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Date: Tue, 20 Nov 2018 16:44:30 -0800 From: Tim Chen <tim.c.chen@...ux.intel.com> To: Jiri Kosina <jikos@...nel.org>, Thomas Gleixner <tglx@...utronix.de> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Tom Lendacky <thomas.lendacky@....com>, Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>, Josh Poimboeuf <jpoimboe@...hat.com>, Andrea Arcangeli <aarcange@...hat.com>, David Woodhouse <dwmw@...zon.co.uk>, Andi Kleen <ak@...ux.intel.com>, Dave Hansen <dave.hansen@...el.com>, Casey Schaufler <casey.schaufler@...el.com>, Asit Mallick <asit.k.mallick@...el.com>, Arjan van de Ven <arjan@...ux.intel.com>, Jon Masters <jcm@...hat.com>, Waiman Long <longman9394@...il.com>, Greg KH <gregkh@...uxfoundation.org>, Dave Stewart <david.c.stewart@...el.com>, linux-kernel@...r.kernel.org, x86@...nel.org, stable@...r.kernel.org Subject: Re: [Patch v6 00/16] Provide task property based options to enable Spectre v2 userspace-userspace protection On 11/20/2018 03:59 PM, Tim Chen wrote: > Fix in this version bugs causing build problems for UP configuration. > > Also merged in Jiri's change to extend STIBP for SECCOMP processes and > renaming TIF_STIBP to TIF_SPEC_INDIR_BRANCH. > > I've updated the boot options spectre_v2_app2app to > on, off, auto, prctl and seccomp. This aligns with > the options for other speculation related mitigations. > > I tried to incorporate sched_smt_present to detect when we have all SMT > going offline and we can disable the SMT path, which Peter suggested. > This optimization that can be easily left out of the patch series and > not backported. I've put these two patches at the end and they can be > considered separately. > > I've dropped the TIF flags re-organization patches > as they are not needed in this patch series. > > To do: Create a dedicated document on the mitigation options for Spectre V2. > My apology that the v6 patch series is missing the first two patches in the series. Please ignore v6 and resending the patch series as v7. Tim
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