Commit | Line | Data |
---|---|---|
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> | |
16 | #include <linux/module.h> | |
bb5a798a JK |
17 | #include <linux/vmalloc.h> |
18 | #include <linux/uaccess.h> | |
c447e76b LL |
19 | #include <asm/i387.h> /* For use_eager_fpu. Ugh! */ |
20 | #include <asm/fpu-internal.h> /* For use_eager_fpu. Ugh! */ | |
00b27a3e AK |
21 | #include <asm/user.h> |
22 | #include <asm/xsave.h> | |
23 | #include "cpuid.h" | |
24 | #include "lapic.h" | |
25 | #include "mmu.h" | |
26 | #include "trace.h" | |
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 | ||
56c103ec | 33 | xstate_bv &= XSTATE_EXTEND_MASK; |
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 | ||
4ff41732 PB |
49 | u64 kvm_supported_xcr0(void) |
50 | { | |
51 | u64 xcr0 = KVM_SUPPORTED_XCR0 & host_xcr0; | |
52 | ||
93c4adc7 | 53 | if (!kvm_x86_ops->mpx_supported()) |
4ff41732 PB |
54 | xcr0 &= ~(XSTATE_BNDREGS | XSTATE_BNDCSR); |
55 | ||
56 | return xcr0; | |
57 | } | |
58 | ||
5c404cab PB |
59 | #define F(x) bit(X86_FEATURE_##x) |
60 | ||
dd598091 | 61 | int kvm_update_cpuid(struct kvm_vcpu *vcpu) |
00b27a3e AK |
62 | { |
63 | struct kvm_cpuid_entry2 *best; | |
64 | struct kvm_lapic *apic = vcpu->arch.apic; | |
65 | ||
66 | best = kvm_find_cpuid_entry(vcpu, 1, 0); | |
67 | if (!best) | |
dd598091 | 68 | return 0; |
00b27a3e AK |
69 | |
70 | /* Update OSXSAVE bit */ | |
71 | if (cpu_has_xsave && best->function == 0x1) { | |
5c404cab | 72 | best->ecx &= ~F(OSXSAVE); |
00b27a3e | 73 | if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE)) |
5c404cab | 74 | best->ecx |= F(OSXSAVE); |
00b27a3e AK |
75 | } |
76 | ||
77 | if (apic) { | |
5c404cab | 78 | if (best->ecx & F(TSC_DEADLINE_TIMER)) |
00b27a3e AK |
79 | apic->lapic_timer.timer_mode_mask = 3 << 17; |
80 | else | |
81 | apic->lapic_timer.timer_mode_mask = 1 << 17; | |
82 | } | |
f5132b01 | 83 | |
d7876f1b | 84 | best = kvm_find_cpuid_entry(vcpu, 0xD, 0); |
4344ee98 | 85 | if (!best) { |
d7876f1b | 86 | vcpu->arch.guest_supported_xcr0 = 0; |
4344ee98 PB |
87 | vcpu->arch.guest_xstate_size = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET; |
88 | } else { | |
d7876f1b PB |
89 | vcpu->arch.guest_supported_xcr0 = |
90 | (best->eax | ((u64)best->edx << 32)) & | |
4ff41732 | 91 | kvm_supported_xcr0(); |
56c103ec | 92 | vcpu->arch.guest_xstate_size = best->ebx = |
412a3c41 | 93 | xstate_required_size(vcpu->arch.xcr0, false); |
4344ee98 | 94 | } |
d7876f1b | 95 | |
412a3c41 PB |
96 | best = kvm_find_cpuid_entry(vcpu, 0xD, 1); |
97 | if (best && (best->eax & (F(XSAVES) | F(XSAVEC)))) | |
98 | best->ebx = xstate_required_size(vcpu->arch.xcr0, true); | |
99 | ||
a9b4fb7e | 100 | vcpu->arch.eager_fpu = use_eager_fpu() || guest_cpuid_has_mpx(vcpu); |
c447e76b | 101 | |
dd598091 NA |
102 | /* |
103 | * The existing code assumes virtual address is 48-bit in the canonical | |
104 | * address checks; exit if it is ever changed. | |
105 | */ | |
106 | best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0); | |
107 | if (best && ((best->eax & 0xff00) >> 8) != 48 && | |
108 | ((best->eax & 0xff00) >> 8) != 0) | |
109 | return -EINVAL; | |
110 | ||
5a4f55cd EK |
111 | /* Update physical-address width */ |
112 | vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu); | |
113 | ||
f5132b01 | 114 | kvm_pmu_cpuid_update(vcpu); |
dd598091 | 115 | return 0; |
00b27a3e AK |
116 | } |
117 | ||
118 | static int is_efer_nx(void) | |
119 | { | |
120 | unsigned long long efer = 0; | |
121 | ||
122 | rdmsrl_safe(MSR_EFER, &efer); | |
123 | return efer & EFER_NX; | |
124 | } | |
125 | ||
126 | static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu) | |
127 | { | |
128 | int i; | |
129 | struct kvm_cpuid_entry2 *e, *entry; | |
130 | ||
131 | entry = NULL; | |
