[linux-block.git] / arch / x86 / kvm / cpuid.h

/* 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);
bool kvm_mpx_supported(void);
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] = {0xc0000001, 0, CPUID_ECX},
	[CPUID_7_0_EBX]       = {         7, 0, CPUID_EBX},
	[CPUID_D_1_EAX]       = {       0xd, 1, CPUID_EAX},
	[CPUID_F_0_EDX]       = {       0xf, 0, CPUID_EDX},
	[CPUID_F_1_EDX]       = {       0xf, 1, CPUID_EDX},
	[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},
};

static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned x86_feature)
{
	unsigned x86_leaf = x86_feature / 32;

	BUILD_BUG_ON(x86_leaf >= ARRAY_SIZE(reverse_cpuid));
	BUILD_BUG_ON(reverse_cpuid[x86_leaf].function == 0);

	return reverse_cpuid[x86_leaf];
}

static __always_inline int *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)
{
	int *reg;

	if (x86_feature == X86_FEATURE_XSAVE &&
			!static_cpu_has(X86_FEATURE_XSAVE))
		return false;

	reg = guest_cpuid_get_register(vcpu, x86_feature);
	if (!reg)
		return false;

	return *reg & bit(x86_feature);
}

static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu, unsigned x86_feature)
{
	int *reg;

