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sephe
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2016-07-11T04:52:11.651506Z
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hyperv/vmbus: Implement a new set of APIs for post message Hypercall

And use this new APIs for Initial Contact post message Hypercall.
More post message Hypercalls will be converted.

MFC after:	1 week
Sponsored by:	Microsoft OSTC
Differential Revision:	https://reviews.freebsd.org/D6830

END