diff options
Diffstat (limited to 'arch/x86/include/asm/sev-es.h')
| -rw-r--r-- | arch/x86/include/asm/sev-es.h | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/arch/x86/include/asm/sev-es.h b/arch/x86/include/asm/sev-es.h new file mode 100644 index 000000000000..cf1d957c7091 --- /dev/null +++ b/arch/x86/include/asm/sev-es.h @@ -0,0 +1,114 @@ +/* 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> + +#define GHCB_SEV_INFO 0x001UL +#define GHCB_SEV_INFO_REQ 0x002UL +#define GHCB_INFO(v) ((v) & 0xfffUL) +#define GHCB_PROTO_MAX(v) (((v) >> 48) & 0xffffUL) +#define GHCB_PROTO_MIN(v) (((v) >> 32) & 0xffffUL) +#define GHCB_PROTO_OUR 0x0001UL +#define GHCB_SEV_CPUID_REQ 0x004UL +#define GHCB_CPUID_REQ_EAX 0 +#define GHCB_CPUID_REQ_EBX 1 +#define GHCB_CPUID_REQ_ECX 2 +#define GHCB_CPUID_REQ_EDX 3 +#define GHCB_CPUID_REQ(fn, reg) (GHCB_SEV_CPUID_REQ | \ + (((unsigned long)reg & 3) << 30) | \ + (((unsigned long)fn) << 32)) + +#define GHCB_PROTOCOL_MAX 0x0001UL +#define GHCB_DEFAULT_USAGE 0x0000UL + +#define GHCB_SEV_CPUID_RESP 0x005UL +#define GHCB_SEV_TERMINATE 0x100UL +#define GHCB_SEV_TERMINATE_REASON(reason_set, reason_val) \ + (((((u64)reason_set) & 0x7) << 12) | \ + ((((u64)reason_val) & 0xff) << 16)) +#define GHCB_SEV_ES_REASON_GENERAL_REQUEST 0 +#define GHCB_SEV_ES_REASON_PROTOCOL_UNSUPPORTED 1 + +#define GHCB_SEV_GHCB_RESP_CODE(v) ((v) & 0xfff) +#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 |