K 10
svn:author
V 6
bryanv
K 8
svn:date
V 27
2018-02-19T19:28:24.745122Z
K 7
svn:log
V 182
Add VirtIO bus config_generation method

VirtIO buses (PCI, MMIO) can provide a generation field so a driver
can ensure either a 64-bit or array read was stable.

MFC after:	2 weeks

END