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 
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 
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 
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 
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 
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 
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