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Speeds up PIIX4 which resolves an old TODO. Also makes PIIX4 compatible with Xen which relies on pci_bus_fire_intx_routing_notifier() to be fired. Signed-off-by: Bernhard Beschow <shentey@gmail.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Message-Id: <20231007123843.127151-27-shentey@gmail.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>