KVM: arm/arm64: GICv4: Unmap VLPI when freeing an LPI

When freeing an LPI (on a DISCARD command, for example), we need
to unmap the VLPI down to the physical ITS level.
Acked-by: NChristoffer Dall <cdall@linaro.org>
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NChristoffer Dall <christoffer.dall@linaro.org>

virt/kvm/arm/vgic/vgic-its.c

@@ -631,8 +631,12 @@ static void its_free_ite(struct kvm *kvm, struct its_ite *ite)
 	list_del(&ite->ite_list);
 
 	/* This put matches the get in vgic_add_lpi. */
-	if (ite->irq)
+	if (ite->irq) {
+		if (ite->irq->hw)
+			WARN_ON(its_unmap_vlpi(ite->irq->host_irq));
+
 		vgic_put_irq(kvm, ite->irq);
+	}
 
 	kfree(ite);
 }