linux-kernel - Re: [patch RFC 5/5] x86/speculation: Add basic speculation control code

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Message-ID: <nycvar.YFH.7.76.1801101409250.11852@cbobk.fhfr.pm>
Date:   Wed, 10 Jan 2018 14:10:10 +0100 (CET)
From:   Jiri Kosina <jikos@...nel.org>
To:     Andrea Arcangeli <aarcange@...hat.com>
cc:     David Woodhouse <dwmw2@...radead.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...uxfoundation.org>, x86@...nel.org,
        Borislav Petkov <bp@...en8.de>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Arjan Van De Ven <arjan.van.de.ven@...el.com>
Subject: Re: [patch RFC 5/5] x86/speculation: Add basic speculation control
 code

On Wed, 10 Jan 2018, Andrea Arcangeli wrote:

> Which in current silicon IBP speculation is turned off always, 

So this is clearly the source of confusion.

If that's the case, what you are saying makes sense. Where is this 
information coming from? It definitely is not in the Intel documentation 
I've seen.

Thanks,

-- 
Jiri Kosina
SUSE Labs