On Wed, Jan 11, 2023 at 11:00:37PM -0800, Pawan Gupta wrote:
> > SPEC_CTRL_RRSBA_DIS_S is a disable bit and I presume it needs to stay enabled.
>
> The mitigation is enabled when this bit is set. When set, it prevents RET
> target to be predicted from alternate predictors (BTB). This should stay
> 0, unless enabled by a mitigation mode.
>
> > Only when spec_ctrl_disable_kernel_rrsba() runs. And I'd say perf-wise it
> > doesn't cost that much...
>
> I guess this doesn't matter now, because this patch is resetting it by
> default that keeps the mitigation disabled with no perf impact.
Ok, lemme queue it then.
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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