summaryrefslogtreecommitdiffstats
path: root/arch/x86/include/asm/mem_encrypt.h
blob: 848ce43b9040d6876f95d808b0a4a2e413949185 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * AMD Memory Encryption Support
 *
 * Copyright (C) 2016 Advanced Micro Devices, Inc.
 *
 * Author: Tom Lendacky <thomas.lendacky@amd.com>
 */

#ifndef __X86_MEM_ENCRYPT_H__
#define __X86_MEM_ENCRYPT_H__

#ifndef __ASSEMBLY__

#include <linux/init.h>

#include <asm/bootparam.h>

#ifdef CONFIG_AMD_MEM_ENCRYPT

extern u64 sme_me_mask;
extern bool sev_enabled;

void sme_encrypt_execute(unsigned long encrypted_kernel_vaddr,
			 unsigned long decrypted_kernel_vaddr,
			 unsigned long kernel_len,
			 unsigned long encryption_wa,
			 unsigned long encryption_pgd);

void __init sme_early_encrypt(resource_size_t paddr,
			      unsigned long size);
void __init sme_early_decrypt(resource_size_t paddr,
			      unsigned long size);

void __init sme_map_bootdata(char *real_mode_data);
void __init sme_unmap_bootdata(char *real_mode_data);

void __init sme_early_init(void);

void __init sme_encrypt_kernel(struct boot_params *bp);
void __init sme_enable(struct boot_params *bp);

int __init early_set_memory_decrypted(unsigned long vaddr, unsigned long size);
int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size);

/* Architecture __weak replacement functions */
void __init mem_encrypt_init(void);
void __init mem_encrypt_free_decrypted_mem(void);

bool sme_active(void);
bool sev_active(void);

#define __bss_decrypted __attribute__((__section__(".bss..decrypted")))

#else	/* !CONFIG_AMD_MEM_ENCRYPT */

#define sme_me_mask	0ULL

static inline void __init sme_early_encrypt(resource_size_t paddr,
					    unsigned long size) { }
static inline void __init sme_early_decrypt(resource_size_t paddr,
					    unsigned long size) { }

static inline void __init sme_map_bootdata(char *real_mode_data) { }
static inline void __init sme_unmap_bootdata(char *real_mode_data) { }

static inline void __init sme_early_init(void) { }

static inline void __init sme_encrypt_kernel(struct boot_params *bp) { }
static inline void __init sme_enable(struct boot_params *bp) { }

static inline bool sme_active(void) { return false; }
static inline bool sev_active(void) { return false; }

static inline int __init
early_set_memory_decrypted(unsigned long vaddr, unsigned long size) { return 0; }
static inline int __init
early_set_memory_encrypted(unsigned long vaddr, unsigned long size) { return 0; }

#define __bss_decrypted

#endif	/* CONFIG_AMD_MEM_ENCRYPT */

/*
 * The __sme_pa() and __sme_pa_nodebug() macros are meant for use when
 * writing to or comparing values from the cr3 register.  Having the
 * encryption mask set in cr3 enables the PGD entry to be encrypted and
 * avoid special case handling of PGD allocations.
 */
#define __sme_pa(x)		(__pa(x) | sme_me_mask)
#define __sme_pa_nodebug(x)	(__pa_nodebug(x) | sme_me_mask)

extern char __start_bss_decrypted[], __end_bss_decrypted[], __start_bss_decrypted_unused[];

static inline bool mem_encrypt_active(void)
{
	return sme_me_mask;
}

static inline u64 sme_get_me_mask(void)
{
	return sme_me_mask;
}

#endif	/* __ASSEMBLY__ */

#endif	/* __X86_MEM_ENCRYPT_H__ */