arch/x86/kvm/cpuid.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef ARCH_X86_KVM_CPUID_H
   3 #define ARCH_X86_KVM_CPUID_H
   4
   5 #include "x86.h"
   6 #include <asm/cpu.h>
   7 #include <asm/processor.h>
   8
   9 int kvm_update_cpuid(struct kvm_vcpu *vcpu);
  10 bool kvm_mpx_supported(void);
  11 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
  12                                               u32 function, u32 index);
  13 int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
  14                             struct kvm_cpuid_entry2 __user *entries,
  15                             unsigned int type);
  16 int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
  17                              struct kvm_cpuid *cpuid,
  18                              struct kvm_cpuid_entry __user *entries);
  19 int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
  20                               struct kvm_cpuid2 *cpuid,
  21                               struct kvm_cpuid_entry2 __user *entries);
  22 int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
  23                               struct kvm_cpuid2 *cpuid,
  24                               struct kvm_cpuid_entry2 __user *entries);
  25 bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx,
  26                u32 *ecx, u32 *edx, bool check_limit);
  27
  28 int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu);
  29
  30 static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
  31 {
  32         return vcpu->arch.maxphyaddr;
  33 }
  34
  35 struct cpuid_reg {
  36         u32 function;
  37         u32 index;
  38         int reg;
  39 };
  40
  41 static const struct cpuid_reg reverse_cpuid[] = {
  42         [CPUID_1_EDX]         = {         1, 0, CPUID_EDX},
  43         [CPUID_8000_0001_EDX] = {0x80000001, 0, CPUID_EDX},
  44         [CPUID_8086_0001_EDX] = {0x80860001, 0, CPUID_EDX},
  45         [CPUID_1_ECX]         = {         1, 0, CPUID_ECX},
  46         [CPUID_C000_0001_EDX] = {0xc0000001, 0, CPUID_EDX},
  47         [CPUID_8000_0001_ECX] = {0x80000001, 0, CPUID_ECX},
  48         [CPUID_7_0_EBX]       = {         7, 0, CPUID_EBX},
  49         [CPUID_D_1_EAX]       = {       0xd, 1, CPUID_EAX},
  50         [CPUID_8000_0008_EBX] = {0x80000008, 0, CPUID_EBX},
  51         [CPUID_6_EAX]         = {         6, 0, CPUID_EAX},
  52         [CPUID_8000_000A_EDX] = {0x8000000a, 0, CPUID_EDX},
  53         [CPUID_7_ECX]         = {         7, 0, CPUID_ECX},
  54         [CPUID_8000_0007_EBX] = {0x80000007, 0, CPUID_EBX},
  55         [CPUID_7_EDX]         = {         7, 0, CPUID_EDX},
  56 };
  57
  58 static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned x86_feature)
  59 {
  60         unsigned x86_leaf = x86_feature / 32;
  61
  62         BUILD_BUG_ON(x86_leaf >= ARRAY_SIZE(reverse_cpuid));
  63         BUILD_BUG_ON(reverse_cpuid[x86_leaf].function == 0);
  64
  65         return reverse_cpuid[x86_leaf];
  66 }
  67
  68 static __always_inline int *guest_cpuid_get_register(struct kvm_vcpu *vcpu, unsigned x86_feature)
  69 {
  70         struct kvm_cpuid_entry2 *entry;
  71         const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
  72
  73         entry = kvm_find_cpuid_entry(vcpu, cpuid.function, cpuid.index);
  74         if (!entry)
  75                 return NULL;
  76
  77         switch (cpuid.reg) {
  78         case CPUID_EAX:
  79                 return &entry->eax;
  80         case CPUID_EBX:
  81                 return &entry->ebx;
  82         case CPUID_ECX:
  83                 return &entry->ecx;
  84         case CPUID_EDX:
  85                 return &entry->edx;
  86         default:
  87                 BUILD_BUG();
  88                 return NULL;
  89         }
  90 }
  91
  92 static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu, unsigned x86_feature)
  93 {
  94         int *reg;
  95
  96         if (x86_feature == X86_FEATURE_XSAVE &&
  97                         !static_cpu_has(X86_FEATURE_XSAVE))
  98                 return false;
  99
 100         reg = guest_cpuid_get_register(vcpu, x86_feature);
 101         if (!reg)
 102                 return false;
 103
 104         return *reg & bit(x86_feature);
 105 }
 106
 107 static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu, unsigned x86_feature)
 108 {
 109         int *reg;
 110
 111         reg = guest_cpuid_get_register(vcpu, x86_feature);
 112         if (reg)
 113                 *reg &= ~bit(x86_feature);
 114 }
 115
 116 static inline bool guest_cpuid_is_amd(struct kvm_vcpu *vcpu)
 117 {
 118         struct kvm_cpuid_entry2 *best;
 119
 120         best = kvm_find_cpuid_entry(vcpu, 0, 0);
 121         return best && best->ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx;
 122 }
 123
 124 static inline int guest_cpuid_family(struct kvm_vcpu *vcpu)
 125 {
 126         struct kvm_cpuid_entry2 *best;
 127
 128         best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
 129         if (!best)
 130                 return -1;
 131
 132         return x86_family(best->eax);
 133 }
 134
 135 static inline int guest_cpuid_model(struct kvm_vcpu *vcpu)
 136 {
 137         struct kvm_cpuid_entry2 *best;
 138
 139         best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
 140         if (!best)
 141                 return -1;
 142
 143         return x86_model(best->eax);
 144 }
 145
 146 static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
 147 {
 148         struct kvm_cpuid_entry2 *best;
 149
 150         best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
 151         if (!best)
 152                 return -1;
 153
 154         return x86_stepping(best->eax);
 155 }
 156
 157 static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu)
 158 {
 159         return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT;
 160 }
 161
 162 static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu)
 163 {
 164         return vcpu->arch.msr_misc_features_enables &
 165                   MSR_MISC_FEATURES_ENABLES_CPUID_FAULT;
 166 }
 167
 168 #endif