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

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __KVM_X86_VMX_HYPERV_H
#define __KVM_X86_VMX_HYPERV_H

#include <linux/jump_label.h>

#include <asm/hyperv-tlfs.h>
#include <asm/mshyperv.h>
#include <asm/vmx.h>

#include "../hyperv.h"

#include "capabilities.h"
#include "vmcs.h"
#include "vmcs12.h"

struct vmcs_config;

#define current_evmcs ((struct hv_enlightened_vmcs *)this_cpu_read(current_vmcs))

#define KVM_EVMCS_VERSION 1

struct evmcs_field {
	u16 offset;
	u16 clean_field;
};

extern const struct evmcs_field vmcs_field_to_evmcs_1[];
extern const unsigned int nr_evmcs_1_fields;

static __always_inline int evmcs_field_offset(unsigned long field,
					      u16 *clean_field)
{
	unsigned int index = ROL16(field, 6);
	const struct evmcs_field *evmcs_field;

	if (unlikely(index >= nr_evmcs_1_fields))
		return -ENOENT;

	evmcs_field = &vmcs_field_to_evmcs_1[index];

	/*
	 * Use offset=0 to detect holes in eVMCS. This offset belongs to
	 * 'revision_id' but this field has no encoding and is supposed to
	 * be accessed directly.
	 */
	if (unlikely(!evmcs_field->offset))
		return -ENOENT;

	if (clean_field)
		*clean_field = evmcs_field->clean_field;

	return evmcs_field->offset;
}

static inline u64 evmcs_read_any(struct hv_enlightened_vmcs *evmcs,
				 unsigned long field, u16 offset)
{
	/*
	 * vmcs12_read_any() doesn't care whether the supplied structure
	 * is 'struct vmcs12' or 'struct hv_enlightened_vmcs' as it takes
	 * the exact offset of the required field, use it for convenience
	 * here.
	 */
	return vmcs12_read_any((void *)evmcs, field, offset);
}

#if IS_ENABLED(CONFIG_HYPERV)

DECLARE_STATIC_KEY_FALSE(__kvm_is_using_evmcs);

static __always_inline bool kvm_is_using_evmcs(void)
{
	return static_branch_unlikely(&__kvm_is_using_evmcs);
}

static __always_inline int get_evmcs_offset(unsigned long field,
					    u16 *clean_field)
{
	int offset = evmcs_field_offset(field, clean_field);

	WARN_ONCE(offset < 0, "accessing unsupported EVMCS field %lx\n", field);
	return offset;
}

static __always_inline void evmcs_write64(unsigned long field, u64 value)
{
	u16 clean_field;
	int offset = get_evmcs_offset(field, &clean_field);

	if (offset < 0)
		return;

	*(u64 *)((char *)current_evmcs + offset) = value;

	current_evmcs->hv_clean_fields &= ~clean_field;
}

static __always_inline void evmcs_write32(unsigned long field, u32 value)
{
	u16 clean_field;
	int offset = get_evmcs_offset(field, &clean_field);

	if (offset < 0)
		return;

	*(u32 *)((char *)current_evmcs + offset) = value;
	current_evmcs->hv_clean_fields &= ~clean_field;
}

static __always_inline void evmcs_write16(unsigned long field, u16 value)
{
	u16 clean_field;
	int offset = get_evmcs_offset(field, &clean_field);

	if (offset < 0)
		return;

