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 <asm/cpu.h> 7 #include <asm/processor.h> 8 9 int kvm_update_cpuid(struct kvm_vcpu *vcpu); 10 bool kvm_mpx_supported(void); 11 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu, 12 u32 function, u32 index); 13 int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid, 14 struct kvm_cpuid_entry2 __user *entries, 15 unsigned int type); 16 int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu, 17 struct kvm_cpuid *cpuid, 18 struct kvm_cpuid_entry __user *entries); 19 int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu, 20 struct kvm_cpuid2 *cpuid, 21 struct kvm_cpuid_entry2 __user *entries); 22 int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu, 23 struct kvm_cpuid2 *cpuid, 24 struct kvm_cpuid_entry2 __user *entries); 25 bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx, 26 u32 *ecx, u32 *edx, bool check_limit); 27 28 int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu); 29 30 static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu) 31 { 32 return vcpu->arch.maxphyaddr; 33 } 34 35 struct cpuid_reg { 36 u32 function; 37 u32 index; 38 int reg; 39 }; 40 41 static const struct cpuid_reg reverse_cpuid[] = { 42 [CPUID_1_EDX] = { 1, 0, CPUID_EDX}, 43 [CPUID_8000_0001_EDX] = {0x80000001, 0, CPUID_EDX}, 44 [CPUID_8086_0001_EDX] = {0x80860001, 0, CPUID_EDX}, 45 [CPUID_1_ECX] = { 1, 0, CPUID_ECX}, 46 [CPUID_C000_0001_EDX] = {0xc0000001, 0, CPUID_EDX}, 47 [CPUID_8000_0001_ECX] = {0x80000001, 0, CPUID_ECX}, 48 [CPUID_7_0_EBX] = { 7, 0, CPUID_EBX}, 49 [CPUID_D_1_EAX] = { 0xd, 1, CPUID_EAX}, 50 [CPUID_F_0_EDX] = { 0xf, 0, CPUID_EDX}, 51 [CPUID_F_1_EDX] = { 0xf, 1, CPUID_EDX}, 52 [CPUID_8000_0008_EBX] = {0x80000008, 0, CPUID_EBX}, 53 [CPUID_6_EAX] = { 6, 0, CPUID_EAX}, 54 [CPUID_8000_000A_EDX] = {0x8000000a, 0, CPUID_EDX}, 55 [CPUID_7_ECX] = { 7, 0, CPUID_ECX}, 56 [CPUID_8000_0007_EBX] = {0x80000007, 0, CPUID_EBX}, 57 [CPUID_7_EDX] = { 7, 0, CPUID_EDX}, 58 }; 59 60 static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned x86_feature) 61 { 62 unsigned x86_leaf = x86_feature / 32; 63 64 BUILD_BUG_ON(x86_leaf >= ARRAY_SIZE(reverse_cpuid)); 65 BUILD_BUG_ON(reverse_cpuid[x86_leaf].function == 0); 66 67 return reverse_cpuid[x86_leaf]; 68 } 69 70 static __always_inline int *guest_cpuid_get_register(struct kvm_vcpu *vcpu, unsigned x86_feature) 71 { 72 struct kvm_cpuid_entry2 *entry; 73 const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature); 74 75 entry = kvm_find_cpuid_entry(vcpu, cpuid.function, cpuid.index); 76 if (!entry) 77 return NULL; 78 79 switch (cpuid.reg) { 80 case CPUID_EAX: 81 return &entry->eax; 82 case CPUID_EBX: 83 return &entry->ebx; 84 case CPUID_ECX: 85 return &entry->ecx; 86 case CPUID_EDX: 87 return &entry->edx; 88 default: 89 BUILD_BUG(); 90 return NULL; 91 } 92 } 93 94 static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu, unsigned x86_feature) 95 { 96 int *reg; 97 98 if (x86_feature == X86_FEATURE_XSAVE && 99 !static_cpu_has(X86_FEATURE_XSAVE)) 100 return false; 101 102 reg = guest_cpuid_get_register(vcpu, x86_feature); 103 if (!reg) 104 return false; 105 106 return *reg & bit(x86_feature); 107 } 108 109 static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu, unsigned x86_feature) 110 { 111 int *reg; 112 113 reg = guest_cpuid_get_register(vcpu, x86_feature); 114 if (reg) 115 *reg &= ~bit(x86_feature); 116 } 117 118 static inline bool guest_cpuid_is_amd(struct kvm_vcpu *vcpu) 119 { 120 struct kvm_cpuid_entry2 *best; 121 122 best = kvm_find_cpuid_entry(vcpu, 0, 0); 123 return best && best->ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx; 124 } 125 126 static inline int guest_cpuid_family(struct kvm_vcpu *vcpu) 127 { 128 struct kvm_cpuid_entry2 *best; 129 130 best = kvm_find_cpuid_entry(vcpu, 0x1, 0); 131 if (!best) 132 return -1; 133 134 return x86_family(best->eax); 135 } 136 137 static inline int guest_cpuid_model(struct kvm_vcpu *vcpu) 138 { 139 struct kvm_cpuid_entry2 *best; 140 141 best = kvm_find_cpuid_entry(vcpu, 0x1, 0); 142 if (!best) 143 return -1; 144 145 return x86_model(best->eax); 146 } 147 148 static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu) 149 { 150 struct kvm_cpuid_entry2 *best; 151 152 best = kvm_find_cpuid_entry(vcpu, 0x1, 0); 153 if (!best) 154 return -1; 155 156 return x86_stepping(best->eax); 157 } 158 159 static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu) 160 { 161 return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT; 162 } 163 164 static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu) 165 { 166 return vcpu->arch.msr_misc_features_enables & 167 MSR_MISC_FEATURES_ENABLES_CPUID_FAULT; 168 } 169 170 #endif 171