linux-kernel - Re: [RFC PATCH 00/16] PTI support for x86-32

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Date:   Fri, 19 Jan 2018 11:55:28 +0100
From:   Pavel Machek <pavel@....cz>
To:     Joerg Roedel <joro@...tes.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>, Jiri Kosina <jkosina@...e.cz>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Brian Gerst <brgerst@...il.com>,
        David Laight <David.Laight@...lab.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Eduardo Valentin <eduval@...zon.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Will Deacon <will.deacon@....com>, aliguori@...zon.com,
        daniel.gruss@...k.tugraz.at, hughd@...gle.com, keescook@...gle.com,
        Andrea Arcangeli <aarcange@...hat.com>,
        Waiman Long <llong@...hat.com>, jroedel@...e.de
Subject: Re: [RFC PATCH 00/16] PTI support for x86-32

Hi!

> From: Joerg Roedel <jroedel@...e.de>
> 
> Hi,
> 
> 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
  ‘ptdump_walk_user_pgd_level_checkwx’:
  arch/x86/mm/dump_pagetables.c:546:26: error: ‘init_top_pgt’
  undeclared (first use in this function)
    pgd_t *pgd = (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
    
Ok, I guess I can disable some config option...
								Pavel

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

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