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 int guest_cpuid_family(struct kvm_vcpu *vcpu) 124 { 125 struct kvm_cpuid_entry2 *best; 126 127 best = kvm_find_cpuid_entry(vcpu, 0x1); 128 if (!best) 129 return -1; 130 131 return x86_family(best->eax); 132 } 133 134 static inline int guest_cpuid_model(struct kvm_vcpu *vcpu) 135 { 136 struct kvm_cpuid_entry2 *best; 137 138 best = kvm_find_cpuid_entry(vcpu, 0x1); 139 if (!best) 140 return -1; 141 142 return x86_model(best->eax); 143 } 144 145 static inline bool cpuid_model_is_consistent(struct kvm_vcpu *vcpu) 146 { 147 return boot_cpu_data.x86_model == guest_cpuid_model(vcpu); 148 } 149 150 static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu) 151 { 152 struct kvm_cpuid_entry2 *best; 153 154 best = kvm_find_cpuid_entry(vcpu, 0x1); 155 if (!best) 156 return -1; 157 158 return x86_stepping(best->eax); 159 } 160 161 static inline bool guest_has_spec_ctrl_msr(struct kvm_vcpu *vcpu) 162 { 163 return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) || 164 guest_cpuid_has(vcpu, X86_FEATURE_AMD_STIBP) || 165 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS) || 166 guest_cpuid_has(vcpu, X86_FEATURE_AMD_SSBD)); 167 } 168 169 static inline bool guest_has_pred_cmd_msr(struct kvm_vcpu *vcpu) 170 { 171 return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) || 172 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB) || 173 guest_cpuid_has(vcpu, X86_FEATURE_SBPB)); 174 } 175 176 static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu) 177 { 178 return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT; 179 } 180 181 static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu) 182 { 183 return vcpu->arch.msr_misc_features_enables & 184 MSR_MISC_FEATURES_ENABLES_CPUID_FAULT; 185 } 186 187 static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature) 188 { 189 unsigned int x86_leaf = __feature_leaf(x86_feature); 190 191 reverse_cpuid_check(x86_leaf); 192 kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature); 193 } 194 195 static __always_inline void kvm_cpu_cap_set(unsigned int x86_feature) 196 { 197 unsigned int x86_leaf = __feature_leaf(x86_feature); 198 199 reverse_cpuid_check(x86_leaf); 200 kvm_cpu_caps[x86_leaf] |= __feature_bit(x86_feature); 201 } 202 203 static __always_inline u32 kvm_cpu_cap_get(unsigned int x86_feature) 204 { 205 unsigned int x86_leaf = __feature_leaf(x86_feature); 206 207 reverse_cpuid_check(x86_leaf); 208 return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature); 209 } 210 211 static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature) 212 { 213 return !!kvm_cpu_cap_get(x86_feature); 214 } 215 216 static __always_inline void kvm_cpu_cap_check_and_set(unsigned int x86_feature) 217 { 218 if (boot_cpu_has(x86_feature)) 219 kvm_cpu_cap_set(x86_feature); 220 } 221 222 static __always_inline bool guest_pv_has(struct kvm_vcpu *vcpu, 223 unsigned int kvm_feature) 224 { 225 if (!vcpu->arch.pv_cpuid.enforce) 226 return true; 227 228 return vcpu->arch.pv_cpuid.features & (1u << kvm_feature); 229 } 230 231 enum kvm_governed_features { 232 #define KVM_GOVERNED_FEATURE(x) KVM_GOVERNED_##x, 233 #include "governed_features.h" 234 KVM_NR_GOVERNED_FEATURES 235 }; 236 237 static __always_inline int kvm_governed_feature_index(unsigned int x86_feature) 238 { 239 switch (x86_feature) { 240 #define KVM_GOVERNED_FEATURE(x) case x: return KVM_GOVERNED_##x; 241 #include "governed_features.h" 242 default: 243 return -1; 244 } 245 } 246 247 static __always_inline bool kvm_is_governed_feature(unsigned int x86_feature) 248 { 249 return kvm_governed_feature_index(x86_feature) >= 0; 250 } 251 252 static __always_inline void kvm_governed_feature_set(struct kvm_vcpu *vcpu, 253 unsigned int x86_feature) 254 { 255 BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature)); 256 257 __set_bit(kvm_governed_feature_index(x86_feature), 258 vcpu->arch.governed_features.enabled); 259 } 260 261 static __always_inline void kvm_governed_feature_check_and_set(struct kvm_vcpu *vcpu, 262 unsigned int x86_feature) 263 { 264 if (kvm_cpu_cap_has(x86_feature) && guest_cpuid_has(vcpu, x86_feature)) 265 kvm_governed_feature_set(vcpu, x86_feature); 266 } 267 268 static __always_inline bool guest_can_use(struct kvm_vcpu *vcpu, 269 unsigned int x86_feature) 270 { 271 BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature)); 272 273 return test_bit(kvm_governed_feature_index(x86_feature), 274 vcpu->arch.governed_features.enabled); 275 } 276 277 static inline bool kvm_vcpu_is_legal_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) 278 { 279 if (guest_can_use(vcpu, X86_FEATURE_LAM)) 280 cr3 &= ~(X86_CR3_LAM_U48 | X86_CR3_LAM_U57); 281 282 return kvm_vcpu_is_legal_gpa(vcpu, cr3); 283 } 284 285 #endif 286