Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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> |
Jan Kiszka | bb5a798 | 2011-12-14 17:58:18 +0100 | [diff] [blame] | 17 | #include <linux/vmalloc.h> |
| 18 | #include <linux/uaccess.h> |
Liang Li | c447e76 | 2015-05-21 04:41:25 +0800 | [diff] [blame] | 19 | #include <asm/i387.h> /* For use_eager_fpu. Ugh! */ |
| 20 | #include <asm/fpu-internal.h> /* For use_eager_fpu. Ugh! */ |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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 | |
Paolo Bonzini | 412a3c4 | 2014-12-03 14:38:01 +0100 | [diff] [blame] | 28 | static u32 xstate_required_size(u64 xstate_bv, bool compacted) |
Paolo Bonzini | 4344ee9 | 2013-10-02 16:06:16 +0200 | [diff] [blame] | 29 | { |
| 30 | int feature_bit = 0; |
| 31 | u32 ret = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET; |
| 32 | |
Liu, Jinsong | 56c103e | 2014-02-21 17:39:02 +0000 | [diff] [blame] | 33 | xstate_bv &= XSTATE_EXTEND_MASK; |
Paolo Bonzini | 4344ee9 | 2013-10-02 16:06:16 +0200 | [diff] [blame] | 34 | while (xstate_bv) { |
| 35 | if (xstate_bv & 0x1) { |
Paolo Bonzini | 412a3c4 | 2014-12-03 14:38:01 +0100 | [diff] [blame] | 36 | u32 eax, ebx, ecx, edx, offset; |
Paolo Bonzini | 4344ee9 | 2013-10-02 16:06:16 +0200 | [diff] [blame] | 37 | cpuid_count(0xD, feature_bit, &eax, &ebx, &ecx, &edx); |
Paolo Bonzini | 412a3c4 | 2014-12-03 14:38:01 +0100 | [diff] [blame] | 38 | offset = compacted ? ret : ebx; |
| 39 | ret = max(ret, offset + eax); |
Paolo Bonzini | 4344ee9 | 2013-10-02 16:06:16 +0200 | [diff] [blame] | 40 | } |
| 41 | |
| 42 | xstate_bv >>= 1; |
| 43 | feature_bit++; |
| 44 | } |
| 45 | |
| 46 | return ret; |
| 47 | } |
| 48 | |
Paolo Bonzini | 4ff4173 | 2014-02-24 12:15:16 +0100 | [diff] [blame] | 49 | u64 kvm_supported_xcr0(void) |
| 50 | { |
| 51 | u64 xcr0 = KVM_SUPPORTED_XCR0 & host_xcr0; |
| 52 | |
Paolo Bonzini | 93c4adc | 2014-03-05 23:19:52 +0100 | [diff] [blame] | 53 | if (!kvm_x86_ops->mpx_supported()) |
Paolo Bonzini | 4ff4173 | 2014-02-24 12:15:16 +0100 | [diff] [blame] | 54 | xcr0 &= ~(XSTATE_BNDREGS | XSTATE_BNDCSR); |
| 55 | |
| 56 | return xcr0; |
| 57 | } |
| 58 | |
Paolo Bonzini | 5c404ca | 2014-12-03 14:34:47 +0100 | [diff] [blame] | 59 | #define F(x) bit(X86_FEATURE_##x) |
| 60 | |
Nadav Amit | dd59809 | 2014-09-16 15:10:03 +0300 | [diff] [blame] | 61 | int kvm_update_cpuid(struct kvm_vcpu *vcpu) |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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) |
Nadav Amit | dd59809 | 2014-09-16 15:10:03 +0300 | [diff] [blame] | 68 | return 0; |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 69 | |
| 70 | /* Update OSXSAVE bit */ |
| 71 | if (cpu_has_xsave && best->function == 0x1) { |
Paolo Bonzini | 5c404ca | 2014-12-03 14:34:47 +0100 | [diff] [blame] | 72 | best->ecx &= ~F(OSXSAVE); |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 73 | if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE)) |
Paolo Bonzini | 5c404ca | 2014-12-03 14:34:47 +0100 | [diff] [blame] | 74 | best->ecx |= F(OSXSAVE); |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 75 | } |
| 76 | |
| 77 | if (apic) { |
Paolo Bonzini | 5c404ca | 2014-12-03 14:34:47 +0100 | [diff] [blame] | 78 | if (best->ecx & F(TSC_DEADLINE_TIMER)) |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 79 | apic->lapic_timer.timer_mode_mask = 3 << 17; |
| 80 | else |
| 81 | apic->lapic_timer.timer_mode_mask = 1 << 17; |
| 82 | } |
Gleb Natapov | f5132b0 | 2011-11-10 14:57:22 +0200 | [diff] [blame] | 83 | |
Paolo Bonzini | d7876f1 | 2013-10-02 16:06:15 +0200 | [diff] [blame] | 84 | best = kvm_find_cpuid_entry(vcpu, 0xD, 0); |
