/* SPDX-License-Identifier: GPL-2.0 */ /* * AMD Encrypted Register State Support * * Author: Joerg Roedel <jroedel@suse.de> */ #ifndef __ASM_ENCRYPTED_STATE_H #define __ASM_ENCRYPTED_STATE_H #include <linux/types.h> #include <asm/insn.h> #include <asm/sev-common.h> #define GHCB_PROTO_OUR 0x0001UL #define GHCB_PROTOCOL_MAX 1ULL #define GHCB_DEFAULT_USAGE 0ULL #define VMGEXIT() { asm volatile("rep; vmmcall\n\r"); } enum es_result { ES_OK, /* All good */ ES_UNSUPPORTED, /* Requested operation not supported */ ES_VMM_ERROR, /* Unexpected state from the VMM */ ES_DECODE_FAILED, /* Instruction decoding failed */ ES_EXCEPTION, /* Instruction caused exception */ ES_RETRY, /* Retry instruction emulation */ }; struct es_fault_info { unsigned long vector; unsigned long error_code; unsigned long cr2; }; struct pt_regs; /* ES instruction emulation context */ struct es_em_ctxt { struct pt_regs *regs; struct insn insn; struct es_fault_info fi; }; void do_vc_no_ghcb(struct pt_regs *regs, unsigned long exit_code); static inline u64 lower_bits(u64 val, unsigned int bits) { u64 mask = (1ULL << bits) - 1; return (val & mask); } struct real_mode_header; enum stack_type; /* Early IDT entry points for #VC handler */ extern void vc_no_ghcb(void); extern void vc_boot_ghcb(void); extern bool handle_vc_boot_ghcb(struct pt_regs *regs); #ifdef CONFIG_AMD_MEM_ENCRYPT extern struct static_key_false sev_es_enable_key; extern void __sev_es_ist_enter(struct pt_regs *regs); extern void __sev_es_ist_exit(void); static __always_inline void sev_es_ist_enter(struct pt_regs *regs) { if (static_branch_unlikely(&sev_es_enable_key)) __sev_es_ist_enter(regs); } static __always_inline void sev_es_ist_exit(void) { if (static_branch_unlikely(&sev_es_enable_key)) __sev_es_ist_exit(); } extern int sev_es_setup_ap_jump_table(struct real_mode_header *rmh); extern void __sev_es_nmi_complete(void); static __always_inline void sev_es_nmi_complete(void) { if (static_branch_unlikely(&sev_es_enable_key)) __sev_es_nmi_complete(); } extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd); #else static inline void sev_es_ist_enter(struct pt_regs *regs) { } static inline void sev_es_ist_exit(void) { } static inline int sev_es_setup_ap_jump_table(struct real_mode_header *rmh) { return 0; } static inline void sev_es_nmi_complete(void) { } static inline int sev_es_efi_map_ghcbs(pgd_t *pgd) { return 0; } #endif #endif