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 enum kvm_governed_features { 246 #define KVM_GOVERNED_FEATURE(x) KVM_GOVERNED_##x, 247 #include "governed_features.h" 248 KVM_NR_GOVERNED_FEATURES 249 }; 250 251 static __always_inline int kvm_governed_feature_index(unsigned int x86_feature) 252 { 253 switch (x86_feature) { 254 #define KVM_GOVERNED_FEATURE(x) case x: return KVM_GOVERNED_##x; 255 #include "governed_features.h" 256 default: 257 return -1; 258 } 259 } 260 261 static __always_inline bool kvm_is_governed_feature(unsigned int x86_feature) 262 { 263 return kvm_governed_feature_index(x86_feature) >= 0; 264 } 265 266 static __always_inline void kvm_governed_feature_set(struct kvm_vcpu *vcpu, 267 unsigned int x86_feature) 268 { 269 BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature)); 270 271 __set_bit(kvm_governed_feature_index(x86_feature), 272 vcpu->arch.governed_features.enabled); 273 } 274 275 static __always_inline void kvm_governed_feature_check_and_set(struct kvm_vcpu *vcpu, 276 unsigned int x86_feature) 277 { 278 if (kvm_cpu_cap_has(x86_feature) && guest_cpuid_has(vcpu, x86_feature)) 279 kvm_governed_feature_set(vcpu, x86_feature); 280 } 281 282 static __always_inline bool guest_can_use(struct kvm_vcpu *vcpu, 283 unsigned int x86_feature) 284 { 285 BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature)); 286 287 return test_bit(kvm_governed_feature_index(x86_feature), 288 vcpu->arch.governed_features.enabled); 289 } 290 291 #endif 292