linux-kernel - Re: [Patch v6 00/16] Provide task property based options to enable Spectre v2 userspace-userspace protection

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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