K 10
svn:author
V 7
rgrimes
K 8
svn:date
V 27
2019-05-18T19:32:38.755122Z
K 7
svn:log
V 713
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@joyent.com>
Reviewed by:	jhb, kib, rgrimes
Approved by:	jhb
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D19501

END