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[Marcelo Cerri <1748662@xxxxxxxxxxxxxxxxxx>]

** Changed in: linux-azure (Ubuntu Xenial)
       Status: New => In Progress

** Also affects: linux-azure (Ubuntu Bionic)
   Importance: Undecided
       Status: Confirmed

** Changed in: linux-azure (Ubuntu Xenial)
     Assignee: (unassigned) => Marcelo Cerri (mhcerri)

** Changed in: linux-azure (Ubuntu Bionic)
     Assignee: (unassigned) => Marcelo Cerri (mhcerri)

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https://bugs.launchpad.net/bugs/1748662

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

Status in linux-azure package in Ubuntu:
  Confirmed
Status in linux-azure source package in Xenial:
  In Progress
Status in linux-azure source package in Bionic:
  Confirmed

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
     not-enough-space
  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
  03bad714a161

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