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
test_hv_cpuid(struct kvm_vcpu * vcpu,bool evmcs_expected)25 static void test_hv_cpuid(struct kvm_vcpu *vcpu, bool evmcs_expected)
26 {
27 const bool has_irqchip = !vcpu || vcpu->vm->has_irqchip;
28 const struct kvm_cpuid2 *hv_cpuid_entries;
29 int i;
30 int nent_expected = 10;
31 u32 test_val;
32
33 if (vcpu)
34 hv_cpuid_entries = vcpu_get_supported_hv_cpuid(vcpu);
35 else
36 hv_cpuid_entries = kvm_get_supported_hv_cpuid();
37
38 TEST_ASSERT(hv_cpuid_entries->nent == nent_expected,
39 "KVM_GET_SUPPORTED_HV_CPUID should return %d entries"
40 " (returned %d)",
41 nent_expected, hv_cpuid_entries->nent);
42
43 for (i = 0; i < hv_cpuid_entries->nent; i++) {
44 const struct kvm_cpuid_entry2 *entry = &hv_cpuid_entries->entries[i];
45
46 TEST_ASSERT((entry->function >= 0x40000000) &&
47 (entry->function <= 0x40000082),
48 "function %x is out of supported range",
49 entry->function);
50
51 TEST_ASSERT(entry->index == 0,
52 ".index field should be zero");
53
54 TEST_ASSERT(entry->flags == 0,
55 ".flags field should be zero");
56
57 TEST_ASSERT(!entry->padding[0] && !entry->padding[1] &&
58 !entry->padding[2], "padding should be zero");
59
60 switch (entry->function) {
61 case 0x40000000:
62 test_val = 0x40000082;
63
64 TEST_ASSERT(entry->eax == test_val,
65 "Wrong max leaf report in 0x40000000.EAX: %x"
66 " (evmcs=%d)",
67 entry->eax, evmcs_expected
68 );
69 break;
70 case 0x40000003:
71 TEST_ASSERT(has_irqchip || !(entry->edx & BIT(19)),
72 "\"Direct\" Synthetic Timers should require in-kernel APIC");
73 break;
74 case 0x40000004:
75 test_val = entry->eax & (1UL << 18);
76
77 TEST_ASSERT(!!test_val == !is_smt_possible(),
78 "NoNonArchitecturalCoreSharing bit"
79 " doesn't reflect SMT setting");
80
81 TEST_ASSERT(has_irqchip || !(entry->eax & BIT(10)),
82 "Cluster IPI (i.e. SEND_IPI) should require in-kernel APIC");
83 break;
84 case 0x4000000A:
85 TEST_ASSERT(entry->eax & (1UL << 19),
86 "Enlightened MSR-Bitmap should always be supported"
87 " 0x40000000.EAX: %x", entry->eax);
88 if (evmcs_expected)
89 TEST_ASSERT((entry->eax & 0xffff) == 0x101,
90 "Supported Enlightened VMCS version range is supposed to be 1:1"
91 " 0x40000000.EAX: %x", entry->eax);
92
93 break;
94 default:
95 break;
96
97 }
98 /*
99 * If needed for debug:
100 * fprintf(stdout,
101 * "CPUID%lx EAX=0x%lx EBX=0x%lx ECX=0x%lx EDX=0x%lx\n",
102 * entry->function, entry->eax, entry->ebx, entry->ecx,
103 * entry->edx);
104 */
105 }
106
107 /*
108 * Note, the CPUID array returned by the system-scoped helper is a one-
109 * time allocation, i.e. must not be freed.
110 */
111 if (vcpu)
112 free((void *)hv_cpuid_entries);
113 }
114
test_hv_cpuid_e2big(struct kvm_vm * vm,struct kvm_vcpu * vcpu)115 static void test_hv_cpuid_e2big(struct kvm_vm *vm, struct kvm_vcpu *vcpu)
116 {
117 static struct kvm_cpuid2 cpuid = {.nent = 0};
118 int ret;
119
120 if (vcpu)
121 ret = __vcpu_ioctl(vcpu, KVM_GET_SUPPORTED_HV_CPUID, &cpuid);
122 else
123 ret = __kvm_ioctl(vm->kvm_fd, KVM_GET_SUPPORTED_HV_CPUID, &cpuid);
124
125 TEST_ASSERT(ret == -1 && errno == E2BIG,
126 "%s KVM_GET_SUPPORTED_HV_CPUID didn't fail with -E2BIG when"
127 " it should have: %d %d", !vcpu ? "KVM" : "vCPU", ret, errno);
128 }
129
main(int argc,char * argv[])130 int main(int argc, char *argv[])
131 {
132 struct kvm_vm *vm;
133 struct kvm_vcpu *vcpu;
134
135 TEST_REQUIRE(kvm_has_cap(KVM_CAP_HYPERV_CPUID));
136
137 /* Test the vCPU ioctl without an in-kernel local APIC. */
138 vm = vm_create_barebones();
139 vcpu = __vm_vcpu_add(vm, 0);
140 test_hv_cpuid(vcpu, false);
141 kvm_vm_free(vm);
142
143 /* Test vCPU ioctl version */
144 vm = vm_create_with_one_vcpu(&vcpu, guest_code);
145 test_hv_cpuid_e2big(vm, vcpu);
146 test_hv_cpuid(vcpu, false);
147
148 if (!kvm_cpu_has(X86_FEATURE_VMX) ||
149 !kvm_has_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) {
150 print_skip("Enlightened VMCS is unsupported");
151 goto do_sys;
152 }
153 vcpu_enable_evmcs(vcpu);
154 test_hv_cpuid(vcpu, true);
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 test_hv_cpuid(NULL, kvm_cpu_has(X86_FEATURE_VMX));
165
166 out:
167 kvm_vm_free(vm);
168
169 return 0;
170 }
171