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

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Date:   Wed, 10 Jan 2018 13:53:42 +0000
From:   "Van De Ven, Arjan" <arjan.van.de.ven@...el.com>
To:     Andrea Arcangeli <aarcange@...hat.com>
CC:     David Woodhouse <dwmw2@...radead.org>,
        Jiri Kosina <jikos@...nel.org>,
        "Mallick, Asit K" <asit.k.mallick@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        "Linus Torvalds" <torvalds@...uxfoundation.org>,
        "x86@...nel.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>
Subject: RE: [patch RFC 5/5] x86/speculation: Add basic speculation control
 code

> ibrs_enabled 2:
> 
> sets IBRS always in host

this is not secure

> This matches the semantics described here by Tim patchset on lkml:
> 
> https://marc.info/?l=linux-kernel&m=151520606320646

I will talk to Tim, it's not right.


 
> I can tell in practice it works as I described in all microcodes
> I tested.

have you tested all 80 ?