Re: [PATCH 0/2] Introduce panic hypercall

Avi Kivity
2011-06-21T08:09:29Z

On 06/21/2011 09:02 AM, Gleb Natapov wrote:
> On Mon, Jun 20, 2011 at 07:34:57PM +0300, Avi Kivity wrote:
> > >The only two things which came to my mind are:
> > >
> > > * NMI (aka. ipmitool diag) - already available in qemu/kvm - but requires
> > > in-guest kexec/kdump
> > > * Hardware-Watchdog (also available in qemu/libvirt)
> >
> > A watchdog has the advantage that is also detects lockups.
> >
> And has disadvantage that all time base heuristics are bite us in the
> end.

The perf-based watchdog counts clocks-not-halted, not time, so it is
safe from time issues. We could make the hardware watchdog cheat in the
same way.

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