| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 | |
| 17 | #include <asm/bootparam.h> |
| 18 | |
| 19 | #ifdef CONFIG_AMD_MEM_ENCRYPT |
| 20 | |
| 21 | extern u64 sme_me_mask; |
| 22 | extern bool sev_enabled; |
| 23 | |
| 24 | void sme_encrypt_execute(unsigned long encrypted_kernel_vaddr, |
| 25 | unsigned long decrypted_kernel_vaddr, |
| 26 | unsigned long kernel_len, |
| 27 | unsigned long encryption_wa, |
| 28 | unsigned long encryption_pgd); |
| 29 | |
| 30 | void __init sme_early_encrypt(resource_size_t paddr, |
| 31 | unsigned long size); |
| 32 | void __init sme_early_decrypt(resource_size_t paddr, |
| 33 | unsigned long size); |
| 34 | |
| 35 | void __init sme_map_bootdata(char *real_mode_data); |
| 36 | void __init sme_unmap_bootdata(char *real_mode_data); |
| 37 | |
| 38 | void __init sme_early_init(void); |
| 39 | |
| 40 | void __init sme_encrypt_kernel(struct boot_params *bp); |
| 41 | void __init sme_enable(struct boot_params *bp); |
| 42 | |
| 43 | int __init early_set_memory_decrypted(unsigned long vaddr, unsigned long size); |
| 44 | int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size); |
| 45 | |
| 46 | /* Architecture __weak replacement functions */ |
| 47 | void __init mem_encrypt_init(void); |
| 48 | void __init mem_encrypt_free_decrypted_mem(void); |
| 49 | |
| 50 | bool sme_active(void); |
| 51 | bool sev_active(void); |
| 52 | |
| 53 | #define __bss_decrypted __attribute__((__section__(".bss..decrypted"))) |
| 54 | |
| 55 | #else /* !CONFIG_AMD_MEM_ENCRYPT */ |
| 56 | |
| 57 | #define sme_me_mask 0ULL |
| 58 | |
| 59 | static inline void __init sme_early_encrypt(resource_size_t paddr, |
| 60 | unsigned long size) { } |
| 61 | static inline void __init sme_early_decrypt(resource_size_t paddr, |
| 62 | unsigned long size) { } |
| 63 | |
| 64 | static inline void __init sme_map_bootdata(char *real_mode_data) { } |
| 65 | static inline void __init sme_unmap_bootdata(char *real_mode_data) { } |
| 66 | |
| 67 | static inline void __init sme_early_init(void) { } |
| 68 | |
| 69 | static inline void __init sme_encrypt_kernel(struct boot_params *bp) { } |
| 70 | static inline void __init sme_enable(struct boot_params *bp) { } |
| 71 | |
| 72 | static inline bool sme_active(void) { return false; } |
| 73 | static inline bool sev_active(void) { return false; } |
| 74 | |
| 75 | static inline int __init |
| 76 | early_set_memory_decrypted(unsigned long vaddr, unsigned long size) { return 0; } |
| 77 | static inline int __init |
| 78 | early_set_memory_encrypted(unsigned long vaddr, unsigned long size) { return 0; } |
| 79 | |
| 80 | static inline void mem_encrypt_init(void) { } |
| 81 | |
| 82 | #define __bss_decrypted |
| 83 | |
| 84 | #endif /* CONFIG_AMD_MEM_ENCRYPT */ |
| 85 | |
| 86 | /* |
| 87 | * The __sme_pa() and __sme_pa_nodebug() macros are meant for use when |
| 88 | * writing to or comparing values from the cr3 register. Having the |
| 89 | * encryption mask set in cr3 enables the PGD entry to be encrypted and |
| 90 | * avoid special case handling of PGD allocations. |
| 91 | */ |
| 92 | #define __sme_pa(x) (__pa(x) | sme_me_mask) |
| 93 | #define __sme_pa_nodebug(x) (__pa_nodebug(x) | sme_me_mask) |
| 94 | |
| 95 | extern char __start_bss_decrypted[], __end_bss_decrypted[], __start_bss_decrypted_unused[]; |
| 96 | |
| 97 | static inline bool mem_encrypt_active(void) |
| 98 | { |
| 99 | return sme_me_mask; |
| 100 | } |
| 101 | |
| 102 | static inline u64 sme_get_me_mask(void) |
| 103 | { |
| 104 | return sme_me_mask; |
| 105 | } |
| 106 | |
| 107 | #endif /* __ASSEMBLY__ */ |
| 108 | |
| 109 | #endif /* __X86_MEM_ENCRYPT_H__ */ |