[linux-2.6-block.git] / arch / x86 / include / asm / sev.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * AMD Encrypted Register State Support
 *
 * Author: Joerg Roedel <jroedel@suse.de>
 */

#ifndef __ASM_ENCRYPTED_STATE_H
#define __ASM_ENCRYPTED_STATE_H

#include <linux/types.h>
#include <linux/sev-guest.h>

#include <asm/insn.h>
#include <asm/sev-common.h>
#include <asm/coco.h>

#define GHCB_PROTOCOL_MIN	1ULL
#define GHCB_PROTOCOL_MAX	2ULL
#define GHCB_DEFAULT_USAGE	0ULL

#define	VMGEXIT()			{ asm volatile("rep; vmmcall\n\r"); }

struct boot_params;

enum es_result {
	ES_OK,			/* All good */
	ES_UNSUPPORTED,		/* Requested operation not supported */
	ES_VMM_ERROR,		/* Unexpected state from the VMM */
	ES_DECODE_FAILED,	/* Instruction decoding failed */
	ES_EXCEPTION,		/* Instruction caused exception */
	ES_RETRY,		/* Retry instruction emulation */
};

struct es_fault_info {
	unsigned long vector;
	unsigned long error_code;
	unsigned long cr2;
};

struct pt_regs;

/* ES instruction emulation context */
struct es_em_ctxt {
	struct pt_regs *regs;
	struct insn insn;
	struct es_fault_info fi;
};

/*
 * AMD SEV Confidential computing blob structure. The structure is
 * defined in OVMF UEFI firmware header:
 * https://github.com/tianocore/edk2/blob/master/OvmfPkg/Include/Guid/ConfidentialComputingSevSnpBlob.h
 */
#define CC_BLOB_SEV_HDR_MAGIC	0x45444d41
struct cc_blob_sev_info {
	u32 magic;
	u16 version;
	u16 reserved;
	u64 secrets_phys;
	u32 secrets_len;
	u32 rsvd1;
	u64 cpuid_phys;
	u32 cpuid_len;
	u32 rsvd2;
} __packed;

void do_vc_no_ghcb(struct pt_regs *regs, unsigned long exit_code);

static inline u64 lower_bits(u64 val, unsigned int bits)
{
	u64 mask = (1ULL << bits) - 1;

	return (val & mask);
}

struct real_mode_header;
enum stack_type;

/* Early IDT entry points for #VC handler */
extern void vc_no_ghcb(void);
extern void vc_boot_ghcb(void);
extern bool handle_vc_boot_ghcb(struct pt_regs *regs);

/* PVALIDATE return codes */
#define PVALIDATE_FAIL_SIZEMISMATCH	6

/* Software defined (when rFlags.CF = 1) */
#define PVALIDATE_FAIL_NOUPDATE		255

/* RMUPDATE detected 4K page and 2MB page overlap. */
#define RMPUPDATE_FAIL_OVERLAP		4

/* PSMASH failed due to concurrent access by another CPU */
#define PSMASH_FAIL_INUSE		3

/* RMP page size */
#define RMP_PG_SIZE_4K			0
#define RMP_PG_SIZE_2M			1
#define RMP_TO_PG_LEVEL(level)		(((level) == RMP_PG_SIZE_4K) ? PG_LEVEL_4K : PG_LEVEL_2M)
#define PG_LEVEL_TO_RMP(level)		(((level) == PG_LEVEL_4K) ? RMP_PG_SIZE_4K : RMP_PG_SIZE_2M)

struct rmp_state {
	u64 gpa;
	u8 assigned;
	u8 pagesize;
	u8 immutable;
	u8 rsvd;
	u32 asid;
} __packed;

#define RMPADJUST_VMSA_PAGE_BIT		BIT(16)

/* SNP Guest message request */
struct snp_req_data {
	unsigned long req_gpa;
	unsigned long resp_gpa;
	unsigned long data_gpa;
	unsigned int data_npages;
};

#define MAX_AUTHTAG_LEN		32

/* See SNP spec SNP_GUEST_REQUEST section for the structure */
enum msg_type {
	SNP_MSG_TYPE_INVALID = 0,
	SNP_MSG_CPUID_REQ,
	SNP_MSG_CPUID_RSP,
	SNP_MSG_KEY_REQ,
	SNP_MSG_KEY_RSP,
	SNP_MSG_REPORT_REQ,
	SNP_MSG_REPORT_RSP,
	SNP_MSG_EXPORT_REQ,
	SNP_MSG_EXPORT_RSP,
	SNP_MSG_IMPORT_REQ,
	SNP_MSG_IMPORT_RSP,
	SNP_MSG_ABSORB_REQ,
	SNP_MSG_ABSORB_RSP,
	SNP_MSG_VMRK_REQ,
	SNP_MSG_VMRK_RSP,

