mem_encrypt.h (3322B)
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_AMD_MEM_ENCRYPT 21 22extern u64 sme_me_mask; 23extern u64 sev_status; 24 25void 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 31void __init sme_early_encrypt(resource_size_t paddr, 32 unsigned long size); 33void __init sme_early_decrypt(resource_size_t paddr, 34 unsigned long size); 35 36void __init sme_map_bootdata(char *real_mode_data); 37void __init sme_unmap_bootdata(char *real_mode_data); 38 39void __init sme_early_init(void); 40void __init sev_setup_arch(void); 41 42void __init sme_encrypt_kernel(struct boot_params *bp); 43void __init sme_enable(struct boot_params *bp); 44 45int __init early_set_memory_decrypted(unsigned long vaddr, unsigned long size); 46int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size); 47void __init early_set_mem_enc_dec_hypercall(unsigned long vaddr, int npages, 48 bool enc); 49 50void __init mem_encrypt_free_decrypted_mem(void); 51 52void __init sev_es_init_vc_handling(void); 53 54#define __bss_decrypted __section(".bss..decrypted") 55 56#else /* !CONFIG_AMD_MEM_ENCRYPT */ 57 58#define sme_me_mask 0ULL 59 60static inline void __init sme_early_encrypt(resource_size_t paddr, 61 unsigned long size) { } 62static inline void __init sme_early_decrypt(resource_size_t paddr, 63 unsigned long size) { } 64 65static inline void __init sme_map_bootdata(char *real_mode_data) { } 66static inline void __init sme_unmap_bootdata(char *real_mode_data) { } 67 68static inline void __init sme_early_init(void) { } 69static inline void __init sev_setup_arch(void) { } 70 71static inline void __init sme_encrypt_kernel(struct boot_params *bp) { } 72static inline void __init sme_enable(struct boot_params *bp) { } 73 74static inline void sev_es_init_vc_handling(void) { } 75 76static inline int __init 77early_set_memory_decrypted(unsigned long vaddr, unsigned long size) { return 0; } 78static inline int __init 79early_set_memory_encrypted(unsigned long vaddr, unsigned long size) { return 0; } 80static inline void __init 81early_set_mem_enc_dec_hypercall(unsigned long vaddr, int npages, bool enc) {} 82 83static inline void mem_encrypt_free_decrypted_mem(void) { } 84 85#define __bss_decrypted 86 87#endif /* CONFIG_AMD_MEM_ENCRYPT */ 88 89/* Architecture __weak replacement functions */ 90void __init mem_encrypt_init(void); 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 101extern char __start_bss_decrypted[], __end_bss_decrypted[], __start_bss_decrypted_unused[]; 102 103static inline u64 sme_get_me_mask(void) 104{ 105 return sme_me_mask; 106} 107 108#endif /* __ASSEMBLY__ */ 109 110#endif /* __X86_MEM_ENCRYPT_H__ */