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KVM: arm64: Refine PMU defines for number of counters

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There are 2 defines for the number of PMU counters:
ARMV8_PMU_MAX_COUNTERS and ARMPMU_MAX_HWEVENTS. Both are the same
currently, but Armv9.4/8.9 increases the number of possible counters
from 32 to 33. With this change, the maximum number of counters will
differ for KVM's PMU emulation which is PMUv3.4. Give KVM PMU emulation
its own define to decouple it from the rest of the kernel's number PMU
counters.

The VHE PMU code needs to match the PMU driver, so switch it to use
ARMPMU_MAX_HWEVENTS instead.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Tested-by: James Clark <james.clark@linaro.org>
Link: https://lore.kernel.org/r/20240731-arm-pmu-3-9-icntr-v3-6-280a8d7ff465@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Rob Herring (Arm)
2024-07-31 10:51:23 -06:00
committed by Will Deacon
parent 126d7d7cce
commit 2f62701fa5
4 changed files with 9 additions and 9 deletions
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include/kvm/arm_pmu.h
+2 -1
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@@ -10,6 +10,7 @@
#include <linux/perf_event.h>
#include <linux/perf/arm_pmuv3.h>
#define KVM_ARMV8_PMU_MAX_COUNTERS 32
#if IS_ENABLED(CONFIG_HW_PERF_EVENTS) && IS_ENABLED(CONFIG_KVM)
struct kvm_pmc {
@@ -25,7 +26,7 @@ struct kvm_pmu_events {
struct kvm_pmu {
struct irq_work overflow_work;
struct kvm_pmu_events events;
struct kvm_pmc pmc[ARMV8_PMU_MAX_COUNTERS];
struct kvm_pmc pmc[KVM_ARMV8_PMU_MAX_COUNTERS];
int irq_num;
bool created;
bool irq_level;