linux-kernel - [PATCH v4 6/6] KVM: selftests: Test gp event filters don't affect fixed event filters

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Date:   Mon, 17 Jul 2023 14:23:43 +0800
From:   Jinrong Liang <ljr.kernel@...il.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Shuah Khan <shuah@...nel.org>,
        Aaron Lewis <aaronlewis@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Vishal Annapurve <vannapurve@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Like Xu <like.xu.linux@...il.com>,
        Jinrong Liang <cloudliang@...cent.com>,
        linux-kselftest@...r.kernel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 6/6] KVM: selftests: Test gp event filters don't affect fixed event filters

From: Jinrong Liang <cloudliang@...cent.com>

Add a test to ensure that setting both generic and fixed performance
event filters does not affect the consistency of the fixed event filter
behavior in KVM.

Signed-off-by: Jinrong Liang <cloudliang@...cent.com>
---
 .../kvm/x86_64/pmu_event_filter_test.c        | 27 +++++++++++++++++++
 1 file changed, 27 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 1872b848f734..b2e432542a8c 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
@@ -835,6 +835,19 @@ static uint64_t test_with_fixed_counter_filter(struct kvm_vcpu *vcpu,
 	return run_vcpu_to_sync(vcpu);
 }
 
+static uint64_t test_set_gp_and_fixed_event_filter(struct kvm_vcpu *vcpu,
+						   uint32_t action,
+						   uint32_t bitmap)
+{
+	struct __kvm_pmu_event_filter f = base_event_filter;
+
+	f.action = action;
+	f.fixed_counter_bitmap = bitmap;
+	do_vcpu_set_pmu_event_filter(vcpu, &f);
+
+	return run_vcpu_to_sync(vcpu);
+}
+
 static void __test_fixed_counter_bitmap(struct kvm_vcpu *vcpu, uint8_t idx,
 					uint8_t nr_fixed_counters)
 {
@@ -861,6 +874,20 @@ static void __test_fixed_counter_bitmap(struct kvm_vcpu *vcpu, uint8_t idx,
 		count = test_with_fixed_counter_filter(vcpu, KVM_PMU_EVENT_DENY,
 						       bitmap);
 		ASSERT_EQ(!!count, !(bitmap & BIT(idx)));
+
+		/*
+		 * Check that fixed_counter_bitmap has higher priority than
+		 * events[] when both are set.
+		 */
+		count = test_set_gp_and_fixed_event_filter(vcpu,
+							   KVM_PMU_EVENT_ALLOW,
+							   bitmap);
+		ASSERT_EQ(!!count, !!(bitmap & BIT(idx)));
+
+		count = test_set_gp_and_fixed_event_filter(vcpu,
+							   KVM_PMU_EVENT_DENY,
+							   bitmap);
+		ASSERT_EQ(!!count, !(bitmap & BIT(idx)));
 	}
 }
 
-- 
2.39.3