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Date: Fri, 19 Jan 2018 10:57:51 +0100
From: Joerg Roedel <joro@8bytes.org>
Subject: Re: [PATCH 08/16] x86/pgtable/32: Allocate 8k page-tables when PTI
 is enabled
Message-ID: <20180119095751.GA28161@8bytes.org>
References: <1516120619-1159-1-git-send-email-joro@8bytes.org>
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 <CALCETrU1HOJa6i5aLjEBPjw6B6KmzBXCig9m-iawVt63P1ZpUQ@mail.gmail.com>
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To: Andy Lutomirski <luto@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@kernel.org>, "H . Peter Anvin" <hpa@zytor.com>, X86 ML <x86@kernel.org>, LKML <linux-kernel@vger.kernel.org>, Linux-MM <linux-mm@kvack.org>, Linus Torvalds <torvalds@linux-foundation.org>, Dave Hansen <dave.hansen@intel.com>, Josh Poimboeuf <jpoimboe@redhat.com>, Juergen Gross <jgross@suse.com>, Peter Zijlstra <peterz@infradead.org>, Borislav Petkov <bp@alien8.de>, Jiri Kosina <jkosina@suse.cz>, Boris Ostrovsky <boris.ostrovsky@oracle.com>, Brian Gerst <brgerst@gmail.com>, David Laight <David.Laight@aculab.com>, Denys Vlasenko <dvlasenk@redhat.com>, Eduardo Valentin <eduval@amazon.com>, Greg KH <gregkh@linuxfoundation.org>, Will Deacon <will.deacon@arm.com>, "Liguori, Anthony" <aliguori@amazon.com>, Daniel Gruss <daniel.gruss@iaik.tugraz.at>, Hugh Dickins <hughd@google.com>, Kees Cook <keescook@google.com>, Andrea Arcangeli <aarcange@redhat.com>, Waiman Long <llong@redhat.com>, Joerg Roedel <jroedel@suse.de>

On Wed, Jan 17, 2018 at 03:43:14PM -0800, Andy Lutomirski wrote:
> On Tue, Jan 16, 2018 at 8:36 AM, Joerg Roedel <joro@8bytes.org> wrote:
> >  #ifdef CONFIG_X86_PAE
> >  .globl initial_pg_pmd
> >  initial_pg_pmd:
> >         .fill 1024*KPMDS,4,0
> > +       .fill PTI_USER_PGD_FILL,4,0
> 
> Couldn't this be simplified to just .align PGD_ALIGN, 0 without the .fill?

You are right, will change that.

Thanks,

	Joerg

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