	*(u16 *)((char *)current_evmcs + offset) = value;
	current_evmcs->hv_clean_fields &= ~clean_field;
}

static __always_inline u64 evmcs_read64(unsigned long field)
{
	int offset = get_evmcs_offset(field, NULL);

	if (offset < 0)
		return 0;

	return *(u64 *)((char *)current_evmcs + offset);
}

static __always_inline u32 evmcs_read32(unsigned long field)
{
	int offset = get_evmcs_offset(field, NULL);

	if (offset < 0)
		return 0;

	return *(u32 *)((char *)current_evmcs + offset);
}

static __always_inline u16 evmcs_read16(unsigned long field)
{
	int offset = get_evmcs_offset(field, NULL);

	if (offset < 0)
		return 0;

	return *(u16 *)((char *)current_evmcs + offset);
}

static inline void evmcs_load(u64 phys_addr)
{
	struct hv_vp_assist_page *vp_ap =
		hv_get_vp_assist_page(smp_processor_id());

	if (current_evmcs->hv_enlightenments_control.nested_flush_hypercall)
		vp_ap->nested_control.features.directhypercall = 1;
	vp_ap->current_nested_vmcs = phys_addr;
	vp_ap->enlighten_vmentry = 1;
}

void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf);
#else /* !IS_ENABLED(CONFIG_HYPERV) */
static __always_inline bool kvm_is_using_evmcs(void) { return false; }
static __always_inline void evmcs_write64(unsigned long field, u64 value) {}
static __always_inline void evmcs_write32(unsigned long field, u32 value) {}
static __always_inline void evmcs_write16(unsigned long field, u16 value) {}
static __always_inline u64 evmcs_read64(unsigned long field) { return 0; }
static __always_inline u32 evmcs_read32(unsigned long field) { return 0; }
static __always_inline u16 evmcs_read16(unsigned long field) { return 0; }
static inline void evmcs_load(u64 phys_addr) {}
#endif /* IS_ENABLED(CONFIG_HYPERV) */

#define EVMPTR_INVALID (-1ULL)
#define EVMPTR_MAP_PENDING (-2ULL)

static inline bool evmptr_is_valid(u64 evmptr)
{
	return evmptr != EVMPTR_INVALID && evmptr != EVMPTR_MAP_PENDING;
}

enum nested_evmptrld_status {
	EVMPTRLD_DISABLED,
	EVMPTRLD_SUCCEEDED,
	EVMPTRLD_VMFAIL,
	EVMPTRLD_ERROR,
};

u64 nested_get_evmptr(struct kvm_vcpu *vcpu);
uint16_t nested_get_evmcs_version(struct kvm_vcpu *vcpu);
int nested_enable_evmcs(struct kvm_vcpu *vcpu,
			uint16_t *vmcs_version);
void nested_evmcs_filter_control_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
int nested_evmcs_check_controls(struct vmcs12 *vmcs12);
bool nested_evmcs_l2_tlb_flush_enabled(struct kvm_vcpu *vcpu);
void vmx_hv_inject_synthetic_vmexit_post_tlb_flush(struct kvm_vcpu *vcpu);

