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

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Date:   Sat, 6 Jan 2018 21:34:01 +0000
From:   "Van De Ven, Arjan" <arjan.van.de.ven@...el.com>
To:     Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Thomas Gleixner <tglx@...utronix.de>
CC:     "Hansen, Dave" <dave.hansen@...el.com>,
        Konrad Rzeszutek Wilk <konrad@...nel.org>,
        Tim Chen <tim.c.chen@...ux.intel.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>,
        David Woodhouse <dwmw@...zon.co.uk>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 4/8] x86/spec_ctrl: Add sysctl knobs to
 enable/disable SPEC_CTRL feature

> I agree. But this is what customers are told to inspect to see if they
> are impacted. And if in the future versions this goes away or such - they
> will freak out and cause needless escalations.


it's a mistake though... retpoline is what people should be using ....
... and only in super exception cases should IBRS even be considered