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Date:   Fri, 19 Jan 2018 11:55:28 +0100
From:   Pavel Machek <pavel@ucw.cz>
To:     Joerg Roedel <joro@8bytes.org>
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@kernel.org>,
        "H . Peter Anvin" <hpa@zytor.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andy Lutomirski <luto@kernel.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>, aliguori@amazon.com,
        daniel.gruss@iaik.tugraz.at, hughd@google.com, keescook@google.com,
        Andrea Arcangeli <aarcange@redhat.com>,
        Waiman Long <llong@redhat.com>, jroedel@suse.de
Subject: Re: [RFC PATCH 00/16] PTI support for x86-32
Message-ID: <20180119105527.GB29725@amd>
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Hi!

> From: Joerg Roedel <jroedel@suse.de>
>=20
> Hi,
>=20
> here is my current WIP code to enable PTI on x86-32. It is
> still in a pretty early state, but it successfully boots my
> KVM guest with PAE and with legacy paging. The existing PTI
> code for x86-64 already prepares a lot of the stuff needed
> for 32 bit too, thanks for that to all the people involved
> in its development :)

Thanks for doing the work.

I tried applying it on top of -next, and that did not succeed. Let me
try Linus tree...

> The code has not run on bare-metal yet, I'll test that in
> the next days once I setup a 32 bit box again. I also havn't
> tested Wine and DosEMU yet, so this might also be broken.

Um. Ok, testing is something I can do. At least I have excuse to power
on T40p.

Ok... Testing is something I can do... If I can get it to compile.

  CC      arch/x86/mm/dump_pagetables.o
  arch/x86/mm/dump_pagetables.c: In function
  =E2=80=98ptdump_walk_user_pgd_level_checkwx=E2=80=99:
  arch/x86/mm/dump_pagetables.c:546:26: error: =E2=80=98init_top_pgt=E2=80=
=99
  undeclared (first use in this function)
    pgd_t *pgd =3D (pgd_t *) &init_top_pgt;
                              ^
			      arch/x86/mm/dump_pagetables.c:546:26:
  note: each undeclared identifier is reported only once for each
  function it appears in
  scripts/Makefile.build:316: recipe for target
  'arch/x86/mm/dump_pagetables.o' failed
  make[2]: *** [arch/x86/mm/dump_pagetables.o] Error 1
  scripts/Makefile.build:575: recipe for target 'arch/x86/mm' failed
  make[1]: *** [arch/x86/mm] Error 2
  make[1]: *** Waiting for unfinished jobs....
    CC      arch/x86/platform/intel/iosf_mbi.o
   =20
Ok, I guess I can disable some config option...
								Pavel

--=20
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo=
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