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Message-ID: <CALCETrWfetqrcUavH79akLgsMMWjE6JiW9c3OztYTk6Zv_RT1g@mail.gmail.com>
Date: Tue, 16 Jan 2018 14:26:22 -0800
From: Andy Lutomirski <luto@...nel.org>
To: Joerg Roedel <joro@...tes.org>
Cc: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...nel.org>,
"H . Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
LKML <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>,
"Liguori, Anthony" <aliguori@...zon.com>,
Daniel Gruss <daniel.gruss@...k.tugraz.at>,
Hugh Dickins <hughd@...gle.com>,
Kees Cook <keescook@...gle.com>,
Andrea Arcangeli <aarcange@...hat.com>,
Waiman Long <llong@...hat.com>, Joerg Roedel <jroedel@...e.de>
Subject: Re: [RFC PATCH 00/16] PTI support for x86-32
On Tue, Jan 16, 2018 at 8:36 AM, Joerg Roedel <joro@...tes.org> wrote:
> 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 :)
>
> The patches are split as follows:
>
> - 1-3 contain the entry-code changes to enter and
> exit the kernel via the sysenter trampoline stack.
>
> - 4-7 are fixes to get the code compile on 32 bit
> with CONFIG_PAGE_TABLE_ISOLATION=y.
>
> - 8-14 adapt the existing PTI code to work properly
> on 32 bit and add the needed parts to 32 bit
> page-table code.
>
> - 15 switches PTI on by adding the CR3 switches to
> kernel entry/exit.
>
> - 16 enables the Kconfig for all of X86
>
> 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.
>
If you pass all the x86 selftests, then Wine and DOSEMU are pretty
likely to work :)
--Andy
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