227 lines
6.4 KiB
C
227 lines
6.4 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* AMD Encrypted Register State Support
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*
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* Author: Joerg Roedel <jroedel@suse.de>
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*/
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#ifndef __ASM_ENCRYPTED_STATE_H
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#define __ASM_ENCRYPTED_STATE_H
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#include <linux/types.h>
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#include <asm/insn.h>
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#include <asm/sev-common.h>
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#include <asm/bootparam.h>
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#define GHCB_PROTOCOL_MIN 1ULL
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#define GHCB_PROTOCOL_MAX 2ULL
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#define GHCB_DEFAULT_USAGE 0ULL
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#define VMGEXIT() { asm volatile("rep; vmmcall\n\r"); }
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enum es_result {
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ES_OK, /* All good */
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ES_UNSUPPORTED, /* Requested operation not supported */
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ES_VMM_ERROR, /* Unexpected state from the VMM */
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ES_DECODE_FAILED, /* Instruction decoding failed */
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ES_EXCEPTION, /* Instruction caused exception */
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ES_RETRY, /* Retry instruction emulation */
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};
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struct es_fault_info {
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unsigned long vector;
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unsigned long error_code;
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unsigned long cr2;
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};
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struct pt_regs;
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/* ES instruction emulation context */
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struct es_em_ctxt {
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struct pt_regs *regs;
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struct insn insn;
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struct es_fault_info fi;
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};
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/*
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* AMD SEV Confidential computing blob structure. The structure is
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* defined in OVMF UEFI firmware header:
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* https://github.com/tianocore/edk2/blob/master/OvmfPkg/Include/Guid/ConfidentialComputingSevSnpBlob.h
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*/
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#define CC_BLOB_SEV_HDR_MAGIC 0x45444d41
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struct cc_blob_sev_info {
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u32 magic;
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u16 version;
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u16 reserved;
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u64 secrets_phys;
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u32 secrets_len;
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u32 rsvd1;
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u64 cpuid_phys;
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u32 cpuid_len;
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u32 rsvd2;
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} __packed;
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void do_vc_no_ghcb(struct pt_regs *regs, unsigned long exit_code);
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static inline u64 lower_bits(u64 val, unsigned int bits)
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{
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u64 mask = (1ULL << bits) - 1;
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return (val & mask);
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}
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struct real_mode_header;
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enum stack_type;
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/* Early IDT entry points for #VC handler */
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extern void vc_no_ghcb(void);
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extern void vc_boot_ghcb(void);
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extern bool handle_vc_boot_ghcb(struct pt_regs *regs);
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/* Software defined (when rFlags.CF = 1) */
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#define PVALIDATE_FAIL_NOUPDATE 255
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/* RMP page size */
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#define RMP_PG_SIZE_4K 0
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#define RMPADJUST_VMSA_PAGE_BIT BIT(16)
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/* SNP Guest message request */
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struct snp_req_data {
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unsigned long req_gpa;
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unsigned long resp_gpa;
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unsigned long data_gpa;
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unsigned int data_npages;
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};
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struct sev_guest_platform_data {
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u64 secrets_gpa;
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};
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/*
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* The secrets page contains 96-bytes of reserved field that can be used by
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* the guest OS. The guest OS uses the area to save the message sequence
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* number for each VMPCK.
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*
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* See the GHCB spec section Secret page layout for the format for this area.
