Re: [Xen-devel] CONFIG_XEN_COMPAT_030002 broken?

[Gerd Hoffmann <kraxel@xxxxxxx>]

Keir Fraser wrote:
> 
> Yes, and to allow fewer TLB entries to be flushed when switching between
> guest kernel and guest user. That optimisation is foiled if PAGE_USER is set
> everywhere.

Ok, so the extra cost to decide that at runtime (if
CONFIG_XEN_COMPAT_030002 is set) probably is outweighed by the tlb flush
optimization ...

cheers,
  Gerd

-- 
Gerd Hoffmann <kraxel@xxxxxxx>
http://www.suse.de/~kraxel/julika-dora.jpeg

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