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353 lines
9.7 KiB
353 lines
9.7 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef ARCH_X86_KVM_CPUID_H |
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#define ARCH_X86_KVM_CPUID_H |
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#include "x86.h" |
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#include <asm/cpu.h> |
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#include <asm/processor.h> |
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#include <uapi/asm/kvm_para.h> |
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extern u32 kvm_cpu_caps[NCAPINTS] __read_mostly; |
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void kvm_set_cpu_caps(void); |
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void kvm_update_cpuid_runtime(struct kvm_vcpu *vcpu); |
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void kvm_update_pv_runtime(struct kvm_vcpu *vcpu); |
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struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu, |
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u32 function, u32 index); |
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int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid, |
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struct kvm_cpuid_entry2 __user *entries, |
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unsigned int type); |
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int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu, |
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struct kvm_cpuid *cpuid, |
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struct kvm_cpuid_entry __user *entries); |
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int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu, |
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struct kvm_cpuid2 *cpuid, |
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struct kvm_cpuid_entry2 __user *entries); |
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int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu, |
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struct kvm_cpuid2 *cpuid, |
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struct kvm_cpuid_entry2 __user *entries); |
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bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx, |
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u32 *ecx, u32 *edx, bool exact_only); |
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int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu); |
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u64 kvm_vcpu_reserved_gpa_bits_raw(struct kvm_vcpu *vcpu); |
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static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu) |
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{ |
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return vcpu->arch.maxphyaddr; |
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} |
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static inline bool kvm_vcpu_is_legal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa) |
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{ |
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return !(gpa & vcpu->arch.reserved_gpa_bits); |
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} |
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static inline bool kvm_vcpu_is_illegal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa) |
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{ |
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return !kvm_vcpu_is_legal_gpa(vcpu, gpa); |
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} |
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static inline bool kvm_vcpu_is_legal_aligned_gpa(struct kvm_vcpu *vcpu, |
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gpa_t gpa, gpa_t alignment) |
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{ |
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return IS_ALIGNED(gpa, alignment) && kvm_vcpu_is_legal_gpa(vcpu, gpa); |
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} |
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static inline bool page_address_valid(struct kvm_vcpu *vcpu, gpa_t gpa) |
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{ |
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return kvm_vcpu_is_legal_aligned_gpa(vcpu, gpa, PAGE_SIZE); |
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} |
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struct cpuid_reg { |
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u32 function; |
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u32 index; |
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int reg; |
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}; |
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static const struct cpuid_reg reverse_cpuid[] = { |
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[CPUID_1_EDX] = { 1, 0, CPUID_EDX}, |
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[CPUID_8000_0001_EDX] = {0x80000001, 0, CPUID_EDX}, |
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[CPUID_8086_0001_EDX] = {0x80860001, 0, CPUID_EDX}, |
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[CPUID_1_ECX] = { 1, 0, CPUID_ECX}, |
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[CPUID_C000_0001_EDX] = {0xc0000001, 0, CPUID_EDX}, |
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[CPUID_8000_0001_ECX] = {0x80000001, 0, CPUID_ECX}, |
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[CPUID_7_0_EBX] = { 7, 0, CPUID_EBX}, |
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[CPUID_D_1_EAX] = { 0xd, 1, CPUID_EAX}, |
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[CPUID_8000_0008_EBX] = {0x80000008, 0, CPUID_EBX}, |
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[CPUID_6_EAX] = { 6, 0, CPUID_EAX}, |
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[CPUID_8000_000A_EDX] = {0x8000000a, 0, CPUID_EDX}, |
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[CPUID_7_ECX] = { 7, 0, CPUID_ECX}, |
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[CPUID_8000_0007_EBX] = {0x80000007, 0, CPUID_EBX}, |
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[CPUID_7_EDX] = { 7, 0, CPUID_EDX}, |
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[CPUID_7_1_EAX] = { 7, 1, CPUID_EAX}, |
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}; |
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/* |
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* Reverse CPUID and its derivatives can only be used for hardware-defined |
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* feature words, i.e. words whose bits directly correspond to a CPUID leaf. |
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* Retrieving a feature bit or masking guest CPUID from a Linux-defined word |
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* is nonsensical as the bit number/mask is an arbitrary software-defined value |
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* and can't be used by KVM to query/control guest capabilities. And obviously |
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* the leaf being queried must have an entry in the lookup table. |
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*/ |
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static __always_inline void reverse_cpuid_check(unsigned int x86_leaf) |
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{ |
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BUILD_BUG_ON(x86_leaf == CPUID_LNX_1); |
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BUILD_BUG_ON(x86_leaf == CPUID_LNX_2); |
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BUILD_BUG_ON(x86_leaf == CPUID_LNX_3); |
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BUILD_BUG_ON(x86_leaf == CPUID_LNX_4); |
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BUILD_BUG_ON(x86_leaf >= ARRAY_SIZE(reverse_cpuid)); |
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BUILD_BUG_ON(reverse_cpuid[x86_leaf].function == 0); |
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} |
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/* |
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* Retrieve the bit mask from an X86_FEATURE_* definition. Features contain |
