* Borislav Petkov <b...@alien8.de> wrote:
> On Tue, Feb 24, 2015 at 04:07:07PM -0800, Andy Lutomirski wrote:
>
> > I'd prefer a different partial solution: encourage
> > everyone to clear the xstate before making syscalls
> > (using e.g. vzeroall). In fact, maybe user code should
> > aggressively clear newly-unused xstate.
>
> We don't trust userspace.
We certainly don't, but in this case it's a performance
optimization detail: if user-space clears unused xstate in
a way that the CPU recognizes it (for example VZEROALL)
then it might get faster context switches.
Thanks,
Ingo
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