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The SEV-SNP specification provides the guest a mechanism to communicate with the PSP without risk from a malicious hypervisor who wishes to read, alter, drop or replay the messages sent. The driver uses snp_issue_guest_request() to issue GHCB SNP_GUEST_REQUEST or SNP_EXT_GUEST_REQUEST NAE events to submit the request to PSP. The PSP requires that all communication should be encrypted using key specified through a struct snp_guest_platform_data descriptor. Userspace can use SNP_GET_REPORT ioctl() to query the guest attestation report. See SEV-SNP spec section Guest Messages for more details. [ bp: Remove the "what" from the commit message, massage. ] Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lore.kernel.org/r/20220307213356.2797205-44-brijesh.singh@amd.com
99 lines
1.9 KiB
C
99 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2021 Advanced Micro Devices, Inc.
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*
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* Author: Brijesh Singh <brijesh.singh@amd.com>
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*
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* SEV-SNP API spec is available at https://developer.amd.com/sev
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*/
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#ifndef __VIRT_SEVGUEST_H__
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#define __VIRT_SEVGUEST_H__
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#include <linux/types.h>
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#define MAX_AUTHTAG_LEN 32
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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[4000];
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} __packed;
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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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#endif /* __VIRT_SEVGUEST_H__ */
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