1 /* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
2 /*
3  * Userspace interface for AMD SEV and SNP guest driver.
4  *
5  * Copyright (C) 2021 Advanced Micro Devices, Inc.
6  *
7  * Author: Brijesh Singh <brijesh.singh@amd.com>
8  *
9  * SEV API specification is available at: https://developer.amd.com/sev/
10  */
11 
12 #ifndef __UAPI_LINUX_SEV_GUEST_H_
13 #define __UAPI_LINUX_SEV_GUEST_H_
14 
15 #include <linux/types.h>
16 
17 struct snp_report_req {
18 	/* user data that should be included in the report */
19 	__u8 user_data[64];
20 
21 	/* The vmpl level to be included in the report */
22 	__u32 vmpl;
23 
24 	/* Must be zero filled */
25 	__u8 rsvd[28];
26 };
27 
28 struct snp_report_resp {
29 	/* response data, see SEV-SNP spec for the format */
30 	__u8 data[4000];
31 };
32 
33 struct snp_derived_key_req {
34 	__u32 root_key_select;
35 	__u32 rsvd;
36 	__u64 guest_field_select;
37 	__u32 vmpl;
38 	__u32 guest_svn;
39 	__u64 tcb_version;
40 };
41 
42 struct snp_derived_key_resp {
43 	/* response data, see SEV-SNP spec for the format */
44 	__u8 data[64];
45 };
46 
47 struct snp_guest_request_ioctl {
48 	/* message version number (must be non-zero) */
49 	__u8 msg_version;
50 
51 	/* Request and response structure address */
52 	__u64 req_data;
53 	__u64 resp_data;
54 
55 	/* bits[63:32]: VMM error code, bits[31:0] firmware error code (see psp-sev.h) */
56 	union {
57 		__u64 exitinfo2;
58 		struct {
59 			__u32 fw_error;
60 			__u32 vmm_error;
61 		};
62 	};
63 };
64 
65 struct snp_ext_report_req {
66 	struct snp_report_req data;
67 
68 	/* where to copy the certificate blob */
69 	__u64 certs_address;
70 
71 	/* length of the certificate blob */
72 	__u32 certs_len;
73 };
74 
75 #define SNP_GUEST_REQ_IOC_TYPE	'S'
76 
77 /* Get SNP attestation report */
78 #define SNP_GET_REPORT _IOWR(SNP_GUEST_REQ_IOC_TYPE, 0x0, struct snp_guest_request_ioctl)
79 
80 /* Get a derived key from the root */
81 #define SNP_GET_DERIVED_KEY _IOWR(SNP_GUEST_REQ_IOC_TYPE, 0x1, struct snp_guest_request_ioctl)
82 
83 /* Get SNP extended report as defined in the GHCB specification version 2. */
84 #define SNP_GET_EXT_REPORT _IOWR(SNP_GUEST_REQ_IOC_TYPE, 0x2, struct snp_guest_request_ioctl)
85 
86 /* Guest message request EXIT_INFO_2 constants */
87 #define SNP_GUEST_FW_ERR_MASK		GENMASK_ULL(31, 0)
88 #define SNP_GUEST_VMM_ERR_SHIFT		32
89 #define SNP_GUEST_VMM_ERR(x)		(((u64)x) << SNP_GUEST_VMM_ERR_SHIFT)
90 
91 #define SNP_GUEST_VMM_ERR_INVALID_LEN	1
92 #define SNP_GUEST_VMM_ERR_BUSY		2
93 
94 #endif /* __UAPI_LINUX_SEV_GUEST_H_ */
95