linux-kernel - [PATCH AUTOSEL 6.12 228/486] perf: arm_pmuv3: Call kvm_vcpu_pmu_resync

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Message-Id: <20250505223922.2682012-228-sashal@kernel.org>
Date: Mon,  5 May 2025 18:35:04 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: "Rob Herring (Arm)" <robh@...nel.org>,
	Anshuman Khandual <anshuman.khandual@....com>,
	James Clark <james.clark@...aro.org>,
	Will Deacon <will@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	mark.rutland@....com,
	linux-arm-kernel@...ts.infradead.org,
	linux-perf-users@...r.kernel.org
Subject: [PATCH AUTOSEL 6.12 228/486] perf: arm_pmuv3: Call kvm_vcpu_pmu_resync_el0() before enabling counters

From: "Rob Herring (Arm)" <robh@...nel.org>

[ Upstream commit 04bd15c4cbc3f7bd2399d1baab958c5e738dbfc9 ]

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>
Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>
Tested-by: James Clark <james.clark@...aro.org>
Link: https://lore.kernel.org/r/20250218-arm-brbe-v19-v20-1-4e9922fc2e8e@kernel.org
Signed-off-by: Will Deacon <will@...nel.org>
Signed-off-by: Sasha Levin <sashal@...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 0afe02f879b45..d9b56f0f90942 100644
--- a/drivers/perf/arm_pmuv3.c
+++ b/drivers/perf/arm_pmuv3.c
@@ -816,10 +816,10 @@ 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)
-- 
2.39.5