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- /* SPDX-License-Identifier: GPL-2.0 */
- /*
- * AMD Encrypted Register State Support
- *
- * Author: Joerg Roedel <[email protected]>
- */
- #ifndef __ASM_ENCRYPTED_STATE_H
- #define __ASM_ENCRYPTED_STATE_H
- #include <linux/types.h>
- #include <linux/sev-guest.h>
- #include <asm/insn.h>
- #include <asm/sev-common.h>
- #include <asm/bootparam.h>
- #define GHCB_PROTOCOL_MIN 1ULL
- #define GHCB_PROTOCOL_MAX 2ULL
- #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;
- };
- /*
- * AMD SEV Confidential computing blob structure. The structure is
- * defined in OVMF UEFI firmware header:
- * https://github.com/tianocore/edk2/blob/master/OvmfPkg/Include/Guid/ConfidentialComputingSevSnpBlob.h
- */
- #define CC_BLOB_SEV_HDR_MAGIC 0x45444d41
- struct cc_blob_sev_info {
- u32 magic;
- u16 version;
- u16 reserved;
- u64 secrets_phys;
- u32 secrets_len;
- u32 rsvd1;
- u64 cpuid_phys;
- u32 cpuid_len;
- u32 rsvd2;
- } __packed;
- 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);
- /* Software defined (when rFlags.CF = 1) */
- #define PVALIDATE_FAIL_NOUPDATE 255
- /* RMP page size */
- #define RMP_PG_SIZE_4K 0
- #define RMPADJUST_VMSA_PAGE_BIT BIT(16)
- /* SNP Guest message request */
- struct snp_req_data {
- unsigned long req_gpa;
- unsigned long resp_gpa;
- unsigned long data_gpa;
- unsigned int data_npages;
- };
- struct sev_guest_platform_data {
- u64 secrets_gpa;
- };
- /*
- * The secrets page contains 96-bytes of reserved field that can be used by
- * the guest OS. The guest OS uses the area to save the message sequence
- * number for each VMPCK.
- *
- * See the GHCB spec section Secret page layout for the format for this area.
- */
- struct secrets_os_area {
- u32 msg_seqno_0;
- u32 msg_seqno_1;
- u32 msg_seqno_2;
- u32 msg_seqno_3;
- u64 ap_jump_table_pa;
- u8 rsvd[40];
- u8 guest_usage[32];
- } __packed;
- #define VMPCK_KEY_LEN 32
- /* See the SNP spec version 0.9 for secrets page format */
- struct snp_secrets_page_layout {
- u32 version;
- u32 imien : 1,
- rsvd1 : 31;
- u32 fms;
- u32 rsvd2;
- u8 gosvw[16];
- u8 vmpck0[VMPCK_KEY_LEN];
- u8 vmpck1[VMPCK_KEY_LEN];
- u8 vmpck2[VMPCK_KEY_LEN];
- u8 vmpck3[VMPCK_KEY_LEN];
- struct secrets_os_area os_area;
- u8 rsvd3[3840];
- } __packed;
- #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);
- static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs)
- {
- int rc;
- /* "rmpadjust" mnemonic support in binutils 2.36 and newer */
- asm volatile(".byte 0xF3,0x0F,0x01,0xFE\n\t"
- : "=a"(rc)
- : "a"(vaddr), "c"(rmp_psize), "d"(attrs)
- : "memory", "cc");
- return rc;
- }
- static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate)
- {
- bool no_rmpupdate;
- int rc;
- /* "pvalidate" mnemonic support in binutils 2.36 and newer */
- asm volatile(".byte 0xF2, 0x0F, 0x01, 0xFF\n\t"
- CC_SET(c)
- : CC_OUT(c) (no_rmpupdate), "=a"(rc)
- : "a"(vaddr), "c"(rmp_psize), "d"(validate)
- : "memory", "cc");
- if (no_rmpupdate)
- return PVALIDATE_FAIL_NOUPDATE;
- return rc;
- }
- struct snp_guest_request_ioctl;
- void setup_ghcb(void);
- void __init early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr,
- unsigned long npages);
- void __init early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr,
- unsigned long npages);
- void __init snp_prep_memory(unsigned long paddr, unsigned int sz, enum psc_op op);
- void snp_set_memory_shared(unsigned long vaddr, unsigned long npages);
- void snp_set_memory_private(unsigned long vaddr, unsigned long npages);
- void snp_set_wakeup_secondary_cpu(void);
- bool snp_init(struct boot_params *bp);
- void __init __noreturn snp_abort(void);
- int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, struct snp_guest_request_ioctl *rio);
- #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; }
- static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate) { return 0; }
- static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs) { return 0; }
- static inline void setup_ghcb(void) { }
- static inline void __init
- early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, unsigned long npages) { }
- static inline void __init
- early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, unsigned long npages) { }
- static inline void __init snp_prep_memory(unsigned long paddr, unsigned int sz, enum psc_op op) { }
- static inline void snp_set_memory_shared(unsigned long vaddr, unsigned long npages) { }
- static inline void snp_set_memory_private(unsigned long vaddr, unsigned long npages) { }
- static inline void snp_set_wakeup_secondary_cpu(void) { }
- static inline bool snp_init(struct boot_params *bp) { return false; }
- static inline void snp_abort(void) { }
- static inline int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, struct snp_guest_request_ioctl *rio)
- {
- return -ENOTTY;
- }
- #endif
- #endif
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