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 int guest_cpuid_family(struct kvm_vcpu *vcpu) 129 { 130 struct kvm_cpuid_entry2 *best; 131 132 best = kvm_find_cpuid_entry(vcpu, 0x1); 133 if (!best) 134 return -1; 135 136 return x86_family(best->eax); 137 } 138 139 static inline int guest_cpuid_model(struct kvm_vcpu *vcpu) 140 { 141 struct kvm_cpuid_entry2 *best; 142 143 best = kvm_find_cpuid_entry(vcpu, 0x1); 144 if (!best) 145 return -1; 146 147 return x86_model(best->eax); 148 } 149 150 static inline bool cpuid_model_is_consistent(struct kvm_vcpu *vcpu) 151 { 152 return boot_cpu_data.x86_model == guest_cpuid_model(vcpu); 153 } 154 155 static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu) 156 { 157 struct kvm_cpuid_entry2 *best; 158 159 best = kvm_find_cpuid_entry(vcpu, 0x1); 160 if (!best) 161 return -1; 162 163 return x86_stepping(best->eax); 164 } 165 166 static inline bool guest_has_spec_ctrl_msr(struct kvm_vcpu *vcpu) 167 { 168 return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) || 169 guest_cpuid_has(vcpu, X86_FEATURE_AMD_STIBP) || 170 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS) || 171 guest_cpuid_has(vcpu, X86_FEATURE_AMD_SSBD)); 172 } 173 174 static inline bool guest_has_pred_cmd_msr(struct kvm_vcpu *vcpu) 175 { 176 return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) || 177 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB) || 178 guest_cpuid_has(vcpu, X86_FEATURE_SBPB)); 179 } 180 181 static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu) 182 { 183 return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT; 184 } 185 186 static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu) 187 { 188 return vcpu->arch.msr_misc_features_enables & 189 MSR_MISC_FEATURES_ENABLES_CPUID_FAULT; 190 } 191 192 static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature) 193 { 194 unsigned int x86_leaf = __feature_leaf(x86_feature); 195 196 reverse_cpuid_check(x86_leaf); 197 kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature); 198 } 199 200 static __always_inline void kvm_cpu_cap_set(unsigned int x86_feature) 201 { 202 unsigned int x86_leaf = __feature_leaf(x86_feature); 203 204 reverse_cpuid_check(x86_leaf); 205 kvm_cpu_caps[x86_leaf] |= __feature_bit(x86_feature); 206 } 207 208 static __always_inline u32 kvm_cpu_cap_get(unsigned int x86_feature) 209 { 210 unsigned int x86_leaf = __feature_leaf(x86_feature); 211 212 reverse_cpuid_check(x86_leaf); 213 return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature); 214 } 215 216 static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature) 217 { 218 return !!kvm_cpu_cap_get(x86_feature); 219 } 220 221 static __always_inline void kvm_cpu_cap_check_and_set(unsigned int x86_feature) 222 { 223 if (boot_cpu_has(x86_feature)) 224 kvm_cpu_cap_set(x86_feature); 225 } 226 227 static __always_inline bool guest_pv_has(struct kvm_vcpu *vcpu, 228 unsigned int kvm_feature) 229 { 230 if (!vcpu->arch.pv_cpuid.enforce) 231 return true; 232 233 return vcpu->arch.pv_cpuid.features & (1u << kvm_feature); 234 } 235 236 enum kvm_governed_features { 237 #define KVM_GOVERNED_FEATURE(x) KVM_GOVERNED_##x, 238 #include "governed_features.h" 239 KVM_NR_GOVERNED_FEATURES 240 }; 241 242 static __always_inline int kvm_governed_feature_index(unsigned int x86_feature) 243 { 244 switch (x86_feature) { 245 #define KVM_GOVERNED_FEATURE(x) case x: return KVM_GOVERNED_##x; 246 #include "governed_features.h" 247 default: 248 return -1; 249 } 250 } 251 252 static __always_inline bool kvm_is_governed_feature(unsigned int x86_feature) 253 { 254 return kvm_governed_feature_index(x86_feature) >= 0; 255 } 256 257 static __always_inline void kvm_governed_feature_set(struct kvm_vcpu *vcpu, 258 unsigned int x86_feature) 259 { 260 BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature)); 261 262 __set_bit(kvm_governed_feature_index(x86_feature), 263 vcpu->arch.governed_features.enabled); 264 } 265 266 static __always_inline void kvm_governed_feature_check_and_set(struct kvm_vcpu *vcpu, 267 unsigned int x86_feature) 268 { 269 if (kvm_cpu_cap_has(x86_feature) && guest_cpuid_has(vcpu, x86_feature)) 270 kvm_governed_feature_set(vcpu, x86_feature); 271 } 272 273 static __always_inline bool guest_can_use(struct kvm_vcpu *vcpu, 274 unsigned int x86_feature) 275 { 276 BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature)); 277 278 return test_bit(kvm_governed_feature_index(x86_feature), 279 vcpu->arch.governed_features.enabled); 280 } 281 282 #endif 283