linux-kernel - [PATCH] KVM: selftests: Test top-down slots event

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Date: Thu,  1 Feb 2024 14:15:05 +0800
From: Dapeng Mi <dapeng1.mi@...ux.intel.com>
To: Sean Christopherson <seanjc@...gle.com>,
	Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Kan Liang <kan.liang@...ux.intel.com>,
	Jim Mattson <jmattson@...gle.com>,
	Jinrong Liang <cloudliang@...cent.com>,
	Aaron Lewis <aaronlewis@...gle.com>,
	Dapeng Mi <dapeng1.mi@...el.com>,
	Dapeng Mi <dapeng1.mi@...ux.intel.com>
Subject: [PATCH] KVM: selftests: Test top-down slots event

Although the fixed counter 3 and the exclusive pseudo slots events is
not supported by KVM yet, the architectural slots event is supported by
KVM and can be programed on any GP counter. Thus add validation for this
architectural slots event.

Top-down slots event "counts the total number of available slots for an
unhalted logical processor, and increments by machine-width of the
narrowest pipeline as employed by the Top-down Microarchitecture
Analysis method." So suppose the measured count of slots event would be
always larger than 0.

pmu_counters_test passed with this patch on Intel Sapphire Rapids.

Signed-off-by: Dapeng Mi <dapeng1.mi@...ux.intel.com>
---
 tools/testing/selftests/kvm/x86_64/pmu_counters_test.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/kvm/x86_64/pmu_counters_test.c b/tools/testing/selftests/kvm/x86_64/pmu_counters_test.c
index ae5f6042f1e8..99bcb619b861 100644
--- a/tools/testing/selftests/kvm/x86_64/pmu_counters_test.c
+++ b/tools/testing/selftests/kvm/x86_64/pmu_counters_test.c
@@ -117,6 +117,7 @@ static void guest_assert_event_count(uint8_t idx,
 		fallthrough;
 	case INTEL_ARCH_CPU_CYCLES_INDEX:
 	case INTEL_ARCH_REFERENCE_CYCLES_INDEX:
+	case INTEL_ARCH_TOPDOWN_SLOTS_INDEX:
 		GUEST_ASSERT_NE(count, 0);
 		break;
 	default:

base-commit: f0f3b810edda57f317d79f452056786257089667
-- 
2.40.1