KVM: arm64: Remap PMUv3 events onto hardware

Use the provided helper to map PMUv3 event IDs onto hardware, if the
driver exposes such a helper. This is expected to be quite rare, and
only useful for non-PMUv3 hardware.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

Author: oupton

arch/arm64/kvm/pmu-emul.c

@@ -589,6 +589,18 @@ static bool kvm_pmu_counter_is_enabled(struct kvm_pmc *pmc)
 	       (__vcpu_sys_reg(vcpu, PMCNTENSET_EL0) & BIT(pmc->idx));
 }
 
+static u64 kvm_map_pmu_event(struct kvm *kvm, u64 eventsel)
+{
+	struct arm_pmu *pmu = kvm->arch.arm_pmu;
+	int hw_event;
+
+	if (!pmu->map_pmuv3_event)
+		return eventsel;
+
+	hw_event = pmu->map_pmuv3_event(eventsel);
+	return (hw_event < 0) ? eventsel : hw_event;
+}
+
 /**
  * kvm_pmu_create_perf_event - create a perf event for a counter
  * @pmc: Counter context
@@ -634,14 +646,14 @@ static void kvm_pmu_create_perf_event(struct kvm_pmc *pmc)
 
 	memset(&attr, 0, sizeof(struct perf_event_attr));
 	attr.type = arm_pmu->pmu.type;
+	attr.config = kvm_map_pmu_event(vcpu->kvm, eventsel);
 	attr.size = sizeof(attr);
 	attr.pinned = 1;
 	attr.disabled = !kvm_pmu_counter_is_enabled(pmc);
 	attr.exclude_user = (u != nsu);
 	attr.exclude_kernel = (p != nsk);
 	attr.exclude_hv = 1; /* Don't count EL2 events */
 	attr.exclude_host = 1; /* Don't count host events */
-	attr.config = eventsel;
 
 	/*
 	 * If counting with a 64bit counter, advertise it to the perf