linux-kernel - Re: [Patch v5 11/16] x86/speculation: Add Spectre v2 app to app protection modes

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Message-ID: <nycvar.YFH.7.76.1811200048480.21108@cbobk.fhfr.pm>
Date:   Tue, 20 Nov 2018 00:49:46 +0100 (CET)
From:   Jiri Kosina <jikos@...nel.org>
To:     Dave Hansen <dave.hansen@...el.com>
cc:     Thomas Gleixner <tglx@...utronix.de>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Andi Kleen <ak@...ux.intel.com>,
        Casey Schaufler <casey.schaufler@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Jon Masters <jcm@...hat.com>,
        Waiman Long <longman9394@...il.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [Patch v5 11/16] x86/speculation: Add Spectre v2 app to app
 protection modes

On Mon, 19 Nov 2018, Dave Hansen wrote:

> > What? IBPB makes tons of sense even without STIBP.
> 
> I'm lost. :)
> 
> I don't think anyone is talking about using STIBP *everywhere* that IBPB
> is in-use.
> 
> We're just guessing that, if anybody is paranoid enough to ask for IBPB,
> *and* they have SMT, they almost certainly want STIBP too.

I think you are not lost :) and this is exactly what makes sense, and what 
Tim's patchset implements.

-- 
Jiri Kosina
SUSE Labs