1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2021, Red Hat Inc.
4 *
5 * Generic tests for KVM CPUID set/get ioctls
6 */
7 #include <asm/kvm_para.h>
8 #include <linux/kvm_para.h>
9 #include <stdint.h>
10
11 #include "test_util.h"
12 #include "kvm_util.h"
13 #include "processor.h"
14
15 /* CPUIDs known to differ */
16 struct {
17 u32 function;
18 u32 index;
19 } mangled_cpuids[] = {
20 /*
21 * These entries depend on the vCPU's XCR0 register and IA32_XSS MSR,
22 * which are not controlled for by this test.
23 */
24 {.function = 0xd, .index = 0},
25 {.function = 0xd, .index = 1},
26 };
27
28 static void test_guest_cpuids(struct kvm_cpuid2 *guest_cpuid)
29 {
30 int i;
31 u32 eax, ebx, ecx, edx;
32
33 for (i = 0; i < guest_cpuid->nent; i++) {
34 __cpuid(guest_cpuid->entries[i].function,
35 guest_cpuid->entries[i].index,
36 &eax, &ebx, &ecx, &edx);
37
38 GUEST_ASSERT_EQ(eax, guest_cpuid->entries[i].eax);
39 GUEST_ASSERT_EQ(ebx, guest_cpuid->entries[i].ebx);
40 GUEST_ASSERT_EQ(ecx, guest_cpuid->entries[i].ecx);
41 GUEST_ASSERT_EQ(edx, guest_cpuid->entries[i].edx);
42 }
43
44 }
45
46 static void guest_main(struct kvm_cpuid2 *guest_cpuid)
47 {
48 GUEST_SYNC(1);
49
50 test_guest_cpuids(guest_cpuid);
51
52 GUEST_SYNC(2);
53
54 GUEST_ASSERT_EQ(this_cpu_property(X86_PROPERTY_MAX_KVM_LEAF), 0x40000001);
55
56 GUEST_DONE();
57 }
58
59 static bool is_cpuid_mangled(const struct kvm_cpuid_entry2 *entrie)
60 {
61 int i;
62
63 for (i = 0; i < sizeof(mangled_cpuids); i++) {
64 if (mangled_cpuids[i].function == entrie->function &&
65 mangled_cpuids[i].index == entrie->index)
66 return true;
67 }
68
69 return false;
70 }
71
72 static void compare_cpuids(const struct kvm_cpuid2 *cpuid1,
73 const struct kvm_cpuid2 *cpuid2)
74 {
75 const struct kvm_cpuid_entry2 *e1, *e2;
76 int i;
77
78 TEST_ASSERT(cpuid1->nent == cpuid2->nent,
79 "CPUID nent mismatch: %d vs. %d", cpuid1->nent, cpuid2->nent);
80
81 for (i = 0; i < cpuid1->nent; i++) {
82 e1 = &cpuid1->entries[i];
83 e2 = &cpuid2->entries[i];
84
85 TEST_ASSERT(e1->function == e2->function &&
86 e1->index == e2->index && e1->flags == e2->flags,
87 "CPUID entries[%d] mismtach: 0x%x.%d.%x vs. 0x%x.%d.%x",
88 i, e1->function, e1->index, e1->flags,
89 e2->function, e2->index, e2->flags);
90
91 if (is_cpuid_mangled(e1))
92 continue;
93
94 TEST_ASSERT(e1->eax == e2->eax && e1->ebx == e2->ebx &&
95 e1->ecx == e2->ecx && e1->edx == e2->edx,
96 "CPUID 0x%x.%x differ: 0x%x:0x%x:0x%x:0x%x vs 0x%x:0x%x:0x%x:0x%x",
97 e1->function, e1->index,
98 e1->eax, e1->ebx, e1->ecx, e1->edx,
99 e2->eax, e2->ebx, e2->ecx, e2->edx);
100 }
101 }
102
103 static void run_vcpu(struct kvm_vcpu *vcpu, int stage)
104 {
105 struct ucall uc;
106
107 vcpu_run(vcpu);
108
109 switch (get_ucall(vcpu, &uc)) {
110 case UCALL_SYNC:
111 TEST_ASSERT(!strcmp((const char *)uc.args[0], "hello") &&
