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 11extern u32 kvm_cpu_caps[NR_KVM_CPU_CAPS] __read_mostly; 12void kvm_set_cpu_caps(void); 13 14void kvm_update_cpuid_runtime(struct kvm_vcpu *vcpu); 15void kvm_update_pv_runtime(struct kvm_vcpu *vcpu); 16struct kvm_cpuid_entry2 *kvm_find_cpuid_entry_index(struct kvm_vcpu *vcpu, 17 u32 function, u32 index); 18struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu, 19 u32 function); 20int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid, 21 struct kvm_cpuid_entry2 __user *entries, 22 unsigned int type); 23int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu, 24 struct kvm_cpuid *cpuid, 25 struct kvm_cpuid_entry __user *entries); 26int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu, 27 struct kvm_cpuid2 *cpuid, 28 struct kvm_cpuid_entry2 __user *entries); 29int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu, 30 struct kvm_cpuid2 *cpuid, 31 struct kvm_cpuid_entry2 __user *entries); 32bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx, 33 u32 *ecx, u32 *edx, bool exact_only); 34 35u32 xstate_required_size(u64 xstate_bv, bool compacted); 36 37int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu); 38u64 kvm_vcpu_reserved_gpa_bits_raw(struct kvm_vcpu *vcpu); 39 40static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu) 41{ 42 return vcpu->arch.maxphyaddr; 43} 44 45static 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 50static 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 55static 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 61static 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 66static __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 75static __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 88static __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 100static __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 110static 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 120static 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 128static 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 139static 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 150static inline bool cpuid_model_is_consistent(struct kvm_vcpu *vcpu) 151{ 152 return boot_cpu_data.x86_model == guest_cpuid_model(vcpu); 153} 154 155static 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 166static 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 174static 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} 179 180static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu) 181{ 182 return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT; 183} 184 185static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu) 186{ 187 return vcpu->arch.msr_misc_features_enables & 188 MSR_MISC_FEATURES_ENABLES_CPUID_FAULT; 189} 190 191static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature) 192{ 193 unsigned int x86_leaf = __feature_leaf(x86_feature); 194 195 reverse_cpuid_check(x86_leaf); 196 kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature); 197} 198 199static __always_inline void kvm_cpu_cap_set(unsigned int x86_feature) 200{ 201 unsigned int x86_leaf = __feature_leaf(x86_feature); 202 203 reverse_cpuid_check(x86_leaf); 204 kvm_cpu_caps[x86_leaf] |= __feature_bit(x86_feature); 205} 206 207static __always_inline u32 kvm_cpu_cap_get(unsigned int x86_feature) 208{ 209 unsigned int x86_leaf = __feature_leaf(x86_feature); 210 211 reverse_cpuid_check(x86_leaf); 212 return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature); 213} 214 215static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature) 216{ 217 return !!kvm_cpu_cap_get(x86_feature); 218} 219 220static __always_inline void kvm_cpu_cap_check_and_set(unsigned int x86_feature) 221{ 222 if (boot_cpu_has(x86_feature)) 223 kvm_cpu_cap_set(x86_feature); 224} 225 226static __always_inline bool guest_pv_has(struct kvm_vcpu *vcpu, 227 unsigned int kvm_feature) 228{ 229 if (!vcpu->arch.pv_cpuid.enforce) 230 return true; 231 232 return vcpu->arch.pv_cpuid.features & (1u << kvm_feature); 233} 234 235enum kvm_governed_features { 236#define KVM_GOVERNED_FEATURE(x) KVM_GOVERNED_##x, 237#include "governed_features.h" 238 KVM_NR_GOVERNED_FEATURES 239}; 240 241static __always_inline int kvm_governed_feature_index(unsigned int x86_feature) 242{ 243 switch (x86_feature) { 244#define KVM_GOVERNED_FEATURE(x) case x: return KVM_GOVERNED_##x; 245#include "governed_features.h" 246 default: 247 return -1; 248 } 249} 250 251static __always_inline bool kvm_is_governed_feature(unsigned int x86_feature) 252{ 253 return kvm_governed_feature_index(x86_feature) >= 0; 254} 255 256static __always_inline void kvm_governed_feature_set(struct kvm_vcpu *vcpu, 257 unsigned int x86_feature) 258{ 259 BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature)); 260 261 __set_bit(kvm_governed_feature_index(x86_feature), 262 vcpu->arch.governed_features.enabled); 263} 264 265static __always_inline void kvm_governed_feature_check_and_set(struct kvm_vcpu *vcpu, 266 unsigned int x86_feature) 267{ 268 if (kvm_cpu_cap_has(x86_feature) && guest_cpuid_has(vcpu, x86_feature)) 269 kvm_governed_feature_set(vcpu, x86_feature); 270} 271 272static __always_inline bool guest_can_use(struct kvm_vcpu *vcpu, 273 unsigned int x86_feature) 274{ 275 BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature)); 276 277 return test_bit(kvm_governed_feature_index(x86_feature), 278 vcpu->arch.governed_features.enabled); 279} 280 281#endif 282