| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef ARCH_X86_KVM_CPUID_H |
| #define ARCH_X86_KVM_CPUID_H |
| |
| #include "x86.h" |
| #include "reverse_cpuid.h" |
| #include <asm/cpu.h> |
| #include <asm/processor.h> |
| #include <uapi/asm/kvm_para.h> |
| |
| extern u32 kvm_cpu_caps[NR_KVM_CPU_CAPS] __read_mostly; |
| void kvm_set_cpu_caps(void); |
| |
| void kvm_update_cpuid_runtime(struct kvm_vcpu *vcpu); |
| void kvm_update_pv_runtime(struct kvm_vcpu *vcpu); |
| struct kvm_cpuid_entry2 *kvm_find_cpuid_entry_index(struct kvm_vcpu *vcpu, |
| u32 function, u32 index); |
| struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu, |
| u32 function); |
| int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid, |
| struct kvm_cpuid_entry2 __user *entries, |
| unsigned int type); |
| int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu, |
| struct kvm_cpuid *cpuid, |
| struct kvm_cpuid_entry __user *entries); |
| int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu, |
| struct kvm_cpuid2 *cpuid, |
| struct kvm_cpuid_entry2 __user *entries); |
| int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu, |
| struct kvm_cpuid2 *cpuid, |
| struct kvm_cpuid_entry2 __user *entries); |
| bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx, |
| u32 *ecx, u32 *edx, bool exact_only); |
| |
| u32 xstate_required_size(u64 xstate_bv, bool compacted); |
| |
| int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu); |
| u64 kvm_vcpu_reserved_gpa_bits_raw(struct kvm_vcpu *vcpu); |
| |
| static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu) |
| { |
| return vcpu->arch.maxphyaddr; |
| } |
| |
| static inline bool kvm_vcpu_is_legal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa) |
| { |
| return !(gpa & vcpu->arch.reserved_gpa_bits); |
| } |
| |
| static inline bool kvm_vcpu_is_illegal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa) |
| { |
| return !kvm_vcpu_is_legal_gpa(vcpu, gpa); |
| } |
| |
| static inline bool kvm_vcpu_is_legal_aligned_gpa(struct kvm_vcpu *vcpu, |
| gpa_t gpa, gpa_t alignment) |
| { |
| return IS_ALIGNED(gpa, alignment) && kvm_vcpu_is_legal_gpa(vcpu, gpa); |
| } |
| |
| static inline bool page_address_valid(struct kvm_vcpu *vcpu, gpa_t gpa) |
| { |
| return kvm_vcpu_is_legal_aligned_gpa(vcpu, gpa, PAGE_SIZE); |
| } |
| |
| static __always_inline void cpuid_entry_override(struct kvm_cpuid_entry2 *entry, |
| unsigned int leaf) |
| { |
| u32 *reg = cpuid_entry_get_reg(entry, leaf * 32); |
| |
| BUILD_BUG_ON(leaf >= ARRAY_SIZE(kvm_cpu_caps)); |
| *reg = kvm_cpu_caps[leaf]; |
| } |
| |
| static __always_inline u32 *guest_cpuid_get_register(struct kvm_vcpu *vcpu, |
| unsigned int x86_feature) |
| { |
| const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature); |
| struct kvm_cpuid_entry2 *entry; |
| |
| entry = kvm_find_cpuid_entry_index(vcpu, cpuid.function, cpuid.index); |
| if (!entry) |
| return NULL; |
| |
| return __cpuid_entry_get_reg(entry, cpuid.reg); |
| } |
| |
| static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu, |
| unsigned int x86_feature) |
| { |
| u32 *reg; |
| |
| reg = guest_cpuid_get_register(vcpu, x86_feature); |
| if (!reg) |
| return false; |
| |
| return *reg & __feature_bit(x86_feature); |
| } |
| |
| static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu, |
| unsigned int x86_feature) |
| { |
| u32 *reg; |
| |
| reg = guest_cpuid_get_register(vcpu, x86_feature); |
| if (reg) |
| *reg &= ~__feature_bit(x86_feature); |
| } |
| |
| static inline bool guest_cpuid_is_amd_or_hygon(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_cpuid_entry2 *best; |
| |
| best = kvm_find_cpuid_entry(vcpu, 0); |
| return best && |
| (is_guest_vendor_amd(best->ebx, best->ecx, best->edx) || |
| is_guest_vendor_hygon(best->ebx, best->ecx, best->edx)); |
| } |
| |
| static inline bool guest_cpuid_is_intel(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_cpuid_entry2 *best; |
| |
| best = kvm_find_cpuid_entry(vcpu, 0); |
| return best && is_guest_vendor_intel(best->ebx, best->ecx, best->edx); |
| } |
| |
| static inline int guest_cpuid_family(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_cpuid_entry2 *best; |
| |
| best = kvm_find_cpuid_entry(vcpu, 0x1); |
| if (!best) |
