[libvirt] Re: [PATCH] Hardware watchdog patch, version 6

Daniel P. Berrange berrange at redhat.com
Wed Apr 8 14:35:32 UTC 2009

On Wed, Apr 08, 2009 at 09:18:55AM -0500, Anthony Liguori wrote:
> Daniel P. Berrange wrote:
> >On Tue, Apr 07, 2009 at 04:19:42PM -0500, Hollis Blanchard wrote:
> >  
> >>Hi Rich, your watchdog qemu patch is working fine for me (i6300esb,
> >>default reset behavior), but I was wondering... how should libvirt find
> >>out about the watchdog firing?
> >>    
> >
> >This falls into the general problem space of how does QEMU notify its
> >management app  of interesting events. We already really want the
> >ability to be notify of ENOSPC errors in disks, and also would like
> >to know if the VM is paused for any reason outside our control.
> >There have been proposals to just print an async message to the 
> >monitor upon events, that mgmt app could then parse. This is a little
> >fragile though, so for a long term solutiuon we really need the generic
> >libqemumonitor.so type API with formal async notification support.
> >  
> I just posted a patch series that demonstrate how I think it should 
> work.  FWIW, I think notifications are orthogonal to libqemumonitor.so 
> and a non-human monitor mode.

If we get a way to have async events without waiting for libqemumonitor.so
that'd make me very happy :-)

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