The problem was with the real->protected switch of gfxboot, relying on
some stale values in the processor, which is a corner case of x86 which
just can not be efficiently emulated. Xen recently (-unstable tree as of
today, i.e. 3.3) switched to emulating all realmode instructions, so
this is not a problem any more for Xen.

-- 
fancy isolinux screen on install isos hang xen/kvm HVM guests
https://bugs.launchpad.net/bugs/83642
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