linux-kernel - Re: [RFC PATCH v7 12/16] xpfo, mm: remove dependency on CONFIG_PAGE

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Message-ID: <ciirm8k1j4zlxq.fsf@u54ee758033e858cfa736.ant.amazon.com>
Date:   Wed, 16 Jan 2019 16:01:05 +0100
From:   Julian Stecklina <jsteckli@...zon.de>
To:     Khalid Aziz <khalid.aziz@...cle.com>
Cc:     juergh@...il.com, tycho@...ho.ws, ak@...ux.intel.com,
        torvalds@...ux-foundation.org, liran.alon@...cle.com,
        keescook@...gle.com, konrad.wilk@...cle.com,
        deepa.srinivasan@...cle.com, chris.hyser@...cle.com,
        tyhicks@...onical.com, dwmw@...zon.co.uk,
        andrew.cooper3@...rix.com, jcm@...hat.com,
        boris.ostrovsky@...cle.com, kanth.ghatraju@...cle.com,
        joao.m.martins@...cle.com, jmattson@...gle.com,
        pradeep.vincent@...cle.com, john.haxby@...cle.com,
        tglx@...utronix.de, kirill.shutemov@...ux.intel.com, hch@....de,
        steven.sistare@...cle.com, kernel-hardening@...ts.openwall.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org, x86@...nel.org,
        "Vasileios P . Kemerlis" <vpk@...columbia.edu>,
        Juerg Haefliger <juerg.haefliger@...onical.com>,
        Tycho Andersen <tycho@...ker.com>,
        Marco Benatto <marco.antonio.780@...il.com>,
        David Woodhouse <dwmw2@...radead.org>
Subject: Re: [RFC PATCH v7 12/16] xpfo, mm: remove dependency on CONFIG_PAGE_EXTENSION

Khalid Aziz <khalid.aziz@...cle.com> writes:

> From: Julian Stecklina <jsteckli@...zon.de>
>
> Instead of using the page extension debug feature, encode all
> information, we need for XPFO in struct page. This allows to get rid of
> some checks in the hot paths and there are also no pages anymore that
> are allocated before XPFO is enabled.

I have another patch lying around that turns the XPFO per-page locks
into bit spinlocks and thus get the size of struct page to <= 64 byte
again. In case someone's interested, ping me.

Julian