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Add the direct-io migration parameter that tells the migration code to use O_DIRECT when opening the migration stream file whenever possible. This is currently only used with the mapped-ram migration that has a clear window guaranteed to perform aligned writes. Acked-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Signed-off-by: Fabiano Rosas <farosas@suse.de>