Just a minor nit on the comment:

On Mon, Jan 30, 2012 at 6:18 AM, Michael S. Tsirkin [off-list ref] wrote:

Some architectures need to override the way
IO port mapping is does not PCI devices.

Should this line read "IO port mapping is done on PCI devices."?

Supply a generic function that calls
ioport_map, and make it possible for architectures
to override.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

Shane