#endif /* __KVM_X86_VMX_HYPERV_H */
Commit	Line	Data
773e8a04	1	/* SPDX-License-Identifier: GPL-2.0 */
a789aeba VK	2	#ifndef __KVM_X86_VMX_HYPERV_H
a789aeba VK	3	#define __KVM_X86_VMX_HYPERV_H
773e8a04	4
75edce8a	5	#include <linux/jump_label.h>
773e8a04	6
75edce8a SC	7	#include <asm/hyperv-tlfs.h>
	8	#include <asm/mshyperv.h>
	9	#include <asm/vmx.h>
	10
a789aeba VK	11	#include "../hyperv.h"
a789aeba VK	12
75edce8a SC	13	#include "capabilities.h"
75edce8a SC	14	#include "vmcs.h"
a8350231	15	#include "vmcs12.h"
75edce8a SC	16
	17	struct vmcs_config;
	18
75edce8a SC	19	#define current_evmcs ((struct hv_enlightened_vmcs *)this_cpu_read(current_vmcs))
	20
	21	#define KVM_EVMCS_VERSION 1
	22
773e8a04 VK	23	struct evmcs_field {
	24	u16 offset;
	25	u16 clean_field;
	26	};
	27
75edce8a SC	28	extern const struct evmcs_field vmcs_field_to_evmcs_1[];
	29	extern const unsigned int nr_evmcs_1_fields;
	30
892a42c1 VK	31	static __always_inline int evmcs_field_offset(unsigned long field,
892a42c1 VK	32	u16 *clean_field)
773e8a04 VK	33	{
	34	unsigned int index = ROL16(field, 6);
	35	const struct evmcs_field *evmcs_field;
	36
892a42c1	37	if (unlikely(index >= nr_evmcs_1_fields))
773e8a04	38	return -ENOENT;
773e8a04 VK	39
	40	evmcs_field = &vmcs_field_to_evmcs_1[index];
	41
892a42c1 VK	42	/*
	43	* Use offset=0 to detect holes in eVMCS. This offset belongs to
	44	* 'revision_id' but this field has no encoding and is supposed to
	45	* be accessed directly.
	46	*/
	47	if (unlikely(!evmcs_field->offset))
	48	return -ENOENT;
	49
773e8a04 VK	50	if (clean_field)
	51	*clean_field = evmcs_field->clean_field;
	52
	53	return evmcs_field->offset;
	54	}
	55
6cbbaab6 VK	56	static inline u64 evmcs_read_any(struct hv_enlightened_vmcs *evmcs,
	57	unsigned long field, u16 offset)
	58	{
	59	/*
	60	* vmcs12_read_any() doesn't care whether the supplied structure
	61	* is 'struct vmcs12' or 'struct hv_enlightened_vmcs' as it takes
	62	* the exact offset of the required field, use it for convenience
	63	* here.
	64	*/
	65	return vmcs12_read_any((void *)evmcs, field, offset);
	66	}
	67
892a42c1 VK	68	#if IS_ENABLED(CONFIG_HYPERV)
892a42c1 VK	69
fbc722aa	70	DECLARE_STATIC_KEY_FALSE(__kvm_is_using_evmcs);
19f10315 SC	71
	72	static __always_inline bool kvm_is_using_evmcs(void)
	73	{
fbc722aa	74	return static_branch_unlikely(&__kvm_is_using_evmcs);
19f10315 SC	75	}
19f10315 SC	76
892a42c1 VK	77	static __always_inline int get_evmcs_offset(unsigned long field,
	78	u16 *clean_field)
	79	{
	80	int offset = evmcs_field_offset(field, clean_field);
	81
8d20bd63	82	WARN_ONCE(offset < 0, "accessing unsupported EVMCS field %lx\n", field);
892a42c1 VK	83	return offset;
	84	}
	85
010050a8	86	static __always_inline void evmcs_write64(unsigned long field, u64 value)
75edce8a SC	87	{
	88	u16 clean_field;
	89	int offset = get_evmcs_offset(field, &clean_field);
	90
	91	if (offset < 0)
	92	return;
	93
	94	(u64 )((char *)current_evmcs + offset) = value;
	95
	96	current_evmcs->hv_clean_fields &= ~clean_field;
	97	}
	98
11633f69	99	static __always_inline void evmcs_write32(unsigned long field, u32 value)
75edce8a SC	100	{
	101	u16 clean_field;
	102	int offset = get_evmcs_offset(field, &clean_field);
	103
	104	if (offset < 0)
	105	return;
	106
	107	(u32 )((char *)current_evmcs + offset) = value;
	108	current_evmcs->hv_clean_fields &= ~clean_field;
	109	}
	110
