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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> | |
4504b5c9 | 19 | #include <asm/processor.h> |
00b27a3e | 20 | #include <asm/user.h> |
669ebabb | 21 | #include <asm/fpu/xstate.h> |
00b27a3e AK |
22 | #include "cpuid.h" |
23 | #include "lapic.h" | |
24 | #include "mmu.h" | |
25 | #include "trace.h" | |
474a5bb9 | 26 | #include "pmu.h" |
00b27a3e | 27 | |
412a3c41 | 28 | static u32 xstate_required_size(u64 xstate_bv, bool compacted) |
4344ee98 PB |
29 | { |
30 | int feature_bit = 0; | |
31 | u32 ret = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET; | |
32 | ||
d91cab78 | 33 | xstate_bv &= XFEATURE_MASK_EXTEND; |
4344ee98 PB |
34 | while (xstate_bv) { |
35 | if (xstate_bv & 0x1) { | |
412a3c41 | 36 | u32 eax, ebx, ecx, edx, offset; |
4344ee98 | 37 | cpuid_count(0xD, feature_bit, &eax, &ebx, &ecx, &edx); |
412a3c41 PB |
38 | offset = compacted ? ret : ebx; |
39 | ret = max(ret, offset + eax); | |
4344ee98 PB |
40 | } |
41 | ||
42 | xstate_bv >>= 1; | |
43 | feature_bit++; | |
44 | } | |
45 | ||
46 | return ret; | |
47 | } | |
48 | ||
a87036ad PB |
49 | bool kvm_mpx_supported(void) |
50 | { | |
51 | return ((host_xcr0 & (XFEATURE_MASK_BNDREGS | XFEATURE_MASK_BNDCSR)) | |
52 | && kvm_x86_ops->mpx_supported()); | |
53 | } | |
54 | EXPORT_SYMBOL_GPL(kvm_mpx_supported); | |
55 | ||
4ff41732 PB |
56 | u64 kvm_supported_xcr0(void) |
57 | { | |
58 | u64 xcr0 = KVM_SUPPORTED_XCR0 & host_xcr0; | |
59 | ||
a87036ad | 60 | if (!kvm_mpx_supported()) |
d91cab78 | 61 | xcr0 &= ~(XFEATURE_MASK_BNDREGS | XFEATURE_MASK_BNDCSR); |
4ff41732 PB |
62 | |
63 | return xcr0; | |
64 | } | |
65 | ||
5c404cab PB |
66 | #define F(x) bit(X86_FEATURE_##x) |
67 | ||
4504b5c9 LK |
68 | /* These are scattered features in cpufeatures.h. */ |
69 | #define KVM_CPUID_BIT_AVX512_4VNNIW 2 | |
70 | #define KVM_CPUID_BIT_AVX512_4FMAPS 3 | |
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 | ||
c592b573 | 126 | kvm_x86_ops->fpu_activate(vcpu); |
c447e76b | 127 | |
dd598091 NA |
128 | /* |
129 | * The existing code assumes virtual address is 48-bit in the canonical | |
130 | * address checks; exit if it is ever changed. | |
131 | */ | |
132 | best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0); | |
133 | if (best && ((best->eax & 0xff00) >> 8) != 48 && | |
134 | ((best->eax & 0xff00) >> 8) != 0) | |
135 | return -EINVAL; | |
136 | ||
5a4f55cd EK |
137 | /* Update physical-address width */ |
138 | vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu); | |
139 | ||
c6702c9d | 140 | kvm_pmu_refresh(vcpu); |
dd598091 | 141 | return 0; |
00b27a3e AK |
142 | } |
143 | ||
144 | static int is_efer_nx(void) | |
145 | { | |
146 | unsigned long long efer = 0; | |
147 | ||
148 | rdmsrl_safe(MSR_EFER, &efer); | |
149 | return efer & EFER_NX; | |
150 | } | |
151 | ||
152 | static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu) | |
153 | { | |
154 | int i; | |
155 | struct kvm_cpuid_entry2 *e, *entry; | |
156 | ||
157 | entry = NULL; | |
158 | for (i = 0; i < vcpu->arch.cpuid_nent; ++i) { | |
159 | e = &vcpu->arch.cpuid_entries[i]; | |
160 | if (e->function == 0x80000001) { | |
161 | entry = e; | |
162 | break; | |
163 | } | |
164 | } | |
5c404cab PB |
165 | if (entry && (entry->edx & F(NX)) && !is_efer_nx()) { |
166 | entry->edx &= ~F(NX); | |
00b27a3e AK |
167 | printk(KERN_INFO "kvm: guest NX capability removed\n"); |
168 | } | |
169 | } | |
170 | ||
5a4f55cd EK |
171 | int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu) |
172 | { | |
173 | struct kvm_cpuid_entry2 *best; | |
174 | ||
175 | best = kvm_find_cpuid_entry(vcpu, 0x80000000, 0); | |
176 | if (!best || best->eax < 0x80000008) | |
177 | goto not_found; | |
178 | best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0); | |
179 | if (best) | |
180 | return best->eax & 0xff; | |
181 | not_found: | |
