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usr
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src
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linux-headers-6.8.0-83-generic
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arch
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x86
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include
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asm
/ [
drwxr-xr-x
]
upload
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sev.h
/* 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 <linux/sev-guest.h> #include <asm/insn.h> #include <asm/sev-common.h> #include <asm/bootparam.h> #include <asm/coco.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); /* PVALIDATE return codes */ #define PVALIDATE_FAIL_SIZEMISMATCH 6 /* Software defined (when rFlags.CF = 1) */ #define PVALIDATE_FAIL_NOUPDATE 255 /* RMP page size */ #define RMP_PG_SIZE_4K 0 #define RMP_PG_SIZE_2M 1 #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 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 (cc_vendor == CC_VENDOR_AMD && cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT)) __sev_es_ist_enter(regs); } static __always_inline void sev_es_ist_exit(void) { if (cc_vendor == CC_VENDOR_AMD && cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT)) __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 (cc_vendor == CC_VENDOR_AMD && cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT)) __sev_es_nmi_complete(); } extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd); extern void sev_enable(struct boot_params *bp); 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 early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, unsigned long npages); void early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, unsigned long npages); 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 __noreturn snp_abort(void); void snp_dmi_setup(void); int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, struct snp_guest_request_ioctl *rio); void snp_accept_memory(phys_addr_t start, phys_addr_t end); u64 snp_get_unsupported_features(u64 status); u64 sev_get_status(void); #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 void sev_enable(struct boot_params *bp) { } 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 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 void snp_dmi_setup(void) { } static inline int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, struct snp_guest_request_ioctl *rio) { return -ENOTTY; } static inline void snp_accept_memory(phys_addr_t start, phys_addr_t end) { } static inline u64 snp_get_unsupported_features(u64 status) { return 0; } static inline u64 sev_get_status(void) { return 0; } #endif #endif
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