On Sun, Jun 03, 2012 at 02:22:33AM +0200, Michael Kress wrote:
<features> <acpi/><apic/><pae/> </features>
What was hard though, was to add those features later in the xml, even installing acpid wasn't any use, had to reinstall with the above procedure. But now I know how to proceed.
What you might have been able to do was copy the existing XML to /tmp and edit the copy. Then "virsh destroy" the existing instance, then "virsh define" from the tmp file.
Or else use virt-manager which shows toggle options for these.