Hi,

There is a problem with the virtual framebuffer: The page directory in
the shared page (xenfb_page->pd[]) is unsigned long and thus has
different sizes on 32bit and 64bit.  The alignment is different too. And
on top of that the frontend driver doesn't clear the shared page, which
makes it difficult to autodetect the bitsize.  I've tried nevertheless,
patch (untested!) attached for comments.  In the long run this code is
supposed to be replaced by grant tables anyway, so it is probably okay
to live with the hack for the time being.  We could of course also fix
the struct if we can afford breaking the interface.  As it is quite new
and probably (hmm, does fc6 ship it?) not widely used yet that might be
an option.

cheers,
  Gerd