K 10
svn:author
V 6
emaste
K 8
svn:date
V 27
2022-01-11T18:19:26.680201Z
K 7
svn:log
V 817
Hyper-V: vPCI: Prepopulate device bars

In recent Hyper-V releases on Windows Server 2022, vPCI code does not
initialize the last 4 bit of device bar registers. This behavior change
could result weird problems cuasing PCI code failure when configuring
bars.

Just write all 1's to those bars whose probed values are not the same
as current read ones. This seems to make Hyper-V vPCI and
pci_write_bar() to cooperate correctly on these releases.

Reported by:	khng@freebsd.org
Tested by:	khng@freebsd.org
MFC after:	2 weeks
Sponsored by:	Microsoft

(cherry picked from commit 75412a521f60d4b0393c730ffb284e7c6ff9d2de)
(cherry picked from commit eabea1c700ad8eacb8dc780d8620b59ce72b2cf2)

Approved by:	so
Errata:		FreeBSD-EN-22:03.hyperv

Git Hash:   d5f4d9d5245813f89a64ec6f84eebc025f3e9df9
Git Author: whu@FreeBSD.org
END