[libvirt] Non-contiguous NUMA cell numbers

Hi all, libvirt currently doesn't allow you to configure a guest with something like   <cpu>     <topology sockets='2' cores='5' threads='8'/>     <numa>       <cell id='0' cpus='0-39' memory='1048576' unit='KiB'/>       <cell id='16' cpus='40-79' memory='1048576' unit='KiB'/>     </numa>   </cpu> with the following error:   XML error: Exactly one 'cell' element per guest NUMA cell allowed,   non-contiguous ranges or ranges not starting from 0 are not allowed The error message is very specific about not allowing gaps in NUMA cell numbering; however, on the very same host, I have   $ numactl --hard | head -1   available: 4 nodes (0-1,16-17) so gaps in numbering are definitely possible, at least on ppc64. Should we consider relaxing this requirement and allow arbitrarily-numbered NUMA cells? Is there a specific reason why it was forbidden in the first place? Cheers. -- Andrea Bolognani Software Engineer - Virtualization Team