Paolo Bonzini | 4344ee9 | 2013-10-02 16:06:16 +0200 | [diff] [blame] | 85 | if (!best) { |
Paolo Bonzini | d7876f1 | 2013-10-02 16:06:15 +0200 | [diff] [blame] | 86 | vcpu->arch.guest_supported_xcr0 = 0; |
Paolo Bonzini | 4344ee9 | 2013-10-02 16:06:16 +0200 | [diff] [blame] | 87 | vcpu->arch.guest_xstate_size = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET; |
| 88 | } else { |
Paolo Bonzini | d7876f1 | 2013-10-02 16:06:15 +0200 | [diff] [blame] | 89 | vcpu->arch.guest_supported_xcr0 = |
| 90 | (best->eax | ((u64)best->edx << 32)) & |
Paolo Bonzini | 4ff4173 | 2014-02-24 12:15:16 +0100 | [diff] [blame] | 91 | kvm_supported_xcr0(); |
Liu, Jinsong | 56c103e | 2014-02-21 17:39:02 +0000 | [diff] [blame] | 92 | vcpu->arch.guest_xstate_size = best->ebx = |
Paolo Bonzini | 412a3c4 | 2014-12-03 14:38:01 +0100 | [diff] [blame] | 93 | xstate_required_size(vcpu->arch.xcr0, false); |
Paolo Bonzini | 4344ee9 | 2013-10-02 16:06:16 +0200 | [diff] [blame] | 94 | } |
Paolo Bonzini | d7876f1 | 2013-10-02 16:06:15 +0200 | [diff] [blame] | 95 | |
Paolo Bonzini | 412a3c4 | 2014-12-03 14:38:01 +0100 | [diff] [blame] | 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 | |
Liang Li | c447e76 | 2015-05-21 04:41:25 +0800 | [diff] [blame] | 100 | vcpu->arch.eager_fpu = guest_cpuid_has_mpx(vcpu); |
| 101 | |
Nadav Amit | dd59809 | 2014-09-16 15:10:03 +0300 | [diff] [blame] | 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 | |
Eugene Korenevsky | 5a4f55c | 2015-03-29 23:56:12 +0300 | [diff] [blame] | 111 | /* Update physical-address width */ |
| 112 | vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu); |
| 113 | |
Gleb Natapov | f5132b0 | 2011-11-10 14:57:22 +0200 | [diff] [blame] | 114 | kvm_pmu_cpuid_update(vcpu); |
Nadav Amit | dd59809 | 2014-09-16 15:10:03 +0300 | [diff] [blame] | 115 | return 0; |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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 | } |
Paolo Bonzini | 5c404ca | 2014-12-03 14:34:47 +0100 | [diff] [blame] | 139 | if (entry && (entry->edx & F(NX)) && !is_efer_nx()) { |
| 140 | entry->edx &= ~F(NX); |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 141 | printk(KERN_INFO "kvm: guest NX capability removed\n"); |
| 142 | } |
| 143 | } |
| 144 | |
Eugene Korenevsky | 5a4f55c | 2015-03-29 23:56:12 +0300 | [diff] [blame] | 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 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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); |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 193 | kvm_apic_set_version(vcpu); |
| 194 | kvm_x86_ops->cpuid_update(vcpu); |
Nadav Amit | dd59809 | 2014-09-16 15:10:03 +0300 | [diff] [blame] | 195 | r = kvm_update_cpuid(vcpu); |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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); |
Nadav Amit | dd59809 | 2014-09-16 15:10:03 +0300 | [diff] [blame] | 219 | r = kvm_update_cpuid(vcpu); |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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 | |
Borislav Petkov | 9c15bb1 | 2013-09-22 16:44:50 +0200 | [diff] [blame] | 259 | static int __do_cpuid_ent_emulated(struct kvm_cpuid_entry2 *entry, |
| 260 | u32 func, u32 index, int *nent, int maxnent) |
| 261 | { |
Borislav Petkov | 84cffe4 | 2013-10-29 12:54:56 +0100 | [diff] [blame] | 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 | |
Borislav Petkov | 9c15bb1 | 2013-09-22 16:44:50 +0200 | [diff] [blame] | 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) |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 283 | { |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 284 | int r; |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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; |
