K 10
svn:author
V 5
chuck
K 8
svn:date
V 27
2020-06-29T00:31:24.089336Z
K 7
svn:log
V 492
bhyve: add locks around NVMe queue accesses

The NVMe code attempted to ensure thread safety through a combination of
using atomics and a "busy" flag. But this approach leads to unavoidable
race conditions.

Fix is to use per-queue mutex locks to ensure thread safety within the
queue processing code. While in the neighborhood, move all the queue
initialization code to a common function.

Tested by:	Jason Tubnor
MFC after:	2 weeks
Differential Revision: https://reviews.freebsd.org/D19841

END