On 29/11/16 09:36, Marc Zyngier wrote:

On 29/11/16 03:28, Jintack Lim wrote:

quoted

On Mon, Nov 28, 2016 at 1:39 PM, Marc Zyngier [off-list ref] wrote:

quoted

On 28/11/16 17:43, Marc Zyngier wrote:

This looks much cleaner than my patch.
While we are at it, is it worth to consider that we just need to set
those bits once for VHE case, not for every world switch as an
optimization?

Ah! That's a much better idea indeed! And we could stop messing with
cntvoff_el2 as well, as it doesn't need to be restored to zero on exit.
Could you try and respin something along those lines?

fyi, we have a static_key based cpus_have_const_cap() for Constant cap
checking (like this case) available in linux-next. May be you could make use
of that instead of alternatives.


Cheers
Suzuki