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A guest not reading its Xenstore response buffer fast enough might pile up lots of Xenstore watch events buffered. Reduce the generated load by dropping new events which already have an identical copy pending. The special events "@..." are excluded from that handling as there are known use cases where the handler is relying on each event to be sent individually. This is part of XSA-326. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Julien Grall <jgrall@amazon.com>