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

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Message-ID: <46157295-e32e-5c9e-0c8b-f91b34f7b02d@linux.intel.com>
Date:   Mon, 8 Jan 2018 09:28:12 -0800
From:   Tim Chen <tim.c.chen@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        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>,
        David Woodhouse <dwmw@...zon.co.uk>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/8] x86/spec_ctrl: Add sysctl knobs to enable/disable
 SPEC_CTRL feature

On 01/08/2018 08:14 AM, Peter Zijlstra wrote:
> On Mon, Jan 08, 2018 at 01:47:07PM +0100, Peter Zijlstra wrote:
>>> a good suggestion, but we encountered some issues with it either
>>> crashing the kernel at boot or not properly turning on/off.
> 
> The below boots, but I lack stuff to test the enabling.

Peter,

Thanks.  Will give it a spin.  One other concern is if
JUMP_LABEL is not configured, this may not work, and
we may still need fall back to a control variable.

Tim