Re: [Qemu-devel] [Qemu-ppc] [PATCH 03/15] pseries: Implement qemu initiated shutdowns using EPOW events

[David Gibson]

On Thu, Oct 18, 2012 at 04:50:25PM +1100, David Gibson wrote:
> At present, using 'system_powerdown' from the monitor or otherwise
> instructing qemu to (cleanly) shut down a pseries guest will not work,
> because we did not have a method of signalling the shutdown request to the
> guest.
> 
> PAPR does include a usable mechanism for this, though it is rather more
> involved than the equivalent on x86.  This involves sending an EPOW
> (Environmental and POwer Warning) event through the PAPR event and error
> logging mechanism, which also has a number of other functions.
> 
> This patch implements just enough of the event/error logging functionality
> to be able to send a shutdown event to the guest.  At least with modern
> guest kernels and a userspace that is up and running, this means that
> system_powerdown from the qemu monitor should now work correctly on pseries
> guests.
> 
> Signed-off-by: David Gibson <address@hidden>

Ugh, don't apply this version.  When I applied Blue's changes I didn't
test properly and completely broke it.

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson