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linux-stable/arch/x86/kvm/cpuid.h
Ricardo Koller 013380782d KVM: x86: Move reverse CPUID helpers to separate header file 
Split out the reverse CPUID machinery to a dedicated header file
so that KVM selftests can reuse the reverse CPUID definitions without
introducing any '#ifdef __KERNEL__' pollution.

Co-developed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Ricardo Koller <ricarkol@google.com>
Message-Id: <20210422005626.564163-2-ricarkol@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-04-26 05:27:13 -04:00

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/* 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(struct kvm_vcpu *vcpu,
u32 function, u32 index);
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);
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(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, 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, 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, 0);
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, 0);
if (!best)
return -1;
return x86_model(best->eax);
}
static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
{
struct kvm_cpuid_entry2 *best;
best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
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);
}
#endif
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