Xen 32-bit PV regression

[Boris Ostrovsky]

Steven,

Looks like commit 198d208df (x86: Keep thread_info on thread stack in 
x86_32) broke Xen's 32-bit PV guests.

I poked a little at it and it seems that at least the ifdef in 
xen_cpu_up() needs to be adjusted to set up kernel_stack --- that allows 
CPUs to get going. This is not enough though (not particularly 
surprisingly) and we die a little later with #GPF in xen_iret.

-boris
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