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_8000_0008_EBX] = {0x80000008, 0, CPUID_EBX}, 51 [CPUID_6_EAX] = { 6, 0, CPUID_EAX}, 52 [CPUID_8000_000A_EDX] = {0x8000000a, 0, CPUID_EDX}, 53 [CPUID_7_ECX] = { 7, 0, CPUID_ECX}, 54 [CPUID_8000_0007_EBX] = {0x80000007, 0, CPUID_EBX}, 55 [CPUID_7_EDX] = { 7, 0, CPUID_EDX}, 56 }; 57 58 static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned x86_feature) 59 { 60 unsigned x86_leaf = x86_feature / 32; 61 62 BUILD_BUG_ON(x86_leaf >= ARRAY_SIZE(reverse_cpuid)); 63 BUILD_BUG_ON(reverse_cpuid[x86_leaf].function == 0); 64 65 return reverse_cpuid[x86_leaf]; 66 } 67 68 static __always_inline int *guest_cpuid_get_register(struct kvm_vcpu *vcpu, unsigned x86_feature) 69 { 70 struct kvm_cpuid_entry2 *entry; 71 const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature); 72 73 entry = kvm_find_cpuid_entry(vcpu, cpuid.function, cpuid.index); 74 if (!entry) 75 return NULL; 76 77 switch (cpuid.reg) { 78 case CPUID_EAX: 79 return &entry->eax; 80 case CPUID_EBX: 81 return &entry->ebx; 82 case CPUID_ECX: 83 return &entry->ecx; 84 case CPUID_EDX: 85 return &entry->edx; 86 default: 87 BUILD_BUG(); 88 return NULL; 89 } 90 } 91 92 static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu, unsigned x86_feature) 93 { 94 int *reg; 95 96 if (x86_feature == X86_FEATURE_XSAVE && 97 !static_cpu_has(X86_FEATURE_XSAVE)) 98 return false; 99 100 reg = guest_cpuid_get_register(vcpu, x86_feature); 101 if (!reg) 102 return false; 103 104 return *reg & bit(x86_feature); 105 } 106 107 static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu, unsigned x86_feature) 108 { 109 int *reg; 110 111 reg = guest_cpuid_get_register(vcpu, x86_feature); 112 if (reg) 113 *reg &= ~bit(x86_feature); 114 } 115 116 static inline bool guest_cpuid_is_amd(struct kvm_vcpu *vcpu) 117 { 118 struct kvm_cpuid_entry2 *best; 119 120 best = kvm_find_cpuid_entry(vcpu, 0, 0); 121 return best && best->ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx; 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 supports_cpuid_fault(struct kvm_vcpu *vcpu) 158 { 159 return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT; 160 } 161 162 static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu) 163 { 164 return vcpu->arch.msr_misc_features_enables & 165 MSR_MISC_FEATURES_ENABLES_CPUID_FAULT; 166 } 167 168 #endif 169