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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 <asm/cpu.h>
#include <asm/processor.h>
int kvm_update_cpuid(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 check_limit);
int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu);
static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
{
return vcpu->arch.maxphyaddr;
}
struct cpuid_reg {
u32 function;
u32 index;
int reg;
};
static const struct cpuid_reg reverse_cpuid[] = {
[CPUID_1_EDX] = { 1, 0, CPUID_EDX},
[CPUID_8000_0001_EDX] = {0x80000001, 0, CPUID_EDX},
[CPUID_8086_0001_EDX] = {0x80860001, 0, CPUID_EDX},
[CPUID_1_ECX] = { 1, 0, CPUID_ECX},
[CPUID_C000_0001_EDX] = {0xc0000001, 0, CPUID_EDX},
[CPUID_8000_0001_ECX] = {0x80000001, 0, CPUID_ECX},
[CPUID_7_0_EBX] = { 7, 0, CPUID_EBX},
[CPUID_D_1_EAX] = { 0xd, 1, CPUID_EAX},
[CPUID_8000_0008_EBX] = {0x80000008, 0, CPUID_EBX},
[CPUID_6_EAX] = { 6, 0, CPUID_EAX},
[CPUID_8000_000A_EDX] = {0x8000000a, 0, CPUID_EDX},
[CPUID_7_ECX] = { 7, 0, CPUID_ECX},
[CPUID_8000_0007_EBX] = {0x80000007, 0, CPUID_EBX},
[CPUID_7_EDX] = { 7, 0, CPUID_EDX},
[CPUID_7_1_EAX] = { 7, 1, CPUID_EAX},
};
/*
* 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 x86_leaf)
{
BUILD_BUG_ON(x86_leaf == CPUID_LNX_1);
BUILD_BUG_ON(x86_leaf == CPUID_LNX_2);
BUILD_BUG_ON(x86_leaf == CPUID_LNX_3);
BUILD_BUG_ON(x86_leaf == CPUID_LNX_4);
BUILD_BUG_ON(x86_leaf >= ARRAY_SIZE(reverse_cpuid));
BUILD_BUG_ON(reverse_cpuid[x86_leaf].function == 0);
}
/*
* 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)
{
reverse_cpuid_check(x86_feature / 32);
return 1 << (x86_feature & 31);
}
#define feature_bit(name) __feature_bit(X86_FEATURE_##name)
static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned x86_feature)
{
unsigned x86_leaf = x86_feature / 32;
reverse_cpuid_check(x86_leaf);
return reverse_cpuid[x86_leaf];
}
static __always_inline u32 *guest_cpuid_get_register(struct kvm_vcpu *vcpu, unsigned x86_feature)
{
struct kvm_cpuid_entry2 *entry;
const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
entry = kvm_find_cpuid_entry(vcpu, cpuid.function, cpuid.index);
if (!entry)
return NULL;
switch (cpuid.reg) {
case CPUID_EAX:
return &entry->eax;
case CPUID_EBX:
return &entry->ebx;
case CPUID_ECX:
return &entry->ecx;
case CPUID_EDX:
return &entry->edx;
default:
BUILD_BUG();
return NULL;
}
}
static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu, unsigned 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 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(struct kvm_vcpu *vcpu)
{
struct kvm_cpuid_entry2 *best;
best = kvm_find_cpuid_entry(vcpu, 0, 0);
return best && best->ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx;
}
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 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;
}
#endif
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