KVM: arm64: Refine PMU defines for number of counters

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 <[e-mail]>
Reviewed-by: Marc Zyngier <[e-mail]>
Signed-off-by: Rob Herring (Arm) <[e-mail]>
Tested-by: James Clark <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Will Deacon <[e-mail]>

arch/arm64/kvm/pmu-emul.c

···
 	int i;
 	struct kvm_pmu *pmu = &vcpu->arch.pmu;
 
-	for (i = 0; i < ARMV8_PMU_MAX_COUNTERS; i++)
+	for (i = 0; i < KVM_ARMV8_PMU_MAX_COUNTERS; i++)
 		pmu->pmc[i].idx = i;
 }
 
···
 {
 	int i;
 
-	for (i = 0; i < ARMV8_PMU_MAX_COUNTERS; i++)
+	for (i = 0; i < KVM_ARMV8_PMU_MAX_COUNTERS; i++)
 		kvm_pmu_release_perf_event(kvm_vcpu_idx_to_pmc(vcpu, i));
 	irq_work_sync(&vcpu->arch.pmu.overflow_work);
 }
···
 	if (!(kvm_vcpu_read_pmcr(vcpu) & ARMV8_PMU_PMCR_E) || !val)
 		return;
 
-	for (i = 0; i < ARMV8_PMU_MAX_COUNTERS; i++) {
+	for (i = 0; i < KVM_ARMV8_PMU_MAX_COUNTERS; i++) {
 		struct kvm_pmc *pmc;
 
 		if (!(val & BIT(i)))
···
 	if (!kvm_vcpu_has_pmu(vcpu) || !val)
 		return;
 
-	for (i = 0; i < ARMV8_PMU_MAX_COUNTERS; i++) {
+	for (i = 0; i < KVM_ARMV8_PMU_MAX_COUNTERS; i++) {
 		struct kvm_pmc *pmc;
 
 		if (!(val & BIT(i)))

arch/arm64/kvm/pmu.c

···
  */
 #include <linux/kvm_host.h>
 #include <linux/perf_event.h>
+#include <linux/perf/arm_pmu.h>
 #include <linux/perf/arm_pmuv3.h>
 
 static DEFINE_PER_CPU(struct kvm_pmu_events, kvm_pmu_events);
···
 	u64 typer;
 	u32 counter;
 
-	for_each_set_bit(counter, &events, 32) {
+	for_each_set_bit(counter, &events, ARMPMU_MAX_HWEVENTS) {
 		typer = kvm_vcpu_pmu_read_evtype_direct(counter);
 		typer &= ~ARMV8_PMU_EXCLUDE_EL0;
 		kvm_vcpu_pmu_write_evtype_direct(counter, typer);
···
 	u64 typer;
 	u32 counter;
 
-	for_each_set_bit(counter, &events, 32) {
+	for_each_set_bit(counter, &events, ARMPMU_MAX_HWEVENTS) {
 		typer = kvm_vcpu_pmu_read_evtype_direct(counter);
 		typer |= ARMV8_PMU_EXCLUDE_EL0;
 		kvm_vcpu_pmu_write_evtype_direct(counter, typer);

include/kvm/arm_pmu.h

···
 #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 {
···
 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;

include/linux/perf/arm_pmuv3.h

···
 #define __PERF_ARM_PMUV3_H
 
 #define ARMV8_PMU_MAX_GENERAL_COUNTERS	31
-#define ARMV8_PMU_MAX_COUNTERS	32
-
 #define ARMV8_PMU_CYCLE_IDX		31