Hello! > Is there a way where we would make this configurable? Since the "virt" > machine types use the MMIO bus by default we should make the PCI bus > configurable since not everybody might want to add it actually. What exactly do you mean? In qemu this is not configurable, it's just there. If you don't want to use it, just don't use it. I see no harm done by adding description of it to domain XML. If you just add a device, and don't specify <address type='pci'>, it will default to <address type='virtio-mmio'> as before. Nothing will change regarding old behavior and backwards compatibility. Kind regards, Pavel Fedin Expert Engineer Samsung Electronics Research center Russia -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list