arch/x86/include/asm/sev.h - linux - Git at Google

 /* 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/bootparam.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"); }

 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

 /* RMP page size */
 #define RMP_PG_SIZE_4K			0
 #define RMP_PG_SIZE_2M			1

 #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;
 };

 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_layout {
 	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 rsvd3[3840];
 } __packed;

 #ifdef CONFIG_AMD_MEM_ENCRYPT
 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);

 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 __init early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr,
 					 unsigned long npages);
 void __init early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr,
 					unsigned long npages);
 void __init snp_prep_memory(unsigned long paddr, unsigned int sz, enum psc_op op);
 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 __init __noreturn snp_abort(void);
 int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, struct snp_guest_request_ioctl *rio);
 void snp_accept_memory(phys_addr_t start, phys_addr_t end);
 u64 snp_get_unsupported_features(u64 status);
 u64 sev_get_status(void);
 #else
 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 __init snp_prep_memory(unsigned long paddr, unsigned int sz, enum psc_op op) { }
 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 int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, struct snp_guest_request_ioctl *rio)
 {
 	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; }
 #endif

 #endif
	/* 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/bootparam.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"); }

	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

	/* RMP page size */
	#define RMP_PG_SIZE_4K 0
	#define RMP_PG_SIZE_2M 1

	#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;
	};

	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_layout {
	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 rsvd3[3840];
	} __packed;

	#ifdef CONFIG_AMD_MEM_ENCRYPT
	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);

	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 __init early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr,
	unsigned long npages);
	void __init early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr,
	unsigned long npages);
	void __init snp_prep_memory(unsigned long paddr, unsigned int sz, enum psc_op op);
	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 __init __noreturn snp_abort(void);
	int snp_issue_guest_request(u64 exit_code, struct snp_req_data input, struct snp_guest_request_ioctl rio);
	void snp_accept_memory(phys_addr_t start, phys_addr_t end);
	u64 snp_get_unsupported_features(u64 status);
	u64 sev_get_status(void);
	#else
	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 __init snp_prep_memory(unsigned long paddr, unsigned int sz, enum psc_op op) { }
	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 int snp_issue_guest_request(u64 exit_code, struct snp_req_data input, struct snp_guest_request_ioctl rio)
	{
	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; }
	#endif

	#endif