182 | return 36; | |
183 | } | |
184 | EXPORT_SYMBOL_GPL(cpuid_query_maxphyaddr); | |
185 | ||
00b27a3e AK |
186 | /* when an old userspace process fills a new kernel module */ |
187 | int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu, | |
188 | struct kvm_cpuid *cpuid, | |
189 | struct kvm_cpuid_entry __user *entries) | |
190 | { | |
191 | int r, i; | |
83676e92 | 192 | struct kvm_cpuid_entry *cpuid_entries = NULL; |
00b27a3e AK |
193 | |
194 | r = -E2BIG; | |
195 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) | |
196 | goto out; | |
197 | r = -ENOMEM; | |
83676e92 PB |
198 | if (cpuid->nent) { |
199 | cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * | |
200 | cpuid->nent); | |
201 | if (!cpuid_entries) | |
202 | goto out; | |
203 | r = -EFAULT; | |
204 | if (copy_from_user(cpuid_entries, entries, | |
205 | cpuid->nent * sizeof(struct kvm_cpuid_entry))) | |
206 | goto out; | |
207 | } | |
00b27a3e AK |
208 | for (i = 0; i < cpuid->nent; i++) { |
209 | vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function; | |
210 | vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax; | |
211 | vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx; | |
212 | vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx; | |
213 | vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx; | |
214 | vcpu->arch.cpuid_entries[i].index = 0; | |
215 | vcpu->arch.cpuid_entries[i].flags = 0; | |
216 | vcpu->arch.cpuid_entries[i].padding[0] = 0; | |
217 | vcpu->arch.cpuid_entries[i].padding[1] = 0; | |
218 | vcpu->arch.cpuid_entries[i].padding[2] = 0; | |
219 | } | |
220 | vcpu->arch.cpuid_nent = cpuid->nent; | |
221 | cpuid_fix_nx_cap(vcpu); | |
00b27a3e AK |
222 | kvm_apic_set_version(vcpu); |
223 | kvm_x86_ops->cpuid_update(vcpu); | |
dd598091 | 224 | r = kvm_update_cpuid(vcpu); |
00b27a3e | 225 | |
00b27a3e | 226 | out: |
83676e92 | 227 | vfree(cpuid_entries); |
00b27a3e AK |
228 | return r; |
229 | } | |
230 | ||
231 | int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu, | |
232 | struct kvm_cpuid2 *cpuid, | |
233 | struct kvm_cpuid_entry2 __user *entries) | |
234 | { | |
235 | int r; | |
236 | ||
237 | r = -E2BIG; | |
238 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) | |
239 | goto out; | |
240 | r = -EFAULT; | |
241 | if (copy_from_user(&vcpu->arch.cpuid_entries, entries, | |
242 | cpuid->nent * sizeof(struct kvm_cpuid_entry2))) | |
243 | goto out; | |
244 | vcpu->arch.cpuid_nent = cpuid->nent; | |
245 | kvm_apic_set_version(vcpu); | |
246 | kvm_x86_ops->cpuid_update(vcpu); | |
dd598091 | 247 | r = kvm_update_cpuid(vcpu); |
00b27a3e AK |
248 | out: |
249 | return r; | |
250 | } | |
251 | ||
252 | int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu, | |
253 | struct kvm_cpuid2 *cpuid, | |
254 | struct kvm_cpuid_entry2 __user *entries) | |
255 | { | |
256 | int r; | |
257 | ||
258 | r = -E2BIG; | |
259 | if (cpuid->nent < vcpu->arch.cpuid_nent) | |
260 | goto out; | |
261 | r = -EFAULT; | |
262 | if (copy_to_user(entries, &vcpu->arch.cpuid_entries, | |
263 | vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2))) | |
264 | goto out; | |
265 | return 0; | |
266 | ||
267 | out: | |
268 | cpuid->nent = vcpu->arch.cpuid_nent; | |
269 | return r; | |
270 | } | |
271 | ||
272 | static void cpuid_mask(u32 *word, int wordnum) | |
273 | { | |
274 | *word &= boot_cpu_data.x86_capability[wordnum]; | |
275 | } | |
276 | ||
277 | static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function, | |
278 | u32 index) | |
279 | { | |
280 | entry->function = function; | |
281 | entry->index = index; | |
282 | cpuid_count(entry->function, entry->index, | |
283 | &entry->eax, &entry->ebx, &entry->ecx, &entry->edx); | |
284 | entry->flags = 0; | |
285 | } | |
286 | ||
9c15bb1d BP |
287 | static int __do_cpuid_ent_emulated(struct kvm_cpuid_entry2 *entry, |
288 | u32 func, u32 index, int *nent, int maxnent) | |
