I did a little work on netback and balloon to get them to compile for ia64. (netfront compiles without changes) The attached patch on top of xen-unstable cset 7963 will compile. A few notes:

1) The resulting linux uses Xen-specific alloc_skb and __dev_alloc_skb so this will NOT be transparently paravirtualizable. (It could be done with changes to the x86 sparse files; I haven't done it.) 2) The resulting code isn't intended to work, just to compile. It should identify the vast majority of arch-dep lines in the netback/balloon code, but may entirely miss other code that will need semantic changes to get networking working. 3) Because there are so many (25) "ifdef __ia64__" it's unlikely this would be accepted into the Xen tree. More work needs to be done first. 4) It might be possible (using the now-unused ia64 patch file mechanism) to shoehorn this code into the tree.

Dan