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 cpuid_maxphyaddr(struct kvm_vcpu * vcpu)40 static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu) 41 { 42 return vcpu->arch.maxphyaddr; 43 } 44 kvm_vcpu_is_legal_gpa(struct kvm_vcpu * vcpu,gpa_t gpa)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 kvm_vcpu_is_legal_aligned_gpa(struct kvm_vcpu * vcpu,gpa_t gpa,gpa_t alignment)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 page_address_valid(struct kvm_vcpu * vcpu,gpa_t gpa)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 cpuid_entry_override(struct kvm_cpuid_entry2 * entry,unsigned int leaf)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 guest_cpuid_get_register(struct kvm_vcpu * vcpu,unsigned int x86_feature)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 guest_cpuid_has(struct kvm_vcpu * vcpu,unsigned int x86_feature)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 guest_cpuid_clear(struct kvm_vcpu * vcpu,unsigned int x86_feature)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 guest_cpuid_is_amd_compatible(struct kvm_vcpu * vcpu)105 static inline bool guest_cpuid_is_amd_compatible(struct kvm_vcpu *vcpu) 106 { 107 return vcpu->arch.is_amd_compatible; 108 } 109 guest_cpuid_is_intel_compatible(struct kvm_vcpu * vcpu)110 static inline bool guest_cpuid_is_intel_compatible(struct kvm_vcpu *vcpu) 111 { 112 return !guest_cpuid_is_amd_compatible(vcpu); 113 } 114 guest_cpuid_family(struct kvm_vcpu * vcpu)115 static inline int guest_cpuid_family(struct kvm_vcpu *vcpu) 116 { 117 struct kvm_cpuid_entry2 *best; 118 119 best = kvm_find_cpuid_entry(vcpu, 0x1); 120 if (!best) 121 return -1; 122 123 return x86_family(best->eax); 124 } 125 guest_cpuid_model(struct kvm_vcpu * vcpu)126 static inline int guest_cpuid_model(struct kvm_vcpu *vcpu) 127 { 128 struct kvm_cpuid_entry2 *best; 129 130 best = kvm_find_cpuid_entry(vcpu, 0x1); 131 if (!best) 132 return -1; 133 134 return x86_model(best->eax); 135 } 136 cpuid_model_is_consistent(struct kvm_vcpu * vcpu)137 static inline bool cpuid_model_is_consistent(struct kvm_vcpu *vcpu) 138 { 139 return boot_cpu_data.x86_model == guest_cpuid_model(vcpu); 140 } 141 guest_cpuid_stepping(struct kvm_vcpu * vcpu)142 static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu) 143 { 144 struct kvm_cpuid_entry2 *best; 145 146 best = kvm_find_cpuid_entry(vcpu, 0x1); 147 if (!best) 148 return -1; 149 150 return x86_stepping(best->eax); 151 } 152 guest_has_spec_ctrl_msr(struct kvm_vcpu * vcpu)153 static inline bool guest_has_spec_ctrl_msr(struct kvm_vcpu *vcpu) 154 { 155 return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) || 156 guest_cpuid_has(vcpu, X86_FEATURE_AMD_STIBP) || 157 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS) || 158 guest_cpuid_has(vcpu, X86_FEATURE_AMD_SSBD)); 159 } 160 guest_has_pred_cmd_msr(struct kvm_vcpu * vcpu)161 static inline bool guest_has_pred_cmd_msr(struct kvm_vcpu *vcpu) 162 { 163 return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) || 164 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB) || 165 guest_cpuid_has(vcpu, X86_FEATURE_SBPB)); 166 } 167 supports_cpuid_fault(struct kvm_vcpu * vcpu)168 static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu) 169 { 170 return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT; 171 } 172 cpuid_fault_enabled(struct kvm_vcpu * vcpu)173 static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu) 174 { 175 return vcpu->arch.msr_misc_features_enables & 176 MSR_MISC_FEATURES_ENABLES_CPUID_FAULT; 