531 lines
14 KiB
C
531 lines
14 KiB
C
/* 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 <linux/sev-guest.h>
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#include <asm/insn.h>
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#include <asm/sev-common.h>
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#include <asm/coco.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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struct boot_params;
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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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/* PVALIDATE return codes */
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#define PVALIDATE_FAIL_SIZEMISMATCH 6
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/* Software defined (when rFlags.CF = 1) */
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#define PVALIDATE_FAIL_NOUPDATE 255
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/* RMUPDATE detected 4K page and 2MB page overlap. */
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#define RMPUPDATE_FAIL_OVERLAP 4
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/* PSMASH failed due to concurrent access by another CPU */
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#define PSMASH_FAIL_INUSE 3
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/* RMP page size */
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#define RMP_PG_SIZE_4K 0
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#define RMP_PG_SIZE_2M 1
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#define RMP_TO_PG_LEVEL(level) (((level) == RMP_PG_SIZE_4K) ? PG_LEVEL_4K : PG_LEVEL_2M)
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#define PG_LEVEL_TO_RMP(level) (((level) == PG_LEVEL_4K) ? RMP_PG_SIZE_4K : RMP_PG_SIZE_2M)
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struct rmp_state {
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u64 gpa;
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u8 assigned;
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u8 pagesize;
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u8 immutable;
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u8 rsvd;
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u32 asid;
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} __packed;
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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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#define MAX_AUTHTAG_LEN 32
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#define AUTHTAG_LEN 16
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#define AAD_LEN 48
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#define MSG_HDR_VER 1
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/* See SNP spec SNP_GUEST_REQUEST section for the structure */
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enum msg_type {
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SNP_MSG_TYPE_INVALID = 0,
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SNP_MSG_CPUID_REQ,
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SNP_MSG_CPUID_RSP,
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SNP_MSG_KEY_REQ,
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SNP_MSG_KEY_RSP,
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SNP_MSG_REPORT_REQ,
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SNP_MSG_REPORT_RSP,
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SNP_MSG_EXPORT_REQ,
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SNP_MSG_EXPORT_RSP,
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SNP_MSG_IMPORT_REQ,
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SNP_MSG_IMPORT_RSP,
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SNP_MSG_ABSORB_REQ,
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SNP_MSG_ABSORB_RSP,
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SNP_MSG_VMRK_REQ,
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SNP_MSG_VMRK_RSP,
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SNP_MSG_TYPE_MAX
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};
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enum aead_algo {
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SNP_AEAD_INVALID,
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SNP_AEAD_AES_256_GCM,
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};
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struct snp_guest_msg_hdr {
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u8 authtag[MAX_AUTHTAG_LEN];
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u64 msg_seqno;
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u8 rsvd1[8];
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u8 algo;
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u8 hdr_version;
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u16 hdr_sz;
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u8 msg_type;
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u8 msg_version;
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u16 msg_sz;
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u32 rsvd2;
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u8 msg_vmpck;
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u8 rsvd3[35];
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} __packed;
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struct snp_guest_msg {
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struct snp_guest_msg_hdr hdr;
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u8 payload[PAGE_SIZE - sizeof(struct snp_guest_msg_hdr)];
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} __packed;
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struct sev_guest_platform_data {
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u64 secrets_gpa;
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};
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struct snp_guest_req {
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void *req_buf;
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size_t req_sz;
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void *resp_buf;
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size_t resp_sz;
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u64 exit_code;
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unsigned int vmpck_id;
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u8 msg_version;
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u8 msg_type;
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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 {
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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 vmsa_tweak_bitmap[64];
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/* SVSM fields */
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u64 svsm_base;
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u64 svsm_size;
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u64 svsm_caa;
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u32 svsm_max_version;
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u8 svsm_guest_vmpl;
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u8 rsvd3[3];
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/* Remainder of page */
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u8 rsvd4[3744];
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} __packed;
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struct snp_msg_desc {
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/* request and response are in unencrypted memory */
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struct snp_guest_msg *request, *response;
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/*
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* Avoid information leakage by double-buffering shared messages
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* in fields that are in regular encrypted memory.