	SNP_MSG_TYPE_MAX
};

enum aead_algo {
	SNP_AEAD_INVALID,
	SNP_AEAD_AES_256_GCM,
};

struct snp_guest_msg_hdr {
	u8 authtag[MAX_AUTHTAG_LEN];
	u64 msg_seqno;
	u8 rsvd1[8];
	u8 algo;
	u8 hdr_version;
	u16 hdr_sz;
	u8 msg_type;
	u8 msg_version;
	u16 msg_sz;
	u32 rsvd2;
	u8 msg_vmpck;
	u8 rsvd3[35];
} __packed;

struct snp_guest_msg {
	struct snp_guest_msg_hdr hdr;
	u8 payload[4000];
} __packed;

struct sev_guest_platform_data {
	u64 secrets_gpa;
};

/*
 * The secrets page contains 96-bytes of reserved field that can be used by
 * the guest OS. The guest OS uses the area to save the message sequence
 * number for each VMPCK.
 *
 * See the GHCB spec section Secret page layout for the format for this area.
 */
struct secrets_os_area {
	u32 msg_seqno_0;
	u32 msg_seqno_1;
	u32 msg_seqno_2;
	u32 msg_seqno_3;
	u64 ap_jump_table_pa;
	u8 rsvd[40];
	u8 guest_usage[32];
} __packed;

#define VMPCK_KEY_LEN		32

/* See the SNP spec version 0.9 for secrets page format */
struct snp_secrets_page {
	u32 version;
	u32 imien	: 1,
	    rsvd1	: 31;
	u32 fms;
	u32 rsvd2;
	u8 gosvw[16];
	u8 vmpck0[VMPCK_KEY_LEN];
	u8 vmpck1[VMPCK_KEY_LEN];
	u8 vmpck2[VMPCK_KEY_LEN];
	u8 vmpck3[VMPCK_KEY_LEN];
	struct secrets_os_area os_area;

	u8 vmsa_tweak_bitmap[64];

	/* SVSM fields */
	u64 svsm_base;
	u64 svsm_size;
	u64 svsm_caa;
	u32 svsm_max_version;
	u8 svsm_guest_vmpl;
	u8 rsvd3[3];

	/* Remainder of page */
	u8 rsvd4[3744];
} __packed;

/*
 * The SVSM Calling Area (CA) related structures.
 */
struct svsm_ca {
	u8 call_pending;
	u8 mem_available;
	u8 rsvd1[6];

	u8 svsm_buffer[PAGE_SIZE - 8];
};

#define SVSM_SUCCESS				0
#define SVSM_ERR_INCOMPLETE			0x80000000
#define SVSM_ERR_UNSUPPORTED_PROTOCOL		0x80000001
#define SVSM_ERR_UNSUPPORTED_CALL		0x80000002
#define SVSM_ERR_INVALID_ADDRESS		0x80000003
#define SVSM_ERR_INVALID_FORMAT			0x80000004
#define SVSM_ERR_INVALID_PARAMETER		0x80000005
#define SVSM_ERR_INVALID_REQUEST		0x80000006
#define SVSM_ERR_BUSY				0x80000007
#define SVSM_PVALIDATE_FAIL_SIZEMISMATCH	0x80001006

/*
 * The SVSM PVALIDATE related structures
 */
struct svsm_pvalidate_entry {
	u64 page_size		: 2,
	    action		: 1,
	    ignore_cf		: 1,
	    rsvd		: 8,
	    pfn			: 52;
};

struct svsm_pvalidate_call {
	u16 num_entries;
	u16 cur_index;

	u8 rsvd1[4];

	struct svsm_pvalidate_entry entry[];
};

#define SVSM_PVALIDATE_MAX_COUNT	((sizeof_field(struct svsm_ca, svsm_buffer) -		\
					  offsetof(struct svsm_pvalidate_call, entry)) /	\
					 sizeof(struct svsm_pvalidate_entry))

