MFC 297142,297143,297176,297177,297178,297221

MFC 297142,297143,297176,297177,297178,297221

297142
    hyperv: Factor out snprinf_hv_guid()

    Submitted by:       Ju Sun <junsu microsoft com>
    Reviewed by:        Dexuan Cui <decui microsoft com>, sephe
    MFC after:  1 week
    Sponsored by:       Microsoft OSTC
    Differential Revision:      https://reviews.freebsd.org/D5651

297143
    hyperv/vmbus: Implement bus_child_pnpinfo_str method

    Submitted by:       Jun Su <junsu microsoft com>
    Sponsored by:       Microsoft OSTC
    Differential Revision:      https://reviews.freebsd.org/D5669

297176
    hyperv/evttimer: Use an independent message slot so that it can work

    Using the same message slot as the other types of the messages has
    the side effect that the event timer message could be deferred to
    the swi threads to run (lacking of trapframe and the original code
    didn't even handle that, so the event timer was actually broken).

    As of this commit we use an independent message slot for event timer,
    so that we could handle all of event timer messages in the interrupt
    handler directly.  Note, the message slot for event timer is still
    bind to the same interrupt vector as the other types of messages.

    Submitted by:       Jun Su <junsu microsoft com>
    Reviewed by:        sephe
    Discussed with: Jun Su <junsu microsoft com>, Dexuan Cui <decui microsoft com>
    MFC after:  1 week
    Sponsored by:       Microsoft OSTC
    Differential Revision:      https://reviews.freebsd.org/D5696

297177
    hyperv/vmbus: Use taskqueue_fast for non-performance critical messages

    This gets rid of the per-cpu SWIs.

    Submitted by:       Jun Su <junsu microsoft com>
    Reviewed by:        Dexuan Cui <decui microsoft com>, sephe
    MFC after:  1 week
    Sponsored by:       Microsoft OSTC
    Differential Revision:      https://reviews.freebsd.org/D5215

297178
    hyperv/vmbus: Remove NULL check for taskqueue_create_fast(M_WAITOK)

    Submitted by:       Jun Su <junsu microsoft com>
    Reviewed by:        Dexuan Cui <decui microsoft com>, sephe
    MFC after:  1 week
    Sponsored by:       Microsoft OSTC
    Differential Revision:      https://reviews.freebsd.org/D5215

297221
    hyperv/vmbus: Create per-cpu fast taskqueue for msg handling

    Using one taskqueue does not work, since the EOM MSR must be written
    on the msg's owner CPU.

    Noticed by: Jun Su <junsu microsoft com>
    Discussed with:     Jun Su <junsu microsoft com>, Dexuan Cui <decui microsoft com>
    MFC after:  1 week
    Sponsored by:       Microsoft OSTC

git-svn-id: svn://svn.freebsd.org/base/stable/10@301946 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f