linux-kernel - Re: [PATCH v2 14/20] mm: Provide speculative fault infrastructure

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Message-ID: <20170828223511.GM28715@tassilo.jf.intel.com>
Date:   Mon, 28 Aug 2017 15:35:11 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Laurent Dufour <ldufour@...ux.vnet.ibm.com>,
        paulmck@...ux.vnet.ibm.com, akpm@...ux-foundation.org,
        mhocko@...nel.org, dave@...olabs.net, jack@...e.cz,
        Matthew Wilcox <willy@...radead.org>, mpe@...erman.id.au,
        paulus@...ba.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, hpa@...or.com,
        Will Deacon <will.deacon@....com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        haren@...ux.vnet.ibm.com, khandual@...ux.vnet.ibm.com,
        npiggin@...il.com, bsingharora@...il.com,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        linuxppc-dev@...ts.ozlabs.org, x86@...nel.org
Subject: Re: [PATCH v2 14/20] mm: Provide speculative fault infrastructure

> That makes me extremely nervous... there could be all sort of
> assumptions esp. in arch code about the fact that we never populate the
> tree without the mm sem.
> 
> We'd have to audit archs closely. Things like the page walk cache
> flushing on power etc...

Yes the whole thing is quite risky. Probably will need some
kind of per architecture opt-in scheme?

-Andi