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SubjectRe: [tip:x86/pti] x86/retpoline: Fill RSB on context switch for affected CPUs
On Sun, Jan 14, 2018 at 04:05:54PM -0800, Andi Kleen wrote:
> > + if ((!boot_cpu_has(X86_FEATURE_PTI) &&
> > + !boot_cpu_has(X86_FEATURE_SMEP)) || is_skylake_era()) {
> > + setup_force_cpu_cap(X86_FEATURE_RSB_CTXSW);
> > + pr_info("Filling RSB on context switch\n");
> > + }
>
> Missing an option to turn this off.

My earlier patch did this properly by folding it
into the big option parser.

https://marc.info/?l=linux-kernel&m=151578282016915&w=2

-Andi


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