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 "reverse_cpuid.h"
   7 #include <asm/cpu.h>
   8 #include <asm/processor.h>
   9 #include <uapi/asm/kvm_para.h>
  10
  11 extern u32 kvm_cpu_caps[NR_KVM_CPU_CAPS] __read_mostly;
  12 void kvm_set_cpu_caps(void);
  13
  14 void kvm_update_cpuid_runtime(struct kvm_vcpu *vcpu);
  15 void kvm_update_pv_runtime(struct kvm_vcpu *vcpu);
  16 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
  17                                               u32 function, u32 index);
  18 int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
  19                             struct kvm_cpuid_entry2 __user *entries,
  20                             unsigned int type);
  21 int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
  22                              struct kvm_cpuid *cpuid,
  23                              struct kvm_cpuid_entry __user *entries);
  24 int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
  25                               struct kvm_cpuid2 *cpuid,
  26                               struct kvm_cpuid_entry2 __user *entries);
  27 int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
  28                               struct kvm_cpuid2 *cpuid,
  29                               struct kvm_cpuid_entry2 __user *entries);
  30 bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx,
  31                u32 *ecx, u32 *edx, bool exact_only);
  32
  33 int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu);
  34 u64 kvm_vcpu_reserved_gpa_bits_raw(struct kvm_vcpu *vcpu);
  35
  36 static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
  37 {
  38         return vcpu->arch.maxphyaddr;
  39 }
  40
  41 static inline bool kvm_vcpu_is_legal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
  42 {
  43         return !(gpa & vcpu->arch.reserved_gpa_bits);
  44 }
  45
  46 static inline bool kvm_vcpu_is_illegal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
  47 {
  48         return !kvm_vcpu_is_legal_gpa(vcpu, gpa);
  49 }
  50
  51 static inline bool kvm_vcpu_is_legal_aligned_gpa(struct kvm_vcpu *vcpu,
  52                                                  gpa_t gpa, gpa_t alignment)
  53 {
  54         return IS_ALIGNED(gpa, alignment) && kvm_vcpu_is_legal_gpa(vcpu, gpa);
  55 }
  56
  57 static inline bool page_address_valid(struct kvm_vcpu *vcpu, gpa_t gpa)
  58 {
  59         return kvm_vcpu_is_legal_aligned_gpa(vcpu, gpa, PAGE_SIZE);
  60 }
  61
  62 static __always_inline void cpuid_entry_override(struct kvm_cpuid_entry2 *entry,
  63                                                  unsigned int leaf)
  64 {
  65         u32 *reg = cpuid_entry_get_reg(entry, leaf * 32);
  66
  67         BUILD_BUG_ON(leaf >= ARRAY_SIZE(kvm_cpu_caps));
  68         *reg = kvm_cpu_caps[leaf];
  69 }
  70
  71 static __always_inline u32 *guest_cpuid_get_register(struct kvm_vcpu *vcpu,
  72                                                      unsigned int x86_feature)
  73 {
  74         const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
  75         struct kvm_cpuid_entry2 *entry;
  76
  77         entry = kvm_find_cpuid_entry(vcpu, cpuid.function, cpuid.index);
  78         if (!entry)
  79                 return NULL;
  80
  81         return __cpuid_entry_get_reg(entry, cpuid.reg);
  82 }
  83
  84 static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu,
  85                                             unsigned int x86_feature)
  86 {
  87         u32 *reg;
  88
  89         reg = guest_cpuid_get_register(vcpu, x86_feature);
  90         if (!reg)
  91                 return false;
  92
  93         return *reg & __feature_bit(x86_feature);
  94 }
  95
  96 static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu,
  97                                               unsigned int x86_feature)
  98 {
  99         u32 *reg;
 100
 101         reg = guest_cpuid_get_register(vcpu, x86_feature);
 102         if (reg)
 103                 *reg &= ~__feature_bit(x86_feature);
 104 }
 105
 106 static inline bool guest_cpuid_is_amd_or_hygon(struct kvm_vcpu *vcpu)
 107 {
 108         struct kvm_cpuid_entry2 *best;
 109
 110         best = kvm_find_cpuid_entry(vcpu, 0, 0);
 111         return best &&
 112                (is_guest_vendor_amd(best->ebx, best->ecx, best->edx) ||
 113                 is_guest_vendor_hygon(best->ebx, best->ecx, best->edx));
 114 }
 115
 116 static inline bool guest_cpuid_is_intel(struct kvm_vcpu *vcpu)
 117 {
 118         struct kvm_cpuid_entry2 *best;
 119
 120         best = kvm_find_cpuid_entry(vcpu, 0, 0);
 121         return best && is_guest_vendor_intel(best->ebx, best->ecx, best->edx);
 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 guest_has_spec_ctrl_msr(struct kvm_vcpu *vcpu)
 158 {
 159         return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
 160                 guest_cpuid_has(vcpu, X86_FEATURE_AMD_STIBP) ||
 161                 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS) ||
 162                 guest_cpuid_has(vcpu, X86_FEATURE_AMD_SSBD));
 163 }
 164
 165 static inline bool guest_has_pred_cmd_msr(struct kvm_vcpu *vcpu)
 166 {
 167         return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
 168                 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB));
 169 }
 170
 171 static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu)
 172 {
 173         return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT;
 174 }
 175
 176 static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu)
 177 {
 178         return vcpu->arch.msr_misc_features_enables &
 179                   MSR_MISC_FEATURES_ENABLES_CPUID_FAULT;
 180 }
 181
 182 static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature)
 183 {
 184         unsigned int x86_leaf = __feature_leaf(x86_feature);
 185
 186         reverse_cpuid_check(x86_leaf);
 187         kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature);
 188 }
 189
 190 static __always_inline void kvm_cpu_cap_set(unsigned int x86_feature)
 191 {
 192         unsigned int x86_leaf = __feature_leaf(x86_feature);
 193
 194         reverse_cpuid_check(x86_leaf);
 195         kvm_cpu_caps[x86_leaf] |= __feature_bit(x86_feature);
 196 }
 197
 198 static __always_inline u32 kvm_cpu_cap_get(unsigned int x86_feature)
 199 {
 200         unsigned int x86_leaf = __feature_leaf(x86_feature);
 201
 202         reverse_cpuid_check(x86_leaf);
 203         return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature);
 204 }
 205
 206 static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature)
 207 {
 208         return !!kvm_cpu_cap_get(x86_feature);
 209 }
 210
 211 static __always_inline void kvm_cpu_cap_check_and_set(unsigned int x86_feature)
 212 {
 213         if (boot_cpu_has(x86_feature))
 214                 kvm_cpu_cap_set(x86_feature);
 215 }
 216
 217 static __always_inline bool guest_pv_has(struct kvm_vcpu *vcpu,
 218                                          unsigned int kvm_feature)
 219 {
 220         if (!vcpu->arch.pv_cpuid.enforce)
 221                 return true;
 222
 223         return vcpu->arch.pv_cpuid.features & (1u << kvm_feature);
 224 }
 225
 226 #endif