Messages in this thread | | | Date | Sun, 14 Jan 2018 16:09:04 -0800 | From | Andi Kleen <> | Subject | Re: [tip:x86/pti] x86/retpoline: Fill RSB on context switch for affected CPUs |
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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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