112 uc.args[1] == stage + 1,
113 "Stage %d: Unexpected register values vmexit, got %lx",
114 stage + 1, (ulong)uc.args[1]);
115 return;
116 case UCALL_DONE:
117 return;
118 case UCALL_ABORT:
119 REPORT_GUEST_ASSERT(uc);
120 default:
121 TEST_ASSERT(false, "Unexpected exit: %s",
122 exit_reason_str(vcpu->run->exit_reason));
123 }
124 }
125
126 struct kvm_cpuid2 *vcpu_alloc_cpuid(struct kvm_vm *vm, vm_vaddr_t *p_gva, struct kvm_cpuid2 *cpuid)
127 {
128 int size = sizeof(*cpuid) + cpuid->nent * sizeof(cpuid->entries[0]);
129 vm_vaddr_t gva = vm_vaddr_alloc(vm, size, KVM_UTIL_MIN_VADDR);
130 struct kvm_cpuid2 *guest_cpuids = addr_gva2hva(vm, gva);
131
132 memcpy(guest_cpuids, cpuid, size);
133
134 *p_gva = gva;
135 return guest_cpuids;
136 }
137
138 static void set_cpuid_after_run(struct kvm_vcpu *vcpu)
139 {
140 struct kvm_cpuid_entry2 *ent;
141 int rc;
142 u32 eax, ebx, x;
143
144 /* Setting unmodified CPUID is allowed */
145 rc = __vcpu_set_cpuid(vcpu);
146 TEST_ASSERT(!rc, "Setting unmodified CPUID after KVM_RUN failed: %d", rc);
147
148 /* Changing CPU features is forbidden */
149 ent = vcpu_get_cpuid_entry(vcpu, 0x7);
150 ebx = ent->ebx;
151 ent->ebx--;
152 rc = __vcpu_set_cpuid(vcpu);
153 TEST_ASSERT(rc, "Changing CPU features should fail");
154 ent->ebx = ebx;
155
156 /* Changing MAXPHYADDR is forbidden */
157 ent = vcpu_get_cpuid_entry(vcpu, 0x80000008);
158 eax = ent->eax;
159 x = eax & 0xff;
160 ent->eax = (eax & ~0xffu) | (x - 1);
161 rc = __vcpu_set_cpuid(vcpu);
162 TEST_ASSERT(rc, "Changing MAXPHYADDR should fail");
163 ent->eax = eax;
164 }
165
166 static void test_get_cpuid2(struct kvm_vcpu *vcpu)
167 {
168 struct kvm_cpuid2 *cpuid = allocate_kvm_cpuid2(vcpu->cpuid->nent + 1);
169 int i, r;
170
171 vcpu_ioctl(vcpu, KVM_GET_CPUID2, cpuid);
172 TEST_ASSERT(cpuid->nent == vcpu->cpuid->nent,
173 "KVM didn't update nent on success, wanted %u, got %u",
174 vcpu->cpuid->nent, cpuid->nent);
175
176 for (i = 0; i < vcpu->cpuid->nent; i++) {
177 cpuid->nent = i;
178 r = __vcpu_ioctl(vcpu, KVM_GET_CPUID2, cpuid);
179 TEST_ASSERT(r && errno == E2BIG, KVM_IOCTL_ERROR(KVM_GET_CPUID2, r));
180 TEST_ASSERT(cpuid->nent == i, "KVM modified nent on failure");
181 }
182 free(cpuid);
183 }
184
185 int main(void)
186 {
187 struct kvm_vcpu *vcpu;
188 vm_vaddr_t cpuid_gva;
189 struct kvm_vm *vm;
190 int stage;
191
192 vm = vm_create_with_one_vcpu(&vcpu, guest_main);
193
194 compare_cpuids(kvm_get_supported_cpuid(), vcpu->cpuid);
195
196 vcpu_alloc_cpuid(vm, &cpuid_gva, vcpu->cpuid);
197
198 vcpu_args_set(vcpu, 1, cpuid_gva);
199
200 for (stage = 0; stage < 3; stage++)
201 run_vcpu(vcpu, stage);
202
203 set_cpuid_after_run(vcpu);
204
205 test_get_cpuid2(vcpu);
206
207 kvm_vm_free(vm);
208 }
209
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