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Would having an event we push in the bus be sufficient?
I can see about having this added to our nova contributor's work queues.

On Wed, Dec 3, 2014 at 2:19 AM, Daniel P. Berrange <berrange at redhat.com>
wrote:

> On Tue, Dec 02, 2014 at 08:48:52PM -0500, Steve Gordon wrote:
> > ----- Original Message -----
> > > From: "Stefano Maffulli" <stefano at openstack.org>
> > > To: "Daniel P. Berrange" <berrange at redhat.com>,
> Enterprise-wg at lists.openstack.org
> > >
> > > hi Daniel,
> > >
> > > during today's meeting for the Win The Enterprise working group we
> > > noticed libvirtWatchdog. The wiki page
> > > https://wiki.openstack.org/wiki/LibvirtWatchdog is authored by you
> > > originally so I'm reaching out to learn more about the status of this
> > > feature.
> > >
> > > In the WTE team, one of the priorities is to understand the status of
> > > features that allow non-ephemeral (persistent) workloads on OpenStack
> > > (aka the "pet" use case). libvirtWatchdog was mentioned during a
> session
> > > in Paris, saying that it currently supports KVM and Linux guests only.
> > >
> > > What are the plans for its future (can/should it be extended to other
> > > guests/hypervisors)? Who's maintaining it at the moment? Is there any
> > > other documentation besides the wiki page?
> >
> > I'll take a crack at it and then Dan can tell me how wrong I am since
> it's probably my fault it was in the etherpad ;). The watchdog feature in
> OpenStack is exposing capabilities in the underlying Libvirt [1] and Qemu
> [2][3] layers which allow you to attach an i6300esb watchdog device to the
> guest and assign a lifecycle action to take if it is triggered.
> Fundamentally there's nothing preventing other hypervisor projects from
> implementing this, I'm not sure which ones if any actually have however
> (and when I cover the second part of your question below it might become
> clear why).
> >
> > As to why it only works with Linux guests (or more accurately why it
> doesn't work for Windows - I wouldn't be surprised if the BSD family or
> other OSes do support it to some degree but I've never checked) I believe
> it was originally intended to but there were a few issues uncovered during
> the chase, in particular:
> >
> > 1) The default Window's driver for the device only displays the PCI
> information for it (it doesn't actually do anything with the device).
> >
> > 2) The Intel driver for this device on Windows only ever worked with
> 32-bit editions of Windows.
> >
> > 3) The Intel driver for this device on Windows always assumes it's in a
> specific PCI slot.
> >
> > 4) There's no framework within Windows for triggering a watchdog device
> and we weren't able to determine if there were any Windows applications
> capable of  triggering one either.
> >
> > Basically while you can attach the device to a Windows guest for it to
> actually be used it would require someone to write a proper driver for the
> device that works on Windows and there would need to be applications that
> know how to actually make use of it. In the Linux case I believe there is
> wider support for it and it can be triggered by common panics and lockups
> (Rich's blog [3] gives some more examples).
> >
> > For the gorier details see:
> https://bugzilla.redhat.com/show_bug.cgi?id=610063.
>
> Yep, that's pretty much it.
>
> Also note there's a missing feature in Nova in that we have no mechanism
> to notify the end user when a watchdog fires on their VMs. Libvirt has
> this notification ability but we've nowhere to send this info in OpenStack.
> We need some kind of formal alerting system to get a message back to the
> end user (or to an ochestration tool like Heat),  so they can take action
> when it fires.
>
> Regards,
> Daniel
> --
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> :|
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>
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-- 
Jason Venner
Vice President and Chief Architect
Mirantis Inc
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