Add bus property to PC machines and use it when looking
for primary PCI root bus (bus 0).
Signed-off-by: NMarcel Apfelbaum <marcel@redhat.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Acked-by: NEduardo Habkost <ehabkost@redhat.com>