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Re: [Xen-devel] [PATCH] shut down domain when last vCPU goes down

On Fri, Feb 16, 2018 at 03:52:48PM +0000, Roger Pau Monné wrote:
> On Fri, Feb 16, 2018 at 08:10:48AM -0700, Jan Beulich wrote:
> > I've just had to deal with an early boot crash of Linux which occurred
> > so early that even "earlyprintk=xen" did not produce any useful output.
> > Hence the domain appeared to hang, while in fact it had brought down its
> > only vCPU. By translating this to a shutdown, the situation will be
> > better recognizable.
> > 
> > Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> I'm wondering, is it common for a domain to shutdown by shutting down
> all it's vCPUs?
> In the scenario that you describe above it seems it would be more
> helpful to issue a SHUTDOWN_crash instead maybe with a gdprintk
> message in order to aid debugging.

There doesn't seem to be a reliable way to distinguish a crash vs a
guest clean shutdown in you scheme though.


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