289 | { | |
84cffe49 BP |
290 | switch (func) { |
291 | case 0: | |
292 | entry->eax = 1; /* only one leaf currently */ | |
293 | ++*nent; | |
294 | break; | |
295 | case 1: | |
296 | entry->ecx = F(MOVBE); | |
297 | ++*nent; | |
298 | break; | |
299 | default: | |
300 | break; | |
301 | } | |
302 | ||
303 | entry->function = func; | |
304 | entry->index = index; | |
305 | ||
9c15bb1d BP |
306 | return 0; |
307 | } | |
308 | ||
309 | static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, | |
310 | u32 index, int *nent, int maxnent) | |
00b27a3e | 311 | { |
831bf664 | 312 | int r; |
00b27a3e AK |
313 | unsigned f_nx = is_efer_nx() ? F(NX) : 0; |
314 | #ifdef CONFIG_X86_64 | |
315 | unsigned f_gbpages = (kvm_x86_ops->get_lpage_level() == PT_PDPE_LEVEL) | |
316 | ? F(GBPAGES) : 0; | |
317 | unsigned f_lm = F(LM); | |
318 | #else | |
319 | unsigned f_gbpages = 0; | |
320 | unsigned f_lm = 0; | |
321 | #endif | |
322 | unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0; | |
ad756a16 | 323 | unsigned f_invpcid = kvm_x86_ops->invpcid_supported() ? F(INVPCID) : 0; |
a87036ad | 324 | unsigned f_mpx = kvm_mpx_supported() ? F(MPX) : 0; |
55412b2e | 325 | unsigned f_xsaves = kvm_x86_ops->xsaves_supported() ? F(XSAVES) : 0; |
00b27a3e AK |
326 | |
327 | /* cpuid 1.edx */ | |
e0b18ef7 | 328 | const u32 kvm_cpuid_1_edx_x86_features = |
00b27a3e AK |
329 | F(FPU) | F(VME) | F(DE) | F(PSE) | |
330 | F(TSC) | F(MSR) | F(PAE) | F(MCE) | | |
331 | F(CX8) | F(APIC) | 0 /* Reserved */ | F(SEP) | | |
332 | F(MTRR) | F(PGE) | F(MCA) | F(CMOV) | | |
840d2830 | 333 | F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLUSH) | |
00b27a3e AK |
334 | 0 /* Reserved, DS, ACPI */ | F(MMX) | |
335 | F(FXSR) | F(XMM) | F(XMM2) | F(SELFSNOOP) | | |
336 | 0 /* HTT, TM, Reserved, PBE */; | |
337 | /* cpuid 0x80000001.edx */ | |
e0b18ef7 | 338 | const u32 kvm_cpuid_8000_0001_edx_x86_features = |
00b27a3e AK |
339 | F(FPU) | F(VME) | F(DE) | F(PSE) | |
340 | F(TSC) | F(MSR) | F(PAE) | F(MCE) | | |
341 | F(CX8) | F(APIC) | 0 /* Reserved */ | F(SYSCALL) | | |
342 | F(MTRR) | F(PGE) | F(MCA) | F(CMOV) | | |
343 | F(PAT) | F(PSE36) | 0 /* Reserved */ | | |
344 | f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) | | |
345 | F(FXSR) | F(FXSR_OPT) | f_gbpages | f_rdtscp | | |
346 | 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW); | |
347 | /* cpuid 1.ecx */ | |
e0b18ef7 | 348 | const u32 kvm_cpuid_1_ecx_x86_features = |
87c00572 GS |
349 | /* NOTE: MONITOR (and MWAIT) are emulated as NOP, |
350 | * but *not* advertised to guests via CPUID ! */ | |
00b27a3e AK |
351 | F(XMM3) | F(PCLMULQDQ) | 0 /* DTES64, MONITOR */ | |
352 | 0 /* DS-CPL, VMX, SMX, EST */ | | |
353 | 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ | | |
fb215366 | 354 | F(FMA) | F(CX16) | 0 /* xTPR Update, PDCM */ | |
ad756a16 | 355 | F(PCID) | 0 /* Reserved, DCA */ | F(XMM4_1) | |
00b27a3e AK |
356 | F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) | |
357 | 0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) | | |
358 | F(F16C) | F(RDRAND); | |
359 | /* cpuid 0x80000001.ecx */ | |
e0b18ef7 | 360 | const u32 kvm_cpuid_8000_0001_ecx_x86_features = |
00b27a3e AK |
361 | F(LAHF_LM) | F(CMP_LEGACY) | 0 /*SVM*/ | 0 /* ExtApicSpace */ | |
362 | F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) | | |
2b036c6b | 363 | F(3DNOWPREFETCH) | F(OSVW) | 0 /* IBS */ | F(XOP) | |
00b27a3e AK |
364 | 0 /* SKINIT, WDT, LWP */ | F(FMA4) | F(TBM); |
365 | ||
366 | /* cpuid 0xC0000001.edx */ | |
e0b18ef7 | 367 | const u32 kvm_cpuid_C000_0001_edx_x86_features = |
00b27a3e AK |
368 | F(XSTORE) | F(XSTORE_EN) | F(XCRYPT) | F(XCRYPT_EN) | |
369 | F(ACE2) | F(ACE2_EN) | F(PHE) | F(PHE_EN) | | |
370 | F(PMM) | F(PMM_EN); | |
371 | ||
372 | /* cpuid 7.0.ebx */ | |
e0b18ef7 | 373 | const u32 kvm_cpuid_7_0_ebx_x86_features = |
