linux-kernel - [PATCH v19 01/11] perf: arm_pmuv3: Call kvm_vcpu_pmu_resync

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Message-Id: <20250202-arm-brbe-v19-v19-1-1c1300802385@kernel.org>
Date: Sun, 02 Feb 2025 18:42:55 -0600
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>, 
 Catalin Marinas <catalin.marinas@....com>, Jonathan Corbet <corbet@....net>, 
 Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, 
 Joey Gouly <joey.gouly@....com>, Suzuki K Poulose <suzuki.poulose@....com>, 
 Zenghui Yu <yuzenghui@...wei.com>, James Clark <james.clark@...aro.org>, 
 Anshuman Khandual <anshuman.khandual@....com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-perf-users@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org, 
 kvmarm@...ts.linux.dev
Subject: [PATCH v19 01/11] perf: arm_pmuv3: Call kvm_vcpu_pmu_resync_el0()
 before enabling counters

Counting events related to setup of the PMU is not desired, but
kvm_vcpu_pmu_resync_el0() is called just after the PMU counters have
been enabled. Move the call to before enabling the counters.

Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
---
 drivers/perf/arm_pmuv3.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/perf/arm_pmuv3.c b/drivers/perf/arm_pmuv3.c
index 0e360feb3432..9ebc950559c0 100644
--- a/drivers/perf/arm_pmuv3.c
+++ b/drivers/perf/arm_pmuv3.c
@@ -825,10 +825,10 @@ static void armv8pmu_start(struct arm_pmu *cpu_pmu)
 	else
 		armv8pmu_disable_user_access();
 
+	kvm_vcpu_pmu_resync_el0();
+
 	/* Enable all counters */
 	armv8pmu_pmcr_write(armv8pmu_pmcr_read() | ARMV8_PMU_PMCR_E);
-
-	kvm_vcpu_pmu_resync_el0();
 }
 
 static void armv8pmu_stop(struct arm_pmu *cpu_pmu)

-- 
2.47.2