->edx &= kvm_cpuid_8000_0001_edx_x86_features; |
611 | cpuid_mask(&entry->edx, CPUID_8000_0001_EDX); | |
612 | entry->ecx &= kvm_cpuid_8000_0001_ecx_x86_features; | |
613 | cpuid_mask(&entry->ecx, CPUID_8000_0001_ECX); | |
00b27a3e | 614 | break; |
e4c9a5a1 MT |
615 | case 0x80000007: /* Advanced power management */ |
616 | /* invariant TSC is CPUID.80000007H:EDX[8] */ | |
617 | entry->edx &= (1 << 8); | |
618 | /* mask against host */ | |
619 | entry->edx &= boot_cpu_data.x86_power; | |
620 | entry->eax = entry->ebx = entry->ecx = 0; | |
621 | break; | |
00b27a3e AK |
622 | case 0x80000008: { |
623 | unsigned g_phys_as = (entry->eax >> 16) & 0xff; | |
624 | unsigned virt_as = max((entry->eax >> 8) & 0xff, 48U); | |
625 | unsigned phys_as = entry->eax & 0xff; | |
626 | ||
627 | if (!g_phys_as) | |
628 | g_phys_as = phys_as; | |
629 | entry->eax = g_phys_as | (virt_as << 8); | |
630 | entry->ebx = entry->edx = 0; | |
631 | break; | |
632 | } | |
633 | case 0x80000019: | |
634 | entry->ecx = entry->edx = 0; | |
635 | break; | |
636 | case 0x8000001a: | |
637 | break; | |
638 | case 0x8000001d: | |
639 | break; | |
640 | /*Add support for Centaur's CPUID instruction*/ | |
641 | case 0xC0000000: | |
642 | /*Just support up to 0xC0000004 now*/ | |
643 | entry->eax = min(entry->eax, 0xC0000004); | |
644 | break; | |
645 | case 0xC0000001: | |
e0b18ef7 HH |
646 | entry->edx &= kvm_cpuid_C000_0001_edx_x86_features; |
647 | cpuid_mask(&entry->edx, CPUID_C000_0001_EDX); | |
00b27a3e AK |
648 | break; |
649 | case 3: /* Processor serial number */ | |
650 | case 5: /* MONITOR/MWAIT */ | |
00b27a3e AK |
651 | case 0xC0000002: |
652 | case 0xC0000003: | |
653 | case 0xC0000004: | |
654 | default: | |
655 | entry->eax = entry->ebx = entry->ecx = entry->edx = 0; | |
656 | break; | |
657 | } | |
658 | ||
659 | kvm_x86_ops->set_supported_cpuid(function, entry); | |
660 | ||
831bf664 SL |
661 | r = 0; |
662 | ||
663 | out: | |
00b27a3e | 664 | put_cpu(); |
831bf664 SL |
665 | |
666 | return r; | |
00b27a3e AK |
667 | } |
668 | ||
9c15bb1d BP |
669 | static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 func, |
670 | u32 idx, int *nent, int maxnent, unsigned int type) | |
671 | { | |
672 | if (type == KVM_GET_EMULATED_CPUID) | |
673 | return __do_cpuid_ent_emulated(entry, func, idx, nent, maxnent); | |
674 | ||
675 | return __do_cpuid_ent(entry, func, idx, nent, maxnent); | |
676 | } | |
677 | ||
00b27a3e AK |
678 | #undef F |
679 | ||
831bf664 SL |
680 | struct kvm_cpuid_param { |
681 | u32 func; | |
682 | u32 idx; | |
683 | bool has_leaf_count; | |
326d07cb | 684 | bool (*qualifier)(const struct kvm_cpuid_param *param); |
831bf664 SL |
685 | }; |
686 | ||
326d07cb | 687 | static bool is_centaur_cpu(const struct kvm_cpuid_param *param) |
831bf664 SL |
688 | { |
689 | return boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR; | |
690 | } | |
691 | ||
9c15bb1d BP |
692 | static bool sanity_check_entries(struct kvm_cpuid_entry2 __user *entries, |
693 | __u32 num_entries, unsigned int ioctl_type) | |
694 | { | |
695 | int i; | |
1b2ca422 | 696 | __u32 pad[3]; |
9c15bb1d BP |
697 | |
698 | if (ioctl_type != KVM_GET_EMULATED_CPUID) | |
699 | return false; | |
700 | ||
701 | /* | |
702 | * We want to make sure that ->padding is being passed clean from | |
703 | * userspace in case we want to use it for something in the future. | |
704 | * | |
705 | * Sadly, this wasn't enforced for KVM_GET_SUPPORTED_CPUID and so we | |
706 | * have to give ourselves satisfied only with the emulated side. /me | |
707 | * sheds a tear. | |
708 | */ | |
709 | for (i = 0; i < num_entries; i++) { | |
1b2ca422 BP |
710 | if (copy_from_user(pad, entries[i].padding, sizeof(pad))) |
