Hello! > Unfortunately thinking about this some more, the current patch approach might > not be acceptable as is, since current distros as a guest don't support -M > virt with PCI... for example Fedora 21 or 22. How can this be? If qemu version is new enough, virt machine should have a PCI controller. You do not have to supply any extra options, it's just there. It's in mainstream. Or do your distros artificially raise version number? Or are you talking about distros themselves? But... Again, how? Do you have "Generic PCI controller" and virtio-PCI drivers disabled in .config of your kernel? Why? Shouldn't this be fixed then? virtio-PCI has much better performance than virtio-mmio, because you can use vhost-net with irqfds on it. 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