132 | for (i = 0; i < vcpu->arch.cpuid_nent; ++i) { | |
133 | e = &vcpu->arch.cpuid_entries[i]; | |
134 | if (e->function == 0x80000001) { | |
135 | entry = e; | |
136 | break; | |
137 | } | |
138 | } | |
5c404cab PB |
139 | if (entry && (entry->edx & F(NX)) && !is_efer_nx()) { |
140 | entry->edx &= ~F(NX); | |
00b27a3e AK |
141 | printk(KERN_INFO "kvm: guest NX capability removed\n"); |
142 | } | |
143 | } | |
144 | ||
5a4f55cd EK |
145 | int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu) |
146 | { | |
147 | struct kvm_cpuid_entry2 *best; | |
148 | ||
149 | best = kvm_find_cpuid_entry(vcpu, 0x80000000, 0); | |
150 | if (!best || best->eax < 0x80000008) | |
151 | goto not_found; | |
152 | best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0); | |
153 | if (best) | |
154 | return best->eax & 0xff; | |
155 | not_found: | |
156 | return 36; | |
157 | } | |
158 | EXPORT_SYMBOL_GPL(cpuid_query_maxphyaddr); | |
159 | ||
00b27a3e AK |
160 | /* when an old userspace process fills a new kernel module */ |
161 | int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu, | |
162 | struct kvm_cpuid *cpuid, | |
163 | struct kvm_cpuid_entry __user *entries) | |
164 | { | |
165 | int r, i; | |
166 | struct kvm_cpuid_entry *cpuid_entries; | |
167 | ||
168 | r = -E2BIG; | |
169 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) | |
170 | goto out; | |
171 | r = -ENOMEM; | |
172 | cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent); | |
173 | if (!cpuid_entries) | |
174 | goto out; | |
175 | r = -EFAULT; | |
176 | if (copy_from_user(cpuid_entries, entries, | |
177 | cpuid->nent * sizeof(struct kvm_cpuid_entry))) | |
178 | goto out_free; | |
179 | for (i = 0; i < cpuid->nent; i++) { | |
180 | vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function; | |
181 | vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax; | |
182 | vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx; | |
183 | vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx; | |
184 | vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx; | |
185 | vcpu->arch.cpuid_entries[i].index = 0; | |
186 | vcpu->arch.cpuid_entries[i].flags = 0; | |
187 | vcpu->arch.cpuid_entries[i].padding[0] = 0; | |
188 | vcpu->arch.cpuid_entries[i].padding[1] = 0; | |
189 | vcpu->arch.cpuid_entries[i].padding[2] = 0; | |
190 | } | |
191 | vcpu->arch.cpuid_nent = cpuid->nent; | |
192 | cpuid_fix_nx_cap(vcpu); | |
00b27a3e AK |
193 | kvm_apic_set_version(vcpu); |
194 | kvm_x86_ops->cpuid_update(vcpu); | |
dd598091 | 195 | r = kvm_update_cpuid(vcpu); |
00b27a3e AK |
196 | |
197 | out_free: | |
198 | vfree(cpuid_entries); | |
199 | out: | |
200 | return r; | |
201 | } | |
202 | ||
203 | int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu, | |
204 | struct kvm_cpuid2 *cpuid, | |
205 | struct kvm_cpuid_entry2 __user *entries) | |
206 | { | |
207 | int r; | |
208 | ||
209 | r = -E2BIG; | |
210 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) | |
211 | goto out; | |
212 | r = -EFAULT; | |
213 | if (copy_from_user(&vcpu->arch.cpuid_entries, entries, | |
214 | cpuid->nent * sizeof(struct kvm_cpuid_entry2))) | |
215 | goto out; | |
216 | vcpu->arch.cpuid_nent = cpuid->nent; | |
217 | kvm_apic_set_version(vcpu); | |
218 | kvm_x86_ops->cpuid_update(vcpu); | |
dd598091 | 219 | r = kvm_update_cpuid(vcpu); |
00b27a3e AK |
220 | out: |
221 | return r; | |
222 | } | |
223 | ||
224 | int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu, | |
225 | struct kvm_cpuid2 *cpuid, | |
226 | struct kvm_cpuid_entry2 __user *entries) | |
227 | { | |
228 | int r; | |
229 | ||
230 | r = -E2BIG; | |
231 | if (cpuid->nent < vcpu->arch.cpuid_nent) | |
232 | goto out; | |
233 | r = -EFAULT; | |
234 | if (copy_to_user(entries, &vcpu->arch.cpuid_entries, | |
