Thread (43 messages) 43 messages, 4 authors, 2025-02-18
STALE514d

[PATCH v19 01/11] perf: arm_pmuv3: Call kvm_vcpu_pmu_resync_el0() before enabling counters

From: "Rob Herring (Arm)" <robh@kernel.org>
Date: 2025-02-03 00:43:18
Also in: kvmarm, linux-doc, linux-perf-users, lkml
Subsystem: arm pmu profiling and debugging, the rest · Maintainers: Will Deacon, Mark Rutland, Linus Torvalds

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@kernel.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

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