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* the hardware defined bit number (stored in bits 4:0) and a software defined |
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* "word" (stored in bits 31:5). The word is used to index into arrays of |
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* bit masks that hold the per-cpu feature capabilities, e.g. this_cpu_has(). |
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*/ |
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static __always_inline u32 __feature_bit(int x86_feature) |
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{ |
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reverse_cpuid_check(x86_feature / 32); |
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return 1 << (x86_feature & 31); |
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} |
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#define feature_bit(name) __feature_bit(X86_FEATURE_##name) |
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static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned int x86_feature) |
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{ |
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unsigned int x86_leaf = x86_feature / 32; |
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reverse_cpuid_check(x86_leaf); |
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return reverse_cpuid[x86_leaf]; |
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} |
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static __always_inline u32 *__cpuid_entry_get_reg(struct kvm_cpuid_entry2 *entry, |
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u32 reg) |
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{ |
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switch (reg) { |
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case CPUID_EAX: |
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return &entry->eax; |
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case CPUID_EBX: |
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return &entry->ebx; |
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case CPUID_ECX: |
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return &entry->ecx; |
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case CPUID_EDX: |
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return &entry->edx; |
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default: |
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BUILD_BUG(); |
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return NULL; |
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} |
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} |
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static __always_inline u32 *cpuid_entry_get_reg(struct kvm_cpuid_entry2 *entry, |
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unsigned int x86_feature) |
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{ |
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const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature); |
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return __cpuid_entry_get_reg(entry, cpuid.reg); |
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} |
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static __always_inline u32 cpuid_entry_get(struct kvm_cpuid_entry2 *entry, |
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unsigned int x86_feature) |
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{ |
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u32 *reg = cpuid_entry_get_reg(entry, x86_feature); |
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return *reg & __feature_bit(x86_feature); |
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} |
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static __always_inline bool cpuid_entry_has(struct kvm_cpuid_entry2 *entry, |
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unsigned int x86_feature) |
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{ |
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return cpuid_entry_get(entry, x86_feature); |
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} |
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static __always_inline void cpuid_entry_clear(struct kvm_cpuid_entry2 *entry, |
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unsigned int x86_feature) |
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{ |
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u32 *reg = cpuid_entry_get_reg(entry, x86_feature); |
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*reg &= ~__feature_bit(x86_feature); |
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} |
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static __always_inline void cpuid_entry_set(struct kvm_cpuid_entry2 *entry, |
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unsigned int x86_feature) |
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{ |
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u32 *reg = cpuid_entry_get_reg(entry, x86_feature); |
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*reg |= __feature_bit(x86_feature); |
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} |
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static __always_inline void cpuid_entry_change(struct kvm_cpuid_entry2 *entry, |
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unsigned int x86_feature, |
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bool set) |
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{ |
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u32 *reg = cpuid_entry_get_reg(entry, x86_feature); |
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/* |
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* Open coded instead of using cpuid_entry_{clear,set}() to coerce the |
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* compiler into using CMOV instead of Jcc when possible. |
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*/ |
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if (set) |
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*reg |= __feature_bit(x86_feature); |
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else |
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*reg &= ~__feature_bit(x86_feature); |
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} |
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static __always_inline void cpuid_entry_override(struct kvm_cpuid_entry2 *entry, |
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enum cpuid_leafs leaf) |
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{ |
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u32 *reg = cpuid_entry_get_reg(entry, leaf * 32); |
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BUILD_BUG_ON(leaf >= ARRAY_SIZE(kvm_cpu_caps)); |
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*reg = kvm_cpu_caps[leaf]; |
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} |
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static __always_inline u32 *guest_cpuid_get_register(struct kvm_vcpu *vcpu, |
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unsigned int x86_feature) |
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{ |
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const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature); |
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struct kvm_cpuid_entry2 *entry; |
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entry = kvm_find_cpuid_entry(vcpu, cpuid.function, cpuid.index); |
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if (!entry) |
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return NULL; |
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return __cpuid_entry_get_reg(entry, cpuid.reg); |
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} |
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static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu, |
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unsigned int x86_feature) |
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{ |
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u32 *reg; |
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reg = guest_cpuid_get_register(vcpu, x86_feature); |
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if (!reg) |