235 | vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2))) | |
236 | goto out; | |
237 | return 0; | |
238 | ||
239 | out: | |
240 | cpuid->nent = vcpu->arch.cpuid_nent; | |
241 | return r; | |
242 | } | |
243 | ||
244 | static void cpuid_mask(u32 *word, int wordnum) | |
245 | { | |
246 | *word &= boot_cpu_data.x86_capability[wordnum]; | |
247 | } | |
248 | ||
249 | static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function, | |
250 | u32 index) | |
251 | { | |
252 | entry->function = function; | |
253 | entry->index = index; | |
254 | cpuid_count(entry->function, entry->index, | |
255 | &entry->eax, &entry->ebx, &entry->ecx, &entry->edx); | |
256 | entry->flags = 0; | |
257 | } | |
258 | ||
9c15bb1d BP |
259 | static int __do_cpuid_ent_emulated(struct kvm_cpuid_entry2 *entry, |
260 | u32 func, u32 index, int *nent, int maxnent) | |
261 | { | |
84cffe49 BP |
262 | switch (func) { |
263 | case 0: | |
264 | entry->eax = 1; /* only one leaf currently */ | |
265 | ++*nent; | |
266 | break; | |
267 | case 1: | |
268 | entry->ecx = F(MOVBE); | |
269 | ++*nent; | |
270 | break; | |
271 | default: | |
272 | break; | |
273 | } | |
274 | ||
275 | entry->function = func; | |
276 | entry->index = index; | |
277 | ||
9c15bb1d BP |
278 | return 0; |
279 | } | |
280 | ||
281 | static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, | |
282 | u32 index, int *nent, int maxnent) | |
00b27a3e | 283 | { |
831bf664 | 284 | int r; |
00b27a3e AK |
285 | unsigned f_nx = is_efer_nx() ? F(NX) : 0; |
286 | #ifdef CONFIG_X86_64 | |
287 | unsigned f_gbpages = (kvm_x86_ops->get_lpage_level() == PT_PDPE_LEVEL) | |
288 | ? F(GBPAGES) : 0; | |
289 | unsigned f_lm = F(LM); | |
290 | #else | |
291 | unsigned f_gbpages = 0; | |
292 | unsigned f_lm = 0; | |
293 | #endif | |
294 | unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0; | |
ad756a16 | 295 | unsigned f_invpcid = kvm_x86_ops->invpcid_supported() ? F(INVPCID) : 0; |
93c4adc7 | 296 | unsigned f_mpx = kvm_x86_ops->mpx_supported() ? F(MPX) : 0; |
55412b2e | 297 | unsigned f_xsaves = kvm_x86_ops->xsaves_supported() ? F(XSAVES) : 0; |
00b27a3e AK |
298 | |
299 | /* cpuid 1.edx */ | |
300 | const u32 kvm_supported_word0_x86_features = | |
301 | F(FPU) | F(VME) | F(DE) | F(PSE) | | |
302 | F(TSC) | F(MSR) | F(PAE) | F(MCE) | | |
303 | F(CX8) | F(APIC) | 0 /* Reserved */ | F(SEP) | | |
304 | F(MTRR) | F(PGE) | F(MCA) | F(CMOV) | | |
840d2830 | 305 | F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLUSH) | |
00b27a3e AK |
306 | 0 /* Reserved, DS, ACPI */ | F(MMX) | |
307 | F(FXSR) | F(XMM) | F(XMM2) | F(SELFSNOOP) | | |
308 | 0 /* HTT, TM, Reserved, PBE */; | |
309 | /* cpuid 0x80000001.edx */ | |
310 | const u32 kvm_supported_word1_x86_features = | |
311 | F(FPU) | F(VME) | F(DE) | F(PSE) | | |
312 | F(TSC) | F(MSR) | F(PAE) | F(MCE) | | |
313 | F(CX8) | F(APIC) | 0 /* Reserved */ | F(SYSCALL) | | |
314 | F(MTRR) | F(PGE) | F(MCA) | F(CMOV) | | |
315 | F(PAT) | F(PSE36) | 0 /* Reserved */ | | |
316 | f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) | | |
317 | F(FXSR) | F(FXSR_OPT) | f_gbpages | f_rdtscp | | |
318 | 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW); | |
319 | /* cpuid 1.ecx */ | |
320 | const u32 kvm_supported_word4_x86_features = | |
87c00572 GS |
321 | /* NOTE: MONITOR (and MWAIT) are emulated as NOP, |
322 | * but *not* advertised to guests via CPUID ! */ | |
00b27a3e AK |
323 | F(XMM3) | F(PCLMULQDQ) | 0 /* DTES64, MONITOR */ | |
324 | 0 /* DS-CPL, VMX, SMX, EST */ | | |
325 | 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ | | |
fb215366 | 326 | F(FMA) | F(CX16) | 0 /* xTPR Update, PDCM */ | |
ad756a16 | 327 | F(PCID) | 0 /* Reserved, DCA */ | F(XMM4_1) | |
00b27a3e AK |
328 | F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) | |
