[Bug 231117] bhyve: I/O lockups inside guests

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231117

--- Comment #27 from commit-hook at freebsd.org ---
A commit references this bug:

Author: rgrimes
Date: Sat May 18 19:32:39 UTC 2019
New revision: 347960
URL: https://svnweb.freebsd.org/changeset/base/347960

Log:
  bhyve virtio needs barriers

  Under certain tight race conditions, we found that the lack of a memory
  barrier in bhyve's virtio handling causes it to miss a NO_NOTIFY state
  transition on block devices, resulting in guest stall. The investigation
  is recorded in OS-7613. As part of the examination into bhyve's use of
  barriers, one other section was found to be problematic, but only on
  non-x86 ISAs with less strict memory ordering. That was addressed in
  this patch as well, although it was not at all a problem on x86.

  PR:           231117
  Submitted by: Patrick Mooney <patrick.mooney at joyent.com>
  Reviewed by:  jhb, kib, rgrimes
  Approved by:  jhb
  MFC after:    3 days
  Differential Revision:        https://reviews.freebsd.org/D19501

Changes:
  head/usr.sbin/bhyve/virtio.c

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