1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 /*
3  * Userspace interface for TDX guest driver
4  *
5  * Copyright (C) 2022 Intel Corporation
6  */
7 
8 #ifndef _UAPI_LINUX_TDX_GUEST_H_
9 #define _UAPI_LINUX_TDX_GUEST_H_
10 
11 #include <linux/ioctl.h>
12 #include <linux/types.h>
13 
14 /* Length of the REPORTDATA used in TDG.MR.REPORT TDCALL */
15 #define TDX_REPORTDATA_LEN              64
16 
17 /* Length of TDREPORT used in TDG.MR.REPORT TDCALL */
18 #define TDX_REPORT_LEN                  1024
19 
20 /**
21  * struct tdx_report_req - Request struct for TDX_CMD_GET_REPORT0 IOCTL.
22  *
23  * @reportdata: User buffer with REPORTDATA to be included into TDREPORT.
24  *              Typically it can be some nonce provided by attestation
25  *              service, so the generated TDREPORT can be uniquely verified.
26  * @tdreport: User buffer to store TDREPORT output from TDCALL[TDG.MR.REPORT].
27  */
28 struct tdx_report_req {
29 	__u8 reportdata[TDX_REPORTDATA_LEN];
30 	__u8 tdreport[TDX_REPORT_LEN];
31 };
32 
33 /*
34  * TDX_CMD_GET_REPORT0 - Get TDREPORT0 (a.k.a. TDREPORT subtype 0) using
35  *                       TDCALL[TDG.MR.REPORT]
36  *
37  * Return 0 on success, -EIO on TDCALL execution failure, and
38  * standard errno on other general error cases.
39  */
40 #define TDX_CMD_GET_REPORT0              _IOWR('T', 1, struct tdx_report_req)
41 
42 #endif /* _UAPI_LINUX_TDX_GUEST_H_ */
43