linux-kernel - Re: [patch 57/60] x86/mm/kpti: Add Kconfig

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Message-ID: <alpine.DEB.2.20.1712051033010.1676@nanos>
Date:   Tue, 5 Dec 2017 10:34:08 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andy Lutomirski <luto@...nel.org>
cc:     LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Borislav Petkov <bpetkov@...e.de>,
        Greg KH <gregkh@...uxfoundation.org>,
        Kees Cook <keescook@...gle.com>,
        Hugh Dickins <hughd@...gle.com>,
        Brian Gerst <brgerst@...il.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Rik van Riel <riel@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        David Laight <David.Laight@...lab.com>,
        Eduardo Valentin <eduval@...zon.com>, aliguori@...zon.com,
        Will Deacon <will.deacon@....com>,
        Daniel Gruss <daniel.gruss@...k.tugraz.at>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...nel.org>, moritz.lipp@...k.tugraz.at,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Borislav Petkov <bp@...en8.de>, michael.schwarz@...k.tugraz.at,
        richard.fellner@...dent.tugraz.at
Subject: Re: [patch 57/60] x86/mm/kpti: Add Kconfig

On Mon, 4 Dec 2017, Thomas Gleixner wrote:
> On Mon, 4 Dec 2017, Andy Lutomirski wrote:
> > On Mon, Dec 4, 2017 at 6:08 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> > > --- a/security/Kconfig
> > > +++ b/security/Kconfig
> > > @@ -54,6 +54,16 @@ config SECURITY_NETWORK
> > >           implement socket and networking access controls.
> > >           If you are unsure how to answer this question, answer N.
> > >
> > > +config KERNEL_PAGE_TABLE_ISOLATION
> > > +       bool "Remove the kernel mapping in user mode"
> > > +       depends on X86_64 && JUMP_LABEL
> > 
> > select JUMP_LABEL perhaps?
> 
> Silly me. Yes.

Peter just pointed out that we switched everything to cpu_has() which is
using alternatives so jump label is not longer required at all.

Thanks,

	tglx