[PATCH v20 01/11] perf: arm_pmuv3: Call kvm_vcpu_pmu_resync_el0() before enabling counters

From: Rob Herring (Arm)
Date: Tue Feb 18 2025 - 15:54:46 EST


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@xxxxxxxxxx>
Reviewed-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
---
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