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*/
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struct secrets_os_area {
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u32 msg_seqno_0;
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u32 msg_seqno_1;
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u32 msg_seqno_2;
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u32 msg_seqno_3;
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u64 ap_jump_table_pa;
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u8 rsvd[40];
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u8 guest_usage[32];
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} __packed;
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#define VMPCK_KEY_LEN 32
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/* See the SNP spec version 0.9 for secrets page format */
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struct snp_secrets_page_layout {
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u32 version;
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u32 imien : 1,
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rsvd1 : 31;
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u32 fms;
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u32 rsvd2;
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u8 gosvw[16];
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u8 vmpck0[VMPCK_KEY_LEN];
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u8 vmpck1[VMPCK_KEY_LEN];
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u8 vmpck2[VMPCK_KEY_LEN];
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u8 vmpck3[VMPCK_KEY_LEN];
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struct secrets_os_area os_area;
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u8 rsvd3[3840];
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} __packed;
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#ifdef CONFIG_AMD_MEM_ENCRYPT
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extern struct static_key_false sev_es_enable_key;
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extern void __sev_es_ist_enter(struct pt_regs *regs);
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extern void __sev_es_ist_exit(void);
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static __always_inline void sev_es_ist_enter(struct pt_regs *regs)
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{
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if (static_branch_unlikely(&sev_es_enable_key))
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__sev_es_ist_enter(regs);
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}
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static __always_inline void sev_es_ist_exit(void)
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{
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if (static_branch_unlikely(&sev_es_enable_key))
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__sev_es_ist_exit();
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}
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extern int sev_es_setup_ap_jump_table(struct real_mode_header *rmh);
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extern void __sev_es_nmi_complete(void);
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static __always_inline void sev_es_nmi_complete(void)
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{
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if (static_branch_unlikely(&sev_es_enable_key))
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__sev_es_nmi_complete();
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}
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extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd);
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static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs)
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{
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int rc;
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/* "rmpadjust" mnemonic support in binutils 2.36 and newer */
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asm volatile(".byte 0xF3,0x0F,0x01,0xFE\n\t"
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: "=a"(rc)
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: "a"(vaddr), "c"(rmp_psize), "d"(attrs)
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: "memory", "cc");
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return rc;
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}
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static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate)
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{
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bool no_rmpupdate;
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int rc;
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/* "pvalidate" mnemonic support in binutils 2.36 and newer */
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asm volatile(".byte 0xF2, 0x0F, 0x01, 0xFF\n\t"
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CC_SET(c)
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: CC_OUT(c) (no_rmpupdate), "=a"(rc)
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: "a"(vaddr), "c"(rmp_psize), "d"(validate)
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: "memory", "cc");
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if (no_rmpupdate)
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return PVALIDATE_FAIL_NOUPDATE;
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return rc;
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}
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void setup_ghcb(void);
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void __init early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr,
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unsigned long npages);
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void __init early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr,
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unsigned long npages);
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void __init snp_prep_memory(unsigned long paddr, unsigned int sz, enum psc_op op);
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void snp_set_memory_shared(unsigned long vaddr, unsigned long npages);
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void snp_set_memory_private(unsigned long vaddr, unsigned long npages);
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void snp_set_wakeup_secondary_cpu(void);
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bool snp_init(struct boot_params *bp);
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void __init __noreturn snp_abort(void);
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int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, unsigned long *fw_err);
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#else
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static inline void sev_es_ist_enter(struct pt_regs *regs) { }
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static inline void sev_es_ist_exit(void) { }
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static inline int sev_es_setup_ap_jump_table(struct real_mode_header *rmh) { return 0; }
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static inline void sev_es_nmi_complete(void) { }
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static inline int sev_es_efi_map_ghcbs(pgd_t *pgd) { return 0; }
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static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate) { return 0; }
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static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs) { return 0; }
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static inline void setup_ghcb(void) { }
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static inline void __init
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early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, unsigned long npages) { }
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static inline void __init
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early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, unsigned long npages) { }
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static inline void __init snp_prep_memory(unsigned long paddr, unsigned int sz, enum psc_op op) { }
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static inline void snp_set_memory_shared(unsigned long vaddr, unsigned long npages) { }
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static inline void snp_set_memory_private(unsigned long vaddr, unsigned long npages) { }
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static inline void snp_set_wakeup_secondary_cpu(void) { }
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static inline bool snp_init(struct boot_params *bp) { return false; }
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static inline void snp_abort(void) { }
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static inline int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input,
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unsigned long *fw_err)
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{
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return -ENOTTY;
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}
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#endif
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#endif
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