linux-kernel - Re: [PATCH v2 4/8] x86/spec_ctrl: Add sysctl knobs to enable/disable SPEC

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Date:   Tue, 09 Jan 2018 18:13:33 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Tim Chen <tim.c.chen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Arjan Van De Ven <arjan.van.de.ven@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/8] x86/spec_ctrl: Add sysctl knobs to
 enable/disable SPEC_CTRL feature

On Tue, 2018-01-09 at 09:55 -0800, Tim Chen wrote:
> 
> Thomas,
> 
> I'll be sending an updated patchset with boot option opt in for ibrs
> and leave the control varaible out.  I agree that we can worry about the
> control variable later.

Please base this on the spectre_v2= option that's already in
tip/x86/pti.
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