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 [CPUID_7_1_EAX] = { 7, 1, CPUID_EAX}, 57 }; 58 59 /* 60 * Reverse CPUID and its derivatives can only be used for hardware-defined 61 * feature words, i.e. words whose bits directly correspond to a CPUID leaf. 62 * Retrieving a feature bit or masking guest CPUID from a Linux-defined word 63 * is nonsensical as the bit number/mask is an arbitrary software-defined value 64 * and can't be used by KVM to query/control guest capabilities. And obviously 65 * the leaf being queried must have an entry in the lookup table. 66 */ 67 static __always_inline void reverse_cpuid_check(unsigned x86_leaf) 68 { 69 BUILD_BUG_ON(x86_leaf == CPUID_LNX_1); 70 BUILD_BUG_ON(x86_leaf == CPUID_LNX_2); 71 BUILD_BUG_ON(x86_leaf == CPUID_LNX_3); 72 BUILD_BUG_ON(x86_leaf == CPUID_LNX_4); 73 BUILD_BUG_ON(x86_leaf >= ARRAY_SIZE(reverse_cpuid)); 74 BUILD_BUG_ON(reverse_cpuid[x86_leaf].function == 0); 75 } 76 77 /* 78 * Retrieve the bit mask from an X86_FEATURE_* definition. Features contain 79 * the hardware defined bit number (stored in bits 4:0) and a software defined 80 * "word" (stored in bits 31:5). The word is used to index into arrays of 81 * bit masks that hold the per-cpu feature capabilities, e.g. this_cpu_has(). 82 */ 83 static __always_inline u32 __feature_bit(int x86_feature) 84 { 85 reverse_cpuid_check(x86_feature / 32); 86 return 1 << (x86_feature & 31); 87 } 88 89 #define feature_bit(name) __feature_bit(X86_FEATURE_##name) 90 91 static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned x86_feature) 92 { 93 unsigned x86_leaf = x86_feature / 32; 94 95 reverse_cpuid_check(x86_leaf); 96 return reverse_cpuid[x86_leaf]; 97 } 98 99 static __always_inline int *guest_cpuid_get_register(struct kvm_vcpu *vcpu, unsigned x86_feature) 100 { 101 struct kvm_cpuid_entry2 *entry; 102 const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature); 103 104 entry = kvm_find_cpuid_entry(vcpu, cpuid.function, cpuid.index); 105 if (!entry) 106 return NULL; 107 108 switch (cpuid.reg) { 109 case CPUID_EAX: 110 return &entry->eax; 111 case CPUID_EBX: 112 return &entry->ebx; 113 case CPUID_ECX: 114 return &entry->ecx; 115 case CPUID_EDX: 116 return &entry->edx; 117 default: 118 BUILD_BUG(); 119 return NULL; 120 } 121 } 122 123 static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu, unsigned x86_feature) 124 { 125 int *reg; 126 127 reg = guest_cpuid_get_register(vcpu, x86_feature); 128 if (!reg) 129 return false; 130 131 return *reg & __feature_bit(x86_feature); 132 } 133 134 static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu, unsigned x86_feature) 135 { 136 int *reg; 137 138 reg = guest_cpuid_get_register(vcpu, x86_feature); 139 if (reg) 140 *reg &= ~__feature_bit(x86_feature); 141 } 142 143 static inline bool guest_cpuid_is_amd(struct kvm_vcpu *vcpu) 144 { 145 struct kvm_cpuid_entry2 *best; 146 147 best = kvm_find_cpuid_entry(vcpu, 0, 0); 148 return best && best->ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx; 149 } 150 151 static inline int guest_cpuid_family(struct kvm_vcpu *vcpu) 152 { 153 struct kvm_cpuid_entry2 *best; 154 155 best = kvm_find_cpuid_entry(vcpu, 0x1, 0); 156 if (!best) 157 return -1; 158 159 return x86_family(best->eax); 160 } 161 162 static inline int guest_cpuid_model(struct kvm_vcpu *vcpu) 163 { 164 struct kvm_cpuid_entry2 *best; 165 166 best = kvm_find_cpuid_entry(vcpu, 0x1, 0); 167 if (!best) 168 return -1; 169 170 return x86_model(best->eax); 171 } 172 173 static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu) 174 { 175 struct kvm_cpuid_entry2 *best; 176 177 best = kvm_find_cpuid_entry(vcpu, 0x1, 0); 178 if (!best) 179 return -1; 180 181 return x86_stepping(best->eax); 182 } 183 184 static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu) 185 { 186 return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT; 187 } 188 189 static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu) 190 { 191 return vcpu->arch.msr_misc_features_enables & 192 MSR_MISC_FEATURES_ENABLES_CPUID_FAULT; 193 } 194 195 #endif 196