/*
 * The SVSM Attestation related structures
 */
struct svsm_loc_entry {
	u64 pa;
	u32 len;
	u8 rsvd[4];
};

struct svsm_attest_call {
	struct svsm_loc_entry report_buf;
	struct svsm_loc_entry nonce;
	struct svsm_loc_entry manifest_buf;
	struct svsm_loc_entry certificates_buf;

	/* For attesting a single service */
	u8 service_guid[16];
	u32 service_manifest_ver;
	u8 rsvd[4];
};

/*
 * SVSM protocol structure
 */
struct svsm_call {
	struct svsm_ca *caa;
	u64 rax;
	u64 rcx;
	u64 rdx;
	u64 r8;
	u64 r9;
	u64 rax_out;
	u64 rcx_out;
	u64 rdx_out;
	u64 r8_out;
	u64 r9_out;
};

#define SVSM_CORE_CALL(x)		((0ULL << 32) | (x))
#define SVSM_CORE_REMAP_CA		0
#define SVSM_CORE_PVALIDATE		1
#define SVSM_CORE_CREATE_VCPU		2
#define SVSM_CORE_DELETE_VCPU		3

#define SVSM_ATTEST_CALL(x)		((1ULL << 32) | (x))
#define SVSM_ATTEST_SERVICES		0
#define SVSM_ATTEST_SINGLE_SERVICE	1

#ifdef CONFIG_AMD_MEM_ENCRYPT

extern u8 snp_vmpl;

extern void __sev_es_ist_enter(struct pt_regs *regs);
extern void __sev_es_ist_exit(void);
static __always_inline void sev_es_ist_enter(struct pt_regs *regs)
{
	if (cc_vendor == CC_VENDOR_AMD &&
	    cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT))
		__sev_es_ist_enter(regs);
}
static __always_inline void sev_es_ist_exit(void)
{
	if (cc_vendor == CC_VENDOR_AMD &&
	    cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT))
		__sev_es_ist_exit();
}
extern int sev_es_setup_ap_jump_table(struct real_mode_header *rmh);
extern void __sev_es_nmi_complete(void);
static __always_inline void sev_es_nmi_complete(void)
{
	if (cc_vendor == CC_VENDOR_AMD &&
	    cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT))
		__sev_es_nmi_complete();
}
extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd);
extern void sev_enable(struct boot_params *bp);

/*
 * RMPADJUST modifies the RMP permissions of a page of a lesser-
 * privileged (numerically higher) VMPL.
 *
 * If the guest is running at a higher-privilege than the privilege
 * level the instruction is targeting, the instruction will succeed,
 * otherwise, it will fail.
 */
static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs)
{
	int rc;

	/* "rmpadjust" mnemonic support in binutils 2.36 and newer */
	asm volatile(".byte 0xF3,0x0F,0x01,0xFE\n\t"
		     : "=a"(rc)
		     : "a"(vaddr), "c"(rmp_psize), "d"(attrs)
		     : "memory", "cc");

	return rc;
}
static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate)
{
	bool no_rmpupdate;
	int rc;

	/* "pvalidate" mnemonic support in binutils 2.36 and newer */
	asm volatile(".byte 0xF2, 0x0F, 0x01, 0xFF\n\t"
		     CC_SET(c)
		     : CC_OUT(c) (no_rmpupdate), "=a"(rc)
		     : "a"(vaddr), "c"(rmp_psize), "d"(validate)
		     : "memory", "cc");

	if (no_rmpupdate)
		return PVALIDATE_FAIL_NOUPDATE;

	return rc;
}

struct snp_guest_request_ioctl;

void setup_ghcb(void);
void early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr,
				  unsigned long npages);
void early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr,
				 unsigned long npages);
void snp_set_memory_shared(unsigned long vaddr, unsigned long npages);
void snp_set_memory_private(unsigned long vaddr, unsigned long npages);
void snp_set_wakeup_secondary_cpu(void);
bool snp_init(struct boot_params *bp);
void __noreturn snp_abort(void);
void snp_dmi_setup(void);
int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, struct snp_guest_request_ioctl *rio);
int snp_issue_svsm_attest_req(u64 call_id, struct svsm_call *call, struct svsm_attest_call *input);
void snp_accept_memory(phys_addr_t start, phys_addr_t end);
u64 snp_get_unsupported_features(u64 status);
u64 sev_get_status(void);
void sev_show_status(void);
void snp_update_svsm_ca(void);