83c52915 | 374 | F(FSGSBASE) | F(BMI1) | F(HLE) | F(AVX2) | F(SMEP) | |
390bd528 | 375 | F(BMI2) | F(ERMS) | f_invpcid | F(RTM) | f_mpx | F(RDSEED) | |
612263b3 | 376 | F(ADX) | F(SMAP) | F(AVX512F) | F(AVX512PF) | F(AVX512ER) | |
8e3562f6 LK |
377 | F(AVX512CD) | F(CLFLUSHOPT) | F(CLWB) | F(AVX512DQ) | |
378 | F(AVX512BW) | F(AVX512VL); | |
00b27a3e | 379 | |
b65d6e17 | 380 | /* cpuid 0xD.1.eax */ |
e0b18ef7 | 381 | const u32 kvm_cpuid_D_1_eax_x86_features = |
55412b2e | 382 | F(XSAVEOPT) | F(XSAVEC) | F(XGETBV1) | f_xsaves; |
b65d6e17 | 383 | |
b9baba86 HH |
384 | /* cpuid 7.0.ecx*/ |
385 | const u32 kvm_cpuid_7_0_ecx_x86_features = F(PKU) | 0 /*OSPKE*/; | |
386 | ||
4504b5c9 LK |
387 | /* cpuid 7.0.edx*/ |
388 | const u32 kvm_cpuid_7_0_edx_x86_features = | |
389 | KF(AVX512_4VNNIW) | KF(AVX512_4FMAPS); | |
390 | ||
00b27a3e AK |
391 | /* all calls to cpuid_count() should be made on the same cpu */ |
392 | get_cpu(); | |
831bf664 SL |
393 | |
394 | r = -E2BIG; | |
395 | ||
396 | if (*nent >= maxnent) | |
397 | goto out; | |
398 | ||
00b27a3e AK |
399 | do_cpuid_1_ent(entry, function, index); |
400 | ++*nent; | |
401 | ||
402 | switch (function) { | |
403 | case 0: | |
404 | entry->eax = min(entry->eax, (u32)0xd); | |
405 | break; | |
406 | case 1: | |
e0b18ef7 HH |
407 | entry->edx &= kvm_cpuid_1_edx_x86_features; |
408 | cpuid_mask(&entry->edx, CPUID_1_EDX); | |
409 | entry->ecx &= kvm_cpuid_1_ecx_x86_features; | |
410 | cpuid_mask(&entry->ecx, CPUID_1_ECX); | |
00b27a3e AK |
411 | /* we support x2apic emulation even if host does not support |
412 | * it since we emulate x2apic in software */ | |
413 | entry->ecx |= F(X2APIC); | |
414 | break; | |
415 | /* function 2 entries are STATEFUL. That is, repeated cpuid commands | |
416 | * may return different values. This forces us to get_cpu() before | |
417 | * issuing the first command, and also to emulate this annoying behavior | |
418 | * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */ | |
419 | case 2: { | |
420 | int t, times = entry->eax & 0xff; | |
421 | ||
422 | entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; | |
423 | entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT; | |
831bf664 SL |
424 | for (t = 1; t < times; ++t) { |
425 | if (*nent >= maxnent) | |
426 | goto out; | |
427 | ||
00b27a3e AK |
428 | do_cpuid_1_ent(&entry[t], function, 0); |
429 | entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; | |
430 | ++*nent; | |
431 | } | |
432 | break; | |
433 | } | |
434 | /* function 4 has additional index. */ | |
435 | case 4: { | |
436 | int i, cache_type; | |
437 | ||
438 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
439 | /* read more entries until cache_type is zero */ | |
831bf664 SL |
440 | for (i = 1; ; ++i) { |
441 | if (*nent >= maxnent) | |
442 | goto out; | |
443 | ||
00b27a3e AK |
444 | cache_type = entry[i - 1].eax & 0x1f; |
445 | if (!cache_type) | |
446 | break; | |
447 | do_cpuid_1_ent(&entry[i], function, i); | |
448 | entry[i].flags |= | |
449 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
450 | ++*nent; | |
451 | } | |
452 | break; | |
453 | } | |
e453aa0f JK |
454 | case 6: /* Thermal management */ |
455 | entry->eax = 0x4; /* allow ARAT */ | |
456 | entry->ebx = 0; | |
457 | entry->ecx = 0; | |
458 | entry->edx = 0; | |
459 | break; | |
00b27a3e AK |
460 | case 7: { |
461 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
bbbda795 | 462 | /* Mask ebx against host capability word 9 */ |
00b27a3e | 463 | if (index == 0) { |
e0b18ef7 HH |
464 | entry->ebx &= kvm_cpuid_7_0_ebx_x86_features; |
465 | cpuid_mask(&entry->ebx, CPUID_7_0_EBX); | |
ba904635 WA |
466 | // TSC_ADJUST is emulated |
467 | entry->ebx |= F(TSC_ADJUST); | |
b9baba86 HH |
468 | entry->ecx &= kvm_cpuid_7_0_ecx_x86_features; |
469 | cpuid_mask(&entry->ecx, CPUID_7_ECX); | |
470 | /* PKU is not yet implemented for shadow paging. */ | |
