Hi, squeeze host, winxp guest. guest fails to start: PCI: devfn 24 not available fpr virtio-net-pci, in use by virtio-blk-pci Error initializing virtio-net-pci xml-File: ======== <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source file='/var/lib/winxp'/> <target dev='hda' bus='ide'/> <address type='drive' controller='0' bus='0' unit='0'/> </disk> this added: <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source file='/var/lib/winxp-d'/> <target dev='hdb' bus='virtio'/> <address type='drive' controller='0' bus='0' unit='1'/> </disk> root@squeeze64:~# lsmod | grep virt virtio_balloon 2961 0 virtio_net 10573 0 virtio_blk 4225 0 virtio_pci 5511 0 virtio_ring 3258 1 virtio_pci virtio 3309 4 virtio_balloon,virtio_net,virtio_blk,virtio_pci root@squeeze64:~# dpkg -l | egrep "kvm|qemu|virt" ii etherboot-qemu 5.4.4-9 Bootstrapping for various network adapters (qemu) ii gvfs 1.6.4-3 userspace virtual filesystem - server ii kvm 1:0.12.5+dfsg-5+squeeze8 dummy transitional package from kvm to qemu-kvm ii libvirt-bin 0.8.3-5+squeeze2 the programs for the libvirt library ii libvirt0 0.8.3-5+squeeze2 library for interfacing with different virtualization systems ii python-libvirt 0.8.3-5+squeeze2 libvirt Python bindings ii qemu 0.12.5+dfsg-3squeeze1 fast processor emulator ii qemu-keymaps 0.12.5+dfsg-3squeeze1 QEMU keyboard maps ii qemu-kvm 0.12.5+dfsg-5+squeeze8 Full virtualization on x86 hardware ii qemu-system 0.12.5+dfsg-3squeeze1 QEMU full system emulation binaries ii qemu-user 0.12.5+dfsg-3squeeze1 QEMU user mode emulation binaries ii qemu-utils 0.12.5+dfsg-3squeeze1 QEMU utilities ii virt-manager 0.8.4-8 desktop application for managing virtual machines ii virt-viewer 0.2.1-1 Displaying the graphical console of a virtual machine ii virtinst 0.500.3-2 Programs to create and clone virtual machines I sucessfully added a virtio NIC: <interface type='bridge'> <mac address='52:54:00:a6:fb:ab'/> <source bridge='br0'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> an I installed the driver from red hat "virtio-win-0.1-22.iso". But adding a virtio disk fails. any ideas? Ekkard