Re: [Qemu-devel] [libvirt] [PATCH/QEMU] s390x/kvm: use cpu_model_available for guarded storage on compat machines

[Christian Borntraeger]

On 10/27/2017 02:45 PM, Christian Borntraeger wrote:
> 
> 
> On 10/27/2017 02:31 PM, Halil Pasic wrote:
> gs is explicitly disabled.
>>
>> Now that I think about it, maybe the 2.9 binary is going to reject
>> the explicit gs flag altogether, because it's unknown.
>>
>> Isn't this a problem? 
> 
> No. This is exactly the _solution_ and not the problem. The target will reject
> unknown cpu features and migration will be aborted. This is exactly what the 
> CPU
> model is for.
FWIW, I think in your particular case the QEMU will reject the z14 cpu and not 
even come
to checking the gs.