** Also affects: linux-azure (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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  [Hyper-V] Drivers: hv: vmbus: Fix ring buffer signaling

Status in linux-azure package in Ubuntu:
Status in linux-azure source package in Xenial:

Bug description:
  Fix bugs in signaling the Hyper-V host when freeing space in the
  host->guest ring buffer:

  1. The interrupt_mask must not be used to determine whether to signal
     on the host->guest ring buffer
  2. The ring buffer write_index must be read (via hv_get_bytes_to_write)
     *after* pending_send_sz is read in order to avoid a race condition
  3. Comparisons with pending_send_sz must treat the "equals" case as
  4. Don't signal if the pending_send_sz feature is not present. Older
     versions of Hyper-V that don't implement this feature will poll.

  Fixes: 03bad714a161 ("vmbus: more host signalling avoidance")

  This patch is on its way upstream but has not yet been accepted into
  char-misc. It should apply to 4.4+ kernels that have taken

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