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KVM: selftests: Verify disabling PMU virtualization via KVM_CAP_CONFIG_PMU 

On a VM with PMU disabled via KVM_CAP_PMU_CONFIG, the PMU should not be
usable by the guest.

Signed-off-by: David Dunn <daviddunn@google.com>
Message-Id: <20220223225743.2703915-4-daviddunn@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
David Dunn 2022-02-23 22:57:43 +00:00 committed by Paolo Bonzini
parent f49b8138e6
commit 20e416720e
1 changed files with 33 additions and 0 deletions
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33
tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c
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@ -325,6 +325,37 @@ static void test_not_member_allow_list(struct kvm_vm *vm)
TEST_ASSERT(!count, "Disallowed PMU Event is counting");
}
/*
* Verify that setting KVM_PMU_CAP_DISABLE prevents the use of the PMU.
*
* Note that KVM_CAP_PMU_CAPABILITY must be invoked prior to creating VCPUs.
*/
static void test_pmu_config_disable(void (*guest_code)(void))
{
int r;
struct kvm_vm *vm;
struct kvm_enable_cap cap = { 0 };
r = kvm_check_cap(KVM_CAP_PMU_CAPABILITY);
if (!(r & KVM_PMU_CAP_DISABLE))
return;
vm = vm_create_without_vcpus(VM_MODE_DEFAULT, DEFAULT_GUEST_PHY_PAGES);
cap.cap = KVM_CAP_PMU_CAPABILITY;
cap.args[0] = KVM_PMU_CAP_DISABLE;
TEST_ASSERT(!vm_enable_cap(vm, &cap), "Failed to set KVM_PMU_CAP_DISABLE.");
vm_vcpu_add_default(vm, VCPU_ID, guest_code);
vm_init_descriptor_tables(vm);
vcpu_init_descriptor_tables(vm, VCPU_ID);
TEST_ASSERT(!sanity_check_pmu(vm),
"Guest should not be able to use disabled PMU.");
kvm_vm_free(vm);
}
/*
* Check for a non-zero PMU version, at least one general-purpose
* counter per logical processor, an EBX bit vector of length greater
@ -430,5 +461,7 @@ int main(int argc, char *argv[])
kvm_vm_free(vm);
test_pmu_config_disable(guest_code);
return 0;
}