329 | 0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) | | |
330 | F(F16C) | F(RDRAND); | |
331 | /* cpuid 0x80000001.ecx */ | |
332 | const u32 kvm_supported_word6_x86_features = | |
333 | F(LAHF_LM) | F(CMP_LEGACY) | 0 /*SVM*/ | 0 /* ExtApicSpace */ | | |
334 | F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) | | |
2b036c6b | 335 | F(3DNOWPREFETCH) | F(OSVW) | 0 /* IBS */ | F(XOP) | |
00b27a3e AK |
336 | 0 /* SKINIT, WDT, LWP */ | F(FMA4) | F(TBM); |
337 | ||
338 | /* cpuid 0xC0000001.edx */ | |
339 | const u32 kvm_supported_word5_x86_features = | |
340 | F(XSTORE) | F(XSTORE_EN) | F(XCRYPT) | F(XCRYPT_EN) | | |
341 | F(ACE2) | F(ACE2_EN) | F(PHE) | F(PHE_EN) | | |
342 | F(PMM) | F(PMM_EN); | |
343 | ||
344 | /* cpuid 7.0.ebx */ | |
345 | const u32 kvm_supported_word9_x86_features = | |
83c52915 | 346 | F(FSGSBASE) | F(BMI1) | F(HLE) | F(AVX2) | F(SMEP) | |
390bd528 | 347 | F(BMI2) | F(ERMS) | f_invpcid | F(RTM) | f_mpx | F(RDSEED) | |
612263b3 CP |
348 | F(ADX) | F(SMAP) | F(AVX512F) | F(AVX512PF) | F(AVX512ER) | |
349 | F(AVX512CD); | |
00b27a3e | 350 | |
b65d6e17 PB |
351 | /* cpuid 0xD.1.eax */ |
352 | const u32 kvm_supported_word10_x86_features = | |
55412b2e | 353 | F(XSAVEOPT) | F(XSAVEC) | F(XGETBV1) | f_xsaves; |
b65d6e17 | 354 | |
00b27a3e AK |
355 | /* all calls to cpuid_count() should be made on the same cpu */ |
356 | get_cpu(); | |
831bf664 SL |
357 | |
358 | r = -E2BIG; | |
359 | ||
360 | if (*nent >= maxnent) | |
361 | goto out; | |
362 | ||
00b27a3e AK |
363 | do_cpuid_1_ent(entry, function, index); |
364 | ++*nent; | |
365 | ||
366 | switch (function) { | |
367 | case 0: | |
368 | entry->eax = min(entry->eax, (u32)0xd); | |
369 | break; | |
370 | case 1: | |
371 | entry->edx &= kvm_supported_word0_x86_features; | |
372 | cpuid_mask(&entry->edx, 0); | |
373 | entry->ecx &= kvm_supported_word4_x86_features; | |
374 | cpuid_mask(&entry->ecx, 4); | |
375 | /* we support x2apic emulation even if host does not support | |
376 | * it since we emulate x2apic in software */ | |
377 | entry->ecx |= F(X2APIC); | |
378 | break; | |
379 | /* function 2 entries are STATEFUL. That is, repeated cpuid commands | |
380 | * may return different values. This forces us to get_cpu() before | |
381 | * issuing the first command, and also to emulate this annoying behavior | |
382 | * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */ | |
383 | case 2: { | |
384 | int t, times = entry->eax & 0xff; | |
385 | ||
386 | entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; | |
387 | entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT; | |
831bf664 SL |
388 | for (t = 1; t < times; ++t) { |
389 | if (*nent >= maxnent) | |
390 | goto out; | |
391 | ||
00b27a3e AK |
392 | do_cpuid_1_ent(&entry[t], function, 0); |
393 | entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; | |
394 | ++*nent; | |
395 | } | |
396 | break; | |
397 | } | |
398 | /* function 4 has additional index. */ | |
399 | case 4: { | |
400 | int i, cache_type; | |
401 | ||
402 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
403 | /* read more entries until cache_type is zero */ | |
831bf664 SL |
404 | for (i = 1; ; ++i) { |
405 | if (*nent >= maxnent) | |
406 | goto out; | |
407 | ||
00b27a3e AK |
408 | cache_type = entry[i - 1].eax & 0x1f; |
409 | if (!cache_type) | |
410 | break; | |
411 | do_cpuid_1_ent(&entry[i], function, i); | |
412 | entry[i].flags |= | |
413 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
414 | ++*nent; | |
415 | } | |
416 | break; | |
417 | } | |
418 | case 7: { | |
419 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
bbbda795 | 420 | /* Mask ebx against host capability word 9 */ |
00b27a3e AK |
421 | if (index == 0) { |
422 | entry->ebx &= kvm_supported_word9_x86_features; | |
423 | cpuid_mask(&entry->ebx, 9); | |
