arch/x86/include/asm/sev-es.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * AMD Encrypted Register State Support
   4  *
   5  * Author: Joerg Roedel <jroedel@suse.de>
   6  */
   7
   8 #ifndef __ASM_ENCRYPTED_STATE_H
   9 #define __ASM_ENCRYPTED_STATE_H
  10
  11 #include <linux/types.h>
  12 #include <asm/insn.h>
  13
  14 #define GHCB_SEV_INFO           0x001UL
  15 #define GHCB_SEV_INFO_REQ       0x002UL
  16 #define         GHCB_INFO(v)            ((v) & 0xfffUL)
  17 #define         GHCB_PROTO_MAX(v)       (((v) >> 48) & 0xffffUL)
  18 #define         GHCB_PROTO_MIN(v)       (((v) >> 32) & 0xffffUL)
  19 #define         GHCB_PROTO_OUR          0x0001UL
  20 #define GHCB_SEV_CPUID_REQ      0x004UL
  21 #define         GHCB_CPUID_REQ_EAX      0
  22 #define         GHCB_CPUID_REQ_EBX      1
  23 #define         GHCB_CPUID_REQ_ECX      2
  24 #define         GHCB_CPUID_REQ_EDX      3
  25 #define         GHCB_CPUID_REQ(fn, reg) (GHCB_SEV_CPUID_REQ | \
  26                                         (((unsigned long)reg & 3) << 30) | \
  27                                         (((unsigned long)fn) << 32))
  28
  29 #define GHCB_PROTOCOL_MAX       0x0001UL
  30 #define GHCB_DEFAULT_USAGE      0x0000UL
  31
  32 #define GHCB_SEV_CPUID_RESP     0x005UL
  33 #define GHCB_SEV_TERMINATE      0x100UL
  34 #define         GHCB_SEV_TERMINATE_REASON(reason_set, reason_val)       \
  35                         (((((u64)reason_set) &  0x7) << 12) |           \
  36                          ((((u64)reason_val) & 0xff) << 16))
  37 #define         GHCB_SEV_ES_REASON_GENERAL_REQUEST      0
  38 #define         GHCB_SEV_ES_REASON_PROTOCOL_UNSUPPORTED 1
  39
  40 #define GHCB_SEV_GHCB_RESP_CODE(v)      ((v) & 0xfff)
  41 #define VMGEXIT()                       { asm volatile("rep; vmmcall\n\r"); }
  42
  43 enum es_result {
  44         ES_OK,                  /* All good */
  45         ES_UNSUPPORTED,         /* Requested operation not supported */
  46         ES_VMM_ERROR,           /* Unexpected state from the VMM */
  47         ES_DECODE_FAILED,       /* Instruction decoding failed */
  48         ES_EXCEPTION,           /* Instruction caused exception */
  49         ES_RETRY,               /* Retry instruction emulation */
  50 };
  51
  52 struct es_fault_info {
  53         unsigned long vector;
  54         unsigned long error_code;
  55         unsigned long cr2;
  56 };
  57
  58 struct pt_regs;
  59
  60 /* ES instruction emulation context */
  61 struct es_em_ctxt {
  62         struct pt_regs *regs;
  63         struct insn insn;
  64         struct es_fault_info fi;
  65 };
  66
  67 void do_vc_no_ghcb(struct pt_regs *regs, unsigned long exit_code);
  68
  69 static inline u64 lower_bits(u64 val, unsigned int bits)
  70 {
  71         u64 mask = (1ULL << bits) - 1;
  72
  73         return (val & mask);
  74 }
  75
  76 struct real_mode_header;
  77 enum stack_type;
  78
  79 /* Early IDT entry points for #VC handler */
  80 extern void vc_no_ghcb(void);
  81 extern void vc_boot_ghcb(void);
  82 extern bool handle_vc_boot_ghcb(struct pt_regs *regs);
  83
  84 #ifdef CONFIG_AMD_MEM_ENCRYPT
  85 extern struct static_key_false sev_es_enable_key;
  86 extern void __sev_es_ist_enter(struct pt_regs *regs);
  87 extern void __sev_es_ist_exit(void);
  88 static __always_inline void sev_es_ist_enter(struct pt_regs *regs)
  89 {
  90         if (static_branch_unlikely(&sev_es_enable_key))
  91                 __sev_es_ist_enter(regs);
  92 }
  93 static __always_inline void sev_es_ist_exit(void)
  94 {
  95         if (static_branch_unlikely(&sev_es_enable_key))
  96                 __sev_es_ist_exit();
  97 }
  98 extern int sev_es_setup_ap_jump_table(struct real_mode_header *rmh);
  99 extern void __sev_es_nmi_complete(void);
 100 static __always_inline void sev_es_nmi_complete(void)
 101 {
 102         if (static_branch_unlikely(&sev_es_enable_key))
 103                 __sev_es_nmi_complete();
 104 }
 105 extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd);
 106 #else
 107 static inline void sev_es_ist_enter(struct pt_regs *regs) { }
 108 static inline void sev_es_ist_exit(void) { }
 109 static inline int sev_es_setup_ap_jump_table(struct real_mode_header *rmh) { return 0; }
 110 static inline void sev_es_nmi_complete(void) { }
 111 static inline int sev_es_efi_map_ghcbs(pgd_t *pgd) { return 0; }
 112 #endif
 113
 114 #endif