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Date:   Fri, 31 Aug 2018 07:24:08 +0100
From:   Guillaume Tucker <>
To:     Guenter Roeck <>,
        Roland Dreier <>
Cc:     Greg Kroah-Hartman <>,
        Ben Hutchings <>,
        LKML <>,,,,
        Andrew Morton <>,
        Andy Lutomirski <>,,
        Ard Biesheuvel <>,,,,,
        "H. Peter Anvin" <>,
        Linus Torvalds <>,
        Peter Zijlstra <>,,,
        Thomas Gleixner <>,,, Ingo Molnar <>,
Subject: Re: [PATCH 4.4 103/105] Revert "x86/mm/pat: Ensure cpa->pfn only
 contains page frame numbers"

On 24/08/18 21:32, Guenter Roeck wrote:
> On Fri, Aug 24, 2018 at 01:16:18PM -0700, Roland Dreier wrote:
>>> Sounds great. I'll hold off with sending my RFT series and wait for your
>>> test results. I think we'll also need d367cef0a7f0c6 ("x86/mm/pat: Fix
>>> boot crash when 1GB pages are not supported by the CPU").
>> Sure, makes sense - I don't have any EFI systems with CPUs old enough
>> not to support 1G pages but that looks reasonable.  I'll pull that
>> into my tree as well.
> kernelci reported a crash on a CPU which doesn't support 1G pages.
> See

Looks like this has now been fixed with Andi's patch in 4.4.153:

  "x86/mm/pat: Fix L1TF stable backport for CPA"

I can confirm this platform is now booting fine in kernelci:


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