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] = {0xc0000001, 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 }; 58 59 static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned x86_feature) 60 { 61 unsigned x86_leaf = x86_feature / 32; 62 63 BUILD_BUG_ON(x86_leaf >= ARRAY_SIZE(reverse_cpuid)); 64 BUILD_BUG_ON(reverse_cpuid[x86_leaf].function == 0); 65 66 return reverse_cpuid[x86_leaf]; 67 } 68 69 static __always_inline int *guest_cpuid_get_register(struct kvm_vcpu *vcpu, unsigned x86_feature) 70 { 71 struct kvm_cpuid_entry2 *entry; 72 const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature); 73 74 entry = kvm_find_cpuid_entry(vcpu, cpuid.function, cpuid.index); 75 if (!entry) 76 return NULL; 77 78 switch (cpuid.reg) { 79 case CPUID_EAX: 80 return &entry->eax; 81 case CPUID_EBX: 82 return &entry->ebx; 83 case CPUID_ECX: 84 return &entry->ecx; 85 case CPUID_EDX: 86 return &entry->edx; 87 default: 88 BUILD_BUG(); 89 return NULL; 90 } 91 } 92 93 static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu, unsigned x86_feature) 94 { 95 int *reg; 96 97 if (x86_feature == X86_FEATURE_XSAVE && 98 !static_cpu_has(X86_FEATURE_XSAVE)) 99 return false; 100 101 reg = guest_cpuid_get_register(vcpu, x86_feature); 102 if (!reg) 103 return false; 104 105 return *reg & bit(x86_feature); 106 } 107 108 static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu, unsigned x86_feature) 109 { 110 int *reg; 111 112 reg = guest_cpuid_get_register(vcpu, x86_feature); 113 if (reg) 114 *reg &= ~bit(x86_feature); 115 } 116 117 static inline bool guest_cpuid_is_amd(struct kvm_vcpu *vcpu) 118 { 119 struct kvm_cpuid_entry2 *best; 120 121 best = kvm_find_cpuid_entry(vcpu, 0, 0); 122 return best && best->ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx; 123 } 124 125 static inline int guest_cpuid_family(struct kvm_vcpu *vcpu) 126 { 127 struct kvm_cpuid_entry2 *best; 128 129 best = kvm_find_cpuid_entry(vcpu, 0x1, 0); 130 if (!best) 131 return -1; 132 133 return x86_family(best->eax); 134 } 135 136 static inline int guest_cpuid_model(struct kvm_vcpu *vcpu) 137 { 138 struct kvm_cpuid_entry2 *best; 139 140 best = kvm_find_cpuid_entry(vcpu, 0x1, 0); 141 if (!best) 142 return -1; 143 144 return x86_model(best->eax); 145 } 146 147 static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu) 148 { 149 struct kvm_cpuid_entry2 *best; 150 151 best = kvm_find_cpuid_entry(vcpu, 0x1, 0); 152 if (!best) 153 return -1; 154 155 return x86_stepping(best->eax); 156 } 157 158 static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu) 159 { 160 return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT; 161 } 162 163 static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu) 164 { 165 return vcpu->arch.msr_misc_features_enables & 166 MSR_MISC_FEATURES_ENABLES_CPUID_FAULT; 167 } 168 169 #endif 170