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ac4a4d6d OU |
1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* | |
3 | * Copyright (C) 2020, Google LLC. | |
4 | * | |
5 | * Tests for KVM paravirtual feature disablement | |
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 | ||
ac4a4d6d OU |
15 | struct msr_data { |
16 | uint32_t idx; | |
17 | const char *name; | |
18 | }; | |
19 | ||
20 | #define TEST_MSR(msr) { .idx = msr, .name = #msr } | |
21 | #define UCALL_PR_MSR 0xdeadbeef | |
22 | #define PR_MSR(msr) ucall(UCALL_PR_MSR, 1, msr) | |
23 | ||
24 | /* | |
25 | * KVM paravirtual msrs to test. Expect a #GP if any of these msrs are read or | |
26 | * written, as the KVM_CPUID_FEATURES leaf is cleared. | |
27 | */ | |
28 | static struct msr_data msrs_to_test[] = { | |
29 | TEST_MSR(MSR_KVM_SYSTEM_TIME), | |
30 | TEST_MSR(MSR_KVM_SYSTEM_TIME_NEW), | |
31 | TEST_MSR(MSR_KVM_WALL_CLOCK), | |
32 | TEST_MSR(MSR_KVM_WALL_CLOCK_NEW), | |
33 | TEST_MSR(MSR_KVM_ASYNC_PF_EN), | |
34 | TEST_MSR(MSR_KVM_STEAL_TIME), | |
35 | TEST_MSR(MSR_KVM_PV_EOI_EN), | |
36 | TEST_MSR(MSR_KVM_POLL_CONTROL), | |
37 | TEST_MSR(MSR_KVM_ASYNC_PF_INT), | |
38 | TEST_MSR(MSR_KVM_ASYNC_PF_ACK), | |
39 | }; | |
40 | ||
41 | static void test_msr(struct msr_data *msr) | |
42 | { | |
3b23054c SC |
43 | uint64_t ignored; |
44 | uint8_t vector; | |
45 | ||
ac4a4d6d | 46 | PR_MSR(msr); |
ac4a4d6d | 47 | |
3b23054c | 48 | vector = rdmsr_safe(msr->idx, &ignored); |
bf6c760b | 49 | GUEST_ASSERT_EQ(vector, GP_VECTOR); |
3b23054c SC |
50 | |
51 | vector = wrmsr_safe(msr->idx, 0); | |
bf6c760b | 52 | GUEST_ASSERT_EQ(vector, GP_VECTOR); |
ac4a4d6d OU |
53 | } |
54 | ||
55 | struct hcall_data { | |
56 | uint64_t nr; | |
57 | const char *name; | |
58 | }; | |
59 | ||
60 | #define TEST_HCALL(hc) { .nr = hc, .name = #hc } | |
61 | #define UCALL_PR_HCALL 0xdeadc0de | |
62 | #define PR_HCALL(hc) ucall(UCALL_PR_HCALL, 1, hc) | |
63 | ||
64 | /* | |
65 | * KVM hypercalls to test. Expect -KVM_ENOSYS when called, as the corresponding | |
66 | * features have been cleared in KVM_CPUID_FEATURES. | |
67 | */ | |
68 | static struct hcall_data hcalls_to_test[] = { | |
69 | TEST_HCALL(KVM_HC_KICK_CPU), | |
70 | TEST_HCALL(KVM_HC_SEND_IPI), | |
71 | TEST_HCALL(KVM_HC_SCHED_YIELD), | |
72 | }; | |
73 | ||
74 | static void test_hcall(struct hcall_data *hc) | |
75 | { | |
76 | uint64_t r; | |
77 | ||
78 | PR_HCALL(hc); | |
79 | r = kvm_hypercall(hc->nr, 0, 0, 0, 0); | |
bf6c760b | 80 | GUEST_ASSERT_EQ(r, -KVM_ENOSYS); |
ac4a4d6d OU |
81 | } |
82 | ||
83 | static void guest_main(void) | |
84 | { | |
85 | int i; | |
86 | ||
87 | for (i = 0; i < ARRAY_SIZE(msrs_to_test); i++) { | |
88 | test_msr(&msrs_to_test[i]); | |
89 | } | |
90 | ||
91 | for (i = 0; i < ARRAY_SIZE(hcalls_to_test); i++) { | |
92 | test_hcall(&hcalls_to_test[i]); | |
93 | } | |
94 | ||
95 | GUEST_DONE(); | |
96 | } | |
97 | ||
ac4a4d6d OU |
98 | static void pr_msr(struct ucall *uc) |
99 | { | |
100 | struct msr_data *msr = (struct msr_data *)uc->args[0]; | |
101 | ||
102 | pr_info("testing msr: %s (%#x)\n", msr->name, msr->idx); | |
103 | } | |
104 | ||
105 | static void pr_hcall(struct ucall *uc) | |
106 | { | |
107 | struct hcall_data *hc = (struct hcall_data *)uc->args[0]; | |
108 | ||
109 | pr_info("testing hcall: %s (%lu)\n", hc->name, hc->nr); | |
110 | } | |
111 | ||
f323dbce | 112 | static void enter_guest(struct kvm_vcpu *vcpu) |
ac4a4d6d | 113 | { |
ac4a4d6d | 114 | struct ucall uc; |
ac4a4d6d OU |
115 | |
116 | while (true) { | |
768e9a61 | 117 | vcpu_run(vcpu); |
c96f57b0 | 118 | TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO); |
ac4a4d6d | 119 | |
768e9a61 | 120 | switch (get_ucall(vcpu, &uc)) { |
ac4a4d6d OU |
121 | case UCALL_PR_MSR: |
122 | pr_msr(&uc); | |
123 | break; | |
124 | case UCALL_PR_HCALL: | |
125 | pr_hcall(&uc); | |
126 | break; | |
127 | case UCALL_ABORT: | |
bf6c760b | 128 | REPORT_GUEST_ASSERT(uc); |
ac4a4d6d OU |
129 | return; |
130 | case UCALL_DONE: | |
131 | return; | |
132 | } | |
133 | } | |
134 | } | |
135 | ||
136 | int main(void) | |
137 | { | |
f323dbce | 138 | struct kvm_vcpu *vcpu; |
ac4a4d6d OU |
139 | struct kvm_vm *vm; |
140 | ||
7ed397d1 | 141 | TEST_REQUIRE(kvm_has_cap(KVM_CAP_ENFORCE_PV_FEATURE_CPUID)); |
ac4a4d6d | 142 | |
f323dbce | 143 | vm = vm_create_with_one_vcpu(&vcpu, guest_main); |
ac4a4d6d | 144 | |
768e9a61 | 145 | vcpu_enable_cap(vcpu, KVM_CAP_ENFORCE_PV_FEATURE_CPUID, 1); |
ac4a4d6d | 146 | |
3a5d36b3 | 147 | vcpu_clear_cpuid_entry(vcpu, KVM_CPUID_FEATURES); |
ac4a4d6d OU |
148 | |
149 | vm_init_descriptor_tables(vm); | |
768e9a61 | 150 | vcpu_init_descriptor_tables(vcpu); |
ac4a4d6d | 151 | |
f323dbce | 152 | enter_guest(vcpu); |
ac4a4d6d OU |
153 | kvm_vm_free(vm); |
154 | } |