Re: [PULL 33/41] KVM: PPC: Book3S: Move KVM_REG_PPC_WORT to an unused register number

Paolo Bonzini
2014-05-30T15:55:34Z

Il 30/05/2014 17:53, Alexander Graf ha scritto:
>> This is an ABI break, this symbol was added in 3.14. I think I should
>> revert this. Can you convince me otherwise?
>
> There's nothing bad happening with the change. Newer user space won't be
> able to read WORT on older kernels, but there were more things broken
> that just WORT for POWER8 support there ;).
>
> And user space build with new headers running on an old kernel won't
> find the register, which is OK.

Would new userspace with old kernel be able to detect that POWER8
support isn't quite complete?

Paolo