Mao, Junjie | ad756a1 | 2012-07-02 01:18:48 +0000 | [diff] [blame] | 295 | unsigned f_invpcid = kvm_x86_ops->invpcid_supported() ? F(INVPCID) : 0; |
Paolo Bonzini | 93c4adc | 2014-03-05 23:19:52 +0100 | [diff] [blame] | 296 | unsigned f_mpx = kvm_x86_ops->mpx_supported() ? F(MPX) : 0; |
Wanpeng Li | 55412b2 | 2014-12-02 19:21:30 +0800 | [diff] [blame] | 297 | unsigned f_xsaves = kvm_x86_ops->xsaves_supported() ? F(XSAVES) : 0; |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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) | |
H. Peter Anvin | 840d283 | 2014-02-27 08:31:30 -0800 | [diff] [blame] | 305 | F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLUSH) | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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 = |
Gabriel L. Somlo | 87c0057 | 2014-05-07 16:52:13 -0400 | [diff] [blame] | 321 | /* NOTE: MONITOR (and MWAIT) are emulated as NOP, |
| 322 | * but *not* advertised to guests via CPUID ! */ |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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 */ | |
Liu, Jinsong | fb21536 | 2011-11-28 03:55:19 -0800 | [diff] [blame] | 326 | F(FMA) | F(CX16) | 0 /* xTPR Update, PDCM */ | |
Mao, Junjie | ad756a1 | 2012-07-02 01:18:48 +0000 | [diff] [blame] | 327 | F(PCID) | 0 /* Reserved, DCA */ | F(XMM4_1) | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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) | |
Boris Ostrovsky | 2b036c6 | 2012-01-09 14:00:35 -0500 | [diff] [blame] | 335 | F(3DNOWPREFETCH) | F(OSVW) | 0 /* IBS */ | F(XOP) | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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 = |
Liu, Jinsong | 83c5291 | 2012-02-28 05:15:46 +0000 | [diff] [blame] | 346 | F(FSGSBASE) | F(BMI1) | F(HLE) | F(AVX2) | F(SMEP) | |
Liu, Jinsong | 390bd52 | 2014-02-24 10:58:09 +0000 | [diff] [blame] | 347 | F(BMI2) | F(ERMS) | f_invpcid | F(RTM) | f_mpx | F(RDSEED) | |
Chao Peng | 612263b | 2014-10-22 17:35:24 +0800 | [diff] [blame] | 348 | F(ADX) | F(SMAP) | F(AVX512F) | F(AVX512PF) | F(AVX512ER) | |
| 349 | F(AVX512CD); |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 350 | |
Paolo Bonzini | b65d6e1 | 2014-11-21 18:13:26 +0100 | [diff] [blame] | 351 | /* cpuid 0xD.1.eax */ |
| 352 | const u32 kvm_supported_word10_x86_features = |
Wanpeng Li | 55412b2 | 2014-12-02 19:21:30 +0800 | [diff] [blame] | 353 | F(XSAVEOPT) | F(XSAVEC) | F(XGETBV1) | f_xsaves; |
Paolo Bonzini | b65d6e1 | 2014-11-21 18:13:26 +0100 | [diff] [blame] | 354 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 355 | /* all calls to cpuid_count() should be made on the same cpu */ |
| 356 | get_cpu(); |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 357 | |
| 358 | r = -E2BIG; |
| 359 | |
| 360 | if (*nent >= maxnent) |
| 361 | goto out; |
| 362 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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; |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 388 | for (t = 1; t < times; ++t) { |
| 389 | if (*nent >= maxnent) |
| 390 | goto out; |
| 391 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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 */ |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 404 | for (i = 1; ; ++i) { |
| 405 | if (*nent >= maxnent) |
| 406 | goto out; |
| 407 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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; |
