1 /*
2 * AMD SEV test cases
3 *
4 * Copyright (c) 2021, Google Inc
5 *
6 * Authors:
7 * Hyunwook (Wooky) Baek <baekhw@google.com>
8 * Zixuan Wang <zixuanwang@google.com>
9 *
10 * SPDX-License-Identifier: LGPL-2.0-or-later
11 */
12
13 #include "libcflat.h"
14 #include "x86/processor.h"
15 #include "x86/amd_sev.h"
16 #include "msr.h"
17
18 #define EXIT_SUCCESS 0
19 #define EXIT_FAILURE 1
20
21 #define TESTDEV_IO_PORT 0xe0
22
23 static char st1[] = "abcdefghijklmnop";
24
test_sev_activation(void)25 static int test_sev_activation(void)
26 {
27 struct cpuid cpuid_out;
28 u64 msr_out;
29
30 printf("SEV activation test is loaded.\n");
31
32 /* Tests if CPUID function to check SEV is implemented */
33 cpuid_out = cpuid(CPUID_FN_LARGEST_EXT_FUNC_NUM);
34 printf("CPUID Fn8000_0000[EAX]: 0x%08x\n", cpuid_out.a);
35 if (cpuid_out.a < CPUID_FN_ENCRYPT_MEM_CAPAB) {
36 printf("CPUID does not support FN%08x\n",
37 CPUID_FN_ENCRYPT_MEM_CAPAB);
38 return EXIT_FAILURE;
39 }
40
41 /* Tests if SEV is supported */
42 cpuid_out = cpuid(CPUID_FN_ENCRYPT_MEM_CAPAB);
43 printf("CPUID Fn8000_001F[EAX]: 0x%08x\n", cpuid_out.a);
44 printf("CPUID Fn8000_001F[EBX]: 0x%08x\n", cpuid_out.b);
45 if (!(cpuid_out.a & SEV_SUPPORT_MASK)) {
46 printf("SEV is not supported.\n");
47 return EXIT_FAILURE;
48 }
49 printf("SEV is supported\n");
50
51 /* Tests if SEV is enabled */
52 msr_out = rdmsr(MSR_SEV_STATUS);
53 printf("MSR C001_0131[EAX]: 0x%08lx\n", msr_out & 0xffffffff);
54 if (!(msr_out & SEV_ENABLED_MASK)) {
55 printf("SEV is not enabled.\n");
56 return EXIT_FAILURE;
57 }
58 printf("SEV is enabled\n");
59
60 return EXIT_SUCCESS;
61 }
62
test_sev_es_activation(void)63 static void test_sev_es_activation(void)
64 {
65 if (rdmsr(MSR_SEV_STATUS) & SEV_ES_ENABLED_MASK) {
66 printf("SEV-ES is enabled.\n");
67 } else {
68 printf("SEV-ES is not enabled.\n");
69 }
70 }
71
test_stringio(void)72 static void test_stringio(void)
73 {
74 int st1_len = sizeof(st1) - 1;
75 u16 got;
76
77 asm volatile("cld \n\t"
78 "movw %0, %%dx \n\t"
79 "rep outsw \n\t"
80 : : "i"((short)TESTDEV_IO_PORT),
81 "S"(st1), "c"(st1_len / 2));
82
83 asm volatile("inw %1, %0\n\t" : "=a"(got) : "i"((short)TESTDEV_IO_PORT));
84
85 report((got & 0xff) == st1[sizeof(st1) - 3], "outsb nearly up");
86 report((got & 0xff00) >> 8 == st1[sizeof(st1) - 2], "outsb up");
87 }
88
main(void)89 int main(void)
90 {
91 int rtn;
92 rtn = test_sev_activation();
93 report(rtn == EXIT_SUCCESS, "SEV activation test.");
94 test_sev_es_activation();
95 test_stringio();
96 return report_summary();
97 }
98