linux-kernel - Re: [patch 00/60] x86/kpti: Kernel Page Table Isolation (was KAISER)

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Date:   Mon, 4 Dec 2017 13:21:40 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Andy Lutomirsky <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Borislav Petkov <bpetkov@...e.de>,
        Greg KH <gregkh@...uxfoundation.org>,
        Kees Cook <keescook@...gle.com>,
        Hugh Dickins <hughd@...gle.com>,
        Brian Gerst <brgerst@...il.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Rik van Riel <riel@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        David Laight <David.Laight@...lab.com>,
        Eduardo Valentin <eduval@...zon.com>,
        "Liguori, Anthony" <aliguori@...zon.com>,
        Will Deacon <will.deacon@....com>,
        Daniel Gruss <daniel.gruss@...k.tugraz.at>
Subject: Re: [patch 00/60] x86/kpti: Kernel Page Table Isolation (was KAISER)

On 12/04/2017 01:18 PM, Thomas Gleixner wrote:
> On Mon, 4 Dec 2017, Linus Torvalds wrote:
>> On Mon, Dec 4, 2017 at 6:07 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
>>>     Kernel Page Table Isolation, prefix kpti_
>>>
>>>    Linus, your call :)
>> I think you probably chose the right name here. The alternatives sound
>> intriguing, but probably not the right thing to do.
>>
>> How much of this is considered worth trying to integrate early?
> Probably the entry changes, but we need to sort out that fixmap issue first
> and that affects the entry changes as well. Give me a day or two and I can
> tell you.

This series breaks Xen PV.

When I tested it last time it was patch 17 (of this series). I don't
know whether it breaks now due to the same patch, I haven't had a chance
to look into this yet, sorry.

-boris


>> Clearly I'm not taking all of it.
> I did not expect that.
>
> Thanks,
>
> 	tglx