#else	/* !CONFIG_AMD_MEM_ENCRYPT */

#define snp_vmpl 0
static inline void sev_es_ist_enter(struct pt_regs *regs) { }
static inline void sev_es_ist_exit(void) { }
static inline int sev_es_setup_ap_jump_table(struct real_mode_header *rmh) { return 0; }
static inline void sev_es_nmi_complete(void) { }
static inline int sev_es_efi_map_ghcbs(pgd_t *pgd) { return 0; }
static inline void sev_enable(struct boot_params *bp) { }
static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate) { return 0; }
static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs) { return 0; }
static inline void setup_ghcb(void) { }
static inline void __init
early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, unsigned long npages) { }
static inline void __init
early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, unsigned long npages) { }
static inline void snp_set_memory_shared(unsigned long vaddr, unsigned long npages) { }
static inline void snp_set_memory_private(unsigned long vaddr, unsigned long npages) { }
static inline void snp_set_wakeup_secondary_cpu(void) { }
static inline bool snp_init(struct boot_params *bp) { return false; }
static inline void snp_abort(void) { }
static inline void snp_dmi_setup(void) { }
static inline int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, struct snp_guest_request_ioctl *rio)
{
	return -ENOTTY;
}
static inline int snp_issue_svsm_attest_req(u64 call_id, struct svsm_call *call, struct svsm_attest_call *input)
{
	return -ENOTTY;
}
static inline void snp_accept_memory(phys_addr_t start, phys_addr_t end) { }
static inline u64 snp_get_unsupported_features(u64 status) { return 0; }
static inline u64 sev_get_status(void) { return 0; }
static inline void sev_show_status(void) { }
static inline void snp_update_svsm_ca(void) { }

#endif	/* CONFIG_AMD_MEM_ENCRYPT */

#ifdef CONFIG_KVM_AMD_SEV
bool snp_probe_rmptable_info(void);
int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level);
void snp_dump_hva_rmpentry(unsigned long address);
int psmash(u64 pfn);
int rmp_make_private(u64 pfn, u64 gpa, enum pg_level level, u32 asid, bool immutable);
int rmp_make_shared(u64 pfn, enum pg_level level);
void snp_leak_pages(u64 pfn, unsigned int npages);
void kdump_sev_callback(void);
void snp_fixup_e820_tables(void);
#else
static inline bool snp_probe_rmptable_info(void) { return false; }
static inline int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level) { return -ENODEV; }
static inline void snp_dump_hva_rmpentry(unsigned long address) {}
static inline int psmash(u64 pfn) { return -ENODEV; }
static inline int rmp_make_private(u64 pfn, u64 gpa, enum pg_level level, u32 asid,
				   bool immutable)
{
	return -ENODEV;
}
static inline int rmp_make_shared(u64 pfn, enum pg_level level) { return -ENODEV; }
static inline void snp_leak_pages(u64 pfn, unsigned int npages) {}
static inline void kdump_sev_callback(void) { }
static inline void snp_fixup_e820_tables(void) {}
#endif