ba904635 WA |
424 | // TSC_ADJUST is emulated |
425 | entry->ebx |= F(TSC_ADJUST); | |
00b27a3e AK |
426 | } else |
427 | entry->ebx = 0; | |
428 | entry->eax = 0; | |
429 | entry->ecx = 0; | |
430 | entry->edx = 0; | |
431 | break; | |
432 | } | |
433 | case 9: | |
434 | break; | |
a6c06ed1 GN |
435 | case 0xa: { /* Architectural Performance Monitoring */ |
436 | struct x86_pmu_capability cap; | |
437 | union cpuid10_eax eax; | |
438 | union cpuid10_edx edx; | |
439 | ||
440 | perf_get_x86_pmu_capability(&cap); | |
441 | ||
442 | /* | |
443 | * Only support guest architectural pmu on a host | |
444 | * with architectural pmu. | |
445 | */ | |
446 | if (!cap.version) | |
447 | memset(&cap, 0, sizeof(cap)); | |
448 | ||
449 | eax.split.version_id = min(cap.version, 2); | |
450 | eax.split.num_counters = cap.num_counters_gp; | |
451 | eax.split.bit_width = cap.bit_width_gp; | |
452 | eax.split.mask_length = cap.events_mask_len; | |
453 | ||
454 | edx.split.num_counters_fixed = cap.num_counters_fixed; | |
455 | edx.split.bit_width_fixed = cap.bit_width_fixed; | |
456 | edx.split.reserved = 0; | |
457 | ||
458 | entry->eax = eax.full; | |
459 | entry->ebx = cap.events_mask; | |
460 | entry->ecx = 0; | |
461 | entry->edx = edx.full; | |
462 | break; | |
463 | } | |
00b27a3e AK |
464 | /* function 0xb has additional index. */ |
465 | case 0xb: { | |
466 | int i, level_type; | |
467 | ||
468 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
469 | /* read more entries until level_type is zero */ | |
831bf664 SL |
470 | for (i = 1; ; ++i) { |
471 | if (*nent >= maxnent) | |
472 | goto out; | |
473 | ||
00b27a3e AK |
474 | level_type = entry[i - 1].ecx & 0xff00; |
475 | if (!level_type) | |
476 | break; | |
477 | do_cpuid_1_ent(&entry[i], function, i); | |
478 | entry[i].flags |= | |
479 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
480 | ++*nent; | |
481 | } | |
482 | break; | |
483 | } | |
484 | case 0xd: { | |
485 | int idx, i; | |
4ff41732 | 486 | u64 supported = kvm_supported_xcr0(); |
00b27a3e | 487 | |
4ff41732 | 488 | entry->eax &= supported; |
e08e8336 RK |
489 | entry->ebx = xstate_required_size(supported, false); |
490 | entry->ecx = entry->ebx; | |
4ff41732 | 491 | entry->edx &= supported >> 32; |
00b27a3e | 492 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
b65d6e17 PB |
493 | if (!supported) |
494 | break; | |
495 | ||
831bf664 | 496 | for (idx = 1, i = 1; idx < 64; ++idx) { |
4ff41732 | 497 | u64 mask = ((u64)1 << idx); |
831bf664 SL |
498 | if (*nent >= maxnent) |
499 | goto out; | |
500 | ||
00b27a3e | 501 | do_cpuid_1_ent(&entry[i], function, idx); |
412a3c41 | 502 | if (idx == 1) { |
b65d6e17 | 503 | entry[i].eax &= kvm_supported_word10_x86_features; |
412a3c41 PB |
504 | entry[i].ebx = 0; |
505 | if (entry[i].eax & (F(XSAVES)|F(XSAVEC))) | |
506 | entry[i].ebx = | |
507 | xstate_required_size(supported, | |
508 | true); | |
404e0a19 PB |
509 | } else { |
510 | if (entry[i].eax == 0 || !(supported & mask)) | |
511 | continue; | |
512 | if (WARN_ON_ONCE(entry[i].ecx & 1)) | |
513 | continue; | |
514 | } | |
515 | entry[i].ecx = 0; | |
516 | entry[i].edx = 0; | |
00b27a3e AK |
517 | entry[i].flags |= |
518 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
519 | ++*nent; | |
520 | ++i; | |
521 | } | |
522 | break; | |
523 | } | |
524 | case KVM_CPUID_SIGNATURE: { | |
326d07cb MK |
525 | static const char signature[12] = "KVMKVMKVM\0\0"; |
526 | const u32 *sigptr = (const u32 *)signature; | |
57c22e5f | 527 | entry->eax = KVM_CPUID_FEATURES; |
00b27a3e AK |
528 | entry->ebx = sigptr[0]; |
529 | entry->ecx = sigptr[1]; | |
530 | entry->edx = sigptr[2]; | |
531 | break; | |
532 | } | |
533 | case KVM_CPUID_FEATURES: | |
534 | entry->eax = (1 << KVM_FEATURE_CLOCKSOURCE) | | |