711 | return true; | |
712 | ||
713 | if (pad[0] || pad[1] || pad[2]) | |
9c15bb1d BP |
714 | return true; |
715 | } | |
716 | return false; | |
717 | } | |
718 | ||
719 | int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid, | |
720 | struct kvm_cpuid_entry2 __user *entries, | |
721 | unsigned int type) | |
00b27a3e AK |
722 | { |
723 | struct kvm_cpuid_entry2 *cpuid_entries; | |
831bf664 | 724 | int limit, nent = 0, r = -E2BIG, i; |
00b27a3e | 725 | u32 func; |
326d07cb | 726 | static const struct kvm_cpuid_param param[] = { |
831bf664 SL |
727 | { .func = 0, .has_leaf_count = true }, |
728 | { .func = 0x80000000, .has_leaf_count = true }, | |
729 | { .func = 0xC0000000, .qualifier = is_centaur_cpu, .has_leaf_count = true }, | |
730 | { .func = KVM_CPUID_SIGNATURE }, | |
731 | { .func = KVM_CPUID_FEATURES }, | |
732 | }; | |
00b27a3e AK |
733 | |
734 | if (cpuid->nent < 1) | |
735 | goto out; | |
736 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) | |
737 | cpuid->nent = KVM_MAX_CPUID_ENTRIES; | |
9c15bb1d BP |
738 | |
739 | if (sanity_check_entries(entries, cpuid->nent, type)) | |
740 | return -EINVAL; | |
741 | ||
00b27a3e | 742 | r = -ENOMEM; |
84cffe49 | 743 | cpuid_entries = vzalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent); |
00b27a3e AK |
744 | if (!cpuid_entries) |
745 | goto out; | |
746 | ||
831bf664 SL |
747 | r = 0; |
748 | for (i = 0; i < ARRAY_SIZE(param); i++) { | |
326d07cb | 749 | const struct kvm_cpuid_param *ent = ¶m[i]; |
00b27a3e | 750 | |
831bf664 SL |
751 | if (ent->qualifier && !ent->qualifier(ent)) |
752 | continue; | |
00b27a3e | 753 | |
831bf664 | 754 | r = do_cpuid_ent(&cpuid_entries[nent], ent->func, ent->idx, |
9c15bb1d | 755 | &nent, cpuid->nent, type); |
00b27a3e | 756 | |
831bf664 | 757 | if (r) |
00b27a3e AK |
758 | goto out_free; |
759 | ||
831bf664 SL |
760 | if (!ent->has_leaf_count) |
761 | continue; | |
762 | ||
00b27a3e | 763 | limit = cpuid_entries[nent - 1].eax; |
831bf664 SL |
764 | for (func = ent->func + 1; func <= limit && nent < cpuid->nent && r == 0; ++func) |
765 | r = do_cpuid_ent(&cpuid_entries[nent], func, ent->idx, | |
9c15bb1d | 766 | &nent, cpuid->nent, type); |
00b27a3e | 767 | |
831bf664 | 768 | if (r) |
00b27a3e AK |
769 | goto out_free; |
770 | } | |
771 | ||
00b27a3e AK |
772 | r = -EFAULT; |
773 | if (copy_to_user(entries, cpuid_entries, | |
774 | nent * sizeof(struct kvm_cpuid_entry2))) | |
775 | goto out_free; | |
776 | cpuid->nent = nent; | |
777 | r = 0; | |
778 | ||
779 | out_free: | |
780 | vfree(cpuid_entries); | |
781 | out: | |
782 | return r; | |
783 | } | |
784 | ||
785 | static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i) | |
786 | { | |
787 | struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i]; | |
a3641631 WL |
788 | struct kvm_cpuid_entry2 *ej; |
789 | int j = i; | |
790 | int nent = vcpu->arch.cpuid_nent; | |
00b27a3e AK |
791 | |
792 | e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT; | |
793 | /* when no next entry is found, the current entry[i] is reselected */ | |
a3641631 WL |
794 | do { |
795 | j = (j + 1) % nent; | |
796 | ej = &vcpu->arch.cpuid_entries[j]; | |
797 | } while (ej->function != e->function); | |
798 | ||
799 | ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT; | |
800 | ||
801 | return j; | |
00b27a3e AK |
802 | } |
803 | ||
804 | /* find an entry with matching function, matching index (if needed), and that | |
805 | * should be read next (if it's stateful) */ | |
806 | static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e, | |
807 | u32 function, u32 index) | |
808 | { | |
809 | if (e->function != function) | |
810 | return 0; | |
