To clarify: I don't think this needs fixing for 8.0. Yes, it's a regression on x32. Xen has never worked on x32, this just looks like forgotten case when it needs to be disabled in qemu for x86. It's trivial to work around by adding a --disable argument to configure. And generally I don't know anyone actually running qemu on x32. It's some exotic thing which apparently is going away by its own.
Thanks, /mjt
