[PATCH] KVM: arm/arm64: Access CNTHCTL_EL2 bit fields correctly

[Marc Zyngier]

On 29/11/16 21:05, Jintack Lim wrote:
> On Tue, Nov 29, 2016 at 11:53 AM, Suzuki K Poulose
> <suzuki.poulose at arm.com> wrote:
>> On 29/11/16 09:36, Marc Zyngier wrote:
>>>
>>> On 29/11/16 03:28, Jintack Lim wrote:
>>>>
>>>> On Mon, Nov 28, 2016 at 1:39 PM, Marc Zyngier <marc.zyngier at arm.com>
>>>> wrote:
>>>>>
>>>>> 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.
> 
> Thanks Suzuki. This looks very useful.
> 
> Marc, can I write a patch based on linux-next? The commit which has
> cpus_have_const_cap() is not in master and next branch in kvm/arm
> repo.

You can. It is just that I won't be able to apply it immediately (I'll
wait for -rc1 to be out, and send it as a fix).

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...