471 | if (!tdp_enabled) | |
472 | entry->ecx &= ~F(PKU); | |
4504b5c9 LK |
473 | entry->edx &= kvm_cpuid_7_0_edx_x86_features; |
474 | entry->edx &= get_scattered_cpuid_leaf(7, 0, CPUID_EDX); | |
b9baba86 | 475 | } else { |
00b27a3e | 476 | entry->ebx = 0; |
b9baba86 | 477 | entry->ecx = 0; |
4504b5c9 | 478 | entry->edx = 0; |
b9baba86 | 479 | } |
00b27a3e | 480 | entry->eax = 0; |
00b27a3e AK |
481 | break; |
482 | } | |
483 | case 9: | |
484 | break; | |
a6c06ed1 GN |
485 | case 0xa: { /* Architectural Performance Monitoring */ |
486 | struct x86_pmu_capability cap; | |
487 | union cpuid10_eax eax; | |
488 | union cpuid10_edx edx; | |
489 | ||
490 | perf_get_x86_pmu_capability(&cap); | |
491 | ||
492 | /* | |
493 | * Only support guest architectural pmu on a host | |
494 | * with architectural pmu. | |
495 | */ | |
496 | if (!cap.version) | |
497 | memset(&cap, 0, sizeof(cap)); | |
498 | ||
499 | eax.split.version_id = min(cap.version, 2); | |
500 | eax.split.num_counters = cap.num_counters_gp; | |
501 | eax.split.bit_width = cap.bit_width_gp; | |
502 | eax.split.mask_length = cap.events_mask_len; | |
503 | ||
504 | edx.split.num_counters_fixed = cap.num_counters_fixed; | |
505 | edx.split.bit_width_fixed = cap.bit_width_fixed; | |
506 | edx.split.reserved = 0; | |
507 | ||
508 | entry->eax = eax.full; | |
509 | entry->ebx = cap.events_mask; | |
510 | entry->ecx = 0; | |
511 | entry->edx = edx.full; | |
512 | break; | |
513 | } | |
00b27a3e AK |
514 | /* function 0xb has additional index. */ |
515 | case 0xb: { | |
516 | int i, level_type; | |
517 | ||
518 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
519 | /* read more entries until level_type is zero */ | |
831bf664 SL |
520 | for (i = 1; ; ++i) { |
521 | if (*nent >= maxnent) | |
522 | goto out; | |
523 | ||
00b27a3e AK |
524 | level_type = entry[i - 1].ecx & 0xff00; |
525 | if (!level_type) | |
526 | break; | |
527 | do_cpuid_1_ent(&entry[i], function, i); | |
528 | entry[i].flags |= | |
529 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
530 | ++*nent; | |
531 | } | |
532 | break; | |
533 | } | |
534 | case 0xd: { | |
535 | int idx, i; | |
4ff41732 | 536 | u64 supported = kvm_supported_xcr0(); |
00b27a3e | 537 | |
4ff41732 | 538 | entry->eax &= supported; |
e08e8336 RK |
539 | entry->ebx = xstate_required_size(supported, false); |
540 | entry->ecx = entry->ebx; | |
4ff41732 | 541 | entry->edx &= supported >> 32; |
00b27a3e | 542 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
b65d6e17 PB |
543 | if (!supported) |
544 | break; | |
545 | ||
831bf664 | 546 | for (idx = 1, i = 1; idx < 64; ++idx) { |
4ff41732 | 547 | u64 mask = ((u64)1 << idx); |
831bf664 SL |
548 | if (*nent >= maxnent) |
549 | goto out; | |
550 | ||
00b27a3e | 551 | do_cpuid_1_ent(&entry[i], function, idx); |
412a3c41 | 552 | if (idx == 1) { |
e0b18ef7 | 553 | entry[i].eax &= kvm_cpuid_D_1_eax_x86_features; |
316314ca | 554 | cpuid_mask(&entry[i].eax, CPUID_D_1_EAX); |
412a3c41 PB |
555 | entry[i].ebx = 0; |
556 | if (entry[i].eax & (F(XSAVES)|F(XSAVEC))) | |
557 | entry[i].ebx = | |
558 | xstate_required_size(supported, | |
559 | true); | |
404e0a19 PB |
560 | } else { |
561 | if (entry[i].eax == 0 || !(supported & mask)) | |
562 | continue; | |
563 | if (WARN_ON_ONCE(entry[i].ecx & 1)) | |
564 | continue; | |
565 | } | |
566 | entry[i].ecx = 0; | |
567 | entry[i].edx = 0; | |
00b27a3e AK |
568 | entry[i].flags |= |
569 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
570 | ++*nent; | |
571 | ++i; | |
572 | } | |
573 | break; | |
574 | } | |
575 | case KVM_CPUID_SIGNATURE: { | |
326d07cb MK |
576 | static const char signature[12] = "KVMKVMKVM\0\0"; |
577 | const u32 *sigptr = (const u32 *)signature; | |
57c22e5f | 578 | entry->eax = KVM_CPUID_FEATURES; |
00b27a3e AK |
579 | entry->ebx = sigptr[0]; |
580 | entry->ecx = sigptr[1]; | |
