> I can't see how this can work: First, the way the change is 
> done i386 will also use that file (and then
> arch/i386/kernel/swiotlb.c should also be deleted by
> the patch).

That wasn't intentional.  i386 can still use the 
arch/i386 code.

> Second, there's nothing Xen specific anymore in that file, not
> even the contiguous region creation (the sole difference to 
> plain 2.6.20 is the use of virt_to_bus/bus_to_virt). I think
> the first patch should be really just a move of
> arch/i386/kernel/swiotlb.c to lib/swiotlb-xen.c, nothing else.

This should be an improved version of lib/swiotlb.c as 
lib/swiotlb-xen.c, with correct code to make the mappings
contiguous.

-Mark Langsdorf
AMD, Inc.