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

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Message-ID: <20180104185219.wji527snw6xzggak@pd.tnic>
Date:   Thu, 4 Jan 2018 19:52:19 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Dave Hansen <dave.hansen@...el.com>
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>,
        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 6/7] x86/spec_ctrl: Add sysctl knobs to enable/disable
 SPEC_CTRL feature

On Thu, Jan 04, 2018 at 10:36:30AM -0800, Dave Hansen wrote:
> Distros have the tri-state already deployed.

So that's not really a reason.

> Paranoid people want "IBRS always" aka "ibrs 2".

So why not "IBRS always" or off? No need for the "IBRS only in the
kernel" setting.

-- 
Regards/Gruss,
    Boris.

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