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Much like for gnttab and foreignmemory xencall hypercall buffers need care. Evtchn is a bit simpler (no magic mappings) but may not work from parent + child simultaneously, document "parent only" since it is consistent with the others. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Wei Liu <wei.liu2@citrix.com>