| return -1; |
| |
| return x86_family(best->eax); |
| } |
| |
| static inline int guest_cpuid_model(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_cpuid_entry2 *best; |
| |
| best = kvm_find_cpuid_entry(vcpu, 0x1); |
| if (!best) |
| return -1; |
| |
| return x86_model(best->eax); |
| } |
| |
| static inline bool cpuid_model_is_consistent(struct kvm_vcpu *vcpu) |
| { |
| return boot_cpu_data.x86_model == guest_cpuid_model(vcpu); |
| } |
| |
| static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_cpuid_entry2 *best; |
| |
| best = kvm_find_cpuid_entry(vcpu, 0x1); |
| if (!best) |
| return -1; |
| |
| return x86_stepping(best->eax); |
| } |
| |
| static inline bool guest_has_spec_ctrl_msr(struct kvm_vcpu *vcpu) |
| { |
| return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) || |
| guest_cpuid_has(vcpu, X86_FEATURE_AMD_STIBP) || |
| guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS) || |
| guest_cpuid_has(vcpu, X86_FEATURE_AMD_SSBD)); |
| } |
| |
| static inline bool guest_has_pred_cmd_msr(struct kvm_vcpu *vcpu) |
| { |
| return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) || |
| guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB)); |
| } |
| |
| static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu) |
| { |
| return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT; |
| } |
| |
| static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu) |
| { |
| return vcpu->arch.msr_misc_features_enables & |
| MSR_MISC_FEATURES_ENABLES_CPUID_FAULT; |
| } |
| |
| static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature) |
| { |
| unsigned int x86_leaf = __feature_leaf(x86_feature); |
| |
| reverse_cpuid_check(x86_leaf); |
| kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature); |
| } |
| |
| static __always_inline void kvm_cpu_cap_set(unsigned int x86_feature) |
| { |
| unsigned int x86_leaf = __feature_leaf(x86_feature); |
| |
| reverse_cpuid_check(x86_leaf); |
| kvm_cpu_caps[x86_leaf] |= __feature_bit(x86_feature); |
| } |
| |
| static __always_inline u32 kvm_cpu_cap_get(unsigned int x86_feature) |
| { |
| unsigned int x86_leaf = __feature_leaf(x86_feature); |
| |
| reverse_cpuid_check(x86_leaf); |
| return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature); |
| } |
| |
| static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature) |
| { |
| return !!kvm_cpu_cap_get(x86_feature); |
| } |
| |
| static __always_inline void kvm_cpu_cap_check_and_set(unsigned int x86_feature) |
| { |
| if (boot_cpu_has(x86_feature)) |
| kvm_cpu_cap_set(x86_feature); |
| } |
| |
| static __always_inline bool guest_pv_has(struct kvm_vcpu *vcpu, |
| unsigned int kvm_feature) |
| { |
| if (!vcpu->arch.pv_cpuid.enforce) |
| return true; |
| |
| return vcpu->arch.pv_cpuid.features & (1u << kvm_feature); |
| } |
| |
| enum kvm_governed_features { |
| #define KVM_GOVERNED_FEATURE(x) KVM_GOVERNED_##x, |
| #include "governed_features.h" |
| KVM_NR_GOVERNED_FEATURES |
| }; |
| |
| static __always_inline int kvm_governed_feature_index(unsigned int x86_feature) |
| { |
| switch (x86_feature) { |
| #define KVM_GOVERNED_FEATURE(x) case x: return KVM_GOVERNED_##x; |
| #include "governed_features.h" |
| default: |
| return -1; |
| } |
| } |
| |
| static __always_inline bool kvm_is_governed_feature(unsigned int x86_feature) |
| { |
| return kvm_governed_feature_index(x86_feature) >= 0; |
| } |
| |
| static __always_inline void kvm_governed_feature_set(struct kvm_vcpu *vcpu, |
| unsigned int x86_feature) |
| { |
| BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature)); |
| |
| __set_bit(kvm_governed_feature_index(x86_feature), |
| vcpu->arch.governed_features.enabled); |
| } |
| |
| static __always_inline void kvm_governed_feature_check_and_set(struct kvm_vcpu *vcpu, |
| unsigned int x86_feature) |
| { |
| if (kvm_cpu_cap_has(x86_feature) && guest_cpuid_has(vcpu, x86_feature)) |
| kvm_governed_feature_set(vcpu, x86_feature); |
| } |
| |
| static __always_inline bool guest_can_use(struct kvm_vcpu *vcpu, |
| unsigned int x86_feature) |
| { |
| BUILD_BUG_ON(!kvm_is_governed_feature(x86_feature)); |
| |
| return test_bit(kvm_governed_feature_index(x86_feature), |
| vcpu->arch.governed_features.enabled); |
| } |
| |
| #endif |