535 | (1 << KVM_FEATURE_NOP_IO_DELAY) | | |
536 | (1 << KVM_FEATURE_CLOCKSOURCE2) | | |
537 | (1 << KVM_FEATURE_ASYNC_PF) | | |
ae7a2a3f | 538 | (1 << KVM_FEATURE_PV_EOI) | |
6aef266c SV |
539 | (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT) | |
540 | (1 << KVM_FEATURE_PV_UNHALT); | |
00b27a3e AK |
541 | |
542 | if (sched_info_on()) | |
543 | entry->eax |= (1 << KVM_FEATURE_STEAL_TIME); | |
544 | ||
545 | entry->ebx = 0; | |
546 | entry->ecx = 0; | |
547 | entry->edx = 0; | |
548 | break; | |
549 | case 0x80000000: | |
550 | entry->eax = min(entry->eax, 0x8000001a); | |
551 | break; | |
552 | case 0x80000001: | |
553 | entry->edx &= kvm_supported_word1_x86_features; | |
554 | cpuid_mask(&entry->edx, 1); | |
555 | entry->ecx &= kvm_supported_word6_x86_features; | |
556 | cpuid_mask(&entry->ecx, 6); | |
557 | break; | |
e4c9a5a1 MT |
558 | case 0x80000007: /* Advanced power management */ |
559 | /* invariant TSC is CPUID.80000007H:EDX[8] */ | |
560 | entry->edx &= (1 << 8); | |
561 | /* mask against host */ | |
562 | entry->edx &= boot_cpu_data.x86_power; | |
563 | entry->eax = entry->ebx = entry->ecx = 0; | |
564 | break; | |
00b27a3e AK |
565 | case 0x80000008: { |
566 | unsigned g_phys_as = (entry->eax >> 16) & 0xff; | |
567 | unsigned virt_as = max((entry->eax >> 8) & 0xff, 48U); | |
568 | unsigned phys_as = entry->eax & 0xff; | |
569 | ||
570 | if (!g_phys_as) | |
571 | g_phys_as = phys_as; | |
572 | entry->eax = g_phys_as | (virt_as << 8); | |
573 | entry->ebx = entry->edx = 0; | |
574 | break; | |
575 | } | |
576 | case 0x80000019: | |
577 | entry->ecx = entry->edx = 0; | |
578 | break; | |
579 | case 0x8000001a: | |
580 | break; | |
581 | case 0x8000001d: | |
582 | break; | |
583 | /*Add support for Centaur's CPUID instruction*/ | |
584 | case 0xC0000000: | |
585 | /*Just support up to 0xC0000004 now*/ | |
586 | entry->eax = min(entry->eax, 0xC0000004); | |
587 | break; | |
588 | case 0xC0000001: | |
589 | entry->edx &= kvm_supported_word5_x86_features; | |
590 | cpuid_mask(&entry->edx, 5); | |
591 | break; | |
592 | case 3: /* Processor serial number */ | |
593 | case 5: /* MONITOR/MWAIT */ | |
594 | case 6: /* Thermal management */ | |
00b27a3e AK |
595 | case 0xC0000002: |
596 | case 0xC0000003: | |
597 | case 0xC0000004: | |
598 | default: | |
599 | entry->eax = entry->ebx = entry->ecx = entry->edx = 0; | |
600 | break; | |
601 | } | |
602 | ||
603 | kvm_x86_ops->set_supported_cpuid(function, entry); | |
604 | ||
831bf664 SL |
605 | r = 0; |
606 | ||
607 | out: | |
00b27a3e | 608 | put_cpu(); |
831bf664 SL |
609 | |
610 | return r; | |
00b27a3e AK |
611 | } |
612 | ||
9c15bb1d BP |
613 | static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 func, |
614 | u32 idx, int *nent, int maxnent, unsigned int type) | |
615 | { | |
616 | if (type == KVM_GET_EMULATED_CPUID) | |
617 | return __do_cpuid_ent_emulated(entry, func, idx, nent, maxnent); | |
618 | ||
619 | return __do_cpuid_ent(entry, func, idx, nent, maxnent); | |
620 | } | |
621 | ||
00b27a3e AK |
622 | #undef F |
623 | ||
831bf664 SL |
624 | struct kvm_cpuid_param { |
625 | u32 func; | |
626 | u32 idx; | |
627 | bool has_leaf_count; | |
326d07cb | 628 | bool (*qualifier)(const struct kvm_cpuid_param *param); |
831bf664 SL |
629 | }; |
630 | ||
326d07cb | 631 | static bool is_centaur_cpu(const struct kvm_cpuid_param *param) |
831bf664 SL |
632 | { |
633 | return boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR; | |
634 | } | |
635 | ||
9c15bb1d BP |
636 | static bool sanity_check_entries(struct kvm_cpuid_entry2 __user *entries, |
637 | __u32 num_entries, unsigned int ioctl_type) | |
638 | { | |
639 | int i; | |
1b2ca422 | 640 | __u32 pad[3]; |
9c15bb1d BP |
641 | |
642 | if (ioctl_type != KVM_GET_EMULATED_CPUID) | |
643 | return false; | |
644 | ||