581 | entry->edx = sigptr[2]; | |
582 | break; | |
583 | } | |
584 | case KVM_CPUID_FEATURES: | |
585 | entry->eax = (1 << KVM_FEATURE_CLOCKSOURCE) | | |
586 | (1 << KVM_FEATURE_NOP_IO_DELAY) | | |
587 | (1 << KVM_FEATURE_CLOCKSOURCE2) | | |
588 | (1 << KVM_FEATURE_ASYNC_PF) | | |
ae7a2a3f | 589 | (1 << KVM_FEATURE_PV_EOI) | |
6aef266c SV |
590 | (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT) | |
591 | (1 << KVM_FEATURE_PV_UNHALT); | |
00b27a3e AK |
592 | |
593 | if (sched_info_on()) | |
594 | entry->eax |= (1 << KVM_FEATURE_STEAL_TIME); | |
595 | ||
596 | entry->ebx = 0; | |
597 | entry->ecx = 0; | |
598 | entry->edx = 0; | |
599 | break; | |
600 | case 0x80000000: | |
601 | entry->eax = min(entry->eax, 0x8000001a); | |
602 | break; | |
603 | case 0x80000001: | |
e0b18ef7 HH |
604 | entry->edx &= kvm_cpuid_8000_0001_edx_x86_features; |
605 | cpuid_mask(&entry->edx, CPUID_8000_0001_EDX); | |
606 | entry->ecx &= kvm_cpuid_8000_0001_ecx_x86_features; | |
607 | cpuid_mask(&entry->ecx, CPUID_8000_0001_ECX); | |
00b27a3e | 608 | break; |
e4c9a5a1 MT |
609 | case 0x80000007: /* Advanced power management */ |
610 | /* invariant TSC is CPUID.80000007H:EDX[8] */ | |
611 | entry->edx &= (1 << 8); | |
612 | /* mask against host */ | |
613 | entry->edx &= boot_cpu_data.x86_power; | |
614 | entry->eax = entry->ebx = entry->ecx = 0; | |
615 | break; | |
00b27a3e AK |
616 | case 0x80000008: { |
617 | unsigned g_phys_as = (entry->eax >> 16) & 0xff; | |
618 | unsigned virt_as = max((entry->eax >> 8) & 0xff, 48U); | |
619 | unsigned phys_as = entry->eax & 0xff; | |
620 | ||
621 | if (!g_phys_as) | |
622 | g_phys_as = phys_as; | |
623 | entry->eax = g_phys_as | (virt_as << 8); | |
624 | entry->ebx = entry->edx = 0; | |
625 | break; | |
626 | } | |
627 | case 0x80000019: | |
628 | entry->ecx = entry->edx = 0; | |
629 | break; | |
630 | case 0x8000001a: | |
631 | break; | |
632 | case 0x8000001d: | |
633 | break; | |
634 | /*Add support for Centaur's CPUID instruction*/ | |
635 | case 0xC0000000: | |
636 | /*Just support up to 0xC0000004 now*/ | |
637 | entry->eax = min(entry->eax, 0xC0000004); | |
638 | break; | |
639 | case 0xC0000001: | |
e0b18ef7 HH |
640 | entry->edx &= kvm_cpuid_C000_0001_edx_x86_features; |
641 | cpuid_mask(&entry->edx, CPUID_C000_0001_EDX); | |
00b27a3e AK |
642 | break; |
643 | case 3: /* Processor serial number */ | |
644 | case 5: /* MONITOR/MWAIT */ | |
00b27a3e AK |
645 | case 0xC0000002: |
646 | case 0xC0000003: | |
647 | case 0xC0000004: | |
648 | default: | |
649 | entry->eax = entry->ebx = entry->ecx = entry->edx = 0; | |
650 | break; | |
651 | } | |
652 | ||
653 | kvm_x86_ops->set_supported_cpuid(function, entry); | |
654 | ||
831bf664 SL |
655 | r = 0; |
656 | ||
657 | out: | |
00b27a3e | 658 | put_cpu(); |
831bf664 SL |
659 | |
660 | return r; | |
00b27a3e AK |
661 | } |
662 | ||
9c15bb1d BP |
663 | static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 func, |
664 | u32 idx, int *nent, int maxnent, unsigned int type) | |
665 | { | |
666 | if (type == KVM_GET_EMULATED_CPUID) | |
667 | return __do_cpuid_ent_emulated(entry, func, idx, nent, maxnent); | |
668 | ||
669 | return __do_cpuid_ent(entry, func, idx, nent, maxnent); | |
670 | } | |
671 | ||
00b27a3e AK |
672 | #undef F |
673 | ||
831bf664 SL |
674 | struct kvm_cpuid_param { |
675 | u32 func; | |
676 | u32 idx; | |
677 | bool has_leaf_count; | |
326d07cb | 678 | bool (*qualifier)(const struct kvm_cpuid_param *param); |
831bf664 SL |
679 | }; |
680 | ||
326d07cb | 681 | static bool is_centaur_cpu(const struct kvm_cpuid_param *param) |
831bf664 SL |
682 | { |
683 | return boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR; | |
684 | } | |
685 | ||
9c15bb1d BP |
686 | static bool sanity_check_entries(struct kvm_cpuid_entry2 __user *entries, |
687 | __u32 num_entries, unsigned int ioctl_type) | |
688 | { | |
689 | int i; | |
