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_legal_aligned_gpa(struct kvm_vcpu *vcpu, 51 gpa_t gpa, gpa_t alignment) 52 { 53 return IS_ALIGNED(gpa, alignment) && kvm_vcpu_is_legal_gpa(vcpu, gpa); 54 } 55 56 static inline bool page_address_valid(struct kvm_vcpu *vcpu, gpa_t gpa) 57 { 58 return kvm_vcpu_is_legal_aligned_gpa(vcpu, gpa, PAGE_SIZE); 59 } 60 61 static __always_inline void cpuid_entry_override(struct kvm_cpuid_entry2 *entry, 62 unsigned int leaf) 63 { 64 u32 *reg = cpuid_entry_get_reg(entry, leaf * 32); 65 66 BUILD_BUG_ON(leaf >= ARRAY_SIZE(kvm_cpu_caps)); 67 *reg = kvm_cpu_caps[leaf]; 68 } 69 70 static __always_inline u32 *guest_cpuid_get_register(struct kvm_vcpu *vcpu, 71 unsigned int x86_feature) 72 { 73 const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature); 74 struct kvm_cpuid_entry2 *entry; 75 76 entry = kvm_find_cpuid_entry_index(vcpu, cpuid.function, cpuid.index); 77 if (!entry) 78 return NULL; 79 80 return __cpuid_entry_get_reg(entry, cpuid.reg); 81 } 82 83 static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu, 84 unsigned int x86_feature) 85 { 86 u32 *reg; 87 88 reg = guest_cpuid_get_register(vcpu, x86_feature); 89 if (!reg) 90 return false; 91 92 return *reg & __feature_bit(x86_feature); 93 } 94 95 static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu, 96 unsigned int x86_feature) 97 { 98 u32 *reg; 99 100 reg = guest_cpuid_get_register(vcpu, x86_feature); 101 if (reg) 102 *reg &= ~__feature_bit(x86_feature); 103 } 104 105 static inline bool guest_cpuid_is_amd_or_hygon(struct kvm_vcpu *vcpu) 106 { 107 struct kvm_cpuid_entry2 *best; 108 109 best = kvm_find_cpuid_entry(vcpu, 0); 110 return best && 111 (is_guest_vendor_amd(best->ebx, best->ecx, best->edx) || 112 is_guest_vendor_hygon(best->ebx, best->ecx, best->edx)); 113 } 114 115 static inline bool guest_cpuid_is_intel(struct kvm_vcpu *vcpu) 116 { 117 struct kvm_cpuid_entry2 *best; 118 119 best = kvm_find_cpuid_entry(vcpu, 0); 120 return best && is_guest_vendor_intel(best->ebx, best->ecx, best->edx); 121 } 122 123 static inline bool guest_cpuid_is_amd_compatible(struct kvm_vcpu *vcpu) 124 { 125 return vcpu->arch.is_amd_compatible; 126 } 127 128 static inline bool guest_cpuid_is_intel_compatible(struct kvm_vcpu *vcpu) 129 { 130 return !guest_cpuid_is_amd_compatible(vcpu); 131 } 132 133 static inline int guest_cpuid_family(struct kvm_vcpu *vcpu) 134 { 135 struct kvm_cpuid_entry2 *best; 136 137 best = kvm_find_cpuid_entry(vcpu, 0x1); 138 if (!best) 139 return -1; 140 141 return x86_family(best->eax); 142 } 143 144 static inline int guest_cpuid_model(struct kvm_vcpu *vcpu) 145 { 146 struct kvm_cpuid_entry2 *best; 147 148 best = kvm_find_cpuid_entry(vcpu, 0x1); 149 if (!best) 150 return -1; 151 152 return x86_model(best->eax); 153 } 154 155 static inline bool cpuid_model_is_consistent(struct kvm_vcpu *vcpu) 156 { 157 return boot_cpu_data.x86_model == guest_cpuid_model(vcpu); 158 } 159 160 static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu) 161 { 162 struct kvm_cpuid_entry2 *best; 163 164 best = kvm_find_cpuid_entry(vcpu, 0x1); 165 if (!best) 166 return -1; 167 168 return x86_stepping(best->eax); 169 } 170 171 static inline bool guest_has_spec_ctrl_msr(struct kvm_vcpu *vcpu) 172 { 173 return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) || 174 guest_cpuid_has(vcpu, X86_FEATURE_AMD_STIBP) || 175 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS) || 176 guest_cpuid_has(vcpu, X86_FEATURE_AMD_SSBD)); 177 } 178 179 static inline bool guest_has_pred_cmd_msr(struct