[libvirt] [PATCH] qemu: Allow system pages to <memoryBacking/>

[Daniel P. Berrange]

On Fri, Dec 12, 2014 at 11:05:37AM +0100, Michal Privoznik wrote:
> It occurred to me that OpenStack uses the following XML when not using
> regular huge pages:
> 
>   <memoryBacking>
>     <hugepages>
>       <page size='4' unit='KiB'/>
>     </hugepages>
>   </memoryBacking>
> 
> However, since we are expecting to see huge pages only, we fail to
> startup the domain with following error:
> 
>   libvirtError: internal error: Unable to find any usable hugetlbfs
>   mount for 4 KiB

NB, if openstack is doing that, it is a bug - in the 4kb case we
shouldn't be using any of this new XML, because we want to be
targetting older libvirt.

ACK

Regards,
Daniel
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