#endif
Commit	Line	Data
	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	/*
	3	* AMD Encrypted Register State Support
	4	*
	5	* Author: Joerg Roedel <jroedel@suse.de>
	6	*/
	7
	8	#ifndef __ASM_ENCRYPTED_STATE_H
	9	#define __ASM_ENCRYPTED_STATE_H
	10
	11	#include <linux/types.h>
	12	#include <linux/sev-guest.h>
	13
	14	#include <asm/insn.h>
	15	#include <asm/sev-common.h>
	16	#include <asm/coco.h>
	17
	18	#define GHCB_PROTOCOL_MIN 1ULL
	19	#define GHCB_PROTOCOL_MAX 2ULL
	20	#define GHCB_DEFAULT_USAGE 0ULL
	21
	22	#define VMGEXIT() { asm volatile("rep; vmmcall\n\r"); }
	23
	24	struct boot_params;
	25
	26	enum es_result {
	27	ES_OK, /* All good */
	28	ES_UNSUPPORTED, /* Requested operation not supported */
	29	ES_VMM_ERROR, /* Unexpected state from the VMM */
	30	ES_DECODE_FAILED, /* Instruction decoding failed */
	31	ES_EXCEPTION, /* Instruction caused exception */
	32	ES_RETRY, /* Retry instruction emulation */
	33	};
	34
	35	struct es_fault_info {
	36	unsigned long vector;
	37	unsigned long error_code;
	38	unsigned long cr2;
	39	};
	40
	41	struct pt_regs;
	42
	43	/* ES instruction emulation context */
	44	struct es_em_ctxt {
	45	struct pt_regs *regs;
	46	struct insn insn;
	47	struct es_fault_info fi;
	48	};
	49
	50	/*
	51	* AMD SEV Confidential computing blob structure. The structure is
	52	* defined in OVMF UEFI firmware header:
	53	* https://github.com/tianocore/edk2/blob/master/OvmfPkg/Include/Guid/ConfidentialComputingSevSnpBlob.h
	54	*/
	55	#define CC_BLOB_SEV_HDR_MAGIC 0x45444d41
	56	struct cc_blob_sev_info {
	57	u32 magic;
	58	u16 version;
	59	u16 reserved;
	60	u64 secrets_phys;
	61	u32 secrets_len;
	62	u32 rsvd1;
	63	u64 cpuid_phys;
	64	u32 cpuid_len;
	65	u32 rsvd2;
	66	} __packed;
	67
	68	void do_vc_no_ghcb(struct pt_regs *regs, unsigned long exit_code);
	69
	70	static inline u64 lower_bits(u64 val, unsigned int bits)
	71	{
	72	u64 mask = (1ULL << bits) - 1;
	73
	74	return (val & mask);
	75	}
	76
	77	struct real_mode_header;
	78	enum stack_type;
	79
	80	/* Early IDT entry points for #VC handler */
	81	extern void vc_no_ghcb(void);
	82	extern void vc_boot_ghcb(void);
	83	extern bool handle_vc_boot_ghcb(struct pt_regs *regs);
	84
	85	/* PVALIDATE return codes */
	86	#define PVALIDATE_FAIL_SIZEMISMATCH 6
	87
	88	/* Software defined (when rFlags.CF = 1) */
	89	#define PVALIDATE_FAIL_NOUPDATE 255
	90
	91	/* RMUPDATE detected 4K page and 2MB page overlap. */
	92	#define RMPUPDATE_FAIL_OVERLAP 4
	93
	94	/* PSMASH failed due to concurrent access by another CPU */
	95	#define PSMASH_FAIL_INUSE 3
	96
	97	/* RMP page size */
	98	#define RMP_PG_SIZE_4K 0
	99	#define RMP_PG_SIZE_2M 1
	100	#define RMP_TO_PG_LEVEL(level) (((level) == RMP_PG_SIZE_4K) ? PG_LEVEL_4K : PG_LEVEL_2M)
	101	#define PG_LEVEL_TO_RMP(level) (((level) == PG_LEVEL_4K) ? RMP_PG_SIZE_4K : RMP_PG_SIZE_2M)
	102
	103	struct rmp_state {
	104	u64 gpa;
	105	u8 assigned;
	106	u8 pagesize;
	107	u8 immutable;
	108	u8 rsvd;
	109	u32 asid;
	110	} __packed;
	111
	112	#define RMPADJUST_VMSA_PAGE_BIT BIT(16)
	113
	114	/* SNP Guest message request */
	115	struct snp_req_data {
	116	unsigned long req_gpa;
	117	unsigned long resp_gpa;
	118	unsigned long data_gpa;
	119	unsigned int data_npages;
	120	};
	121
	122	#define MAX_AUTHTAG_LEN 32
	123
	124	/* See SNP spec SNP_GUEST_REQUEST section for the structure */
	125	enum msg_type {
	126	SNP_MSG_TYPE_INVALID = 0,
	127	SNP_MSG_CPUID_REQ,
	128	SNP_MSG_CPUID_RSP,
	129	SNP_MSG_KEY_REQ,
	130	SNP_MSG_KEY_RSP,
	131	SNP_MSG_REPORT_REQ,
	132	SNP_MSG_REPORT_RSP,
	133	SNP_MSG_EXPORT_REQ,
