[fedora-virt] info on resize support for virtio disk

hello, I'm using F14+virt-preview repo and I have an f15 guest configured with a virtio disk. I'm trying online resize support for guest disk if in place. So my disk is vda in guest and in guest xml I have: <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source file='/var/lib/libvirt/images/f15_001.img'/> <target dev='vda' bus='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </disk> I extend the disk with qemu-img at host side: qemu-img resize /var/lib/libvirt/images/f15_001.img +1G In guest neither partprobe nor kpartx show any change... I put the xml definition in disk.xml and try to update device from libvirt point of view (my domain id is 4): [root ~]# virsh update-device 4 disk.xml error: Failed to update device from disk.xml error: unsupported configuration: disk bus 'virtio' cannot be updated. Any confirmation of this? Teorically qemu/monitor should support block_resize command for virtio devices too in qemu 0.14.... Is this true but functionality not ported to virsh command yet or other kind of things? Thanks for clarifications Gianluca