xen: xenbus PM events support
Make xenbus frontend device subscribe to PM events to receive suspend/resume/freeze/thaw/restore notifications. Signed-off-by: NKenji Wakamiya <wkenji@jp.fujitsu.com> Signed-off-by: NKazuhiro Suzuki <kaz@jp.fujitsu.com> Signed-off-by: NShriram Rajagopalan <rshriram@cs.ubc.ca> Acked-by: NIan Campbell <ian.campbell@citrix.com> [shriram--minor mods and improved commit message] Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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