KVM: x86/pmu: Move .hw_event_available() check out of PMC filter helper

Move the call to kvm_x86_pmu.hw_event_available(), which has nothing to
with the userspace PMU filter, out of check_pmu_event_filter() and into
its sole caller pmc_event_is_allowed().  pmc_event_is_allowed() didn't
exist when commit 7aadaa9 ("KVM: x86/pmu: Drop amd_event_mapping[]
in the KVM context"), so presumably the motivation for invoking
.hw_event_available() from check_pmu_event_filter() was to avoid having
to add multiple call sites.

Link: https://lore.kernel.org/r/20230607010206.1425277-5-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: sean-jc

arch/x86/kvm/pmu.c

@@ -382,9 +382,6 @@ static bool check_pmu_event_filter(struct kvm_pmc *pmc)
 	struct kvm_x86_pmu_event_filter *filter;
 	struct kvm *kvm = pmc->vcpu->kvm;
 
-	if (!static_call(kvm_x86_pmu_hw_event_available)(pmc))
-		return false;
-
 	filter = srcu_dereference(kvm->arch.pmu_event_filter, &kvm->srcu);
 	if (!filter)
 		return true;
@@ -398,6 +395,7 @@ static bool check_pmu_event_filter(struct kvm_pmc *pmc)
 static bool pmc_event_is_allowed(struct kvm_pmc *pmc)
 {
 	return pmc_is_globally_enabled(pmc) && pmc_speculative_in_use(pmc) &&
+	       static_call(kvm_x86_pmu_hw_event_available)(pmc) &&
 	       check_pmu_event_filter(pmc);
 }