linux-kernel - [PATCH v4 3/6] KVM: selftests: Print detailed info in PMU event filter asserts

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Date:   Fri,  7 Apr 2023 16:32:51 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Aaron Lewis <aaronlewis@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>
Subject: [PATCH v4 3/6] KVM: selftests: Print detailed info in PMU event
 filter asserts

From: Aaron Lewis <aaronlewis@...gle.com>

Provide the actual vs. expected count in the PMU event filter test's
asserts instead of relying on pr_info() to provide the context, e.g. so
that all information needed to triage a failure is readily available even
if the environment in which the test is run captures only the assert
itself.

Signed-off-by: Aaron Lewis <aaronlewis@...gle.com>
[sean: rewrite changelog]
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 .../selftests/kvm/x86_64/pmu_event_filter_test.c      | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

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 9b53e02a0565..ef07aaca2168 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
@@ -246,18 +246,17 @@ static struct kvm_pmu_event_filter *remove_event(struct kvm_pmu_event_filter *f,
 
 #define ASSERT_PMC_COUNTING_INSTRUCTIONS(count)						\
 do {											\
-	if (count != NUM_BRANCHES)							\
+	if (count && count != NUM_BRANCHES)						\
 		pr_info("%s: Branch instructions retired = %lu (expected %u)\n",	\
 			__func__, count, NUM_BRANCHES);					\
-	TEST_ASSERT(count, "Allowed PMU event is not counting.");			\
+	TEST_ASSERT(count, "%s: Branch instructions retired = %lu (expected > 0)",	\
+		    __func__, count);							\
 } while (0)
 
 #define ASSERT_PMC_NOT_COUNTING_INSTRUCTIONS(count)					\
 do {											\
-	if (count)									\
-		pr_info("%s: Branch instructions retired = %lu (expected 0)\n",		\
-			__func__, count);						\
-	TEST_ASSERT(!count, "Disallowed PMU Event is counting");			\
+	TEST_ASSERT(!count, "%s: Branch instructions retired = %lu (expected 0)",	\
+		    __func__, count);							\
 } while (0)
 
 static void test_without_filter(struct kvm_vcpu *vcpu)
-- 
2.40.0.577.gac1e443424-goog