linux-kernel - Re: [PATCH 6/7] x86/spec_ctrl: Add sysctl knobs to enable/disable SPEC

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Date:   Thu, 4 Jan 2018 10:54:38 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Andrea Arcangeli <aarcange@...hat.com>,
        Borislav Petkov <bp@...en8.de>
Cc:     Tim Chen <tim.c.chen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Arjan Van De Ven <arjan.van.de.ven@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/7] x86/spec_ctrl: Add sysctl knobs to enable/disable
 SPEC_CTRL feature

On 01/04/2018 10:38 AM, Andrea Arcangeli wrote:
>> And then, if at all, this needs to be connected to the retpolines fun,
>> methinks, so that it can be decided at boot what to use.
Yes, we need to reconcile this with the retpoline.  I've tried to
capture what we do where in here:

> https://docs.google.com/document/d/e/2PACX-1vSMrwkaoSUBAFc6Fjd19F18c1O9pudkfAY-7lGYGOTN8mc9ul-J6pWadcAaBJZcVA7W_3jlLKRtKRbd/pub

Any feedback on this, especially on the CPUs that aren't specifically
covered would be welcome.