>       /*
> +      * Temporary hack: zero gs now that we've saved it so that Xen
> +      * doesn't try to reload the old value after changing the GDT
> +      * during the context switch.  This can go away once Xen has
> +      * been taught to only reload %gs when it absolutely must.
> +      */
> +     loadsegment(gs, 0);

Sorry, but i don't really want that unconditionally in the context switch.
Adding a paravirt ops for it would be also ugly. Can Xen be fixed?

-Andi
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