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 #include <fcntl.h>
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <string.h>
14 #include <sys/ioctl.h>
15
16 #include "test_util.h"
17 #include "kvm_util.h"
18 #include "processor.h"
19 #include "vmx.h"
20
guest_code(void)21 static void guest_code(void)
22 {
23 }
24
smt_possible(void)25 static bool smt_possible(void)
26 {
27 char buf[16];
28 FILE *f;
29 bool res = true;
30
31 f = fopen("/sys/devices/system/cpu/smt/control", "r");
32 if (f) {
33 if (fread(buf, sizeof(*buf), sizeof(buf), f) > 0) {
34 if (!strncmp(buf, "forceoff", 8) ||
35 !strncmp(buf, "notsupported", 12))
36 res = false;
37 }
38 fclose(f);
39 }
40
41 return res;
42 }
43
test_hv_cpuid(const struct kvm_cpuid2 * hv_cpuid_entries,bool evmcs_expected)44 static void test_hv_cpuid(const struct kvm_cpuid2 *hv_cpuid_entries,
45 bool evmcs_expected)
46 {
47 int i;
48 int nent_expected = 10;
49 u32 test_val;
50
51 TEST_ASSERT(hv_cpuid_entries->nent == nent_expected,
52 "KVM_GET_SUPPORTED_HV_CPUID should return %d entries"
53 " (returned %d)",
54 nent_expected, hv_cpuid_entries->nent);
55
56 for (i = 0; i < hv_cpuid_entries->nent; i++) {
57 const struct kvm_cpuid_entry2 *entry = &hv_cpuid_entries->entries[i];
58
59 TEST_ASSERT((entry->function >= 0x40000000) &&
60 (entry->function <= 0x40000082),
61 "function %x is our of supported range",
62 entry->function);
63
64 TEST_ASSERT(entry->index == 0,
65 ".index field should be zero");
66
67 TEST_ASSERT(entry->flags == 0,
68 ".flags field should be zero");
69
70 TEST_ASSERT(!entry->padding[0] && !entry->padding[1] &&
71 !entry->padding[2], "padding should be zero");
72
73 switch (entry->function) {
74 case 0x40000000:
75 test_val = 0x40000082;
76
77 TEST_ASSERT(entry->eax == test_val,
78 "Wrong max leaf report in 0x40000000.EAX: %x"
79 " (evmcs=%d)",
80 entry->eax, evmcs_expected
81 );
82 break;
83 case 0x40000004:
84 test_val = entry->eax & (1UL << 18);
85
86 TEST_ASSERT(!!test_val == !smt_possible(),
87 "NoNonArchitecturalCoreSharing bit"
88 " doesn't reflect SMT setting");
89 break;
90 case 0x4000000A:
91 TEST_ASSERT(entry->eax & (1UL << 19),
92 "Enlightened MSR-Bitmap should always be supported"
93 " 0x40000000.EAX: %x", entry->eax);
94 if (evmcs_expected)
95 TEST_ASSERT((entry->eax & 0xffff) == 0x101,
96 "Supported Enlightened VMCS version range is supposed to be 1:1"
97 " 0x40000000.EAX: %x", entry->eax);
98
99 break;
100 default:
101 break;
102
103 }
104 /*
105 * If needed for debug:
106 * fprintf(stdout,
107 * "CPUID%lx EAX=0x%lx EBX=0x%lx ECX=0x%lx EDX=0x%lx\n",
108 * entry->function, entry->eax, entry->ebx, entry->ecx,
109 * entry->edx);
110 */
111 }
112 }
113
test_hv_cpuid_e2big(struct kvm_vm * vm,struct kvm_vcpu * vcpu)114 void test_hv_cpuid_e2big(struct kvm_vm *vm, struct kvm_vcpu *vcpu)
115 {
116 static struct kvm_cpuid2 cpuid = {.nent = 0};
117 int ret;
118
119 if (vcpu)
120 ret = __vcpu_ioctl(vcpu, KVM_GET_SUPPORTED_HV_CPUID, &cpuid);
121 else
122 ret = __kvm_ioctl(vm->kvm_fd, KVM_GET_SUPPORTED_HV_CPUID, &cpuid);
123
124 TEST_ASSERT(ret == -1 && errno == E2BIG,
125 "%s KVM_GET_SUPPORTED_HV_CPUID didn't fail with -E2BIG when"
126 " it should have: %d %d", !vcpu ? "KVM" : "vCPU", ret, errno);
127 }
128
main(int argc,char * argv[])129 int main(int argc, char *argv[])
130 {
131 struct kvm_vm *vm;
132 const struct kvm_cpuid2 *hv_cpuid_entries;
133 struct kvm_vcpu *vcpu;
134
135 TEST_REQUIRE(kvm_has_cap(KVM_CAP_HYPERV_CPUID));
136
137 vm = vm_create_with_one_vcpu(&vcpu, guest_code);
138
139 /* Test vCPU ioctl version */
140 test_hv_cpuid_e2big(vm, vcpu);
141
142 hv_cpuid_entries = vcpu_get_supported_hv_cpuid(vcpu);
143 test_hv_cpuid(hv_cpuid_entries, false);
144 free((void *)hv_cpuid_entries);
145
146 if (!kvm_cpu_has(X86_FEATURE_VMX) ||
147 !kvm_has_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) {
148 print_skip("Enlightened VMCS is unsupported");
149 goto do_sys;
150 }
151 vcpu_enable_evmcs(vcpu);
152 hv_cpuid_entries = vcpu_get_supported_hv_cpuid(vcpu);
153 test_hv_cpuid(hv_cpuid_entries, true);
154 free((void *)hv_cpuid_entries);
155
156 do_sys:
157 /* Test system ioctl version */
158 if (!kvm_has_cap(KVM_CAP_SYS_HYPERV_CPUID)) {
159 print_skip("KVM_CAP_SYS_HYPERV_CPUID not supported");
160 goto out;
161 }
162
163 test_hv_cpuid_e2big(vm, NULL);
164
165 hv_cpuid_entries = kvm_get_supported_hv_cpuid();
166 test_hv_cpuid(hv_cpuid_entries, kvm_cpu_has(X86_FEATURE_VMX));
167
168 out:
169 kvm_vm_free(vm);
170
171 return 0;
172 }
173