1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Test for x86 KVM_CAP_HYPERV_CPUID
4 *
5 * Copyright (C) 2018, Red Hat, Inc.
6 *
7 * This work is licensed under the terms of the GNU GPL, version 2.
8 *
9 */
10
11 #define _GNU_SOURCE /* for program_invocation_short_name */
12 #include <fcntl.h>
13 #include <stdio.h>
14 #include <stdlib.h>
15 #include <string.h>
16 #include <sys/ioctl.h>
17
18 #include "test_util.h"
19 #include "kvm_util.h"
20 #include "processor.h"
21 #include "vmx.h"
22
23 #define VCPU_ID 0
24
guest_code(void)25 static void guest_code(void)
26 {
27 }
28
smt_possible(void)29 static bool smt_possible(void)
30 {
31 char buf[16];
32 FILE *f;
33 bool res = true;
34
35 f = fopen("/sys/devices/system/cpu/smt/control", "r");
36 if (f) {
37 if (fread(buf, sizeof(*buf), sizeof(buf), f) > 0) {
38 if (!strncmp(buf, "forceoff", 8) ||
39 !strncmp(buf, "notsupported", 12))
40 res = false;
41 }
42 fclose(f);
43 }
44
45 return res;
46 }
47
test_hv_cpuid(struct kvm_cpuid2 * hv_cpuid_entries,bool evmcs_expected)48 static void test_hv_cpuid(struct kvm_cpuid2 *hv_cpuid_entries,
49 bool evmcs_expected)
50 {
51 int i;
52 int nent = 9;
53 u32 test_val;
54
55 if (evmcs_expected)
56 nent += 1; /* 0x4000000A */
57
58 TEST_ASSERT(hv_cpuid_entries->nent == nent,
59 "KVM_GET_SUPPORTED_HV_CPUID should return %d entries"
60 " with evmcs=%d (returned %d)",
61 nent, evmcs_expected, hv_cpuid_entries->nent);
62
63 for (i = 0; i < hv_cpuid_entries->nent; i++) {
64 struct kvm_cpuid_entry2 *entry = &hv_cpuid_entries->entries[i];
65
66 TEST_ASSERT((entry->function >= 0x40000000) &&
67 (entry->function <= 0x40000082),
68 "function %x is our of supported range",
69 entry->function);
70
71 TEST_ASSERT(evmcs_expected || (entry->function != 0x4000000A),
72 "0x4000000A leaf should not be reported");
73
74 TEST_ASSERT(entry->index == 0,
75 ".index field should be zero");
76
77 TEST_ASSERT(entry->flags == 0,
78 ".flags field should be zero");
79
80 TEST_ASSERT(!entry->padding[0] && !entry->padding[1] &&
81 !entry->padding[2], "padding should be zero");
82
83 switch (entry->function) {
84 case 0x40000000:
85 test_val = 0x40000082;
86
87 TEST_ASSERT(entry->eax == test_val,
88 "Wrong max leaf report in 0x40000000.EAX: %x"
89 " (evmcs=%d)",
90 entry->eax, evmcs_expected
91 );
92 break;
93 case 0x40000004:
94 test_val = entry->eax & (1UL << 18);
95
96 TEST_ASSERT(!!test_val == !smt_possible(),
97 "NoNonArchitecturalCoreSharing bit"
98 " doesn't reflect SMT setting");
99 break;
100 }
101
102 /*
103 * If needed for debug:
104 * fprintf(stdout,
105 * "CPUID%lx EAX=0x%lx EBX=0x%lx ECX=0x%lx EDX=0x%lx\n",
106 * entry->function, entry->eax, entry->ebx, entry->ecx,
107 * entry->edx);
108 */
109 }
110
111 }
112
test_hv_cpuid_e2big(struct kvm_vm * vm,bool system)113 void test_hv_cpuid_e2big(struct kvm_vm *vm, bool system)
114 {
115 static struct kvm_cpuid2 cpuid = {.nent = 0};
116 int ret;
117
118 if (!system)
119 ret = _vcpu_ioctl(vm, VCPU_ID, KVM_GET_SUPPORTED_HV_CPUID, &cpuid);
120 else
121 ret = _kvm_ioctl(vm, KVM_GET_SUPPORTED_HV_CPUID, &cpuid);
122
123 TEST_ASSERT(ret == -1 && errno == E2BIG,
124 "%s KVM_GET_SUPPORTED_HV_CPUID didn't fail with -E2BIG when"
125 " it should have: %d %d", system ? "KVM" : "vCPU", ret, errno);
126 }
127
main(int argc,char * argv[])128 int main(int argc, char *argv[])
129 {
130 struct kvm_vm *vm;
131 struct kvm_cpuid2 *hv_cpuid_entries;
132
133 /* Tell stdout not to buffer its content */
134 setbuf(stdout, NULL);
135
136 if (!kvm_check_cap(KVM_CAP_HYPERV_CPUID)) {
137 print_skip("KVM_CAP_HYPERV_CPUID not supported");
138 exit(KSFT_SKIP);
139 }
140
141 vm = vm_create_default(VCPU_ID, 0, guest_code);
142
143 /* Test vCPU ioctl version */
144 test_hv_cpuid_e2big(vm, false);
145
146 hv_cpuid_entries = vcpu_get_supported_hv_cpuid(vm, VCPU_ID);
147 test_hv_cpuid(hv_cpuid_entries, false);
148 free(hv_cpuid_entries);
149
150 if (!nested_vmx_supported() ||
151 !kvm_check_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) {
152 print_skip("Enlightened VMCS is unsupported");
153 goto do_sys;
154 }
155 vcpu_enable_evmcs(vm, VCPU_ID);
156 hv_cpuid_entries = vcpu_get_supported_hv_cpuid(vm, VCPU_ID);
157 test_hv_cpuid(hv_cpuid_entries, true);
158 free(hv_cpuid_entries);
159
160 do_sys:
161 /* Test system ioctl version */
162 if (!kvm_check_cap(KVM_CAP_SYS_HYPERV_CPUID)) {
163 print_skip("KVM_CAP_SYS_HYPERV_CPUID not supported");
164 goto out;
165 }
166
167 test_hv_cpuid_e2big(vm, true);
168
169 hv_cpuid_entries = kvm_get_supported_hv_cpuid();
170 test_hv_cpuid(hv_cpuid_entries, nested_vmx_supported());
171
172 out:
173 kvm_vm_free(vm);
174
175 return 0;
176 }
177