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*/
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struct snp_guest_msg secret_request, secret_response;
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struct snp_secrets_page *secrets;
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struct snp_req_data input;
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void *certs_data;
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struct aesgcm_ctx *ctx;
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u32 *os_area_msg_seqno;
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u8 *vmpck;
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};
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/*
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* The SVSM Calling Area (CA) related structures.
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*/
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struct svsm_ca {
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u8 call_pending;
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u8 mem_available;
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u8 rsvd1[6];
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u8 svsm_buffer[PAGE_SIZE - 8];
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};
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#define SVSM_SUCCESS 0
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#define SVSM_ERR_INCOMPLETE 0x80000000
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#define SVSM_ERR_UNSUPPORTED_PROTOCOL 0x80000001
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#define SVSM_ERR_UNSUPPORTED_CALL 0x80000002
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#define SVSM_ERR_INVALID_ADDRESS 0x80000003
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#define SVSM_ERR_INVALID_FORMAT 0x80000004
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#define SVSM_ERR_INVALID_PARAMETER 0x80000005
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#define SVSM_ERR_INVALID_REQUEST 0x80000006
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#define SVSM_ERR_BUSY 0x80000007
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#define SVSM_PVALIDATE_FAIL_SIZEMISMATCH 0x80001006
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/*
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* The SVSM PVALIDATE related structures
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*/
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struct svsm_pvalidate_entry {
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u64 page_size : 2,
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action : 1,
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ignore_cf : 1,
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rsvd : 8,
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pfn : 52;
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};
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struct svsm_pvalidate_call {
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u16 num_entries;
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u16 cur_index;
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u8 rsvd1[4];
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struct svsm_pvalidate_entry entry[];
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};
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#define SVSM_PVALIDATE_MAX_COUNT ((sizeof_field(struct svsm_ca, svsm_buffer) - \
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offsetof(struct svsm_pvalidate_call, entry)) / \
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sizeof(struct svsm_pvalidate_entry))
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/*
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* The SVSM Attestation related structures
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*/
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struct svsm_loc_entry {
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u64 pa;
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u32 len;
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u8 rsvd[4];
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};
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struct svsm_attest_call {
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struct svsm_loc_entry report_buf;
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struct svsm_loc_entry nonce;
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struct svsm_loc_entry manifest_buf;
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struct svsm_loc_entry certificates_buf;
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/* For attesting a single service */
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u8 service_guid[16];
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u32 service_manifest_ver;
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u8 rsvd[4];
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};
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/* PTE descriptor used for the prepare_pte_enc() operations. */
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struct pte_enc_desc {
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pte_t *kpte;
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int pte_level;
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bool encrypt;
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/* pfn of the kpte above */
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unsigned long pfn;
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/* physical address of @pfn */
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unsigned long pa;
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/* virtual address of @pfn */
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void *va;
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/* memory covered by the pte */
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unsigned long size;
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pgprot_t new_pgprot;
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};
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/*
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* SVSM protocol structure
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*/
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struct svsm_call {
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struct svsm_ca *caa;
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u64 rax;
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u64 rcx;
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u64 rdx;
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u64 r8;
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u64 r9;
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u64 rax_out;
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u64 rcx_out;
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u64 rdx_out;
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u64 r8_out;
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u64 r9_out;
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};
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#define SVSM_CORE_CALL(x) ((0ULL << 32) | (x))
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#define SVSM_CORE_REMAP_CA 0
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#define SVSM_CORE_PVALIDATE 1
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#define SVSM_CORE_CREATE_VCPU 2
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#define SVSM_CORE_DELETE_VCPU 3
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#define SVSM_ATTEST_CALL(x) ((1ULL << 32) | (x))
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#define SVSM_ATTEST_SERVICES 0
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#define SVSM_ATTEST_SINGLE_SERVICE 1
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#ifdef CONFIG_AMD_MEM_ENCRYPT
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extern u8 snp_vmpl;
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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 (cc_vendor == CC_VENDOR_AMD &&
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cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT))
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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 (cc_vendor == CC_VENDOR_AMD &&
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cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT))
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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 (cc_vendor == CC_VENDOR_AMD &&
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cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT))
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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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extern void sev_enable(struct boot_params *bp);
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/*
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* RMPADJUST modifies the RMP permissions of a page of a lesser-
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* privileged (numerically higher) VMPL.