Guo Chao | bbbda79 | 2012-06-28 15:20:58 +0800 | [diff] [blame] | 420 | /* Mask ebx against host capability word 9 */ |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 421 | if (index == 0) { |
| 422 | entry->ebx &= kvm_supported_word9_x86_features; |
| 423 | cpuid_mask(&entry->ebx, 9); |
Will Auld | ba90463 | 2012-11-29 12:42:50 -0800 | [diff] [blame] | 424 | // TSC_ADJUST is emulated |
| 425 | entry->ebx |= F(TSC_ADJUST); |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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; |
Gleb Natapov | a6c06ed | 2011-11-10 14:57:28 +0200 | [diff] [blame] | 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 | } |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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 */ |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 470 | for (i = 1; ; ++i) { |
| 471 | if (*nent >= maxnent) |
| 472 | goto out; |
| 473 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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; |
Paolo Bonzini | 4ff4173 | 2014-02-24 12:15:16 +0100 | [diff] [blame] | 486 | u64 supported = kvm_supported_xcr0(); |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 487 | |
Paolo Bonzini | 4ff4173 | 2014-02-24 12:15:16 +0100 | [diff] [blame] | 488 | entry->eax &= supported; |
Radim Krčmář | e08e833 | 2014-12-04 18:30:41 +0100 | [diff] [blame] | 489 | entry->ebx = xstate_required_size(supported, false); |
| 490 | entry->ecx = entry->ebx; |
Paolo Bonzini | 4ff4173 | 2014-02-24 12:15:16 +0100 | [diff] [blame] | 491 | entry->edx &= supported >> 32; |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 492 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
Paolo Bonzini | b65d6e1 | 2014-11-21 18:13:26 +0100 | [diff] [blame] | 493 | if (!supported) |
| 494 | break; |
| 495 | |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 496 | for (idx = 1, i = 1; idx < 64; ++idx) { |
Paolo Bonzini | 4ff4173 | 2014-02-24 12:15:16 +0100 | [diff] [blame] | 497 | u64 mask = ((u64)1 << idx); |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 498 | if (*nent >= maxnent) |
| 499 | goto out; |
| 500 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 501 | do_cpuid_1_ent(&entry[i], function, idx); |
Paolo Bonzini | 412a3c4 | 2014-12-03 14:38:01 +0100 | [diff] [blame] | 502 | if (idx == 1) { |
Paolo Bonzini | b65d6e1 | 2014-11-21 18:13:26 +0100 | [diff] [blame] | 503 | entry[i].eax &= kvm_supported_word10_x86_features; |
Paolo Bonzini | 412a3c4 | 2014-12-03 14:38:01 +0100 | [diff] [blame] | 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); |
Paolo Bonzini | 404e0a1 | 2014-12-04 15:11:11 +0100 | [diff] [blame] | 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; |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 517 | entry[i].flags |= |
| 518 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
| 519 | ++*nent; |
| 520 | ++i; |
| 521 | } |
| 522 | break; |
| 523 | } |
| 524 | case KVM_CPUID_SIGNATURE: { |
Mathias Krause | 326d07c | 2012-08-30 01:30:13 +0200 | [diff] [blame] | 525 | static const char signature[12] = "KVMKVMKVM\0\0"; |
| 526 | const u32 *sigptr = (const u32 *)signature; |
Michael S. Tsirkin | 57c22e5 | 2012-05-02 17:55:56 +0300 | [diff] [blame] | 527 | entry->eax = KVM_CPUID_FEATURES; |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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) | |
Michael S. Tsirkin | ae7a2a3 | 2012-06-24 19:25:07 +0300 | [diff] [blame] | 538 | (1 << KVM_FEATURE_PV_EOI) | |
Srivatsa Vaddagiri | 6aef266 | 2013-08-26 14:18:34 +0530 | [diff] [blame] | 539 | (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT) | |
