On Tue, Jul 07, 2015 at 10:51:45AM +0300, Pavel Fedin wrote: > 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. The domain XML should contain the devices that are there, not just those the user requested. Backwards compatibility could break if older libvirt refused to start the domain with a pcie root. From looking at the code, that does not seem to be the case. Jan
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