On Mon, Oct 05, 2020 at 11:11:54 +0200, David Hildenbrand wrote: > On 05.10.20 10:06, Peter Krempa wrote: > > On Fri, Oct 02, 2020 at 11:59:43 -0400, Nico Pache wrote: > >> xml: > >> <devices> > >> <memballoon model='virtio' free-page-reporting='on'/> > > > > according to what you state in the cover-letter this is a > > 'virtio-balloon-pci' feature. We usually put stuff which depends on a > > specific model of the device into the <driver> subelement of the device > > element. > > IIRC, this should work for virtio-balloon-*, including virtio-balloon-ccw. In that case the qemu capability detection should be added also for the ccw version and capability name needs to be modified to not include pci.