kvm_vcpu *vcpu) 180 { 181 return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) || 182 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB) || 183 guest_cpuid_has(vcpu, X86_FEATURE_SBPB)); 184 } 185 186 static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu) 187 { 188 return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT; 189 } 190 191 static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu) 192 { 193 return vcpu->arch.msr_misc_features_enables & 194 MSR_MISC_FEATURES_ENABLES_CPUID_FAULT; 195 } 196 197 static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature) 198 { 199 unsigned int x86_leaf = __feature_leaf(x86_feature); 200 201 reverse_cpuid_check(x86_leaf); 202 kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature); 203 } 204 205 static __always_inline void kvm_cpu_cap_set(unsigned int x86_feature) 206 { 207 unsigned int x86_leaf = __feature_leaf(x86_feature); 208 209 reverse_cpuid_check(x86_leaf); 210 kvm_cpu_caps[x86_leaf] |= __feature_bit(x86_feature); 211 } 212 213 static __always_inline u32 kvm_cpu_cap_get(unsigned int x86_feature) 214 { 215 unsigned int x86_leaf = __feature_leaf(x86_feature); 216 217 reverse_cpuid_check(x86_leaf); 218 return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature); 219 } 220 221 static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature) 222 { 223 return !!kvm_cpu_cap_get(x86_feature); 224 } 225 226 static __always_inline void kvm_cpu_cap_check_and_set(unsigned int x86_feature) 227 { 228 if (boot_cpu_has(x86_feature)) 229 kvm_cpu_cap_set(x86_feature); 230 } 231 232 static __always_inline bool guest_pv_has(struct kvm_vcpu *vcpu, 233 unsigned int kvm_feature) 234 { 235 if (!vcpu->arch.pv_cpuid.enforce) 236 return true; 237 238 return vcpu->arch.pv_cpuid.features & (1u << kvm_feature); 239 } 240 241 enum kvm_governed_features { 242 #define KVM_GOVERNED_FEATURE(x) KVM_GOVERNED_##x, 243 #include "governed_features.h" 244 KVM_NR_GOVERNED_FEATURES 245 }; 246 247 static __always_inline int kvm_governed_feature_index(unsigned int x86_feature) 248 { 249 switch (x86_feature) { 250 #define KVM_GOVERNED_FEATURE(x) case x: return KVM_GOVERNED_##x; 251 #include "governed_features.h" 252 default: 253 return -1; 254 } 255 } 256 257 static __always_inline bool kvm_is_governed_feature(unsigned int x86_feature) 258 { 259 return kvm_governed_feature_index(x86_feature) >= 0; 260 } 261 262 static __always_inline void kvm_governed_feature_set(struct kvm_vcpu *vcpu, 263 unsigned int x86_feature) 264 { 265 BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature)); 266 267 __set_bit(kvm_governed_feature_index(x86_feature), 268 vcpu->arch.governed_features.enabled); 269 } 270 271 static __always_inline void kvm_governed_feature_check_and_set(struct kvm_vcpu *vcpu, 272 unsigned int x86_feature) 273 { 274 if (kvm_cpu_cap_has(x86_feature) && guest_cpuid_has(vcpu, x86_feature)) 275 kvm_governed_feature_set(vcpu, x86_feature); 276 } 277 278 static __always_inline bool guest_can_use(struct kvm_vcpu *vcpu, 279 unsigned int x86_feature) 280 { 281 BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature)); 282 283 return test_bit(kvm_governed_feature_index(x86_feature), 284 vcpu->arch.governed_features.enabled); 285 } 286 287 static inline bool kvm_vcpu_is_legal_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) 288 { 289 if (guest_can_use(vcpu, X86_FEATURE_LAM)) 290 cr3 &= ~(X86_CR3_LAM_U48 | X86_CR3_LAM_U57); 291 292 return kvm_vcpu_is_legal_gpa(vcpu, cr3); 293 } 294 295 #endif 296