177 } 178 kvm_cpu_cap_clear(unsigned int x86_feature)179 static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature) 180 { 181 unsigned int x86_leaf = __feature_leaf(x86_feature); 182 183 reverse_cpuid_check(x86_leaf); 184 kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature); 185 } 186 kvm_cpu_cap_set(unsigned int x86_feature)187 static __always_inline void kvm_cpu_cap_set(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 kvm_cpu_cap_get(unsigned int x86_feature)195 static __always_inline u32 kvm_cpu_cap_get(unsigned int x86_feature) 196 { 197 unsigned int x86_leaf = __feature_leaf(x86_feature); 198 199 reverse_cpuid_check(x86_leaf); 200 return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature); 201 } 202 kvm_cpu_cap_has(unsigned int x86_feature)203 static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature) 204 { 205 return !!kvm_cpu_cap_get(x86_feature); 206 } 207 kvm_cpu_cap_check_and_set(unsigned int x86_feature)208 static __always_inline void kvm_cpu_cap_check_and_set(unsigned int x86_feature) 209 { 210 if (boot_cpu_has(x86_feature)) 211 kvm_cpu_cap_set(x86_feature); 212 } 213 guest_pv_has(struct kvm_vcpu * vcpu,unsigned int kvm_feature)214 static __always_inline bool guest_pv_has(struct kvm_vcpu *vcpu, 215 unsigned int kvm_feature) 216 { 217 if (!vcpu->arch.pv_cpuid.enforce) 218 return true; 219 220 return vcpu->arch.pv_cpuid.features & (1u << kvm_feature); 221 } 222 223 enum kvm_governed_features { 224 #define KVM_GOVERNED_FEATURE(x) KVM_GOVERNED_##x, 225 #include "governed_features.h" 226 KVM_NR_GOVERNED_FEATURES 227 }; 228 kvm_governed_feature_index(unsigned int x86_feature)229 static __always_inline int kvm_governed_feature_index(unsigned int x86_feature) 230 { 231 switch (x86_feature) { 232 #define KVM_GOVERNED_FEATURE(x) case x: return KVM_GOVERNED_##x; 233 #include "governed_features.h" 234 default: 235 return -1; 236 } 237 } 238 kvm_is_governed_feature(unsigned int x86_feature)239 static __always_inline bool kvm_is_governed_feature(unsigned int x86_feature) 240 { 241 return kvm_governed_feature_index(x86_feature) >= 0; 242 } 243 kvm_governed_feature_set(struct kvm_vcpu * vcpu,unsigned int x86_feature)244 static __always_inline void kvm_governed_feature_set(struct kvm_vcpu *vcpu, 245 unsigned int x86_feature) 246 { 247 BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature)); 248 249 __set_bit(kvm_governed_feature_index(x86_feature), 250 vcpu->arch.governed_features.enabled); 251 } 252 kvm_governed_feature_check_and_set(struct kvm_vcpu * vcpu,unsigned int x86_feature)253 static __always_inline void kvm_governed_feature_check_and_set(struct kvm_vcpu *vcpu, 254 unsigned int x86_feature) 255 { 256 if (kvm_cpu_cap_has(x86_feature) && guest_cpuid_has(vcpu, x86_feature)) 257 kvm_governed_feature_set(vcpu, x86_feature); 258 } 259 guest_can_use(struct kvm_vcpu * vcpu,unsigned int x86_feature)260 static __always_inline bool guest_can_use(struct kvm_vcpu *vcpu, 261 unsigned int x86_feature) 262 { 263 BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature)); 264 265 return test_bit(kvm_governed_feature_index(x86_feature), 266 vcpu->arch.governed_features.enabled); 267 } 268 kvm_vcpu_is_legal_cr3(struct kvm_vcpu * vcpu,unsigned long cr3)269 static inline bool kvm_vcpu_is_legal_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) 270 { 271 if (guest_can_use(vcpu, X86_FEATURE_LAM)) 272 cr3 &= ~(X86_CR3_LAM_U48 | X86_CR3_LAM_U57); 273 274 return kvm_vcpu_is_legal_gpa(vcpu, cr3); 275 } 276 277 #endif 278