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2012-10-29pseries: Implement qemu initiated shutdowns using EPOW eventsDavid Gibson
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 <david@gibson.dropbear.id.au> Signed-off-by: Alexander Graf <agraf@suse.de>