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/* 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 <asm/insn.h>
#define GHCB_SEV_INFO 0x001UL
#define GHCB_SEV_INFO_REQ 0x002UL
#define GHCB_INFO(v) ((v) & 0xfffUL)
#define GHCB_PROTO_MAX(v) (((v) >> 48) & 0xffffUL)
#define GHCB_PROTO_MIN(v) (((v) >> 32) & 0xffffUL)
#define GHCB_PROTO_OUR 0x0001UL
#define GHCB_SEV_CPUID_REQ 0x004UL
#define GHCB_CPUID_REQ_EAX 0
#define GHCB_CPUID_REQ_EBX 1
#define GHCB_CPUID_REQ_ECX 2
#define GHCB_CPUID_REQ_EDX 3
#define GHCB_CPUID_REQ(fn, reg) (GHCB_SEV_CPUID_REQ | \
(((unsigned long)reg & 3) << 30) | \
(((unsigned long)fn) << 32))
#define GHCB_PROTOCOL_MAX 0x0001UL
#define GHCB_DEFAULT_USAGE 0x0000UL
#define GHCB_SEV_CPUID_RESP 0x005UL
#define GHCB_SEV_TERMINATE 0x100UL
#define GHCB_SEV_TERMINATE_REASON(reason_set, reason_val) \
(((((u64)reason_set) & 0x7) << 12) | \
((((u64)reason_val) & 0xff) << 16))
#define GHCB_SEV_ES_REASON_GENERAL_REQUEST 0
#define GHCB_SEV_ES_REASON_PROTOCOL_UNSUPPORTED 1
#define GHCB_SEV_GHCB_RESP_CODE(v) ((v) & 0xfff)
#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;
};
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);
#ifdef CONFIG_AMD_MEM_ENCRYPT
extern struct static_key_false sev_es_enable_key;
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 (static_branch_unlikely(&sev_es_enable_key))
__sev_es_ist_enter(regs);
}
static __always_inline void sev_es_ist_exit(void)
{
if (static_branch_unlikely(&sev_es_enable_key))
__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 (static_branch_unlikely(&sev_es_enable_key))
__sev_es_nmi_complete();
}
extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd);
#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; }
#endif
#endif
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