x86/sev: Move sev_guest.h into common SEV header

sev_guest.h currently contains various definitions relating to the
format of SNP_GUEST_REQUEST commands to SNP firmware. Currently only the
sev-guest driver makes use of them, but when the KVM side of this is
implemented there's a need to parse the SNP_GUEST_REQUEST header to
determine whether additional information needs to be provided to the
guest. Prepare for this by moving those definitions to a common header
that's shared by host/guest code so that KVM can also make use of them.
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>
Message-ID: <20240701223148.3798365-3-michael.roth@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/include/asm/sev.h

@@ -119,6 +119,54 @@ struct snp_req_data {
 	unsigned int data_npages;
 };
 
+#define MAX_AUTHTAG_LEN		32
+
+/* See SNP spec SNP_GUEST_REQUEST section for the structure */
+enum msg_type {
+	SNP_MSG_TYPE_INVALID = 0,
+	SNP_MSG_CPUID_REQ,
+	SNP_MSG_CPUID_RSP,
+	SNP_MSG_KEY_REQ,
+	SNP_MSG_KEY_RSP,
+	SNP_MSG_REPORT_REQ,
+	SNP_MSG_REPORT_RSP,
+	SNP_MSG_EXPORT_REQ,
+	SNP_MSG_EXPORT_RSP,
+	SNP_MSG_IMPORT_REQ,
+	SNP_MSG_IMPORT_RSP,
+	SNP_MSG_ABSORB_REQ,
+	SNP_MSG_ABSORB_RSP,
+	SNP_MSG_VMRK_REQ,
+	SNP_MSG_VMRK_RSP,
+
+	SNP_MSG_TYPE_MAX
+};
+
+enum aead_algo {
+	SNP_AEAD_INVALID,
+	SNP_AEAD_AES_256_GCM,
+};
+
+struct snp_guest_msg_hdr {
+	u8 authtag[MAX_AUTHTAG_LEN];
+	u64 msg_seqno;
+	u8 rsvd1[8];
+	u8 algo;
+	u8 hdr_version;
+	u16 hdr_sz;
+	u8 msg_type;
+	u8 msg_version;
+	u16 msg_sz;
+	u32 rsvd2;
+	u8 msg_vmpck;
+	u8 rsvd3[35];
+} __packed;
+
+struct snp_guest_msg {
+	struct snp_guest_msg_hdr hdr;
+	u8 payload[4000];
+} __packed;
+
 struct sev_guest_platform_data {
 	u64 secrets_gpa;
 };

drivers/virt/coco/sev-guest/sev-guest.c

@@ -29,8 +29,6 @@
 #include <asm/svm.h>
 #include <asm/sev.h>
 
-#include "sev-guest.h"
-
 #define DEVICE_NAME	"sev-guest"
 #define AAD_LEN		48
 #define MSG_HDR_VER	1

drivers/virt/coco/sev-guest/sev-guest.h

-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (C) 2021 Advanced Micro Devices, Inc.
- *
- * Author: Brijesh Singh <brijesh.singh@amd.com>
- *
- * SEV-SNP API spec is available at https://developer.amd.com/sev
- */
-
-#ifndef __VIRT_SEVGUEST_H__
-#define __VIRT_SEVGUEST_H__
-
-#include <linux/types.h>
-
-#define MAX_AUTHTAG_LEN		32
-
-/* See SNP spec SNP_GUEST_REQUEST section for the structure */
-enum msg_type {
-	SNP_MSG_TYPE_INVALID = 0,
-	SNP_MSG_CPUID_REQ,
-	SNP_MSG_CPUID_RSP,
-	SNP_MSG_KEY_REQ,
-	SNP_MSG_KEY_RSP,
-	SNP_MSG_REPORT_REQ,
-	SNP_MSG_REPORT_RSP,
-	SNP_MSG_EXPORT_REQ,
-	SNP_MSG_EXPORT_RSP,
-	SNP_MSG_IMPORT_REQ,
-	SNP_MSG_IMPORT_RSP,
-	SNP_MSG_ABSORB_REQ,
-	SNP_MSG_ABSORB_RSP,
-	SNP_MSG_VMRK_REQ,
-	SNP_MSG_VMRK_RSP,
-
-	SNP_MSG_TYPE_MAX
-};
-
-enum aead_algo {
-	SNP_AEAD_INVALID,
-	SNP_AEAD_AES_256_GCM,
-};
-
-struct snp_guest_msg_hdr {
-	u8 authtag[MAX_AUTHTAG_LEN];
-	u64 msg_seqno;
-	u8 rsvd1[8];
-	u8 algo;
-	u8 hdr_version;
-	u16 hdr_sz;
-	u8 msg_type;
-	u8 msg_version;
-	u16 msg_sz;
-	u32 rsvd2;
-	u8 msg_vmpck;
-	u8 rsvd3[35];
-} __packed;
-
-struct snp_guest_msg {
-	struct snp_guest_msg_hdr hdr;
-	u8 payload[4000];
-} __packed;
-
-#endif /* __VIRT_SEVGUEST_H__ */