linux-kernel - RE: [RFC 09/10] x86/enter: Create macros to restrict/unrestrict Indirect Branch Speculation

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Date:   Fri, 26 Jan 2018 18:28:41 +0000
From:   "Van De Ven, Arjan" <arjan.van.de.ven@...el.com>
To:     David Woodhouse <dwmw2@...radead.org>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
CC:     "Hansen, Dave" <dave.hansen@...el.com>,
        Liran Alon <liran.alon@...cle.com>,
        Laura Abbott <labbott@...hat.com>,
        Andrew Lutomirski <luto@...nel.org>,
        Janakarajan Natarajan <Janakarajan.Natarajan@....com>,
        Borislav Petkov <bp@...e.de>,
        "Mallick, Asit K" <asit.k.mallick@...el.com>,
        Radim Krcmár <rkrcmar@...hat.com>,
        KarimAllah Ahmed <karahmed@...zon.de>,
        Peter Anvin <hpa@...or.com>,
        "Nakajima, Jun" <jun.nakajima@...el.com>,
        Ingo Molnar <mingo@...hat.com>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        Joerg Roedel <joro@...tes.org>,
        "Andrea Arcangeli" <aarcange@...hat.com>,
        KVM list <kvm@...r.kernel.org>
Subject: RE: [RFC 09/10] x86/enter: Create macros to restrict/unrestrict
 Indirect Branch Speculation

> On Fri, 2018-01-26 at 10:12 -0800, Arjan van de Ven wrote:
> > On 1/26/2018 10:11 AM, David Woodhouse wrote:
> > >
> > > I am *actively* ignoring Skylake right now. This is about per-SKL
> > > userspace even with SMEP, because we think Intel's document lies to us.
> >
> > if you think we lie to you then I think we're done with the conversation?
> >
> > Please tell us then what you deploy in AWS for your customers ?
> >
> > or show us research that shows we lied to you?
> 
> As you know well, I mean "we think Intel's document is not correct".

you asked before and even before you sent the email I confirmed to you that the document is correct

I'm not sure what the point is to then question that again 15 minutes later other than creating more noise.