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_index(struct kvm_vcpu *vcpu,
  17                                                     u32 function, u32 index);
  18 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
  19                                               u32 function);
  20 int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
  21                             struct kvm_cpuid_entry2 __user *entries,
  22                             unsigned int type);
  23 int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
  24                              struct kvm_cpuid *cpuid,
  25                              struct kvm_cpuid_entry __user *entries);
  26 int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
  27                               struct kvm_cpuid2 *cpuid,
  28                               struct kvm_cpuid_entry2 __user *entries);
  29 int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
  30                               struct kvm_cpuid2 *cpuid,
  31                               struct kvm_cpuid_entry2 __user *entries);
  32 bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx,
  33                u32 *ecx, u32 *edx, bool exact_only);
  34
  35 u32 xstate_required_size(u64 xstate_bv, bool compacted);
  36
  37 int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu);
  38 u64 kvm_vcpu_reserved_gpa_bits_raw(struct kvm_vcpu *vcpu);
  39
  40 static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
  41 {
  42         return vcpu->arch.maxphyaddr;
  43 }
  44
  45 static inline bool kvm_vcpu_is_legal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
  46 {
  47         return !(gpa & vcpu->arch.reserved_gpa_bits);
  48 }
  49
  50 static inline bool kvm_vcpu_is_illegal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
  51 {
  52         return !kvm_vcpu_is_legal_gpa(vcpu, gpa);
  53 }
  54
  55 static inline bool kvm_vcpu_is_legal_aligned_gpa(struct kvm_vcpu *vcpu,
  56                                                  gpa_t gpa, gpa_t alignment)
  57 {
  58         return IS_ALIGNED(gpa, alignment) && kvm_vcpu_is_legal_gpa(vcpu, gpa);
  59 }
  60
  61 static inline bool page_address_valid(struct kvm_vcpu *vcpu, gpa_t gpa)
  62 {
  63         return kvm_vcpu_is_legal_aligned_gpa(vcpu, gpa, PAGE_SIZE);
  64 }
  65
  66 static __always_inline void cpuid_entry_override(struct kvm_cpuid_entry2 *entry,
  67                                                  unsigned int leaf)
  68 {
  69         u32 *reg = cpuid_entry_get_reg(entry, leaf * 32);
  70
  71         BUILD_BUG_ON(leaf >= ARRAY_SIZE(kvm_cpu_caps));
  72         *reg = kvm_cpu_caps[leaf];
  73 }
  74
  75 static __always_inline u32 *guest_cpuid_get_register(struct kvm_vcpu *vcpu,
  76                                                      unsigned int x86_feature)
  77 {
  78         const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
  79         struct kvm_cpuid_entry2 *entry;
  80
  81         entry = kvm_find_cpuid_entry_index(vcpu, cpuid.function, cpuid.index);
  82         if (!entry)
  83                 return NULL;
  84
  85         return __cpuid_entry_get_reg(entry, cpuid.reg);
  86 }
  87
  88 static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu,
  89                                             unsigned int x86_feature)
  90 {
  91         u32 *reg;
  92
  93         reg = guest_cpuid_get_register(vcpu, x86_feature);
  94         if (!reg)
  95                 return false;
  96
  97         return *reg & __feature_bit(x86_feature);
  98 }
  99
 100 static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu,
 101                                               unsigned int x86_feature)
 102 {
 103         u32 *reg;
 104
 105         reg = guest_cpuid_get_register(vcpu, x86_feature);
 106         if (reg)
 107                 *reg &= ~__feature_bit(x86_feature);
 108 }
 109
 110 static inline bool guest_cpuid_is_amd_or_hygon(struct kvm_vcpu *vcpu)
 111 {
 112         struct kvm_cpuid_entry2 *best;
 113
 114         best = kvm_find_cpuid_entry(vcpu, 0);
 115         return best &&
 116                (is_guest_vendor_amd(best->ebx, best->ecx, best->edx) ||
