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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 <asm/insn.h>
13#include <asm/sev-common.h>
14
15#define GHCB_PROTO_OUR 0x0001UL
16#define GHCB_PROTOCOL_MAX 1ULL
17#define GHCB_DEFAULT_USAGE 0ULL
18
19#define VMGEXIT() { asm volatile("rep; vmmcall\n\r"); }
20
21enum es_result {
22 ES_OK, /* All good */
23 ES_UNSUPPORTED, /* Requested operation not supported */
24 ES_VMM_ERROR, /* Unexpected state from the VMM */
25 ES_DECODE_FAILED, /* Instruction decoding failed */
26 ES_EXCEPTION, /* Instruction caused exception */
27 ES_RETRY, /* Retry instruction emulation */
28};
29
30struct es_fault_info {
31 unsigned long vector;
32 unsigned long error_code;
33 unsigned long cr2;
34};
35
36struct pt_regs;
37
38/* ES instruction emulation context */
39struct es_em_ctxt {
40 struct pt_regs *regs;
41 struct insn insn;
42 struct es_fault_info fi;
43};
44
45void do_vc_no_ghcb(struct pt_regs *regs, unsigned long exit_code);
46
47static inline u64 lower_bits(u64 val, unsigned int bits)
48{
49 u64 mask = (1ULL << bits) - 1;
50
51 return (val & mask);
52}
53
54struct real_mode_header;
55enum stack_type;
56
57/* Early IDT entry points for #VC handler */
58extern void vc_no_ghcb(void);
59extern void vc_boot_ghcb(void);
60extern bool handle_vc_boot_ghcb(struct pt_regs *regs);
61
62#ifdef CONFIG_AMD_MEM_ENCRYPT
63extern struct static_key_false sev_es_enable_key;
64extern void __sev_es_ist_enter(struct pt_regs *regs);
65extern void __sev_es_ist_exit(void);
66static __always_inline void sev_es_ist_enter(struct pt_regs *regs)
67{
68 if (static_branch_unlikely(&sev_es_enable_key))
69 __sev_es_ist_enter(regs);
70}
71static __always_inline void sev_es_ist_exit(void)
72{
73 if (static_branch_unlikely(&sev_es_enable_key))
74 __sev_es_ist_exit();
75}
76extern int sev_es_setup_ap_jump_table(struct real_mode_header *rmh);
77extern void __sev_es_nmi_complete(void);
78static __always_inline void sev_es_nmi_complete(void)
79{
80 if (static_branch_unlikely(&sev_es_enable_key))
81 __sev_es_nmi_complete();
82}
83extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd);
84#else
85static inline void sev_es_ist_enter(struct pt_regs *regs) { }
86static inline void sev_es_ist_exit(void) { }
87static inline int sev_es_setup_ap_jump_table(struct real_mode_header *rmh) { return 0; }
88static inline void sev_es_nmi_complete(void) { }
89static inline int sev_es_efi_map_ghcbs(pgd_t *pgd) { return 0; }
90#endif
91
92#endif