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(struct kvm_vcpu *vcpu, 17 u32 function, u32 index); 18 int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid, 19 struct kvm_cpuid_entry2 __user *entries, 20 unsigned int type); 21 int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu, 22 struct kvm_cpuid *cpuid, 23 struct kvm_cpuid_entry __user *entries); 24 int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu, 25 struct kvm_cpuid2 *cpuid, 26 struct kvm_cpuid_entry2 __user *entries); 27 int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu, 28 struct kvm_cpuid2 *cpuid, 29 struct kvm_cpuid_entry2 __user *entries); 30 bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx, 31 u32 *ecx, u32 *edx, bool exact_only); 32 33 int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu); 34 u64 kvm_vcpu_reserved_gpa_bits_raw(struct kvm_vcpu *vcpu); 35 36 static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu) 37 { 38 return vcpu->arch.maxphyaddr; 39 } 40 41 static inline bool kvm_vcpu_is_legal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa) 42 { 43 return !(gpa & vcpu->arch.reserved_gpa_bits); 44 } 45 46 static inline bool kvm_vcpu_is_illegal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa) 47 { 48 return !kvm_vcpu_is_legal_gpa(vcpu, gpa); 49 } 50 51 static inline bool kvm_vcpu_is_legal_aligned_gpa(struct kvm_vcpu *vcpu, 52 gpa_t gpa, gpa_t alignment) 53 { 54 return IS_ALIGNED(gpa, alignment) && kvm_vcpu_is_legal_gpa(vcpu, gpa); 55 } 56 57 static inline bool page_address_valid(struct kvm_vcpu *vcpu, gpa_t gpa) 58 { 59 return kvm_vcpu_is_legal_aligned_gpa(vcpu, gpa, PAGE_SIZE); 60 } 61 62 static __always_inline void cpuid_entry_override(struct kvm_cpuid_entry2 *entry, 63 unsigned int leaf) 64 { 65 u32 *reg = cpuid_entry_get_reg(entry, leaf * 32); 66 67 BUILD_BUG_ON(leaf >= ARRAY_SIZE(kvm_cpu_caps)); 68 *reg = kvm_cpu_caps[leaf]; 69 } 70 71 static __always_inline u32 *guest_cpuid_get_register(struct kvm_vcpu *vcpu, 72 unsigned int x86_feature) 73 { 74 const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature); 75 struct kvm_cpuid_entry2 *entry; 76 77 entry = kvm_find_cpuid_entry(vcpu, cpuid.function, cpuid.index); 78 if (!entry) 79 return NULL; 80 81 return __cpuid_entry_get_reg(entry, cpuid.reg); 82 } 83 84 static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu, 85 unsigned int x86_feature) 86 { 87 u32 *reg; 88 89 reg = guest_cpuid_get_register(vcpu, x86_feature); 90 if (!reg) 91 return false; 92 93 return *reg & __feature_bit(x86_feature); 94 } 95 96 static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu, 97 unsigned int x86_feature) 98 { 99 u32 *reg; 100 101 reg = guest_cpuid_get_register(vcpu, x86_feature); 102 if (reg) 103 *reg &= ~__feature_bit(x86_feature); 104 } 105 106 static inline bool guest_cpuid_is_amd_or_hygon(struct kvm_vcpu *vcpu) 107 { 108 struct kvm_cpuid_entry2 *best; 109 110 best = kvm_find_cpuid_entry(vcpu, 0, 0); 111 return best && 112 (is_guest_vendor_amd(best->ebx, best->ecx, best->edx) || 113 is_guest_vendor_hygon(best->ebx, best->ecx, best->edx)); 114 } 115 116 static inline bool guest_cpuid_is_intel(struct kvm_vcpu *vcpu) 117 { 118 struct kvm_cpuid_entry2 *best; 119 120 best = kvm_find_cpuid_entry(vcpu, 0, 0); 121 return best && is_guest_vendor_intel(best->ebx, best->ecx, best->edx); 122 } 123 124 static inline int guest_cpuid_family(struct kvm_vcpu *vcpu) 125 { 126 struct kvm_cpuid_entry2 *best; 127 128 best = kvm_find_cpuid_entry(vcpu, 0x1, 0); 129 if (!best) 130 return -1; 131 132 return x86_family(best->eax); 133 } 134 135 static inline int guest_cpuid_model(struct kvm_vcpu *vcpu) 136 { 137 struct kvm_cpuid_entry2 *best; 138 139 best = kvm_find_cpuid_entry(vcpu, 0x1, 0); 140 if (!best) 141 return -1; 142 143 return x86_model(best->eax); 144 } 145 146 static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu) 147 { 148 struct kvm_cpuid_entry2 *best; 149 150 best = kvm_find_cpuid_entry(vcpu, 0x1, 0); 151 if (!best) 152 return -1; 153 154 return x86_stepping(best->eax); 155 } 156 157 static inline bool guest_has_spec_ctrl_msr(struct kvm_vcpu *vcpu) 158 { 159 return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) || 160 guest_cpuid_has(vcpu, X86_FEATURE_AMD_STIBP) || 161 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS) || 162 guest_cpuid_has(vcpu, X86_FEATURE_AMD_SSBD)); 163 } 164 165 static inline bool guest_has_pred_cmd_msr(struct kvm_vcpu *vcpu) 166 { 167 return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) || 168 guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB)); 169 } 170 171 static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu) 172 { 173 return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT; 174 } 175 176 static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu) 177 { 178 return vcpu->arch.msr_misc_features_enables & 179 MSR_MISC_FEATURES_ENABLES_CPUID_FAULT; 180 } 181 182 static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature) 183 { 184 unsigned int x86_leaf = __feature_leaf(x86_feature); 185 186 reverse_cpuid_check(x86_leaf); 187 kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature); 188 } 189 190 static __always_inline void kvm_cpu_cap_set(unsigned int x86_feature) 191 { 192 unsigned int x86_leaf = __feature_leaf(x86_feature); 193 194 reverse_cpuid_check(x86_leaf); 195 kvm_cpu_caps[x86_leaf] |= __feature_bit(x86_feature); 196 } 197 198 static __always_inline u32 kvm_cpu_cap_get(unsigned int x86_feature) 199 { 200 unsigned int x86_leaf = __feature_leaf(x86_feature); 201 202 reverse_cpuid_check(x86_leaf); 203 return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature); 204 } 205 206 static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature) 207 { 208 return !!kvm_cpu_cap_get(x86_feature); 209 } 210 211 static __always_inline void kvm_cpu_cap_check_and_set(unsigned int x86_feature) 212 { 213 if (boot_cpu_has(x86_feature)) 214 kvm_cpu_cap_set(x86_feature); 215 } 216 217 static __always_inline bool guest_pv_has(struct kvm_vcpu *vcpu, 218 unsigned int kvm_feature) 219 { 220 if (!vcpu->arch.pv_cpuid.enforce) 221 return true; 222 223 return vcpu->arch.pv_cpuid.features & (1u << kvm_feature); 224 } 225 226 #endif 227