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KVM: selftests: Verify VMX MSRs can be restored to KVM-supported values

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Verify that KVM allows toggling VMX MSR bits to be "more" restrictive,
and also allows restoring each MSR to KVM's original, less restrictive
value.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220607213604.3346000-16-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2022-06-07 21:36:04 +00:00 committed by Paolo Bonzini
parent a910b5ab6b
commit ce30d8b976
4 changed files with 87 additions and 0 deletions
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1
tools/testing/selftests/kvm/.gitignore vendored
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@ -50,6 +50,7 @@
/x86_64/vmx_dirty_log_test
/x86_64/vmx_exception_with_invalid_guest_state
/x86_64/vmx_invalid_nested_guest_state
/x86_64/vmx_msrs_test
/x86_64/vmx_preemption_timer_test
/x86_64/vmx_set_nested_state_test
/x86_64/vmx_tsc_adjust_test

1
tools/testing/selftests/kvm/Makefile
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@ -107,6 +107,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/vmx_apic_access_test
TEST_GEN_PROGS_x86_64 += x86_64/vmx_close_while_nested_test
TEST_GEN_PROGS_x86_64 += x86_64/vmx_dirty_log_test
TEST_GEN_PROGS_x86_64 += x86_64/vmx_exception_with_invalid_guest_state
TEST_GEN_PROGS_x86_64 += x86_64/vmx_msrs_test
TEST_GEN_PROGS_x86_64 += x86_64/vmx_invalid_nested_guest_state
TEST_GEN_PROGS_x86_64 += x86_64/vmx_set_nested_state_test
TEST_GEN_PROGS_x86_64 += x86_64/vmx_tsc_adjust_test

1
tools/testing/selftests/kvm/include/x86_64/processor.h
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@ -100,6 +100,7 @@ struct kvm_x86_cpu_feature {
#define X86_FEATURE_SMEP KVM_X86_CPU_FEATURE(0x7, 0, EBX, 7)
#define X86_FEATURE_INVPCID KVM_X86_CPU_FEATURE(0x7, 0, EBX, 10)
#define X86_FEATURE_RTM KVM_X86_CPU_FEATURE(0x7, 0, EBX, 11)
#define X86_FEATURE_MPX KVM_X86_CPU_FEATURE(0x7, 0, EBX, 14)
#define X86_FEATURE_SMAP KVM_X86_CPU_FEATURE(0x7, 0, EBX, 20)
#define X86_FEATURE_PCOMMIT KVM_X86_CPU_FEATURE(0x7, 0, EBX, 22)
#define X86_FEATURE_CLFLUSHOPT KVM_X86_CPU_FEATURE(0x7, 0, EBX, 23)

84
tools/testing/selftests/kvm/x86_64/vmx_msrs_test.c Normal file
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@ -0,0 +1,84 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* VMX control MSR test
*
* Copyright (C) 2022 Google LLC.
*
* Tests for KVM ownership of bits in the VMX entry/exit control MSRs. Checks
* that KVM will set owned bits where appropriate, and will not if
* KVM_X86_QUIRK_TWEAK_VMX_CTRL_MSRS is disabled.
*/
#include <linux/bitmap.h>
#include "kvm_util.h"
#include "vmx.h"
static void vmx_fixed1_msr_test(struct kvm_vcpu *vcpu, uint32_t msr_index,
uint64_t mask)
{
uint64_t val = vcpu_get_msr(vcpu, msr_index);
uint64_t bit;
mask &= val;
for_each_set_bit(bit, &mask, 64) {
vcpu_set_msr(vcpu, msr_index, val & ~BIT_ULL(bit));
vcpu_set_msr(vcpu, msr_index, val);
}
}
static void vmx_fixed0_msr_test(struct kvm_vcpu *vcpu, uint32_t msr_index,
uint64_t mask)
{
uint64_t val = vcpu_get_msr(vcpu, msr_index);
uint64_t bit;
mask = ~mask | val;
for_each_clear_bit(bit, &mask, 64) {
vcpu_set_msr(vcpu, msr_index, val | BIT_ULL(bit));
vcpu_set_msr(vcpu, msr_index, val);
}
}
static void vmx_fixed0and1_msr_test(struct kvm_vcpu *vcpu, uint32_t msr_index)
{
vmx_fixed0_msr_test(vcpu, msr_index, GENMASK_ULL(31, 0));
vmx_fixed1_msr_test(vcpu, msr_index, GENMASK_ULL(63, 32));
}
static void vmx_save_restore_msrs_test(struct kvm_vcpu *vcpu)
{
vcpu_set_msr(vcpu, MSR_IA32_VMX_VMCS_ENUM, 0);
vcpu_set_msr(vcpu, MSR_IA32_VMX_VMCS_ENUM, -1ull);
vmx_fixed1_msr_test(vcpu, MSR_IA32_VMX_BASIC,
BIT_ULL(49) | BIT_ULL(54) | BIT_ULL(55));
vmx_fixed1_msr_test(vcpu, MSR_IA32_VMX_MISC,
BIT_ULL(5) | GENMASK_ULL(8, 6) | BIT_ULL(14) |
BIT_ULL(15) | BIT_ULL(28) | BIT_ULL(29) | BIT_ULL(30));
vmx_fixed0and1_msr_test(vcpu, MSR_IA32_VMX_PROCBASED_CTLS2);
vmx_fixed1_msr_test(vcpu, MSR_IA32_VMX_EPT_VPID_CAP, -1ull);
vmx_fixed0and1_msr_test(vcpu, MSR_IA32_VMX_TRUE_PINBASED_CTLS);
vmx_fixed0and1_msr_test(vcpu, MSR_IA32_VMX_TRUE_PROCBASED_CTLS);
vmx_fixed0and1_msr_test(vcpu, MSR_IA32_VMX_TRUE_EXIT_CTLS);
vmx_fixed0and1_msr_test(vcpu, MSR_IA32_VMX_TRUE_ENTRY_CTLS);
vmx_fixed1_msr_test(vcpu, MSR_IA32_VMX_VMFUNC, -1ull);
}
int main(void)
{
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
TEST_REQUIRE(kvm_has_cap(KVM_CAP_DISABLE_QUIRKS2));
TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_VMX));
/* No need to actually do KVM_RUN, thus no guest code. */
vm = vm_create_with_one_vcpu(&vcpu, NULL);
vmx_save_restore_msrs_test(vcpu);
kvm_vm_free(vm);
}