openstack team mailing list archive

["Daniel P. Berrange" <berrange@xxxxxxxxxx>]

On Wed, Jun 27, 2012 at 02:47:59PM -0600, Jim Fehlig wrote:
> Daniel P. Berrange wrote:
> > On Fri, Jun 22, 2012 at 12:17:11AM +0800, Huang Zhiteng wrote:
> >   
> >> Of course it is possible.  What kind of issue did you run into?
> >>
> >> On Thu, Jun 21, 2012 at 5:52 PM, Wang Li <foxban@xxxxxxxxx> wrote:
> >>     
> >>> hi,all
> >>>
> >>> I need to run virtual machines on Xen Hypervisor in HVM mode,
> >>> is it possible when using libvirt?
> >>>       
> >
> > Actually, this is not currently possible. For reasons I don't
> > know, the libvirt driver currently hardcodes use of paravirtualized
> > guests when connected to Xen hosts. It does not allow use of HVM
> > guests.  There's no particularly good technical reason why it can't
> > be made to work.
> 
> Right.  I've been working on this in my few spare cycles and hope to
> post some patches soon.
> 
> >  There'd need to be a way to tag instance types
> > with HVM vs paravirt, in addition to their architecture.
> 
> I was hoping to just use the vm_mode image property that the XenServer
> folks use.  See option 2 in this mail
> 
> https://lists.launchpad.net/openstack/msg11507.html
> 
> >  The
> > libvirt driver would have to expose whether each host supports
> > paravirt or HVM or both. The schedular would then have to take
> > this into account when placing guests.
> >   
> 
> I posted an RFC patch here that filters hosts based on the vm_mode image
> property and the additional_compute_capabilities flag.  I haven't
> received any comments, so should probably just push this to gerrit.

I'll happily review any patches you send to Gerrit for this.


Daniel
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