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277ad7d586
Add a second CPUID helper, kvm_find_cpuid_entry_index(), to handle KVM queries for CPUID leaves whose index _may_ be significant, and drop the index param from the existing kvm_find_cpuid_entry(). Add a WARN in the inner helper, cpuid_entry2_find(), to detect attempts to retrieve a CPUID entry whose index is significant without explicitly providing an index. Using an explicit magic number and letting callers omit the index avoids confusion by eliminating the myriad cases where KVM specifies '0' as a dummy value. Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
236 lines
6.1 KiB
C
236 lines
6.1 KiB
C
/* 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 "reverse_cpuid.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[NR_KVM_CPU_CAPS] __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_index(struct kvm_vcpu *vcpu,
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u32 function, u32 index);
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struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
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u32 function);
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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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u32 xstate_required_size(u64 xstate_bv, bool compacted);
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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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static __always_inline void cpuid_entry_override(struct kvm_cpuid_entry2 *entry,
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unsigned int 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_index(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);
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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 bool guest_cpuid_is_intel(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);
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return best && is_guest_vendor_intel(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);
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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);
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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 bool cpuid_model_is_consistent(struct kvm_vcpu *vcpu)
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{
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return boot_cpu_data.x86_model == guest_cpuid_model(vcpu);
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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);
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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 = __feature_leaf(x86_feature);
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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 = __feature_leaf(x86_feature);
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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 = __feature_leaf(x86_feature);
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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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