Re: [PATCH 4.4 103/105] Revert "x86/mm/pat: Ensure cpa->pfn only contains page frame numbers"

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To: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH 4.4 103/105] Revert "x86/mm/pat: Ensure cpa->pfn only contains page frame numbers"
From: Roland Dreier <roland@xxxxxxxxxxxxxxx>
Date: Fri, 24 Aug 2018 10:08:28 -0700
Cc: LKML <linux-kernel@xxxxxxxxxxxxxxx>, stable@xxxxxxxxxxxxxxx, matt@xxxxxxxxxxxxxxxxxxx, bp@xxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxxxxxx>, luto@xxxxxxxxxx, Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>, bp@xxxxxxxxx, brgerst@xxxxxxxxx, davej@xxxxxxxxxxxxxxxxx, dvlasenk@xxxxxxxxxx, "H. Peter Anvin" <hpa@xxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, sai.praneeth.prakhya@xxxxxxxxx, sds@xxxxxxxxxxxxx, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, toshi.kani@xxxxxx, linux-efi@xxxxxxxxxxxxxxx, Ingo Molnar <mingo@xxxxxxxxxx>, Yazen.Ghannam@xxxxxxx
In-reply-to: <1535129126.2902.36.camel@codethink.co.uk>
References: <20171215092305.994559179@linuxfoundation.org> <20171215092311.347628971@linuxfoundation.org> <CAL1RGDVgShymmT+TJ3mAHEL7n+qoisk6mQ=Tji_T=0d_QA=VKw@mail.gmail.com> <1535129126.2902.36.camel@codethink.co.uk>

> See
> <https://lore.kernel.org/lkml/1512686629.18523.217.camel@xxxxxxxxxxxxxxx/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.

Follow-Ups:
- Re: [PATCH 4.4 103/105] Revert "x86/mm/pat: Ensure cpa->pfn only contains page frame numbers"
  - From: Greg Kroah-Hartman

References:
- [PATCH 4.4 103/105] Revert "x86/mm/pat: Ensure cpa->pfn only contains page frame numbers"
  - From: Greg Kroah-Hartman
- Re: [PATCH 4.4 103/105] Revert "x86/mm/pat: Ensure cpa->pfn only contains page frame numbers"
  - From: Roland Dreier
- Re: [PATCH 4.4 103/105] Revert "x86/mm/pat: Ensure cpa->pfn only contains page frame numbers"
  - From: Ben Hutchings

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