645 | /* | |
646 | * We want to make sure that ->padding is being passed clean from | |
647 | * userspace in case we want to use it for something in the future. | |
648 | * | |
649 | * Sadly, this wasn't enforced for KVM_GET_SUPPORTED_CPUID and so we | |
650 | * have to give ourselves satisfied only with the emulated side. /me | |
651 | * sheds a tear. | |
652 | */ | |
653 | for (i = 0; i < num_entries; i++) { | |
1b2ca422 BP |
654 | if (copy_from_user(pad, entries[i].padding, sizeof(pad))) |
655 | return true; | |
656 | ||
657 | if (pad[0] || pad[1] || pad[2]) | |
9c15bb1d BP |
658 | return true; |
659 | } | |
660 | return false; | |
661 | } | |
662 | ||
663 | int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid, | |
664 | struct kvm_cpuid_entry2 __user *entries, | |
665 | unsigned int type) | |
00b27a3e AK |
666 | { |
667 | struct kvm_cpuid_entry2 *cpuid_entries; | |
831bf664 | 668 | int limit, nent = 0, r = -E2BIG, i; |
00b27a3e | 669 | u32 func; |
326d07cb | 670 | static const struct kvm_cpuid_param param[] = { |
831bf664 SL |
671 | { .func = 0, .has_leaf_count = true }, |
672 | { .func = 0x80000000, .has_leaf_count = true }, | |
673 | { .func = 0xC0000000, .qualifier = is_centaur_cpu, .has_leaf_count = true }, | |
674 | { .func = KVM_CPUID_SIGNATURE }, | |
675 | { .func = KVM_CPUID_FEATURES }, | |
676 | }; | |
00b27a3e AK |
677 | |
678 | if (cpuid->nent < 1) | |
679 | goto out; | |
680 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) | |
681 | cpuid->nent = KVM_MAX_CPUID_ENTRIES; | |
9c15bb1d BP |
682 | |
683 | if (sanity_check_entries(entries, cpuid->nent, type)) | |
684 | return -EINVAL; | |
685 | ||
00b27a3e | 686 | r = -ENOMEM; |
84cffe49 | 687 | cpuid_entries = vzalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent); |
00b27a3e AK |
688 | if (!cpuid_entries) |
689 | goto out; | |
690 | ||
831bf664 SL |
691 | r = 0; |
692 | for (i = 0; i < ARRAY_SIZE(param); i++) { | |
326d07cb | 693 | const struct kvm_cpuid_param *ent = ¶m[i]; |
00b27a3e | 694 | |
831bf664 SL |
695 | if (ent->qualifier && !ent->qualifier(ent)) |
696 | continue; | |
00b27a3e | 697 | |
831bf664 | 698 | r = do_cpuid_ent(&cpuid_entries[nent], ent->func, ent->idx, |
9c15bb1d | 699 | &nent, cpuid->nent, type); |
00b27a3e | 700 | |
831bf664 | 701 | if (r) |
00b27a3e AK |
702 | goto out_free; |
703 | ||
831bf664 SL |
704 | if (!ent->has_leaf_count) |
705 | continue; | |
706 | ||
00b27a3e | 707 | limit = cpuid_entries[nent - 1].eax; |
831bf664 SL |
708 | for (func = ent->func + 1; func <= limit && nent < cpuid->nent && r == 0; ++func) |
709 | r = do_cpuid_ent(&cpuid_entries[nent], func, ent->idx, | |
9c15bb1d | 710 | &nent, cpuid->nent, type); |
00b27a3e | 711 | |
831bf664 | 712 | if (r) |
00b27a3e AK |
713 | goto out_free; |
714 | } | |
715 | ||
00b27a3e AK |
716 | r = -EFAULT; |
717 | if (copy_to_user(entries, cpuid_entries, | |
718 | nent * sizeof(struct kvm_cpuid_entry2))) | |
719 | goto out_free; | |
720 | cpuid->nent = nent; | |
721 | r = 0; | |
722 | ||
723 | out_free: | |
724 | vfree(cpuid_entries); | |
725 | out: | |
726 | return r; | |
727 | } | |
728 | ||
729 | static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i) | |
730 | { | |
731 | struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i]; | |
732 | int j, nent = vcpu->arch.cpuid_nent; | |
733 | ||
734 | e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT; | |
735 | /* when no next entry is found, the current entry[i] is reselected */ | |
736 | for (j = i + 1; ; j = (j + 1) % nent) { | |
737 | struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j]; | |
738 | if (ej->function == e->function) { | |
739 | ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT; | |
740 | return j; | |
741 | } | |
742 | } | |
743 | return 0; /* silence gcc, even though control never reaches here */ | |
