> This is how TLS is done. Either %gs or %fs are setup so that a  
> prefixed instruction will use the TLS address range.

all the world's a vax.  er, wrong century.  all the world's
an x86.

> The basic idea is: when segment translation is done anyway, let's  
> exploit it and get guest code memory translation/access restriction  
> for free)

i think you misspelled "for the cost of portability".

- erik

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