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From:   Roland Dreier <roland@purestorage.com>
Date:   Fri, 24 Aug 2018 10:08:28 -0700
Message-ID: <CAL1RGDW1Lo+F5D479Jsi-AFsmjVpdDre_qOFSCwWubG6U=bxeQ@mail.gmail.com>
Subject: Re: [PATCH 4.4 103/105] Revert "x86/mm/pat: Ensure cpa->pfn only
 contains page frame numbers"
To:     Ben Hutchings <ben.hutchings@codethink.co.uk>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     LKML <linux-kernel@vger.kernel.org>, stable@vger.kernel.org,
        matt@codeblueprint.co.uk, bp@suse.de,
        Andrew Morton <akpm@linux-foundation.org>,
        Andy Lutomirski <luto@amacapital.net>, luto@kernel.org,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>, bp@alien8.de,
        brgerst@gmail.com, davej@codemonkey.org.uk, dvlasenk@redhat.com,
        "H. Peter Anvin" <hpa@zytor.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Peter Zijlstra <peterz@infradead.org>,
        sai.praneeth.prakhya@intel.com, sds@tycho.nsa.gov,
        Thomas Gleixner <tglx@linutronix.de>, toshi.kani@hp.com,
        linux-efi@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
        Yazen.Ghannam@amd.com
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> See
> <https://lore.kernel.org/lkml/1512686629.18523.217.camel@codethink.co.uk/T/#u>.

Thanks!  I'm not using SGI UV and I'm not using kexec, so I guess I
sidestepped most of those issues.  Greg, I think we need to unrevert
the cpa->pfn change (otherwise the L1TF fix probably gets pretty
messy) and I guess pull in the other patches that Ben mentions.

 - R.