tree c44c4eb2f0bc79d92142dd93ca2347bfa5fe7096
parent 3f7565c957c14e4600d471791fca8e534c1ad0b7
author David Gibson <david@gibson.dropbear.id.au> 1326311186 +0000
committer Alexander Graf <agraf@suse.de> 1327119422 +0100

pseries: Use correct dispatcher for PCI config space accesses

The pseries machine expects a para-virtualized guest and so supplies RTAS
functions (via a hypercall) for performing PCI config space access.
Currently the implementation of these calls into
pci_default_{read,write}_config().  However this would be incorrect for
any PCI device which overrides the default config read/write functions.
AFAICT there's only one such device today, but we should still get it
right.  In addition the pci_host_config_{read,write}_common() functions
which do correctly do this dispatch, perform bounds checking on the config
space address, lack of which currently leads to an exploitable bug.

This patch corrects the problem.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>