KVM: x86: Isolate edge vs. level check in userspace I/O APIC route scanning

Extract and isolate the trigger mode check in kvm_scan_ioapic_routes() in
anticipation of moving destination matching logic to a common helper (for
userspace vs. in-kernel I/O APIC emulation).

No functional change intended.

Reviewed-by: Kai Huang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Sean Christopherson <[email protected]>

Author: sean-jc

arch/x86/kvm/irq_comm.c

@@ -424,10 +424,12 @@ void kvm_scan_ioapic_routes(struct kvm_vcpu *vcpu,
 
 			kvm_set_msi_irq(vcpu->kvm, entry, &irq);
 
-			if (irq.trig_mode &&
-			    (kvm_apic_match_dest(vcpu, NULL, APIC_DEST_NOSHORT,
-						 irq.dest_id, irq.dest_mode) ||
-			     kvm_apic_pending_eoi(vcpu, irq.vector)))
+			if (!irq.trig_mode)
+				continue;
+
+			if (kvm_apic_match_dest(vcpu, NULL, APIC_DEST_NOSHORT,
+						irq.dest_id, irq.dest_mode) ||
+			     kvm_apic_pending_eoi(vcpu, irq.vector))
 				__set_bit(irq.vector, ioapic_handled_vectors);
 		}
 	}