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 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 67 static inline void __init sme_early_encrypt(resource_size_t paddr, 68 unsigned long size) { } 69 static inline void __init sme_early_decrypt(resource_size_t paddr, 70 unsigned long size) { } 71 72 static inline void __init sme_map_bootdata(char *real_mode_data) { } 73 static inline void __init sme_unmap_bootdata(char *real_mode_data) { } 74 75 static inline void __init sme_early_init(void) { } 76 static inline void __init sev_setup_arch(void) { } 77 78 static inline void __init sme_encrypt_kernel(struct boot_params *bp) { } 79 static inline void __init sme_enable(struct boot_params *bp) { } 80 81 static inline void sev_es_init_vc_handling(void) { } 82 83 static inline int __init 84 early_set_memory_decrypted(unsigned long vaddr, unsigned long size) { return 0; } 85 static inline int __init 86 early_set_memory_encrypted(unsigned long vaddr, unsigned long size) { return 0; } 87 static inline void __init 88 early_set_mem_enc_dec_hypercall(unsigned long vaddr, unsigned long size, bool enc) {} 89 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[]; 108 109 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