1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * VMX control MSR test
4 *
5 * Copyright (C) 2022 Google LLC.
6 *
7 * Tests for KVM ownership of bits in the VMX entry/exit control MSRs. Checks
8 * that KVM will set owned bits where appropriate, and will not if
9 * KVM_X86_QUIRK_TWEAK_VMX_CTRL_MSRS is disabled.
10 */
11 #include <linux/bitmap.h>
12 #include "kvm_util.h"
13 #include "vmx.h"
14
vmx_fixed1_msr_test(struct kvm_vcpu * vcpu,uint32_t msr_index,uint64_t mask)15 static void vmx_fixed1_msr_test(struct kvm_vcpu *vcpu, uint32_t msr_index,
16 uint64_t mask)
17 {
18 uint64_t val = vcpu_get_msr(vcpu, msr_index);
19 uint64_t bit;
20
21 mask &= val;
22
23 for_each_set_bit(bit, &mask, 64) {
24 vcpu_set_msr(vcpu, msr_index, val & ~BIT_ULL(bit));
25 vcpu_set_msr(vcpu, msr_index, val);
26 }
27 }
28
vmx_fixed0_msr_test(struct kvm_vcpu * vcpu,uint32_t msr_index,uint64_t mask)29 static void vmx_fixed0_msr_test(struct kvm_vcpu *vcpu, uint32_t msr_index,
30 uint64_t mask)
31 {
32 uint64_t val = vcpu_get_msr(vcpu, msr_index);
33 uint64_t bit;
34
35 mask = ~mask | val;
36
37 for_each_clear_bit(bit, &mask, 64) {
38 vcpu_set_msr(vcpu, msr_index, val | BIT_ULL(bit));
39 vcpu_set_msr(vcpu, msr_index, val);
40 }
41 }
42
vmx_fixed0and1_msr_test(struct kvm_vcpu * vcpu,uint32_t msr_index)43 static void vmx_fixed0and1_msr_test(struct kvm_vcpu *vcpu, uint32_t msr_index)
44 {
45 vmx_fixed0_msr_test(vcpu, msr_index, GENMASK_ULL(31, 0));
46 vmx_fixed1_msr_test(vcpu, msr_index, GENMASK_ULL(63, 32));
47 }
48
vmx_save_restore_msrs_test(struct kvm_vcpu * vcpu)49 static void vmx_save_restore_msrs_test(struct kvm_vcpu *vcpu)
50 {
51 vcpu_set_msr(vcpu, MSR_IA32_VMX_VMCS_ENUM, 0);
52 vcpu_set_msr(vcpu, MSR_IA32_VMX_VMCS_ENUM, -1ull);
53
54 vmx_fixed1_msr_test(vcpu, MSR_IA32_VMX_BASIC,
55 BIT_ULL(49) | BIT_ULL(54) | BIT_ULL(55));
56
57 vmx_fixed1_msr_test(vcpu, MSR_IA32_VMX_MISC,
58 BIT_ULL(5) | GENMASK_ULL(8, 6) | BIT_ULL(14) |
59 BIT_ULL(15) | BIT_ULL(28) | BIT_ULL(29) | BIT_ULL(30));
60
61 vmx_fixed0and1_msr_test(vcpu, MSR_IA32_VMX_PROCBASED_CTLS2);
62 vmx_fixed1_msr_test(vcpu, MSR_IA32_VMX_EPT_VPID_CAP, -1ull);
63 vmx_fixed0and1_msr_test(vcpu, MSR_IA32_VMX_TRUE_PINBASED_CTLS);
64 vmx_fixed0and1_msr_test(vcpu, MSR_IA32_VMX_TRUE_PROCBASED_CTLS);
65 vmx_fixed0and1_msr_test(vcpu, MSR_IA32_VMX_TRUE_EXIT_CTLS);
66 vmx_fixed0and1_msr_test(vcpu, MSR_IA32_VMX_TRUE_ENTRY_CTLS);
67 vmx_fixed1_msr_test(vcpu, MSR_IA32_VMX_VMFUNC, -1ull);
68 }
69
main(void)70 int main(void)
71 {
72 struct kvm_vcpu *vcpu;
73 struct kvm_vm *vm;
74
75 TEST_REQUIRE(kvm_has_cap(KVM_CAP_DISABLE_QUIRKS2));
76 TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_VMX));
77
78 /* No need to actually do KVM_RUN, thus no guest code. */
79 vm = vm_create_with_one_vcpu(&vcpu, NULL);
80
81 vmx_save_restore_msrs_test(vcpu);
82
83 kvm_vm_free(vm);
84 }
85