arch/x86/include/asm/mem_encrypt.h

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