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// SPDX-License-Identifier: GPL-2.0
/*
* Test TDX guest features
*
* Copyright (C) 2022 Intel Corporation.
*
* Author: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
*/
#include <sys/ioctl.h>
#include <errno.h>
#include <fcntl.h>
#include "../kselftest_harness.h"
#include "../../../../include/uapi/linux/tdx-guest.h"
#define TDX_GUEST_DEVNAME "/dev/tdx_guest"
#define HEX_DUMP_SIZE 8
#define DEBUG 0
/**
* struct tdreport_type - Type header of TDREPORT_STRUCT.
* @type: Type of the TDREPORT (0 - SGX, 81 - TDX, rest are reserved)
* @sub_type: Subtype of the TDREPORT (Default value is 0).
* @version: TDREPORT version (Default value is 0).
* @reserved: Added for future extension.
*
* More details can be found in TDX v1.0 module specification, sec
* titled "REPORTTYPE".
*/
struct tdreport_type {
__u8 type;
__u8 sub_type;
__u8 version;
__u8 reserved;
};
/**
* struct reportmac - TDX guest report data, MAC and TEE hashes.
* @type: TDREPORT type header.
* @reserved1: Reserved for future extension.
* @cpu_svn: CPU security version.
* @tee_tcb_info_hash: SHA384 hash of TEE TCB INFO.
* @tee_td_info_hash: SHA384 hash of TDINFO_STRUCT.
* @reportdata: User defined unique data passed in TDG.MR.REPORT request.
* @reserved2: Reserved for future extension.
* @mac: CPU MAC ID.
*
* It is MAC-protected and contains hashes of the remainder of the
* report structure along with user provided report data. More details can
* be found in TDX v1.0 Module specification, sec titled "REPORTMACSTRUCT"
*/
struct reportmac {
struct tdreport_type type;
__u8 reserved1[12];
__u8 cpu_svn[16];
__u8 tee_tcb_info_hash[48];
__u8 tee_td_info_hash[48];
__u8 reportdata[64];
__u8 reserved2[32];
__u8 mac[32];
};
/**
* struct td_info - TDX guest measurements and configuration.
* @attr: TDX Guest attributes (like debug, spet_disable, etc).
* @xfam: Extended features allowed mask.
* @mrtd: Build time measurement register.
* @mrconfigid: Software-defined ID for non-owner-defined configuration
* of the guest - e.g., run-time or OS configuration.
* @mrowner: Software-defined ID for the guest owner.
* @mrownerconfig: Software-defined ID for owner-defined configuration of
* the guest - e.g., specific to the workload.
* @rtmr: Run time measurement registers.
* @reserved: Added for future extension.
*
* It contains the measurements and initial configuration of the TDX guest
* that was locked at initialization and a set of measurement registers
* that are run-time extendable. More details can be found in TDX v1.0
* Module specification, sec titled "TDINFO_STRUCT".
*/
struct td_info {
__u8 attr[8];
__u64 xfam;
__u64 mrtd[6];
__u64 mrconfigid[6];
__u64 mrowner[6];
__u64 mrownerconfig[6];
__u64 rtmr[24];
__u64 reserved[14];
};
/*
* struct tdreport - Output of TDCALL[TDG.MR.REPORT].
* @reportmac: Mac protected header of size 256 bytes.
* @tee_tcb_info: Additional attestable elements in the TCB are not
* reflected in the reportmac.
* @reserved: Added for future extension.
* @tdinfo: Measurements and configuration data of size 512 bytes.
*
* More details can be found in TDX v1.0 Module specification, sec
* titled "TDREPORT_STRUCT".
*/
struct tdreport {
struct reportmac reportmac;
__u8 tee_tcb_info[239];
__u8 reserved[17];
struct td_info tdinfo;
};
static void print_array_hex(const char *title, const char *prefix_str,
const void *buf, int len)
{
int i, j, line_len, rowsize = HEX_DUMP_SIZE;
const __u8 *ptr = buf;
printf("\t\t%s", title);
for (j = 0; j < len; j += rowsize) {
line_len = rowsize < (len - j) ? rowsize : (len - j);
printf("%s%.8x:", prefix_str, j);
for (i = 0; i < line_len; i++)
printf(" %.2x", ptr[j + i]);
printf("\n");
}
printf("\n");
}
TEST(verify_report)
{
struct tdx_report_req req;
struct tdreport *tdreport;
int devfd, i;
devfd = open(TDX_GUEST_DEVNAME, O_RDWR | O_SYNC);
ASSERT_LT(0, devfd);
/* Generate sample report data */
for (i = 0; i < TDX_REPORTDATA_LEN; i++)
req.reportdata[i] = i;
/* Get TDREPORT */
ASSERT_EQ(0, ioctl(devfd, TDX_CMD_GET_REPORT0, &req));
if (DEBUG) {
print_array_hex("\n\t\tTDX report data\n", "",
req.reportdata, sizeof(req.reportdata));
print_array_hex("\n\t\tTDX tdreport data\n", "",
req.tdreport, sizeof(req.tdreport));
}
/* Make sure TDREPORT data includes the REPORTDATA passed */
tdreport = (struct tdreport *)req.tdreport;
ASSERT_EQ(0, memcmp(&tdreport->reportmac.reportdata[0],
req.reportdata, sizeof(req.reportdata)));
ASSERT_EQ(0, close(devfd));
}
TEST_HARNESS_MAIN
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