linux-kernel - Re: [PATCH 3.16 045/305] x86/speculation: Apply IBPB more strictly to avoid cross-process data leak

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Message-ID: <nycvar.YFH.7.76.1902032005040.11598@cbobk.fhfr.pm>
Date:   Sun, 3 Feb 2019 20:05:53 +0100 (CET)
From:   Jiri Kosina <jikos@...nel.org>
To:     Ben Hutchings <ben@...adent.org.uk>
cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        WoodhouseDavid <dwmw@...zon.co.uk>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        SchauflerCasey <casey.schaufler@...el.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 3.16 045/305] x86/speculation: Apply IBPB more strictly
 to avoid cross-process data leak

On Sun, 3 Feb 2019, Ben Hutchings wrote:

> 3.16.63-rc1 review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Jiri Kosina <jkosina@...e.cz>
> 
> commit dbfe2953f63c640463c630746cd5d9de8b2f63ae upstream.

You really want the whole IBPB+STIBP revamp from upstream, otherwise 
you're going to get noticeable performance penalties on some workloads 
with some microcodes.

-- 
Jiri Kosina
SUSE Labs