Comment 10 for bug 790747

@Mathieu, it is sort of related to the whole thing of cleanup_highmap suddenly poking at page table mappings it did not before (on 64bit) and Xen trying to work-around that in a way that changes behaviour on 32bit. We will likely see a partial revert of that upstream. But for the patch you mentioned, that was never added to stable and not in any 10.04.

I don't think we really need to change max_pfn_mapped behaviour for 2.6.32-2.6.35 since the change to cleanup_highmap was reverted from both longterm trees and so Xen does not need to adapt for that. If longterm ever picks up cleanup_highmap, we will need the xen patch we reverted, the patch Mathieu pointed out and the partial revert which I do not see upstream yet.

I just checked and any 2.6.32-33.64 kernel or higher for Lucid should work again. Can someone confirm this?