1b2ca422 | 690 | __u32 pad[3]; |
9c15bb1d BP |
691 | |
692 | if (ioctl_type != KVM_GET_EMULATED_CPUID) | |
693 | return false; | |
694 | ||
695 | /* | |
696 | * We want to make sure that ->padding is being passed clean from | |
697 | * userspace in case we want to use it for something in the future. | |
698 | * | |
699 | * Sadly, this wasn't enforced for KVM_GET_SUPPORTED_CPUID and so we | |
700 | * have to give ourselves satisfied only with the emulated side. /me | |
701 | * sheds a tear. | |
702 | */ | |
703 | for (i = 0; i < num_entries; i++) { | |
1b2ca422 BP |
704 | if (copy_from_user(pad, entries[i].padding, sizeof(pad))) |
705 | return true; | |
706 | ||
707 | if (pad[0] || pad[1] || pad[2]) | |
9c15bb1d BP |
708 | return true; |
709 | } | |
710 | return false; | |
711 | } | |
712 | ||
713 | int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid, | |
714 | struct kvm_cpuid_entry2 __user *entries, | |
715 | unsigned int type) | |
00b27a3e AK |
716 | { |
717 | struct kvm_cpuid_entry2 *cpuid_entries; | |
831bf664 | 718 | int limit, nent = 0, r = -E2BIG, i; |
00b27a3e | 719 | u32 func; |
326d07cb | 720 | static const struct kvm_cpuid_param param[] = { |
831bf664 SL |
721 | { .func = 0, .has_leaf_count = true }, |
722 | { .func = 0x80000000, .has_leaf_count = true }, | |
723 | { .func = 0xC0000000, .qualifier = is_centaur_cpu, .has_leaf_count = true }, | |
724 | { .func = KVM_CPUID_SIGNATURE }, | |
725 | { .func = KVM_CPUID_FEATURES }, | |
726 | }; | |
00b27a3e AK |
727 | |
728 | if (cpuid->nent < 1) | |
729 | goto out; | |
730 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) | |
731 | cpuid->nent = KVM_MAX_CPUID_ENTRIES; | |
9c15bb1d BP |
732 | |
733 | if (sanity_check_entries(entries, cpuid->nent, type)) | |
734 | return -EINVAL; | |
735 | ||
00b27a3e | 736 | r = -ENOMEM; |
84cffe49 | 737 | cpuid_entries = vzalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent); |
00b27a3e AK |
738 | if (!cpuid_entries) |
739 | goto out; | |
740 | ||
831bf664 SL |
741 | r = 0; |
742 | for (i = 0; i < ARRAY_SIZE(param); i++) { | |
326d07cb | 743 | const struct kvm_cpuid_param *ent = ¶m[i]; |
00b27a3e | 744 | |
831bf664 SL |
745 | if (ent->qualifier && !ent->qualifier(ent)) |
746 | continue; | |
00b27a3e | 747 | |
831bf664 | 748 | r = do_cpuid_ent(&cpuid_entries[nent], ent->func, ent->idx, |
9c15bb1d | 749 | &nent, cpuid->nent, type); |
00b27a3e | 750 | |
831bf664 | 751 | if (r) |
00b27a3e AK |
752 | goto out_free; |
753 | ||
831bf664 SL |
754 | if (!ent->has_leaf_count) |
755 | continue; | |
756 | ||
00b27a3e | 757 | limit = cpuid_entries[nent - 1].eax; |
831bf664 SL |
758 | for (func = ent->func + 1; func <= limit && nent < cpuid->nent && r == 0; ++func) |
759 | r = do_cpuid_ent(&cpuid_entries[nent], func, ent->idx, | |
9c15bb1d | 760 | &nent, cpuid->nent, type); |
00b27a3e | 761 | |
831bf664 | 762 | if (r) |
00b27a3e AK |
763 | goto out_free; |
764 | } | |
765 | ||
00b27a3e AK |
766 | r = -EFAULT; |
767 | if (copy_to_user(entries, cpuid_entries, | |
768 | nent * sizeof(struct kvm_cpuid_entry2))) | |
769 | goto out_free; | |
770 | cpuid->nent = nent; | |
771 | r = 0; | |
772 | ||
773 | out_free: | |
774 | vfree(cpuid_entries); | |
775 | out: | |
776 | return r; | |
777 | } | |
778 | ||
779 | static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i) | |
780 | { | |
781 | struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i]; | |
782 | int j, nent = vcpu->arch.cpuid_nent; | |
783 | ||
784 | e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT; | |
785 | /* when no next entry is found, the current entry[i] is reselected */ | |
786 | for (j = i + 1; ; j = (j + 1) % nent) { | |
787 | struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j]; | |
788 | if (ej->function == e->function) { | |
789 | ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT; | |
790 | return j; | |
791 | } | |
