[PATCH 7/7] KVM: selftests: Test pmu event filter with incompatible kvm_pmu_event_filter

[Jinrong Liang]

From: Jinrong Liang <cloudliang@xxxxxxxxxxx>

Add test to verify the behavior of the pmu event filter when an
incomplete kvm_pmu_event_filter structure is used. By running the
test, we can ensure that the pmu event filter correctly handles
incomplete structures and does not allow events to be counted when
they should not be.

Signed-off-by: Jinrong Liang <cloudliang@xxxxxxxxxxx>
---
 .../kvm/x86_64/pmu_event_filter_test.c        | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c b/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c
index 9be4c6f8fb7e..a6b6e0d086ae 100644
--- a/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c
+++ b/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c
@@ -881,6 +881,24 @@ static bool fixed_ctr_is_allowed(uint8_t idx, uint32_t action, uint32_t bitmap)
 		(action == KVM_PMU_EVENT_DENY && !(bitmap & BIT_ULL(idx)));
 }
 
+struct incompatible_pmu_event_filter {
+	__u32 action;
+	__u32 nevents;
+	__u32 fixed_counter_bitmap;
+};
+
+static uint64_t test_incompatible_filter(struct kvm_vcpu *vcpu, uint32_t action,
+					 uint32_t bitmap)
+{
+	struct incompatible_pmu_event_filter err_f;
+
+	err_f.action = action;
+	err_f.fixed_counter_bitmap = bitmap;
+	ioctl((vcpu->vm)->fd, KVM_SET_PMU_EVENT_FILTER, &err_f.action);
+
+	return run_vcpu_to_sync(vcpu);
+}
+
 static void test_fixed_ctr_action_and_bitmap(struct kvm_vcpu *vcpu,
 					     uint8_t fixed_ctr_idx,
 					     uint8_t max_fixed_num)
@@ -918,6 +936,11 @@ static void test_fixed_ctr_action_and_bitmap(struct kvm_vcpu *vcpu,
 
 			TEST_ASSERT(expected == !!count,
 				    "Fixed event filter does not work as expected.");
+
+			/* Test incompatible event filter works as expected. */
+			count = test_incompatible_filter(vcpu, actions[i], bitmap);
+			TEST_ASSERT(expected == !!count,
+				    "Incompatible filter does not work as expected.");
 		}
 	}
 }
-- 
2.31.1