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Some of the memory listener may want to do log synchronization without being able to specify a range of memory to sync but always globally. Such a memory listener should provide this new method instead of the log_sync() method. Obviously we can also achieve similar thing when we put the global sync logic into a log_sync() handler. However that's not efficient enough because otherwise memory_global_dirty_log_sync() may do the global sync N times, where N is the number of flat ranges in the address space. Make this new method be exclusive to log_sync(). Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <20210506160549.130416-2-peterx@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>