MFC 309030,309039,309080,309081,309083

MFC 309030,309039,309080,309081,309083

309030
    hyperv/vmbus: Set a mark on the revoked channel.

    This will be used to fix device detach DEVMETHOD for revoked primary
    channel.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8522

309039
    hyperv/vmbus: Merge free/active locks.

    These functions are only used by management stuffs, so there are
    no needs to introduce extra complexity.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8524

309080
    hyperv/vmbus: Implement orphan support for transaction API

    It will be used to fix the primary channel revocation support.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8525

309081
    hyperv/vmbus: Fix the primary channel revoking on vmbus side.

    Drivers can now use vmbus_chan_{is_revoked,set_orphan,unset_orphan}() and
    vmbus_xact_ctx_orphan() to fix their attach/detach DEVMETHODs for revoked
    primary channels.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8545

309083
    hyperv/vmbus: Fix the multi-channel revoking on vmbus side.

    - Reference count the sub-channel when channel offer message is
      processed, so that immediate rescind message on the same channel
      will not race sub-channel open on driver side.
    - Drop the above reference when sub-channel is closed, this closely
      mimics the hypervisor's reaction when primary channel is closed
      on the VM side.  No drivers use sub-channel after primary channel
      is closed.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8546

git-svn-id: svn://svn.freebsd.org/base/stable/10@310740 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f