1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Test that KVM_GET_MSR_INDEX_LIST and
4 * KVM_GET_MSR_FEATURE_INDEX_LIST work as intended
5 *
6 * Copyright (C) 2020, Red Hat, Inc.
7 */
8 #include <fcntl.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <sys/ioctl.h>
13
14 #include "test_util.h"
15 #include "kvm_util.h"
16 #include "processor.h"
17
kvm_num_index_msrs(int kvm_fd,int nmsrs)18 static int kvm_num_index_msrs(int kvm_fd, int nmsrs)
19 {
20 struct kvm_msr_list *list;
21 int r;
22
23 list = malloc(sizeof(*list) + nmsrs * sizeof(list->indices[0]));
24 list->nmsrs = nmsrs;
25 r = ioctl(kvm_fd, KVM_GET_MSR_INDEX_LIST, list);
26 TEST_ASSERT(r == -1 && errno == E2BIG,
27 "Unexpected result from KVM_GET_MSR_INDEX_LIST probe, r: %i",
28 r);
29
30 r = list->nmsrs;
31 free(list);
32 return r;
33 }
34
test_get_msr_index(void)35 static void test_get_msr_index(void)
36 {
37 int old_res, res, kvm_fd, r;
38 struct kvm_msr_list *list;
39
40 kvm_fd = open_kvm_dev_path_or_exit();
41
42 old_res = kvm_num_index_msrs(kvm_fd, 0);
43 TEST_ASSERT(old_res != 0, "Expecting nmsrs to be > 0");
44
45 if (old_res != 1) {
46 res = kvm_num_index_msrs(kvm_fd, 1);
47 TEST_ASSERT(res > 1, "Expecting nmsrs to be > 1");
48 TEST_ASSERT(res == old_res, "Expecting nmsrs to be identical");
49 }
50
51 list = malloc(sizeof(*list) + old_res * sizeof(list->indices[0]));
52 list->nmsrs = old_res;
53 r = ioctl(kvm_fd, KVM_GET_MSR_INDEX_LIST, list);
54
55 TEST_ASSERT(r == 0,
56 "Unexpected result from KVM_GET_MSR_FEATURE_INDEX_LIST, r: %i",
57 r);
58 TEST_ASSERT(list->nmsrs == old_res, "Expecting nmsrs to be identical");
59 free(list);
60
61 close(kvm_fd);
62 }
63
kvm_num_feature_msrs(int kvm_fd,int nmsrs)64 static int kvm_num_feature_msrs(int kvm_fd, int nmsrs)
65 {
66 struct kvm_msr_list *list;
67 int r;
68
69 list = malloc(sizeof(*list) + nmsrs * sizeof(list->indices[0]));
70 list->nmsrs = nmsrs;
71 r = ioctl(kvm_fd, KVM_GET_MSR_FEATURE_INDEX_LIST, list);
72 TEST_ASSERT(r == -1 && errno == E2BIG,
73 "Unexpected result from KVM_GET_MSR_FEATURE_INDEX_LIST probe, r: %i",
74 r);
75
76 r = list->nmsrs;
77 free(list);
78 return r;
79 }
80
kvm_get_msr_feature_list(int kvm_fd,int nmsrs)81 struct kvm_msr_list *kvm_get_msr_feature_list(int kvm_fd, int nmsrs)
82 {
83 struct kvm_msr_list *list;
84 int r;
85
86 list = malloc(sizeof(*list) + nmsrs * sizeof(list->indices[0]));
87 list->nmsrs = nmsrs;
88 r = ioctl(kvm_fd, KVM_GET_MSR_FEATURE_INDEX_LIST, list);
89
90 TEST_ASSERT(r == 0,
91 "Unexpected result from KVM_GET_MSR_FEATURE_INDEX_LIST, r: %i",
92 r);
93
94 return list;
95 }
96
test_get_msr_feature(void)97 static void test_get_msr_feature(void)
98 {
99 int res, old_res, i, kvm_fd;
100 struct kvm_msr_list *feature_list;
101
102 kvm_fd = open_kvm_dev_path_or_exit();
103
104 old_res = kvm_num_feature_msrs(kvm_fd, 0);
105 TEST_ASSERT(old_res != 0, "Expecting nmsrs to be > 0");
106
107 if (old_res != 1) {
108 res = kvm_num_feature_msrs(kvm_fd, 1);
109 TEST_ASSERT(res > 1, "Expecting nmsrs to be > 1");
110 TEST_ASSERT(res == old_res, "Expecting nmsrs to be identical");
111 }
112
113 feature_list = kvm_get_msr_feature_list(kvm_fd, old_res);
114 TEST_ASSERT(old_res == feature_list->nmsrs,
115 "Unmatching number of msr indexes");
116
117 for (i = 0; i < feature_list->nmsrs; i++)
118 kvm_get_feature_msr(feature_list->indices[i]);
119
120 free(feature_list);
121 close(kvm_fd);
122 }
123
main(int argc,char * argv[])124 int main(int argc, char *argv[])
125 {
126 if (kvm_check_cap(KVM_CAP_GET_MSR_FEATURES))
127 test_get_msr_feature();
128
129 test_get_msr_index();
130 }
131