 117                 is_guest_vendor_hygon(best->ebx, best->ecx, best->edx));
 118 }
 119
 120 static inline bool guest_cpuid_is_intel(struct kvm_vcpu *vcpu)
 121 {
 122         struct kvm_cpuid_entry2 *best;
 123
 124         best = kvm_find_cpuid_entry(vcpu, 0);
 125         return best && is_guest_vendor_intel(best->ebx, best->ecx, best->edx);
 126 }
 127
 128 static inline bool guest_cpuid_is_amd_compatible(struct kvm_vcpu *vcpu)
 129 {
 130         return vcpu->arch.is_amd_compatible;
 131 }
 132
 133 static inline bool guest_cpuid_is_intel_compatible(struct kvm_vcpu *vcpu)
 134 {
 135         return !guest_cpuid_is_amd_compatible(vcpu);
 136 }
 137
 138 static inline int guest_cpuid_family(struct kvm_vcpu *vcpu)
 139 {
 140         struct kvm_cpuid_entry2 *best;
 141
 142         best = kvm_find_cpuid_entry(vcpu, 0x1);
 143         if (!best)
 144                 return -1;
 145
 146         return x86_family(best->eax);
 147 }
 148
 149 static inline int guest_cpuid_model(struct kvm_vcpu *vcpu)
 150 {
 151         struct kvm_cpuid_entry2 *best;
 152
 153         best = kvm_find_cpuid_entry(vcpu, 0x1);
 154         if (!best)
 155                 return -1;
 156
 157         return x86_model(best->eax);
 158 }
 159
 160 static inline bool cpuid_model_is_consistent(struct kvm_vcpu *vcpu)
 161 {
 162         return boot_cpu_data.x86_model == guest_cpuid_model(vcpu);
 163 }
 164
 165 static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
 166 {
 167         struct kvm_cpuid_entry2 *best;
 168
 169         best = kvm_find_cpuid_entry(vcpu, 0x1);
 170         if (!best)
 171                 return -1;
 172
 173         return x86_stepping(best->eax);
 174 }
 175
 176 static inline bool guest_has_spec_ctrl_msr(struct kvm_vcpu *vcpu)
 177 {
 178         return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
 179                 guest_cpuid_has(vcpu, X86_FEATURE_AMD_STIBP) ||
 180                 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS) ||
 181                 guest_cpuid_has(vcpu, X86_FEATURE_AMD_SSBD));
 182 }
 183
 184 static inline bool guest_has_pred_cmd_msr(struct kvm_vcpu *vcpu)
 185 {
 186         return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
 187                 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB));
 188 }
 189
 190 static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu)
 191 {
 192         return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT;
 193 }
 194
 195 static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu)
 196 {
 197         return vcpu->arch.msr_misc_features_enables &
 198                   MSR_MISC_FEATURES_ENABLES_CPUID_FAULT;
 199 }
 200
 201 static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature)
 202 {
 203         unsigned int x86_leaf = __feature_leaf(x86_feature);
 204
 205         reverse_cpuid_check(x86_leaf);
 206         kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature);
 207 }
 208
 209 static __always_inline void kvm_cpu_cap_set(unsigned int x86_feature)
 210 {
 211         unsigned int x86_leaf = __feature_leaf(x86_feature);
 212
 213         reverse_cpuid_check(x86_leaf);
 214         kvm_cpu_caps[x86_leaf] |= __feature_bit(x86_feature);
 215 }
 216
 217 static __always_inline u32 kvm_cpu_cap_get(unsigned int x86_feature)
 218 {
 219         unsigned int x86_leaf = __feature_leaf(x86_feature);
 220
 221         reverse_cpuid_check(x86_leaf);
 222         return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature);
 223 }
 224
 225 static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature)
 226 {
 227         return !!kvm_cpu_cap_get(x86_feature);
 228 }
 229
 230 static __always_inline void kvm_cpu_cap_check_and_set(unsigned int x86_feature)
 231 {
 232         if (boot_cpu_has(x86_feature))
 233                 kvm_cpu_cap_set(x86_feature);
 234 }
 235
 236 static __always_inline bool guest_pv_has(struct kvm_vcpu *vcpu,
 237                                          unsigned int kvm_feature)
 238 {
 239         if (!vcpu->arch.pv_cpuid.enforce)
 240                 return true;
 241
 242         return vcpu->arch.pv_cpuid.features & (1u << kvm_feature);
 243 }
 244
 245 #endif