	reg = guest_cpuid_get_register(vcpu, x86_feature);
	if (reg)
		*reg &= ~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
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
00b27a3e AK	2	#ifndef ARCH_X86_KVM_CPUID_H
	3	#define ARCH_X86_KVM_CPUID_H
	4
	5	#include "x86.h"
91713faf	6	#include <asm/cpu.h>
d6321d49	7	#include <asm/processor.h>
00b27a3e	8
dd598091	9	int kvm_update_cpuid(struct kvm_vcpu *vcpu);
a87036ad	10	bool kvm_mpx_supported(void);
00b27a3e AK	11	struct kvm_cpuid_entry2 kvm_find_cpuid_entry(struct kvm_vcpu vcpu,
00b27a3e AK	12	u32 function, u32 index);
9c15bb1d BP	13	int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
	14	struct kvm_cpuid_entry2 __user *entries,
	15	unsigned int type);
00b27a3e AK	16	int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
	17	struct kvm_cpuid *cpuid,
	18	struct kvm_cpuid_entry __user *entries);
	19	int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
	20	struct kvm_cpuid2 *cpuid,
	21	struct kvm_cpuid_entry2 __user *entries);
	22	int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
	23	struct kvm_cpuid2 *cpuid,
	24	struct kvm_cpuid_entry2 __user *entries);
e911eb3b YZ	25	bool kvm_cpuid(struct kvm_vcpu vcpu, u32 eax, u32 *ebx,
e911eb3b YZ	26	u32 ecx, u32 edx, bool check_limit);
00b27a3e	27
5a4f55cd EK	28	int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu);
	29
	30	static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
	31	{
	32	return vcpu->arch.maxphyaddr;
	33	}
00b27a3e	34
d6321d49 RK	35	struct cpuid_reg {
	36	u32 function;
	37	u32 index;
	38	int reg;
	39	};
00b27a3e	40
d6321d49 RK	41	static const struct cpuid_reg reverse_cpuid[] = {
	42	[CPUID_1_EDX] = { 1, 0, CPUID_EDX},
	43	[CPUID_8000_0001_EDX] = {0x80000001, 0, CPUID_EDX},
	44	[CPUID_8086_0001_EDX] = {0x80860001, 0, CPUID_EDX},
	45	[CPUID_1_ECX] = { 1, 0, CPUID_ECX},
	46	[CPUID_C000_0001_EDX] = {0xc0000001, 0, CPUID_EDX},
	47	[CPUID_8000_0001_ECX] = {0xc0000001, 0, CPUID_ECX},
	48	[CPUID_7_0_EBX] = { 7, 0, CPUID_EBX},
	49	[CPUID_D_1_EAX] = { 0xd, 1, CPUID_EAX},
	50	[CPUID_F_0_EDX] = { 0xf, 0, CPUID_EDX},
	51	[CPUID_F_1_EDX] = { 0xf, 1, CPUID_EDX},
	52	[CPUID_8000_0008_EBX] = {0x80000008, 0, CPUID_EBX},
	53	[CPUID_6_EAX] = { 6, 0, CPUID_EAX},
	54	[CPUID_8000_000A_EDX] = {0x8000000a, 0, CPUID_EDX},
	55	[CPUID_7_ECX] = { 7, 0, CPUID_ECX},
	56	[CPUID_8000_0007_EBX] = {0x80000007, 0, CPUID_EBX},
	57	};
00b27a3e	58
d6321d49	59	static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned x86_feature)
e24dea2a	60	{
d6321d49	61	unsigned x86_leaf = x86_feature / 32;
e24dea2a	62
d6321d49 RK	63	BUILD_BUG_ON(x86_leaf >= ARRAY_SIZE(reverse_cpuid));
d6321d49 RK	64	BUILD_BUG_ON(reverse_cpuid[x86_leaf].function == 0);
e24dea2a	65
d6321d49	66	return reverse_cpuid[x86_leaf];
00b27a3e AK	67	}
00b27a3e AK	68
d6321d49	69	static __always_inline int guest_cpuid_get_register(struct kvm_vcpu vcpu, unsigned x86_feature)
97ec8c06	70	{
d6321d49 RK	71	struct kvm_cpuid_entry2 *entry;
d6321d49 RK	72	const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
660a5d51	73
d6321d49 RK	74	entry = kvm_find_cpuid_entry(vcpu, cpuid.function, cpuid.index);
	75	if (!entry)
	76	return NULL;
2b036c6b	77
d6321d49 RK	78	switch (cpuid.reg) {
	79	case CPUID_EAX:
	80	return &entry->eax;
	81	case CPUID_EBX:
	82	return &entry->ebx;
	83	case CPUID_ECX:
	84	return &entry->ecx;
	85	case CPUID_EDX:
	86	return &entry->edx;
	87	default:
	88	BUILD_BUG();
	89	return NULL;
	90	}
2b036c6b BO	91	}
2b036c6b BO	92
d6321d49	93	static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu, unsigned x86_feature)
ad756a16	94	{
d6321d49	95	int *reg;
ad756a16	96
d6321d49 RK	97	if (x86_feature == X86_FEATURE_XSAVE &&
	98	!static_cpu_has(X86_FEATURE_XSAVE))
	99	return false;
ad756a16	100
d6321d49 RK	101	reg = guest_cpuid_get_register(vcpu, x86_feature);
	102	if (!reg)
	103	return false;
58cb628d	104
d6321d49	105	return *reg & bit(x86_feature);
58cb628d JK	106	}
58cb628d JK	107
1b4d56b8 RK	108	static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu, unsigned x86_feature)
	109	{
	110	int *reg;
	111
	112	reg = guest_cpuid_get_register(vcpu, x86_feature);
	113	if (reg)
	114	*reg &= ~bit(x86_feature);
	115	}
	116
a0c0feb5 PB	117	static inline bool guest_cpuid_is_amd(struct kvm_vcpu *vcpu)
	118	{
	119	struct kvm_cpuid_entry2 *best;
	120
	121	best = kvm_find_cpuid_entry(vcpu, 0, 0);
	122	return best && best->ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx;
	123	}
	124
91713faf BP	125	static inline int guest_cpuid_family(struct kvm_vcpu *vcpu)
	126	{
	127	struct kvm_cpuid_entry2 *best;
	128
	129	best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
	130	if (!best)
	131	return -1;
	132
	133	return x86_family(best->eax);
	134	}
	135
	136	static inline int guest_cpuid_model(struct kvm_vcpu *vcpu)
	137	{
	138	struct kvm_cpuid_entry2 *best;
	139
	140	best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
	141	if (!best)
	142	return -1;
	143
	144	return x86_model(best->eax);
	145	}
	146
	147	static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
	148	{
	149	struct kvm_cpuid_entry2 *best;
	150
	151	best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
	152	if (!best)
	153	return -1;
	154
	155	return x86_stepping(best->eax);
	156	}
	157
db2336a8 KH	158	static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu)
	159	{
	160	return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT;
	161	}
	162
	163	static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu)
	164	{
	165	return vcpu->arch.msr_misc_features_enables &
	166	MSR_MISC_FEATURES_ENABLES_CPUID_FAULT;
	167	}
	168
00b27a3e	169	#endif