From: Colton Lewis <coltonlewis@google.com>
To: kvm@vger.kernel.org
Cc: Alexandru Elisei <alexandru.elisei@arm.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Jonathan Corbet <corbet@lwn.net>,
Russell King <linux@armlinux.org.uk>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
Oliver Upton <oliver.upton@linux.dev>,
Mingwei Zhang <mizhang@google.com>,
Joey Gouly <joey.gouly@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
Mark Rutland <mark.rutland@arm.com>,
Shuah Khan <shuah@kernel.org>,
Ganapatrao Kulkarni <gankulkarni@os.amperecomputing.com>,
James Clark <james.clark@linaro.org>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
linux-perf-users@vger.kernel.org,
linux-kselftest@vger.kernel.org,
Colton Lewis <coltonlewis@google.com>
Subject: [PATCH v7 05/20] perf: arm_pmuv3: Check cntr_mask before using pmccntr
Date: Mon, 4 May 2026 21:17:58 +0000 [thread overview]
Message-ID: <20260504211813.1804997-6-coltonlewis@google.com> (raw)
In-Reply-To: <20260504211813.1804997-1-coltonlewis@google.com>
Check cntr_mask before using pmccntr to ensure it's available. With a
partitioned PMU, there may be instances where pmccntr is being used by
the guest and will ba absent from cntr_mask.
Signed-off-by: Colton Lewis <coltonlewis@google.com>
---
drivers/perf/arm_pmuv3.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/perf/arm_pmuv3.c b/drivers/perf/arm_pmuv3.c
index 1cceb1f614515..7ff3139dda893 100644
--- a/drivers/perf/arm_pmuv3.c
+++ b/drivers/perf/arm_pmuv3.c
@@ -993,6 +993,9 @@ static bool armv8pmu_can_use_pmccntr(struct pmu_hw_events *cpuc,
if (evtype != ARMV8_PMUV3_PERFCTR_CPU_CYCLES)
return false;
+ if (!test_bit(ARMV8_PMU_CYCLE_IDX, cpu_pmu->cntr_mask))
+ return false;
+
/*
* A CPU_CYCLES event with threshold counting cannot use PMCCNTR_EL0
* since it lacks threshold support.
--
2.54.0.545.g6539524ca2-goog
next prev parent reply other threads:[~2026-05-04 21:18 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-04 21:17 [PATCH v7 00/20] ARM64 PMU Partitioning Colton Lewis
2026-05-04 21:17 ` [PATCH v7 01/20] arm64: cpufeature: Add cpucap for HPMN0 Colton Lewis
2026-05-04 21:17 ` [PATCH v7 02/20] KVM: arm64: Reorganize PMU includes Colton Lewis
2026-05-04 21:17 ` [PATCH v7 03/20] KVM: arm64: Reorganize PMU functions Colton Lewis
2026-05-04 21:17 ` [PATCH v7 04/20] perf: arm_pmuv3: Generalize counter bitmasks Colton Lewis
2026-05-04 21:17 ` Colton Lewis [this message]
2026-05-04 21:17 ` [PATCH v7 06/20] perf: arm_pmuv3: Add method to partition the PMU Colton Lewis
2026-05-04 21:18 ` [PATCH v7 07/20] KVM: arm64: Set up FGT for Partitioned PMU Colton Lewis
2026-05-04 21:18 ` [PATCH v7 08/20] KVM: arm64: Add Partitioned PMU register trap handlers Colton Lewis
2026-05-04 21:18 ` [PATCH v7 09/20] KVM: arm64: Set up MDCR_EL2 to handle a Partitioned PMU Colton Lewis
2026-05-04 21:18 ` [PATCH v7 10/20] KVM: arm64: Context swap Partitioned PMU guest registers Colton Lewis
2026-05-04 21:18 ` [PATCH v7 11/20] KVM: arm64: Enforce PMU event filter at vcpu_load() Colton Lewis
2026-05-04 21:18 ` [PATCH v7 12/20] perf: Add perf_pmu_resched_update() Colton Lewis
2026-05-04 21:18 ` [PATCH v7 13/20] KVM: arm64: Apply dynamic guest counter reservations Colton Lewis
2026-05-04 21:18 ` [PATCH v7 14/20] KVM: arm64: Implement lazy PMU context swaps Colton Lewis
2026-05-04 21:18 ` [PATCH v7 15/20] perf: arm_pmuv3: Handle IRQs for Partitioned PMU guest counters Colton Lewis
2026-05-04 21:18 ` [PATCH v7 16/20] KVM: arm64: Detect overflows for the Partitioned PMU Colton Lewis
2026-05-04 21:18 ` [PATCH v7 17/20] KVM: arm64: Add vCPU device attr to partition the PMU Colton Lewis
2026-05-04 21:18 ` [PATCH v7 18/20] KVM: selftests: Add find_bit to KVM library Colton Lewis
2026-05-04 21:18 ` [PATCH v7 19/20] KVM: arm64: selftests: Add test case for Partitioned PMU Colton Lewis
2026-05-04 21:18 ` [PATCH v7 20/20] KVM: arm64: selftests: Relax testing for exceptions when partitioned Colton Lewis
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