Tom Lendacky | 7744ccd | 2017-07-17 16:10:03 -0500 | [diff] [blame] | 1 | /* |
| 2 | * AMD Memory Encryption Support |
| 3 | * |
| 4 | * Copyright (C) 2016 Advanced Micro Devices, Inc. |
| 5 | * |
| 6 | * Author: Tom Lendacky <thomas.lendacky@amd.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | #ifndef __X86_MEM_ENCRYPT_H__ |
| 14 | #define __X86_MEM_ENCRYPT_H__ |
| 15 | |
| 16 | #ifndef __ASSEMBLY__ |
| 17 | |
Tom Lendacky | 5868f36 | 2017-07-17 16:10:05 -0500 | [diff] [blame] | 18 | #include <linux/init.h> |
| 19 | |
Tom Lendacky | aca20d5 | 2017-07-17 16:10:35 -0500 | [diff] [blame] | 20 | #include <asm/bootparam.h> |
| 21 | |
Tom Lendacky | 7744ccd | 2017-07-17 16:10:03 -0500 | [diff] [blame] | 22 | #ifdef CONFIG_AMD_MEM_ENCRYPT |
| 23 | |
Borislav Petkov | 21d9bb4 | 2017-09-07 11:38:37 +0200 | [diff] [blame] | 24 | extern u64 sme_me_mask; |
Tom Lendacky | 7744ccd | 2017-07-17 16:10:03 -0500 | [diff] [blame] | 25 | |
Tom Lendacky | 6ebcb06 | 2017-07-17 16:10:32 -0500 | [diff] [blame] | 26 | void sme_encrypt_execute(unsigned long encrypted_kernel_vaddr, |
| 27 | unsigned long decrypted_kernel_vaddr, |
| 28 | unsigned long kernel_len, |
| 29 | unsigned long encryption_wa, |
| 30 | unsigned long encryption_pgd); |
| 31 | |
Tom Lendacky | 7f8b7e7 | 2017-07-17 16:10:10 -0500 | [diff] [blame] | 32 | void __init sme_early_encrypt(resource_size_t paddr, |
| 33 | unsigned long size); |
| 34 | void __init sme_early_decrypt(resource_size_t paddr, |
| 35 | unsigned long size); |
| 36 | |
Tom Lendacky | b9d0520 | 2017-07-17 16:10:11 -0500 | [diff] [blame] | 37 | void __init sme_map_bootdata(char *real_mode_data); |
| 38 | void __init sme_unmap_bootdata(char *real_mode_data); |
| 39 | |
Tom Lendacky | 21729f8 | 2017-07-17 16:10:07 -0500 | [diff] [blame] | 40 | void __init sme_early_init(void); |
| 41 | |
Tom Lendacky | 5868f36 | 2017-07-17 16:10:05 -0500 | [diff] [blame] | 42 | void __init sme_encrypt_kernel(void); |
Tom Lendacky | aca20d5 | 2017-07-17 16:10:35 -0500 | [diff] [blame] | 43 | void __init sme_enable(struct boot_params *bp); |
Tom Lendacky | 5868f36 | 2017-07-17 16:10:05 -0500 | [diff] [blame] | 44 | |
Brijesh Singh | dfaaec9 | 2017-10-20 09:30:56 -0500 | [diff] [blame^] | 45 | int __init early_set_memory_decrypted(unsigned long vaddr, unsigned long size); |
| 46 | int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size); |
| 47 | |
Tom Lendacky | c775320 | 2017-07-17 16:10:21 -0500 | [diff] [blame] | 48 | /* Architecture __weak replacement functions */ |
| 49 | void __init mem_encrypt_init(void); |
| 50 | |
| 51 | void swiotlb_set_mem_attributes(void *vaddr, unsigned long size); |
| 52 | |
Tom Lendacky | d8aa7ee | 2017-10-20 09:30:44 -0500 | [diff] [blame] | 53 | bool sme_active(void); |
| 54 | bool sev_active(void); |
| 55 | |
Tom Lendacky | 7744ccd | 2017-07-17 16:10:03 -0500 | [diff] [blame] | 56 | #else /* !CONFIG_AMD_MEM_ENCRYPT */ |
| 57 | |
Borislav Petkov | 21d9bb4 | 2017-09-07 11:38:37 +0200 | [diff] [blame] | 58 | #define sme_me_mask 0ULL |
Tom Lendacky | 7744ccd | 2017-07-17 16:10:03 -0500 | [diff] [blame] | 59 | |
Tom Lendacky | 7f8b7e7 | 2017-07-17 16:10:10 -0500 | [diff] [blame] | 60 | static inline void __init sme_early_encrypt(resource_size_t paddr, |
| 61 | unsigned long size) { } |
| 62 | static inline void __init sme_early_decrypt(resource_size_t paddr, |
| 63 | unsigned long size) { } |
| 64 | |
Tom Lendacky | b9d0520 | 2017-07-17 16:10:11 -0500 | [diff] [blame] | 65 | static inline void __init sme_map_bootdata(char *real_mode_data) { } |
| 66 | static inline void __init sme_unmap_bootdata(char *real_mode_data) { } |
| 67 | |
Tom Lendacky | 21729f8 | 2017-07-17 16:10:07 -0500 | [diff] [blame] | 68 | static inline void __init sme_early_init(void) { } |
| 69 | |
Tom Lendacky | 5868f36 | 2017-07-17 16:10:05 -0500 | [diff] [blame] | 70 | static inline void __init sme_encrypt_kernel(void) { } |
Tom Lendacky | aca20d5 | 2017-07-17 16:10:35 -0500 | [diff] [blame] | 71 | static inline void __init sme_enable(struct boot_params *bp) { } |
Tom Lendacky | 5868f36 | 2017-07-17 16:10:05 -0500 | [diff] [blame] | 72 | |
Tom Lendacky | d8aa7ee | 2017-10-20 09:30:44 -0500 | [diff] [blame] | 73 | static inline bool sme_active(void) { return false; } |
| 74 | static inline bool sev_active(void) { return false; } |
| 75 | |
Brijesh Singh | dfaaec9 | 2017-10-20 09:30:56 -0500 | [diff] [blame^] | 76 | static inline int __init |
| 77 | early_set_memory_decrypted(unsigned long vaddr, unsigned long size) { return 0; } |
| 78 | static inline int __init |
| 79 | early_set_memory_encrypted(unsigned long vaddr, unsigned long size) { return 0; } |
| 80 | |
Tom Lendacky | 7744ccd | 2017-07-17 16:10:03 -0500 | [diff] [blame] | 81 | #endif /* CONFIG_AMD_MEM_ENCRYPT */ |
| 82 | |
Tom Lendacky | 21729f8 | 2017-07-17 16:10:07 -0500 | [diff] [blame] | 83 | /* |
| 84 | * The __sme_pa() and __sme_pa_nodebug() macros are meant for use when |
| 85 | * writing to or comparing values from the cr3 register. Having the |
| 86 | * encryption mask set in cr3 enables the PGD entry to be encrypted and |
| 87 | * avoid special case handling of PGD allocations. |
| 88 | */ |
| 89 | #define __sme_pa(x) (__pa(x) | sme_me_mask) |
| 90 | #define __sme_pa_nodebug(x) (__pa_nodebug(x) | sme_me_mask) |
| 91 | |
Tom Lendacky | 7744ccd | 2017-07-17 16:10:03 -0500 | [diff] [blame] | 92 | #endif /* __ASSEMBLY__ */ |
| 93 | |
| 94 | #endif /* __X86_MEM_ENCRYPT_H__ */ |