	134	SNP_MSG_EXPORT_RSP,
	135	SNP_MSG_IMPORT_REQ,
	136	SNP_MSG_IMPORT_RSP,
	137	SNP_MSG_ABSORB_REQ,
	138	SNP_MSG_ABSORB_RSP,
	139	SNP_MSG_VMRK_REQ,
	140	SNP_MSG_VMRK_RSP,
	141
	142	SNP_MSG_TYPE_MAX
	143	};
	144
	145	enum aead_algo {
	146	SNP_AEAD_INVALID,
	147	SNP_AEAD_AES_256_GCM,
	148	};
	149
	150	struct snp_guest_msg_hdr {
	151	u8 authtag[MAX_AUTHTAG_LEN];
	152	u64 msg_seqno;
	153	u8 rsvd1[8];
	154	u8 algo;
	155	u8 hdr_version;
	156	u16 hdr_sz;
	157	u8 msg_type;
	158	u8 msg_version;
	159	u16 msg_sz;
	160	u32 rsvd2;
	161	u8 msg_vmpck;
	162	u8 rsvd3[35];
	163	} __packed;
	164
	165	struct snp_guest_msg {
	166	struct snp_guest_msg_hdr hdr;
	167	u8 payload[4000];
	168	} __packed;
	169
	170	struct sev_guest_platform_data {
	171	u64 secrets_gpa;
	172	};
	173
	174	/*
	175	* The secrets page contains 96-bytes of reserved field that can be used by
	176	* the guest OS. The guest OS uses the area to save the message sequence
	177	* number for each VMPCK.
	178	*
	179	* See the GHCB spec section Secret page layout for the format for this area.
	180	*/
	181	struct secrets_os_area {
	182	u32 msg_seqno_0;
	183	u32 msg_seqno_1;
	184	u32 msg_seqno_2;
	185	u32 msg_seqno_3;
	186	u64 ap_jump_table_pa;
	187	u8 rsvd[40];
	188	u8 guest_usage[32];
	189	} __packed;
	190
	191	#define VMPCK_KEY_LEN 32
	192
	193	/* See the SNP spec version 0.9 for secrets page format */
	194	struct snp_secrets_page {
	195	u32 version;
	196	u32 imien : 1,
	197	rsvd1 : 31;
	198	u32 fms;
	199	u32 rsvd2;
	200	u8 gosvw[16];
	201	u8 vmpck0[VMPCK_KEY_LEN];
	202	u8 vmpck1[VMPCK_KEY_LEN];
	203	u8 vmpck2[VMPCK_KEY_LEN];
	204	u8 vmpck3[VMPCK_KEY_LEN];
	205	struct secrets_os_area os_area;
	206
	207	u8 vmsa_tweak_bitmap[64];
	208
	209	/* SVSM fields */
	210	u64 svsm_base;
	211	u64 svsm_size;
	212	u64 svsm_caa;
	213	u32 svsm_max_version;
	214	u8 svsm_guest_vmpl;
	215	u8 rsvd3[3];
	216
	217	/* Remainder of page */
	218	u8 rsvd4[3744];
	219	} __packed;
	220
	221	/*
	222	* The SVSM Calling Area (CA) related structures.
	223	*/
	224	struct svsm_ca {
	225	u8 call_pending;
	226	u8 mem_available;
	227	u8 rsvd1[6];
	228
	229	u8 svsm_buffer[PAGE_SIZE - 8];
	230	};
	231
	232	#define SVSM_SUCCESS 0
	233	#define SVSM_ERR_INCOMPLETE 0x80000000
	234	#define SVSM_ERR_UNSUPPORTED_PROTOCOL 0x80000001
	235	#define SVSM_ERR_UNSUPPORTED_CALL 0x80000002
	236	#define SVSM_ERR_INVALID_ADDRESS 0x80000003
	237	#define SVSM_ERR_INVALID_FORMAT 0x80000004
	238	#define SVSM_ERR_INVALID_PARAMETER 0x80000005
	239	#define SVSM_ERR_INVALID_REQUEST 0x80000006
	240	#define SVSM_ERR_BUSY 0x80000007
	241	#define SVSM_PVALIDATE_FAIL_SIZEMISMATCH 0x80001006
	242
	243	/*
	244	* The SVSM PVALIDATE related structures
	245	*/
	246	struct svsm_pvalidate_entry {
	247	u64 page_size : 2,
	248	action : 1,
	249	ignore_cf : 1,
	250	rsvd : 8,
	251	pfn : 52;
	252	};
	253
	254	struct svsm_pvalidate_call {
	255	u16 num_entries;
	256	u16 cur_index;
	257
	258	u8 rsvd1[4];
	259
	260	struct svsm_pvalidate_entry entry[];
	261	};
	262
	263	#define SVSM_PVALIDATE_MAX_COUNT ((sizeof_field(struct svsm_ca, svsm_buffer) - \
	264	offsetof(struct svsm_pvalidate_call, entry)) / \
	265	sizeof(struct svsm_pvalidate_entry))
	266
	267	/*
	268	* The SVSM Attestation related structures
	269	*/
	270	struct svsm_loc_entry {
	271	u64 pa;
	272	u32 len;
	273	u8 rsvd[4];
	274	};
	275
	276	struct svsm_attest_call {
	277	struct svsm_loc_entry report_buf;
	278	struct svsm_loc_entry nonce;
	279	struct svsm_loc_entry manifest_buf;
	280	struct svsm_loc_entry certificates_buf;
	281
	282	/* For attesting a single service */
	283	u8 service_guid[16];
