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 u64 sev_status; 23 extern bool sev_enabled; 24 25 void sme_encrypt_execute(unsigned long encrypted_kernel_vaddr, 26 unsigned long decrypted_kernel_vaddr, 27 unsigned long kernel_len, 28 unsigned long encryption_wa, 29 unsigned long encryption_pgd); 30 31 void __init sme_early_encrypt(resource_size_t paddr, 32 unsigned long size); 33 void __init sme_early_decrypt(resource_size_t paddr, 34 unsigned long size); 35 36 void __init sme_map_bootdata(char *real_mode_data); 37 void __init sme_unmap_bootdata(char *real_mode_data); 38 39 void __init sme_early_init(void); 40 41 void __init sme_encrypt_kernel(struct boot_params *bp); 42 void __init sme_enable(struct boot_params *bp); 43 44 int __init early_set_memory_decrypted(unsigned long vaddr, unsigned long size); 45 int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size); 46 47 void __init mem_encrypt_free_decrypted_mem(void); 48 49 /* Architecture __weak replacement functions */ 50 void __init mem_encrypt_init(void); 51 52 void __init sev_es_init_vc_handling(void); 53 bool sme_active(void); 54 bool sev_active(void); 55 bool sev_es_active(void); 56 57 #define __bss_decrypted __section(".bss..decrypted") 58 59 #else /* !CONFIG_AMD_MEM_ENCRYPT */ 60 61 #define sme_me_mask 0ULL 62 63 static inline void __init sme_early_encrypt(resource_size_t paddr, 64 unsigned long size) { } 65 static inline void __init sme_early_decrypt(resource_size_t paddr, 66 unsigned long size) { } 67 68 static inline void __init sme_map_bootdata(char *real_mode_data) { } 69 static inline void __init sme_unmap_bootdata(char *real_mode_data) { } 70 71 static inline void __init sme_early_init(void) { } 72 73 static inline void __init sme_encrypt_kernel(struct boot_params *bp) { } 74 static inline void __init sme_enable(struct boot_params *bp) { } 75 76 static inline void sev_es_init_vc_handling(void) { } 77 static inline bool sme_active(void) { return false; } 78 static inline bool sev_active(void) { return false; } 79 static inline bool sev_es_active(void) { return false; } 80 81 static inline int __init 82 early_set_memory_decrypted(unsigned long vaddr, unsigned long size) { return 0; } 83 static inline int __init 84 early_set_memory_encrypted(unsigned long vaddr, unsigned long size) { return 0; } 85 86 static inline void mem_encrypt_free_decrypted_mem(void) { } 87 88 #define __bss_decrypted 89 90 #endif /* CONFIG_AMD_MEM_ENCRYPT */ 91 92 /* 93 * The __sme_pa() and __sme_pa_nodebug() macros are meant for use when 94 * writing to or comparing values from the cr3 register. Having the 95 * encryption mask set in cr3 enables the PGD entry to be encrypted and 96 * avoid special case handling of PGD allocations. 97 */ 98 #define __sme_pa(x) (__pa(x) | sme_me_mask) 99 #define __sme_pa_nodebug(x) (__pa_nodebug(x) | sme_me_mask) 100 101 extern char __start_bss_decrypted[], __end_bss_decrypted[], __start_bss_decrypted_unused[]; 102 103 static inline bool mem_encrypt_active(void) 104 { 105 return sme_me_mask; 106 } 107 108 static inline u64 sme_get_me_mask(void) 109 { 110 return sme_me_mask; 111 } 112 113 #endif /* __ASSEMBLY__ */ 114 115 #endif /* __X86_MEM_ENCRYPT_H__ */ 116