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shutdown: Preserve shutdown cause through replay
With the recent addition of ShutdownCause, we want to be able to pass a cause through any shutdown request, and then faithfully replay that cause when later replaying the same sequence. The easiest way is to expand the reply event mechanism to track a series of values for EVENT_SHUTDOWN, one corresponding to each value of ShutdownCause. We are free to change the replay stream as needed, since there are already no guarantees about being able to use a replay stream by any other version of qemu than the one that generated it. The cause is not actually fed back until the next patch changes the signature for requesting a shutdown; a TODO marks that upcoming change. Yes, this uses the gcc/clang extension of a ranged case label, but this is not the first time we've used non-C99 constructs. Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Message-Id: <20170515214114.15442-4-eblake@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
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