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Subject: Re: [RFC PATCH 00/16] PTI support for x86-32
References: <1516120619-1159-1-git-send-email-joro@8bytes.org>
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From: Dave Hansen <dave.hansen@intel.com>
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Date: Tue, 16 Jan 2018 11:02:28 -0800
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To: Linus Torvalds <torvalds@linux-foundation.org>, Joerg Roedel <joro@8bytes.org>
Cc: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@kernel.org>, "H . Peter Anvin" <hpa@zytor.com>, the arch/x86 maintainers <x86@kernel.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, linux-mm <linux-mm@kvack.org>, Andy Lutomirski <luto@kernel.org>, 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 01/16/2018 10:59 AM, Linus Torvalds wrote:
>> 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.
> .. and please run all the segment and syscall selfchecks that Andy has written.
> 
> But yes, checking bare metal, and checking the "odd" applications like
> Wine and dosemu (and kvm etc) within the PTI kernel is certainly a
> good idea.

I tried to document a list of the "gotchas" that tripped us up during
the 64-bit effort under "Testing":

> https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=x86/pti&id=01c9b17bf673b05bb401b76ec763e9730ccf1376

NMIs were a biggie too.

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