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_F_0_EDX]       = {       0xf, 0, CPUID_EDX},
  51         [CPUID_F_1_EDX]       = {       0xf, 1, CPUID_EDX},
  52         [CPUID_8000_0008_EBX] = {0x80000008, 0, CPUID_EBX},
  53         [CPUID_6_EAX]         = {         6, 0, CPUID_EAX},
  54         [CPUID_8000_000A_EDX] = {0x8000000a, 0, CPUID_EDX},
  55         [CPUID_7_ECX]         = {         7, 0, CPUID_ECX},
  56         [CPUID_8000_0007_EBX] = {0x80000007, 0, CPUID_EBX},
  57         [CPUID_7_EDX]         = {         7, 0, CPUID_EDX},
  58 };
  59
  60 static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned x86_feature)
  61 {
  62         unsigned x86_leaf = x86_feature / 32;
  63
  64         BUILD_BUG_ON(x86_leaf >= ARRAY_SIZE(reverse_cpuid));
  65         BUILD_BUG_ON(reverse_cpuid[x86_leaf].function == 0);
  66
  67         return reverse_cpuid[x86_leaf];
  68 }
  69
  70 static __always_inline int *guest_cpuid_get_register(struct kvm_vcpu *vcpu, unsigned x86_feature)
  71 {
  72         struct kvm_cpuid_entry2 *entry;
  73         const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
  74
  75         entry = kvm_find_cpuid_entry(vcpu, cpuid.function, cpuid.index);
  76         if (!entry)
  77                 return NULL;
  78
  79         switch (cpuid.reg) {
  80         case CPUID_EAX:
  81                 return &entry->eax;
  82         case CPUID_EBX:
  83                 return &entry->ebx;
  84         case CPUID_ECX:
  85                 return &entry->ecx;
  86         case CPUID_EDX:
  87                 return &entry->edx;
  88         default:
  89                 BUILD_BUG();
  90                 return NULL;
  91         }
  92 }
  93
  94 static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu, unsigned x86_feature)
  95 {
  96         int *reg;
  97
  98         if (x86_feature == X86_FEATURE_XSAVE &&
  99                         !static_cpu_has(X86_FEATURE_XSAVE))
 100                 return false;
 101
 102         reg = guest_cpuid_get_register(vcpu, x86_feature);
 103         if (!reg)
 104                 return false;
 105
 106         return *reg & bit(x86_feature);
 107 }
 108
 109 static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu, unsigned x86_feature)
 110 {
 111         int *reg;
 112
 113         reg = guest_cpuid_get_register(vcpu, x86_feature);
 114         if (reg)
 115                 *reg &= ~bit(x86_feature);
 116 }
 117
 118 static inline bool guest_cpuid_is_amd(struct kvm_vcpu *vcpu)
 119 {
 120         struct kvm_cpuid_entry2 *best;
 121
 122         best = kvm_find_cpuid_entry(vcpu, 0, 0);
 123         return best && best->ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx;
 124 }
 125
 126 static inline int guest_cpuid_family(struct kvm_vcpu *vcpu)
 127 {
 128         struct kvm_cpuid_entry2 *best;
 129
 130         best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
 131         if (!best)
 132                 return -1;
 133
 134         return x86_family(best->eax);
 135 }
 136
 137 static inline int guest_cpuid_model(struct kvm_vcpu *vcpu)
 138 {
 139         struct kvm_cpuid_entry2 *best;
 140
 141         best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
 142         if (!best)
 143                 return -1;
 144
 145         return x86_model(best->eax);
 146 }
 147
 148 static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
 149 {
 150         struct kvm_cpuid_entry2 *best;
 151
 152         best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
 153         if (!best)
 154                 return -1;
 155
 156         return x86_stepping(best->eax);
 157 }
 158
 159 static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu)
 160 {
 161         return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT;
 162 }
 163
 164 static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu)
 165 {
 166         return vcpu->arch.msr_misc_features_enables &
 167                   MSR_MISC_FEATURES_ENABLES_CPUID_FAULT;
 168 }
 169
 170 #endif