[PATCH] powerpc/kvm: Handle the boundary condition correctly

[Alexander Graf]

On 25.09.2013, at 17:42, Aneesh Kumar K.V wrote:

> 
> Hi Alex,
> 
> "Aneesh Kumar K.V" <aneesh.kumar at linux.vnet.ibm.com> writes:
>>>>> Ok, please give me an example with real numbers and why it breaks.
>>>>> 
>>>>>> 
>>>>>> http://mid.gmane.org/1376995766-16526-4-git-send-email-aneesh.kumar@linux.vnet.ibm.com
>>>>>> 
>>>> 
>>>> Didn't quiet get what you are looking for. As explained before, we now
>>>> need to pass an array with array size 3 even though we know we need to
>>>> read only 2 entries because kernel doesn't loop correctly.
>>> 
>>> But we need to do that regardless, because newer QEMU needs to be able to run on older kernels, no?
>>> 
>> 
>> yes. So use space will have to pass an array of size 3. But that should
>> not prevent us from fixing this right ?
>> 
> 
> Do we still want this patch or should I drop this ?

If we really want it we need to be able to tell user space that we support this feature through a CAP, so that it can act accordingly. Given the additional complexity of this and the fact that we do want to support older KVM versions regardless, I don't think it's worth the hassle.


Alex