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Subject: Re: [Patch v6 00/16] Provide task property based options to enable
 Spectre v2 userspace-userspace protection
To: Jiri Kosina <jikos@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Tom Lendacky <thomas.lendacky@amd.com>,
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References: <cover.1542757030.git.tim.c.chen@linux.intel.com>
From: Tim Chen <tim.c.chen@linux.intel.com>
Message-ID: <f201f18e-a0df-7c54-7858-e03375786ea2@linux.intel.com>
Date: Tue, 20 Nov 2018 16:44:30 -0800
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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