792 | } | |
793 | return 0; /* silence gcc, even though control never reaches here */ | |
794 | } | |
795 | ||
796 | /* find an entry with matching function, matching index (if needed), and that | |
797 | * should be read next (if it's stateful) */ | |
798 | static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e, | |
799 | u32 function, u32 index) | |
800 | { | |
801 | if (e->function != function) | |
802 | return 0; | |
803 | if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index) | |
804 | return 0; | |
805 | if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) && | |
806 | !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT)) | |
807 | return 0; | |
808 | return 1; | |
809 | } | |
810 | ||
811 | struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu, | |
812 | u32 function, u32 index) | |
813 | { | |
814 | int i; | |
815 | struct kvm_cpuid_entry2 *best = NULL; | |
816 | ||
817 | for (i = 0; i < vcpu->arch.cpuid_nent; ++i) { | |
818 | struct kvm_cpuid_entry2 *e; | |
819 | ||
820 | e = &vcpu->arch.cpuid_entries[i]; | |
821 | if (is_matching_cpuid_entry(e, function, index)) { | |
822 | if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) | |
823 | move_to_next_stateful_cpuid_entry(vcpu, i); | |
824 | best = e; | |
825 | break; | |
826 | } | |
827 | } | |
828 | return best; | |
829 | } | |
830 | EXPORT_SYMBOL_GPL(kvm_find_cpuid_entry); | |
831 | ||
00b27a3e AK |
832 | /* |
833 | * If no match is found, check whether we exceed the vCPU's limit | |
834 | * and return the content of the highest valid _standard_ leaf instead. | |
835 | * This is to satisfy the CPUID specification. | |
836 | */ | |
837 | static struct kvm_cpuid_entry2* check_cpuid_limit(struct kvm_vcpu *vcpu, | |
838 | u32 function, u32 index) | |
839 | { | |
840 | struct kvm_cpuid_entry2 *maxlevel; | |
841 | ||
842 | maxlevel = kvm_find_cpuid_entry(vcpu, function & 0x80000000, 0); | |
843 | if (!maxlevel || maxlevel->eax >= function) | |
844 | return NULL; | |
845 | if (function & 0x80000000) { | |
846 | maxlevel = kvm_find_cpuid_entry(vcpu, 0, 0); | |
847 | if (!maxlevel) | |
848 | return NULL; | |
849 | } | |
850 | return kvm_find_cpuid_entry(vcpu, maxlevel->eax, index); | |
851 | } | |
852 | ||
62046e5a | 853 | void kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx, u32 *ecx, u32 *edx) |
00b27a3e | 854 | { |
62046e5a | 855 | u32 function = *eax, index = *ecx; |
00b27a3e AK |
856 | struct kvm_cpuid_entry2 *best; |
857 | ||
00b27a3e AK |
858 | best = kvm_find_cpuid_entry(vcpu, function, index); |
859 | ||
860 | if (!best) | |
861 | best = check_cpuid_limit(vcpu, function, index); | |
862 | ||
bc613494 MT |
863 | /* |
864 | * Perfmon not yet supported for L2 guest. | |
865 | */ | |
866 | if (is_guest_mode(vcpu) && function == 0xa) | |
867 | best = NULL; | |
868 | ||
00b27a3e | 869 | if (best) { |
62046e5a AK |
870 | *eax = best->eax; |
871 | *ebx = best->ebx; | |
872 | *ecx = best->ecx; | |
873 | *edx = best->edx; | |
874 | } else | |
875 | *eax = *ebx = *ecx = *edx = 0; | |
a9d4e439 | 876 | trace_kvm_cpuid(function, *eax, *ebx, *ecx, *edx); |
62046e5a | 877 | } |
66f7b72e | 878 | EXPORT_SYMBOL_GPL(kvm_cpuid); |
62046e5a | 879 | |
6a908b62 | 880 | int kvm_emulate_cpuid(struct kvm_vcpu *vcpu) |
62046e5a | 881 | { |
1e13175b | 882 | u32 eax, ebx, ecx, edx; |
62046e5a | 883 | |
1e13175b | 884 | eax = kvm_register_read(vcpu, VCPU_REGS_RAX); |
62046e5a AK |
885 | ecx = kvm_register_read(vcpu, VCPU_REGS_RCX); |
886 | kvm_cpuid(vcpu, &eax, &ebx, &ecx, &edx); | |
887 | kvm_register_write(vcpu, VCPU_REGS_RAX, eax); | |
888 | kvm_register_write(vcpu, VCPU_REGS_RBX, ebx); | |
889 | kvm_register_write(vcpu, VCPU_REGS_RCX, ecx); | |
890 | kvm_register_write(vcpu, VCPU_REGS_RDX, edx); | |
6affcbed | 891 | return kvm_skip_emulated_instruction(vcpu); |
00b27a3e AK |
892 | } |
893 | EXPORT_SYMBOL_GPL(kvm_emulate_cpuid); |