744 | } | |
745 | ||
746 | /* find an entry with matching function, matching index (if needed), and that | |
747 | * should be read next (if it's stateful) */ | |
748 | static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e, | |
749 | u32 function, u32 index) | |
750 | { | |
751 | if (e->function != function) | |
752 | return 0; | |
753 | if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index) | |
754 | return 0; | |
755 | if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) && | |
756 | !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT)) | |
757 | return 0; | |
758 | return 1; | |
759 | } | |
760 | ||
761 | struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu, | |
762 | u32 function, u32 index) | |
763 | { | |
764 | int i; | |
765 | struct kvm_cpuid_entry2 *best = NULL; | |
766 | ||
767 | for (i = 0; i < vcpu->arch.cpuid_nent; ++i) { | |
768 | struct kvm_cpuid_entry2 *e; | |
769 | ||
770 | e = &vcpu->arch.cpuid_entries[i]; | |
771 | if (is_matching_cpuid_entry(e, function, index)) { | |
772 | if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) | |
773 | move_to_next_stateful_cpuid_entry(vcpu, i); | |
774 | best = e; | |
775 | break; | |
776 | } | |
777 | } | |
778 | return best; | |
779 | } | |
780 | EXPORT_SYMBOL_GPL(kvm_find_cpuid_entry); | |
781 | ||
00b27a3e AK |
782 | /* |
783 | * If no match is found, check whether we exceed the vCPU's limit | |
784 | * and return the content of the highest valid _standard_ leaf instead. | |
785 | * This is to satisfy the CPUID specification. | |
786 | */ | |
787 | static struct kvm_cpuid_entry2* check_cpuid_limit(struct kvm_vcpu *vcpu, | |
788 | u32 function, u32 index) | |
789 | { | |
790 | struct kvm_cpuid_entry2 *maxlevel; | |
791 | ||
792 | maxlevel = kvm_find_cpuid_entry(vcpu, function & 0x80000000, 0); | |
793 | if (!maxlevel || maxlevel->eax >= function) | |
794 | return NULL; | |
795 | if (function & 0x80000000) { | |
796 | maxlevel = kvm_find_cpuid_entry(vcpu, 0, 0); | |
797 | if (!maxlevel) | |
798 | return NULL; | |
799 | } | |
800 | return kvm_find_cpuid_entry(vcpu, maxlevel->eax, index); | |
801 | } | |
802 | ||
62046e5a | 803 | void kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx, u32 *ecx, u32 *edx) |
00b27a3e | 804 | { |
62046e5a | 805 | u32 function = *eax, index = *ecx; |
00b27a3e AK |
806 | struct kvm_cpuid_entry2 *best; |
807 | ||
00b27a3e AK |
808 | best = kvm_find_cpuid_entry(vcpu, function, index); |
809 | ||
810 | if (!best) | |
811 | best = check_cpuid_limit(vcpu, function, index); | |
812 | ||
bc613494 MT |
813 | /* |
814 | * Perfmon not yet supported for L2 guest. | |
815 | */ | |
816 | if (is_guest_mode(vcpu) && function == 0xa) | |
817 | best = NULL; | |
818 | ||
00b27a3e | 819 | if (best) { |
62046e5a AK |
820 | *eax = best->eax; |
821 | *ebx = best->ebx; | |
822 | *ecx = best->ecx; | |
823 | *edx = best->edx; | |
824 | } else | |
825 | *eax = *ebx = *ecx = *edx = 0; | |
a9d4e439 | 826 | trace_kvm_cpuid(function, *eax, *ebx, *ecx, *edx); |
62046e5a | 827 | } |
66f7b72e | 828 | EXPORT_SYMBOL_GPL(kvm_cpuid); |
62046e5a AK |
829 | |
830 | void kvm_emulate_cpuid(struct kvm_vcpu *vcpu) | |
831 | { | |
832 | u32 function, eax, ebx, ecx, edx; | |
833 | ||
834 | function = eax = kvm_register_read(vcpu, VCPU_REGS_RAX); | |
835 | ecx = kvm_register_read(vcpu, VCPU_REGS_RCX); | |
836 | kvm_cpuid(vcpu, &eax, &ebx, &ecx, &edx); | |
837 | kvm_register_write(vcpu, VCPU_REGS_RAX, eax); | |
838 | kvm_register_write(vcpu, VCPU_REGS_RBX, ebx); | |
839 | kvm_register_write(vcpu, VCPU_REGS_RCX, ecx); | |
840 | kvm_register_write(vcpu, VCPU_REGS_RDX, edx); | |
00b27a3e | 841 | kvm_x86_ops->skip_emulated_instruction(vcpu); |
00b27a3e AK |
842 | } |
843 | EXPORT_SYMBOL_GPL(kvm_emulate_cpuid); |