11633f69	111	static __always_inline void evmcs_write16(unsigned long field, u16 value)
75edce8a SC	112	{
	113	u16 clean_field;
	114	int offset = get_evmcs_offset(field, &clean_field);
	115
	116	if (offset < 0)
	117	return;
	118
	119	(u16 )((char *)current_evmcs + offset) = value;
	120	current_evmcs->hv_clean_fields &= ~clean_field;
	121	}
	122
11633f69	123	static __always_inline u64 evmcs_read64(unsigned long field)
75edce8a SC	124	{
	125	int offset = get_evmcs_offset(field, NULL);
	126
	127	if (offset < 0)
	128	return 0;
	129
	130	return (u64 )((char *)current_evmcs + offset);
	131	}
	132
11633f69	133	static __always_inline u32 evmcs_read32(unsigned long field)
75edce8a SC	134	{
	135	int offset = get_evmcs_offset(field, NULL);
	136
	137	if (offset < 0)
	138	return 0;
	139
	140	return (u32 )((char *)current_evmcs + offset);
	141	}
	142
11633f69	143	static __always_inline u16 evmcs_read16(unsigned long field)
75edce8a SC	144	{
	145	int offset = get_evmcs_offset(field, NULL);
	146
	147	if (offset < 0)
	148	return 0;
	149
	150	return (u16 )((char *)current_evmcs + offset);
	151	}
	152
75edce8a SC	153	static inline void evmcs_load(u64 phys_addr)
	154	{
	155	struct hv_vp_assist_page *vp_ap =
	156	hv_get_vp_assist_page(smp_processor_id());
	157
6f6a657c VK	158	if (current_evmcs->hv_enlightenments_control.nested_flush_hypercall)
6f6a657c VK	159	vp_ap->nested_control.features.directhypercall = 1;
75edce8a SC	160	vp_ap->current_nested_vmcs = phys_addr;
	161	vp_ap->enlighten_vmentry = 1;
	162	}
	163
d83420c2	164	void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf);
75edce8a	165	#else /* !IS_ENABLED(CONFIG_HYPERV) */
19f10315	166	static __always_inline bool kvm_is_using_evmcs(void) { return false; }
010050a8	167	static __always_inline void evmcs_write64(unsigned long field, u64 value) {}
11633f69 SC	168	static __always_inline void evmcs_write32(unsigned long field, u32 value) {}
	169	static __always_inline void evmcs_write16(unsigned long field, u16 value) {}
	170	static __always_inline u64 evmcs_read64(unsigned long field) { return 0; }
	171	static __always_inline u32 evmcs_read32(unsigned long field) { return 0; }
	172	static __always_inline u16 evmcs_read16(unsigned long field) { return 0; }
75edce8a	173	static inline void evmcs_load(u64 phys_addr) {}
75edce8a SC	174	#endif /* IS_ENABLED(CONFIG_HYPERV) */
75edce8a SC	175
1e9dfbd7	176	#define EVMPTR_INVALID (-1ULL)
27849968	177	#define EVMPTR_MAP_PENDING (-2ULL)
1e9dfbd7 VK	178
	179	static inline bool evmptr_is_valid(u64 evmptr)
	180	{
27849968	181	return evmptr != EVMPTR_INVALID && evmptr != EVMPTR_MAP_PENDING;
1e9dfbd7 VK	182	}
1e9dfbd7 VK	183
b6a0653a VK	184	enum nested_evmptrld_status {
	185	EVMPTRLD_DISABLED,
	186	EVMPTRLD_SUCCEEDED,
	187	EVMPTRLD_VMFAIL,
	188	EVMPTRLD_ERROR,
	189	};
	190
046f5756	191	u64 nested_get_evmptr(struct kvm_vcpu *vcpu);
e2e871ab	192	uint16_t nested_get_evmcs_version(struct kvm_vcpu *vcpu);
75edce8a SC	193	int nested_enable_evmcs(struct kvm_vcpu *vcpu,
75edce8a SC	194	uint16_t *vmcs_version);
4da77090	195	void nested_evmcs_filter_control_msr(struct kvm_vcpu vcpu, u32 msr_index, u64 pdata);
a8350231	196	int nested_evmcs_check_controls(struct vmcs12 *vmcs12);
c30e9bc8	197	bool nested_evmcs_l2_tlb_flush_enabled(struct kvm_vcpu *vcpu);
b0c9c25e	198	void vmx_hv_inject_synthetic_vmexit_post_tlb_flush(struct kvm_vcpu *vcpu);
75edce8a	199
a789aeba	200	#endif /* __KVM_X86_VMX_HYPERV_H */