1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * AMD Memory Encryption Support
4 *
5 * Copyright (C) 2016 Advanced Micro Devices, Inc.
6 *
7 * Author: Tom Lendacky <thomas.lendacky@amd.com>
8 */
9
10 #ifndef __X86_MEM_ENCRYPT_H__
11 #define __X86_MEM_ENCRYPT_H__
12
13 #ifndef __ASSEMBLY__
14
15 #include <linux/init.h>
16 #include <linux/cc_platform.h>
17
18 #include <asm/bootparam.h>
19
20 #ifdef CONFIG_X86_MEM_ENCRYPT
21 void __init mem_encrypt_init(void);
22 #else
mem_encrypt_init(void)23 static inline void mem_encrypt_init(void) { }
24 #endif
25
26 #ifdef CONFIG_AMD_MEM_ENCRYPT
27
28 extern u64 sme_me_mask;
29 extern u64 sev_status;
30
31 void sme_encrypt_execute(unsigned long encrypted_kernel_vaddr,
32 unsigned long decrypted_kernel_vaddr,
33 unsigned long kernel_len,
34 unsigned long encryption_wa,
35 unsigned long encryption_pgd);
36
37 void __init sme_early_encrypt(resource_size_t paddr,
38 unsigned long size);
39 void __init sme_early_decrypt(resource_size_t paddr,
40 unsigned long size);
41
42 void __init sme_map_bootdata(char *real_mode_data);
43 void __init sme_unmap_bootdata(char *real_mode_data);
44
45 void __init sme_early_init(void);
46 void __init sev_setup_arch(void);
47
48 void __init sme_encrypt_kernel(struct boot_params *bp);
49 void __init sme_enable(struct boot_params *bp);
50
51 int __init early_set_memory_decrypted(unsigned long vaddr, unsigned long size);
52 int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size);
53 void __init early_set_mem_enc_dec_hypercall(unsigned long vaddr,
54 unsigned long size, bool enc);
55
56 void __init mem_encrypt_free_decrypted_mem(void);
57
58 void __init sev_es_init_vc_handling(void);
59
60 #define __bss_decrypted __section(".bss..decrypted")
61
62 #else /* !CONFIG_AMD_MEM_ENCRYPT */
63
64 #define sme_me_mask 0ULL
65 #define sev_status 0ULL
66
sme_early_encrypt(resource_size_t paddr,unsigned long size)67 static inline void __init sme_early_encrypt(resource_size_t paddr,
68 unsigned long size) { }
sme_early_decrypt(resource_size_t paddr,unsigned long size)69 static inline void __init sme_early_decrypt(resource_size_t paddr,
70 unsigned long size) { }
71
sme_map_bootdata(char * real_mode_data)72 static inline void __init sme_map_bootdata(char *real_mode_data) { }
sme_unmap_bootdata(char * real_mode_data)73 static inline void __init sme_unmap_bootdata(char *real_mode_data) { }
74
sme_early_init(void)75 static inline void __init sme_early_init(void) { }
sev_setup_arch(void)76 static inline void __init sev_setup_arch(void) { }
77
sme_encrypt_kernel(struct boot_params * bp)78 static inline void __init sme_encrypt_kernel(struct boot_params *bp) { }
sme_enable(struct boot_params * bp)79 static inline void __init sme_enable(struct boot_params *bp) { }
80
sev_es_init_vc_handling(void)81 static inline void sev_es_init_vc_handling(void) { }
82
83 static inline int __init
early_set_memory_decrypted(unsigned long vaddr,unsigned long size)84 early_set_memory_decrypted(unsigned long vaddr, unsigned long size) { return 0; }
85 static inline int __init
early_set_memory_encrypted(unsigned long vaddr,unsigned long size)86 early_set_memory_encrypted(unsigned long vaddr, unsigned long size) { return 0; }
87 static inline void __init
early_set_mem_enc_dec_hypercall(unsigned long vaddr,unsigned long size,bool enc)88 early_set_mem_enc_dec_hypercall(unsigned long vaddr, unsigned long size, bool enc) {}
89
mem_encrypt_free_decrypted_mem(void)90 static inline void mem_encrypt_free_decrypted_mem(void) { }
91
92 #define __bss_decrypted
93
94 #endif /* CONFIG_AMD_MEM_ENCRYPT */
95
96 void add_encrypt_protection_map(void);
97
98 /*
99 * The __sme_pa() and __sme_pa_nodebug() macros are meant for use when
100 * writing to or comparing values from the cr3 register. Having the
101 * encryption mask set in cr3 enables the PGD entry to be encrypted and
102 * avoid special case handling of PGD allocations.
103 */
104 #define __sme_pa(x) (__pa(x) | sme_me_mask)
105 #define __sme_pa_nodebug(x) (__pa_nodebug(x) | sme_me_mask)
106
107 extern char __start_bss_decrypted[], __end_bss_decrypted[], __start_bss_decrypted_unused[];
108
sme_get_me_mask(void)109 static inline u64 sme_get_me_mask(void)
110 {
111 return sme_me_mask;
112 }
113
114 #endif /* __ASSEMBLY__ */
115
116 #endif /* __X86_MEM_ENCRYPT_H__ */
117
