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Date: Tue, 5 Dec 2017 10:34:08 +0100 (CET)
From: Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [patch 57/60] x86/mm/kpti: Add Kconfig
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References: <20171204140706.296109558@linutronix.de> <20171204150609.511885345@linutronix.de> <CALCETrVfasJMa_++EB-bFm_MzHAzKqvjRPsaBo2m8YTzRomkxg@mail.gmail.com> <alpine.DEB.2.20.1712041757110.1788@nanos>
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To: Andy Lutomirski <luto@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>, X86 ML <x86@kernel.org>, Linus Torvalds <torvalds@linux-foundation.org>, Peter Zijlstra <peterz@infradead.org>, Dave Hansen <dave.hansen@intel.com>, Borislav Petkov <bpetkov@suse.de>, Greg KH <gregkh@linuxfoundation.org>, Kees Cook <keescook@google.com>, Hugh Dickins <hughd@google.com>, Brian Gerst <brgerst@gmail.com>, Josh Poimboeuf <jpoimboe@redhat.com>, Denys Vlasenko <dvlasenk@redhat.com>, Rik van Riel <riel@redhat.com>, Boris Ostrovsky <boris.ostrovsky@oracle.com>, Juergen Gross <jgross@suse.com>, David Laight <David.Laight@aculab.com>, Eduardo Valentin <eduval@amazon.com>, aliguori@amazon.com, Will Deacon <will.deacon@arm.com>, Daniel Gruss <daniel.gruss@iaik.tugraz.at>, Dave Hansen <dave.hansen@linux.intel.com>, Ingo Molnar <mingo@kernel.org>, moritz.lipp@iaik.tugraz.at, "linux-mm@kvack.org" <linux-mm@kvack.org>, Borislav Petkov <bp@alien8.de>, michael.schwarz@iaik.tugraz.at, richard.fellner@student.tugraz.at

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@linutronix.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

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