On Wed, 10 Jan 2018, Van De Ven, Arjan wrote:
> > So here is the simple list of questions all to be answered with YES or
> > NO. I don't want to see any of the 'but, though ...'. We all know by now
> > that it's CPU dependent and slow and whatever and that IBRS_ATT will be in
> > future CPUs. So get your act together and tell a clear YES or NO.
> > 2) Does toggle mode of IBRS require retpoline ?
>
> NO
>
> >
> > 3) Does toggle mode of IBRS require RSB stuffing ?
>
> Only for the VM exit case
Ok.
> >
> > 4) Exist CPUs which require IBRS to be selected automatically ?
>
> I do not understand your question exactly
Whether the kernel should enable IBRS by default on certain models. And if
yes, which ones.
Thanks,
tglx