811 | if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index) | |
812 | return 0; | |
813 | if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) && | |
814 | !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT)) | |
815 | return 0; | |
816 | return 1; | |
817 | } | |
818 | ||
819 | struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu, | |
820 | u32 function, u32 index) | |
821 | { | |
822 | int i; | |
823 | struct kvm_cpuid_entry2 *best = NULL; | |
824 | ||
825 | for (i = 0; i < vcpu->arch.cpuid_nent; ++i) { | |
826 | struct kvm_cpuid_entry2 *e; | |
827 | ||
828 | e = &vcpu->arch.cpuid_entries[i]; | |
829 | if (is_matching_cpuid_entry(e, function, index)) { | |
830 | if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) | |
831 | move_to_next_stateful_cpuid_entry(vcpu, i); | |
832 | best = e; | |
833 | break; | |
834 | } | |
835 | } | |
836 | return best; | |
837 | } | |
838 | EXPORT_SYMBOL_GPL(kvm_find_cpuid_entry); | |
839 | ||
00b27a3e AK |
840 | /* |
841 | * If no match is found, check whether we exceed the vCPU's limit | |
842 | * and return the content of the highest valid _standard_ leaf instead. | |
843 | * This is to satisfy the CPUID specification. | |
844 | */ | |
845 | static struct kvm_cpuid_entry2* check_cpuid_limit(struct kvm_vcpu *vcpu, | |
846 | u32 function, u32 index) | |
847 | { | |
848 | struct kvm_cpuid_entry2 *maxlevel; | |
849 | ||
850 | maxlevel = kvm_find_cpuid_entry(vcpu, function & 0x80000000, 0); | |
851 | if (!maxlevel || maxlevel->eax >= function) | |
852 | return NULL; | |
853 | if (function & 0x80000000) { | |
854 | maxlevel = kvm_find_cpuid_entry(vcpu, 0, 0); | |
855 | if (!maxlevel) | |
856 | return NULL; | |
857 | } | |
858 | return kvm_find_cpuid_entry(vcpu, maxlevel->eax, index); | |
859 | } | |
860 | ||
e911eb3b YZ |
861 | bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx, |
862 | u32 *ecx, u32 *edx, bool check_limit) | |
00b27a3e | 863 | { |
62046e5a | 864 | u32 function = *eax, index = *ecx; |
00b27a3e | 865 | struct kvm_cpuid_entry2 *best; |
e911eb3b | 866 | bool entry_found = true; |
00b27a3e | 867 | |
00b27a3e AK |
868 | best = kvm_find_cpuid_entry(vcpu, function, index); |
869 | ||
e911eb3b YZ |
870 | if (!best) { |
871 | entry_found = false; | |
872 | if (!check_limit) | |
873 | goto out; | |
874 | ||
00b27a3e | 875 | best = check_cpuid_limit(vcpu, function, index); |
e911eb3b | 876 | } |
00b27a3e | 877 | |
e911eb3b | 878 | out: |
00b27a3e | 879 | if (best) { |
62046e5a AK |
880 | *eax = best->eax; |
881 | *ebx = best->ebx; | |
882 | *ecx = best->ecx; | |
883 | *edx = best->edx; | |
884 | } else | |
885 | *eax = *ebx = *ecx = *edx = 0; | |
e911eb3b YZ |
886 | trace_kvm_cpuid(function, *eax, *ebx, *ecx, *edx, entry_found); |
887 | return entry_found; | |
62046e5a | 888 | } |
66f7b72e | 889 | EXPORT_SYMBOL_GPL(kvm_cpuid); |
62046e5a | 890 | |
6a908b62 | 891 | int kvm_emulate_cpuid(struct kvm_vcpu *vcpu) |
62046e5a | 892 | { |
1e13175b | 893 | u32 eax, ebx, ecx, edx; |
62046e5a | 894 | |
db2336a8 KH |
895 | if (cpuid_fault_enabled(vcpu) && !kvm_require_cpl(vcpu, 0)) |
896 | return 1; | |
897 | ||
1e13175b | 898 | eax = kvm_register_read(vcpu, VCPU_REGS_RAX); |
62046e5a | 899 | ecx = kvm_register_read(vcpu, VCPU_REGS_RCX); |
e911eb3b | 900 | kvm_cpuid(vcpu, &eax, &ebx, &ecx, &edx, true); |
62046e5a AK |
901 | kvm_register_write(vcpu, VCPU_REGS_RAX, eax); |
902 | kvm_register_write(vcpu, VCPU_REGS_RBX, ebx); | |
903 | kvm_register_write(vcpu, VCPU_REGS_RCX, ecx); | |
904 | kvm_register_write(vcpu, VCPU_REGS_RDX, edx); | |
6affcbed | 905 | return kvm_skip_emulated_instruction(vcpu); |
00b27a3e AK |
906 | } |
907 | EXPORT_SYMBOL_GPL(kvm_emulate_cpuid); |