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*
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* If the guest is running at a higher-privilege than the privilege
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* level the instruction is targeting, the instruction will succeed,
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* otherwise, it will fail.
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*/
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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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struct snp_guest_request_ioctl;
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void setup_ghcb(void);
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void early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr,
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unsigned long npages);
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void early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr,
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unsigned long npages);
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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 __noreturn snp_abort(void);
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void snp_dmi_setup(void);
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int snp_issue_guest_request(struct snp_guest_req *req, struct snp_req_data *input,
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struct snp_guest_request_ioctl *rio);
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int snp_issue_svsm_attest_req(u64 call_id, struct svsm_call *call, struct svsm_attest_call *input);
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void snp_accept_memory(phys_addr_t start, phys_addr_t end);
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u64 snp_get_unsupported_features(u64 status);
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u64 sev_get_status(void);
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void sev_show_status(void);
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void snp_update_svsm_ca(void);
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int prepare_pte_enc(struct pte_enc_desc *d);
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void set_pte_enc_mask(pte_t *kpte, unsigned long pfn, pgprot_t new_prot);
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void snp_kexec_finish(void);
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void snp_kexec_begin(void);
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#else /* !CONFIG_AMD_MEM_ENCRYPT */
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#define snp_vmpl 0
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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 void sev_enable(struct boot_params *bp) { }
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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 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 void snp_dmi_setup(void) { }
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static inline int snp_issue_guest_request(struct snp_guest_req *req, struct snp_req_data *input,
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struct snp_guest_request_ioctl *rio)
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{
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return -ENOTTY;
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}
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static inline int snp_issue_svsm_attest_req(u64 call_id, struct svsm_call *call, struct svsm_attest_call *input)
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{
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return -ENOTTY;
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}
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static inline void snp_accept_memory(phys_addr_t start, phys_addr_t end) { }
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static inline u64 snp_get_unsupported_features(u64 status) { return 0; }
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static inline u64 sev_get_status(void) { return 0; }
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static inline void sev_show_status(void) { }
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static inline void snp_update_svsm_ca(void) { }
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static inline int prepare_pte_enc(struct pte_enc_desc *d) { return 0; }
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static inline void set_pte_enc_mask(pte_t *kpte, unsigned long pfn, pgprot_t new_prot) { }
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static inline void snp_kexec_finish(void) { }
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static inline void snp_kexec_begin(void) { }
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#endif /* CONFIG_AMD_MEM_ENCRYPT */
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#ifdef CONFIG_KVM_AMD_SEV
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bool snp_probe_rmptable_info(void);
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int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level);
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void snp_dump_hva_rmpentry(unsigned long address);
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int psmash(u64 pfn);
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int rmp_make_private(u64 pfn, u64 gpa, enum pg_level level, u32 asid, bool immutable);
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int rmp_make_shared(u64 pfn, enum pg_level level);
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void snp_leak_pages(u64 pfn, unsigned int npages);
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void kdump_sev_callback(void);
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void snp_fixup_e820_tables(void);
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#else
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static inline bool snp_probe_rmptable_info(void) { return false; }
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static inline int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level) { return -ENODEV; }
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static inline void snp_dump_hva_rmpentry(unsigned long address) {}
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static inline int psmash(u64 pfn) { return -ENODEV; }
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static inline int rmp_make_private(u64 pfn, u64 gpa, enum pg_level level, u32 asid,
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bool immutable)
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{
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return -ENODEV;
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}
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static inline int rmp_make_shared(u64 pfn, enum pg_level level) { return -ENODEV; }
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static inline void snp_leak_pages(u64 pfn, unsigned int npages) {}
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static inline void kdump_sev_callback(void) { }
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static inline void snp_fixup_e820_tables(void) {}
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#endif
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#endif
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