/* SPDX-License-Identifier: GPL-2.0 */ #ifndef ARCH_X86_KVM_REVERSE_CPUID_H #define ARCH_X86_KVM_REVERSE_CPUID_H #include <uapi/asm/kvm.h> #include <asm/cpufeature.h> #include <asm/cpufeatures.h> /* * Hardware-defined CPUID leafs that are either scattered by the kernel or are * unknown to the kernel, but need to be directly used by KVM. Note, these * word values conflict with the kernel's "bug" caps, but KVM doesn't use those. */ enum kvm_only_cpuid_leafs { … }; /* * Define a KVM-only feature flag. * * For features that are scattered by cpufeatures.h, __feature_translate() also * needs to be updated to translate the kernel-defined feature into the * KVM-defined feature. * * For features that are 100% KVM-only, i.e. not defined by cpufeatures.h, * forego the intermediate KVM_X86_FEATURE and directly define X86_FEATURE_* so * that X86_FEATURE_* can be used in KVM. No __feature_translate() handling is * needed in this case. */ #define KVM_X86_FEATURE(w, f) … /* Intel-defined SGX sub-features, CPUID level 0x12 (EAX). */ #define KVM_X86_FEATURE_SGX1 … #define KVM_X86_FEATURE_SGX2 … #define KVM_X86_FEATURE_SGX_EDECCSSA … /* Intel-defined sub-features, CPUID level 0x00000007:1 (EDX) */ #define X86_FEATURE_AVX_VNNI_INT8 … #define X86_FEATURE_AVX_NE_CONVERT … #define X86_FEATURE_AMX_COMPLEX … #define X86_FEATURE_PREFETCHITI … #define X86_FEATURE_AVX10 … /* Intel-defined sub-features, CPUID level 0x00000007:2 (EDX) */ #define X86_FEATURE_INTEL_PSFD … #define X86_FEATURE_IPRED_CTRL … #define KVM_X86_FEATURE_RRSBA_CTRL … #define X86_FEATURE_DDPD_U … #define KVM_X86_FEATURE_BHI_CTRL … #define X86_FEATURE_MCDT_NO … /* Intel-defined sub-features, CPUID level 0x00000024:0 (EBX) */ #define X86_FEATURE_AVX10_128 … #define X86_FEATURE_AVX10_256 … #define X86_FEATURE_AVX10_512 … /* CPUID level 0x80000007 (EDX). */ #define KVM_X86_FEATURE_CONSTANT_TSC … /* CPUID level 0x80000022 (EAX) */ #define KVM_X86_FEATURE_PERFMON_V2 … struct cpuid_reg { … }; static const struct cpuid_reg reverse_cpuid[] = …; /* * Reverse CPUID and its derivatives can only be used for hardware-defined * feature words, i.e. words whose bits directly correspond to a CPUID leaf. * Retrieving a feature bit or masking guest CPUID from a Linux-defined word * is nonsensical as the bit number/mask is an arbitrary software-defined value * and can't be used by KVM to query/control guest capabilities. And obviously * the leaf being queried must have an entry in the lookup table. */ static __always_inline void reverse_cpuid_check(unsigned int x86_leaf) { … } /* * Translate feature bits that are scattered in the kernel's cpufeatures word * into KVM feature words that align with hardware's definitions. */ static __always_inline u32 __feature_translate(int x86_feature) { … } static __always_inline u32 __feature_leaf(int x86_feature) { … } /* * Retrieve the bit mask from an X86_FEATURE_* definition. Features contain * the hardware defined bit number (stored in bits 4:0) and a software defined * "word" (stored in bits 31:5). The word is used to index into arrays of * bit masks that hold the per-cpu feature capabilities, e.g. this_cpu_has(). */ static __always_inline u32 __feature_bit(int x86_feature) { … } #define feature_bit(name) … static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned int x86_feature) { … } static __always_inline u32 *__cpuid_entry_get_reg(struct kvm_cpuid_entry2 *entry, u32 reg) { … } static __always_inline u32 *cpuid_entry_get_reg(struct kvm_cpuid_entry2 *entry, unsigned int x86_feature) { … } static __always_inline u32 cpuid_entry_get(struct kvm_cpuid_entry2 *entry, unsigned int x86_feature) { … } static __always_inline bool cpuid_entry_has(struct kvm_cpuid_entry2 *entry, unsigned int x86_feature) { … } static __always_inline void cpuid_entry_clear(struct kvm_cpuid_entry2 *entry, unsigned int x86_feature) { … } static __always_inline void cpuid_entry_set(struct kvm_cpuid_entry2 *entry, unsigned int x86_feature) { … } static __always_inline void cpuid_entry_change(struct kvm_cpuid_entry2 *entry, unsigned int x86_feature, bool set) { … } #endif /* ARCH_X86_KVM_REVERSE_CPUID_H */
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