	284	u32 service_manifest_ver;
	285	u8 rsvd[4];
	286	};
	287
	288	/*
	289	* SVSM protocol structure
	290	*/
	291	struct svsm_call {
	292	struct svsm_ca *caa;
	293	u64 rax;
	294	u64 rcx;
	295	u64 rdx;
	296	u64 r8;
	297	u64 r9;
	298	u64 rax_out;
	299	u64 rcx_out;
	300	u64 rdx_out;
	301	u64 r8_out;
	302	u64 r9_out;
	303	};
	304
	305	#define SVSM_CORE_CALL(x) ((0ULL << 32) \| (x))
	306	#define SVSM_CORE_REMAP_CA 0
	307	#define SVSM_CORE_PVALIDATE 1
	308	#define SVSM_CORE_CREATE_VCPU 2
	309	#define SVSM_CORE_DELETE_VCPU 3
	310
	311	#define SVSM_ATTEST_CALL(x) ((1ULL << 32) \| (x))
	312	#define SVSM_ATTEST_SERVICES 0
	313	#define SVSM_ATTEST_SINGLE_SERVICE 1
	314
	315	#ifdef CONFIG_AMD_MEM_ENCRYPT
	316
	317	extern u8 snp_vmpl;
	318
	319	extern void __sev_es_ist_enter(struct pt_regs *regs);
	320	extern void __sev_es_ist_exit(void);
	321	static __always_inline void sev_es_ist_enter(struct pt_regs *regs)
	322	{
	323	if (cc_vendor == CC_VENDOR_AMD &&
	324	cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT))
	325	__sev_es_ist_enter(regs);
	326	}
	327	static __always_inline void sev_es_ist_exit(void)
	328	{
	329	if (cc_vendor == CC_VENDOR_AMD &&
	330	cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT))
	331	__sev_es_ist_exit();
	332	}
	333	extern int sev_es_setup_ap_jump_table(struct real_mode_header *rmh);
	334	extern void __sev_es_nmi_complete(void);
	335	static __always_inline void sev_es_nmi_complete(void)
	336	{
	337	if (cc_vendor == CC_VENDOR_AMD &&
	338	cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT))
	339	__sev_es_nmi_complete();
	340	}
	341	extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd);
	342	extern void sev_enable(struct boot_params *bp);
	343
	344	/*
	345	* RMPADJUST modifies the RMP permissions of a page of a lesser-
	346	* privileged (numerically higher) VMPL.
	347	*
	348	* If the guest is running at a higher-privilege than the privilege
	349	* level the instruction is targeting, the instruction will succeed,
	350	* otherwise, it will fail.
	351	*/
	352	static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs)
	353	{
	354	int rc;
	355
	356	/* "rmpadjust" mnemonic support in binutils 2.36 and newer */
	357	asm volatile(".byte 0xF3,0x0F,0x01,0xFE\n\t"
	358	: "=a"(rc)
	359	: "a"(vaddr), "c"(rmp_psize), "d"(attrs)
	360	: "memory", "cc");
	361
	362	return rc;
	363	}
	364	static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate)
	365	{
	366	bool no_rmpupdate;
	367	int rc;
	368
	369	/* "pvalidate" mnemonic support in binutils 2.36 and newer */
	370	asm volatile(".byte 0xF2, 0x0F, 0x01, 0xFF\n\t"
	371	CC_SET(c)
	372	: CC_OUT(c) (no_rmpupdate), "=a"(rc)
	373	: "a"(vaddr), "c"(rmp_psize), "d"(validate)
	374	: "memory", "cc");
	375
	376	if (no_rmpupdate)
	377	return PVALIDATE_FAIL_NOUPDATE;
	378
	379	return rc;
	380	}
	381
	382	struct snp_guest_request_ioctl;
	383
	384	void setup_ghcb(void);
	385	void early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr,
	386	unsigned long npages);
	387	void early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr,
	388	unsigned long npages);
	389	void snp_set_memory_shared(unsigned long vaddr, unsigned long npages);
	390	void snp_set_memory_private(unsigned long vaddr, unsigned long npages);
	391	void snp_set_wakeup_secondary_cpu(void);
	392	bool snp_init(struct boot_params *bp);
	393	void __noreturn snp_abort(void);
	394	void snp_dmi_setup(void);
	395	int snp_issue_guest_request(u64 exit_code, struct snp_req_data input, struct snp_guest_request_ioctl rio);
