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Seems like an attribute that could be added to instance types / flavors
that could be passed on to the scheduler and virt layers.

Nate
On Jun 21, 2012 2:12 PM, "Daniel P. Berrange" <berrange at redhat.com> 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 at gmail.com> 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. There'd need to be a way to tag instance types
> with HVM vs paravirt, in addition to their architecture. 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.
>
> Until this is done, if you really need to run HVM guests, then
> you'll have to use KVM  instead of Xen.
>
> Regards,
> Daniel
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