| 540 | (1 << KVM_FEATURE_PV_UNHALT); |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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; |
Marcelo Tosatti | e4c9a5a1 | 2014-04-26 22:30:23 -0300 | [diff] [blame] | 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; |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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 */ |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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 | |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 605 | r = 0; |
| 606 | |
| 607 | out: |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 608 | put_cpu(); |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 609 | |
| 610 | return r; |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 611 | } |
| 612 | |
Borislav Petkov | 9c15bb1 | 2013-09-22 16:44:50 +0200 | [diff] [blame] | 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 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 622 | #undef F |
| 623 | |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 624 | struct kvm_cpuid_param { |
| 625 | u32 func; |
| 626 | u32 idx; |
| 627 | bool has_leaf_count; |
Mathias Krause | 326d07c | 2012-08-30 01:30:13 +0200 | [diff] [blame] | 628 | bool (*qualifier)(const struct kvm_cpuid_param *param); |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 629 | }; |
| 630 | |
Mathias Krause | 326d07c | 2012-08-30 01:30:13 +0200 | [diff] [blame] | 631 | static bool is_centaur_cpu(const struct kvm_cpuid_param *param) |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 632 | { |
| 633 | return boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR; |
| 634 | } |
| 635 | |
Borislav Petkov | 9c15bb1 | 2013-09-22 16:44:50 +0200 | [diff] [blame] | 636 | static bool sanity_check_entries(struct kvm_cpuid_entry2 __user *entries, |
| 637 | __u32 num_entries, unsigned int ioctl_type) |
| 638 | { |
| 639 | int i; |
Borislav Petkov | 1b2ca42 | 2013-11-06 15:46:02 +0100 | [diff] [blame] | 640 | __u32 pad[3]; |
Borislav Petkov | 9c15bb1 | 2013-09-22 16:44:50 +0200 | [diff] [blame] | 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++) { |
Borislav Petkov | 1b2ca42 | 2013-11-06 15:46:02 +0100 | [diff] [blame] | 654 | if (copy_from_user(pad, entries[i].padding, sizeof(pad))) |
| 655 | return true; |
| 656 | |
| 657 | if (pad[0] || pad[1] || pad[2]) |
Borislav Petkov | 9c15bb1 | 2013-09-22 16:44:50 +0200 | [diff] [blame] | 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) |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 666 | { |
| 667 | struct kvm_cpuid_entry2 *cpuid_entries; |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 668 | int limit, nent = 0, r = -E2BIG, i; |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 669 | u32 func; |
Mathias Krause | 326d07c | 2012-08-30 01:30:13 +0200 | [diff] [blame] | 670 | static const struct kvm_cpuid_param param[] = { |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 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 | }; |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 677 | |
| 678 | if (cpuid->nent < 1) |
| 679 | goto out; |
| 680 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) |
| 681 | cpuid->nent = KVM_MAX_CPUID_ENTRIES; |
Borislav Petkov | 9c15bb1 | 2013-09-22 16:44:50 +0200 | [diff] [blame] | 682 | |
| 683 | if (sanity_check_entries(entries, cpuid->nent, type)) |
| 684 | return -EINVAL; |
| 685 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 686 | r = -ENOMEM; |
Borislav Petkov | 84cffe4 | 2013-10-29 12:54:56 +0100 | [diff] [blame] | 687 | cpuid_entries = vzalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent); |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 688 | if (!cpuid_entries) |
