Messages in this thread | | | Date | Thu, 12 Jan 2023 11:34:08 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH v3] x86/bugs: Explicitly clear speculative MSR bits |
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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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