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return false; |
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return *reg & __feature_bit(x86_feature); |
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} |
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static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu, |
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unsigned int x86_feature) |
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{ |
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u32 *reg; |
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reg = guest_cpuid_get_register(vcpu, x86_feature); |
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if (reg) |
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*reg &= ~__feature_bit(x86_feature); |
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} |
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static inline bool guest_cpuid_is_amd_or_hygon(struct kvm_vcpu *vcpu) |
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{ |
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struct kvm_cpuid_entry2 *best; |
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best = kvm_find_cpuid_entry(vcpu, 0, 0); |
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return best && |
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(is_guest_vendor_amd(best->ebx, best->ecx, best->edx) || |
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is_guest_vendor_hygon(best->ebx, best->ecx, best->edx)); |
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} |
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static inline int guest_cpuid_family(struct kvm_vcpu *vcpu) |
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{ |
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struct kvm_cpuid_entry2 *best; |
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best = kvm_find_cpuid_entry(vcpu, 0x1, 0); |
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if (!best) |
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return -1; |
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return x86_family(best->eax); |
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} |
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static inline int guest_cpuid_model(struct kvm_vcpu *vcpu) |
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{ |
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struct kvm_cpuid_entry2 *best; |
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best = kvm_find_cpuid_entry(vcpu, 0x1, 0); |
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if (!best) |
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return -1; |
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return x86_model(best->eax); |
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} |
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static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu) |
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{ |
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struct kvm_cpuid_entry2 *best; |
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best = kvm_find_cpuid_entry(vcpu, 0x1, 0); |
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if (!best) |
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return -1; |
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return x86_stepping(best->eax); |
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} |
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static inline bool guest_has_spec_ctrl_msr(struct kvm_vcpu *vcpu) |
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{ |
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return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) || |
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guest_cpuid_has(vcpu, X86_FEATURE_AMD_STIBP) || |
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guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS) || |
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guest_cpuid_has(vcpu, X86_FEATURE_AMD_SSBD)); |
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} |
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static inline bool guest_has_pred_cmd_msr(struct kvm_vcpu *vcpu) |
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{ |
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return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) || |
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guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB)); |
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} |
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static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu) |
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{ |
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return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT; |
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} |
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static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu) |
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{ |
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return vcpu->arch.msr_misc_features_enables & |
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MSR_MISC_FEATURES_ENABLES_CPUID_FAULT; |
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} |
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static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature) |
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{ |
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unsigned int x86_leaf = x86_feature / 32; |
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reverse_cpuid_check(x86_leaf); |
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kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature); |
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} |
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static __always_inline void kvm_cpu_cap_set(unsigned int x86_feature) |
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{ |
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unsigned int x86_leaf = x86_feature / 32; |
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reverse_cpuid_check(x86_leaf); |
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kvm_cpu_caps[x86_leaf] |= __feature_bit(x86_feature); |
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} |
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static __always_inline u32 kvm_cpu_cap_get(unsigned int x86_feature) |
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{ |
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unsigned int x86_leaf = x86_feature / 32; |
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reverse_cpuid_check(x86_leaf); |
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return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature); |
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} |
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static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature) |
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{ |
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return !!kvm_cpu_cap_get(x86_feature); |
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} |
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static __always_inline void kvm_cpu_cap_check_and_set(unsigned int x86_feature) |
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{ |
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if (boot_cpu_has(x86_feature)) |
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kvm_cpu_cap_set(x86_feature); |
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} |
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static __always_inline bool guest_pv_has(struct kvm_vcpu *vcpu, |
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unsigned int kvm_feature) |
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{ |
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if (!vcpu->arch.pv_cpuid.enforce) |
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return true; |
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return vcpu->arch.pv_cpuid.features & (1u << kvm_feature); |
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} |
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#endif
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