CVS commit: src/sys/dev/pci

["Manuel Bouyer" <bouyer%netbsd.org@localhost>]

Module Name:    src
Committed By:   bouyer
Date:           Tue May  5 16:58:11 UTC 2020

Modified Files:
        src/sys/dev/pci: pci_map.c

Log Message:
disable I/O or mem decode before probing BAR size.
Bar size is probed writing 0xffffffff to the BAR and reading back; but while
doing this the decoding address is not guaranteed to be valid and could have
side effect.

Xen PVH enforces disabling decoding before writing to a BAR.

Proposed on tech-kern@, got positive comments


To generate a diff of this commit:
cvs rdiff -u -r1.39 -r1.40 src/sys/dev/pci/pci_map.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.