linux-kernel - Re: [Patch v5 12/16] x86/speculation: Create PRCTL interface to restrict indirect branch speculation

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Message-ID: <c16f6107-f58b-b747-1e8d-e7d3c302f0e5@linux.intel.com>
Date:   Mon, 19 Nov 2018 10:29:36 -0800
From:   Tim Chen <tim.c.chen@...ux.intel.com>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        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>,
        Dave Hansen <dave.hansen@...el.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 12/16] x86/speculation: Create PRCTL interface to
 restrict indirect branch speculation

On 11/17/2018 01:53 AM, Jiri Kosina wrote:
> On Fri, 16 Nov 2018, Tim Chen wrote:
> 
> 
> I think that the fact that this talks about "indirect branch predictions" 
> in general terms, but really controls only the SMT aspect of it (STIBP), 
> as quite confusing.
> 
> So I believe it should either be renamed, or actually control semantics of 
> IBPB as well, no?

It does control STIBP.  You have suggestion on an alternative name?

Tim