| 689 | goto out; |
| 690 | |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 691 | r = 0; |
| 692 | for (i = 0; i < ARRAY_SIZE(param); i++) { |
Mathias Krause | 326d07c | 2012-08-30 01:30:13 +0200 | [diff] [blame] | 693 | const struct kvm_cpuid_param *ent = ¶m[i]; |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 694 | |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 695 | if (ent->qualifier && !ent->qualifier(ent)) |
| 696 | continue; |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 697 | |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 698 | r = do_cpuid_ent(&cpuid_entries[nent], ent->func, ent->idx, |
Borislav Petkov | 9c15bb1 | 2013-09-22 16:44:50 +0200 | [diff] [blame] | 699 | &nent, cpuid->nent, type); |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 700 | |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 701 | if (r) |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 702 | goto out_free; |
| 703 | |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 704 | if (!ent->has_leaf_count) |
| 705 | continue; |
| 706 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 707 | limit = cpuid_entries[nent - 1].eax; |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 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, |
Borislav Petkov | 9c15bb1 | 2013-09-22 16:44:50 +0200 | [diff] [blame] | 710 | &nent, cpuid->nent, type); |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 711 | |
Sasha Levin | 831bf66 | 2011-11-28 11:20:29 +0200 | [diff] [blame] | 712 | if (r) |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 713 | goto out_free; |
| 714 | } |
| 715 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 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 | |
Avi Kivity | 62046e5 | 2012-06-07 14:07:48 +0300 | [diff] [blame] | 803 | void kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx, u32 *ecx, u32 *edx) |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 804 | { |
Avi Kivity | 62046e5 | 2012-06-07 14:07:48 +0300 | [diff] [blame] | 805 | u32 function = *eax, index = *ecx; |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 806 | struct kvm_cpuid_entry2 *best; |
| 807 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 808 | best = kvm_find_cpuid_entry(vcpu, function, index); |
| 809 | |
| 810 | if (!best) |
| 811 | best = check_cpuid_limit(vcpu, function, index); |
| 812 | |
Marcelo Tosatti | bc61349 | 2014-09-18 18:24:57 -0300 | [diff] [blame] | 813 | /* |
| 814 | * Perfmon not yet supported for L2 guest. |
| 815 | */ |
| 816 | if (is_guest_mode(vcpu) && function == 0xa) |
| 817 | best = NULL; |
| 818 | |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 819 | if (best) { |
Avi Kivity | 62046e5 | 2012-06-07 14:07:48 +0300 | [diff] [blame] | 820 | *eax = best->eax; |
| 821 | *ebx = best->ebx; |
| 822 | *ecx = best->ecx; |
| 823 | *edx = best->edx; |
| 824 | } else |
| 825 | *eax = *ebx = *ecx = *edx = 0; |
Gleb Natapov | a9d4e43 | 2013-11-04 15:52:43 +0200 | [diff] [blame] | 826 | trace_kvm_cpuid(function, *eax, *ebx, *ecx, *edx); |
Avi Kivity | 62046e5 | 2012-06-07 14:07:48 +0300 | [diff] [blame] | 827 | } |
Julian Stecklina | 66f7b72 | 2012-12-05 15:26:19 +0100 | [diff] [blame] | 828 | EXPORT_SYMBOL_GPL(kvm_cpuid); |
Avi Kivity | 62046e5 | 2012-06-07 14:07:48 +0300 | [diff] [blame] | 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); |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 841 | kvm_x86_ops->skip_emulated_instruction(vcpu); |
Avi Kivity | 00b27a3 | 2011-11-23 16:30:32 +0200 | [diff] [blame] | 842 | } |
| 843 | EXPORT_SYMBOL_GPL(kvm_emulate_cpuid); |