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

[Jintack Lim]

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.

>
>
> Cheers
> Suzuki
>