	396	int snp_issue_svsm_attest_req(u64 call_id, struct svsm_call call, struct svsm_attest_call input);
	397	void snp_accept_memory(phys_addr_t start, phys_addr_t end);
	398	u64 snp_get_unsupported_features(u64 status);
	399	u64 sev_get_status(void);
	400	void sev_show_status(void);
	401	void snp_update_svsm_ca(void);
	402
	403	#else /* !CONFIG_AMD_MEM_ENCRYPT */
	404
	405	#define snp_vmpl 0
	406	static inline void sev_es_ist_enter(struct pt_regs *regs) { }
	407	static inline void sev_es_ist_exit(void) { }
	408	static inline int sev_es_setup_ap_jump_table(struct real_mode_header *rmh) { return 0; }
	409	static inline void sev_es_nmi_complete(void) { }
	410	static inline int sev_es_efi_map_ghcbs(pgd_t *pgd) { return 0; }
	411	static inline void sev_enable(struct boot_params *bp) { }
	412	static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate) { return 0; }
	413	static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs) { return 0; }
	414	static inline void setup_ghcb(void) { }
	415	static inline void __init
	416	early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, unsigned long npages) { }
	417	static inline void __init
	418	early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, unsigned long npages) { }
	419	static inline void snp_set_memory_shared(unsigned long vaddr, unsigned long npages) { }
	420	static inline void snp_set_memory_private(unsigned long vaddr, unsigned long npages) { }
	421	static inline void snp_set_wakeup_secondary_cpu(void) { }
	422	static inline bool snp_init(struct boot_params *bp) { return false; }
	423	static inline void snp_abort(void) { }
	424	static inline void snp_dmi_setup(void) { }
	425	static inline int snp_issue_guest_request(u64 exit_code, struct snp_req_data input, struct snp_guest_request_ioctl rio)
	426	{
	427	return -ENOTTY;
	428	}
	429	static inline int snp_issue_svsm_attest_req(u64 call_id, struct svsm_call call, struct svsm_attest_call input)
	430	{
	431	return -ENOTTY;
	432	}
	433	static inline void snp_accept_memory(phys_addr_t start, phys_addr_t end) { }
	434	static inline u64 snp_get_unsupported_features(u64 status) { return 0; }
	435	static inline u64 sev_get_status(void) { return 0; }
	436	static inline void sev_show_status(void) { }
	437	static inline void snp_update_svsm_ca(void) { }
	438
	439	#endif /* CONFIG_AMD_MEM_ENCRYPT */
	440
	441	#ifdef CONFIG_KVM_AMD_SEV
	442	bool snp_probe_rmptable_info(void);
	443	int snp_lookup_rmpentry(u64 pfn, bool assigned, int level);
	444	void snp_dump_hva_rmpentry(unsigned long address);
	445	int psmash(u64 pfn);
	446	int rmp_make_private(u64 pfn, u64 gpa, enum pg_level level, u32 asid, bool immutable);
	447	int rmp_make_shared(u64 pfn, enum pg_level level);
	448	void snp_leak_pages(u64 pfn, unsigned int npages);
	449	void kdump_sev_callback(void);
	450	void snp_fixup_e820_tables(void);
	451	#else
	452	static inline bool snp_probe_rmptable_info(void) { return false; }
	453	static inline int snp_lookup_rmpentry(u64 pfn, bool assigned, int level) { return -ENODEV; }
	454	static inline void snp_dump_hva_rmpentry(unsigned long address) {}
	455	static inline int psmash(u64 pfn) { return -ENODEV; }
	456	static inline int rmp_make_private(u64 pfn, u64 gpa, enum pg_level level, u32 asid,
	457	bool immutable)
	458	{
	459	return -ENODEV;
	460	}
	461	static inline int rmp_make_shared(u64 pfn, enum pg_level level) { return -ENODEV; }
	462	static inline void snp_leak_pages(u64 pfn, unsigned int npages) {}
	463	static inline void kdump_sev_callback(void) { }
	464	static inline void snp_fixup_e820_tables(void) {}
	465	#endif
	466
	467	#endif