[libvirt] qemu driver fails to load on Xen after be0782e1

[Daniel P. Berrange]

On Tue, Aug 05, 2014 at 11:16:53AM -0600, Jim Fehlig wrote:
> Jim Fehlig wrote:
> > Until recently, the qemu driver has always succeeded in loading even on
> > a system booted to Xen.  Commit be0782e1 broke this, hence libvirtd no
> > longer loads
> >
> > xendom0 # /usr/sbin/libvirtd -l
> > 2014-08-04 22:27:31.586+0000: 35859: info : libvirt version: 1.2.8
> > 2014-08-04 22:27:31.586+0000: 35859: error :
> > virFileGetDefaultHugepageSize:2958 : internal error: Unable to parse
> > /proc/meminfo
> > 2014-08-04 22:27:31.586+0000: 35859: error : virStateInitialize:749 :
> > Initialization of QEMU state driver failed: internal error: Unable to
> > parse /proc/meminfo
> > 2014-08-04 22:27:31.586+0000: 35859: error : daemonRunStateInit:922 :
> > Driver state initialization failed
> >
> > Problem is the Xen kernel does not provide any huge page info in
> > /proc/meminfo
> >
> > xendom0 # cat /proc/meminfo | grep -i huge
> > xendom0 #
> >   
> 
> BTW, I think this would be the case for any kernel with
> CONFIG_HUGETLB_PAGE turned off.

Yes, we should be robust to this situation.

> > Michal, short of always building with '--without-qemu' on a Xen system,
> > is it possible to make detection of huge pages less fatal wrt loading
> > the qemu driver?
> >   
> 
> E.g. assume zero/default for entries not present?

If the dirs / files don't exist, we should just not report any huge
page info at all.

Regards,
Daniel
-- 
|: http://berrange.com      -o-    http://www.flickr.com/photos/dberrange/ :|
|: http://libvirt.org              -o-             http://virt-manager.org :|
|: http://autobuild.org       -o-         http://search.cpan.org/~danberr/ :|
|: http://entangle-photo.org       -o-       http://live.gnome.org/gtk-vnc :|