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Re: [REGRESSION][v4.9.y][v4.10.y] x86/efi: Only map RAM into EFI page tables if in mixed-mode

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On 02/02/2017 12:17 PM, Joseph Salisbury wrote:
> Hi Matt,
> 
> A kernel bug report was opened against Ubuntu [0].  After a kernel
> bisect, it was found that reverting the following commit resolved this bug:
> 
> commit 1297667083d5442aafe3e337b9413bf02b114edb
> Author: Matt Fleming <matt@codeblueprint.co.uk>
> Date:   Mon Sep 19 13:09:09 2016 +0100
> 
>     x86/efi: Only map RAM into EFI page tables if in mixed-mode
> 
> 
> The regression was introduced as of v4.8-rc8.  It also still affects
> current mainline.
> 
> I was hoping to get your feedback, since you are the patch author.  Do
> you think gathering any additional data will help diagnose this issue,
> or would it be best to submit a revert request?
> 
> 
> Thanks,
> 
> Joe
> 
> [0] http://pad.lv/1659340
> 
> 
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> 
You might try https://marc.info/?l=linux-kernel&m=148553171703761
which fixed https://bugzilla.redhat.com/show_bug.cgi?id=1384238

Thanks,
Laura

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[REGRESSION][v4.9.y][v4.10.y] x86/efi: Only map RAM into EFI page  tables if in mixed-mode Joseph Salisbury <joseph.salisbury@canonical.com> - 2017-02-02 21:20 +0100
  Re: [REGRESSION][v4.9.y][v4.10.y] x86/efi: Only map RAM into EFI page  tables if in mixed-mode Laura Abbott <labbott@redhat.com> - 2017-02-02 21:40 +0100
    Re: [REGRESSION][v4.9.y][v4.10.y] x86/efi: Only map RAM into EFI page  tables if in mixed-mode Joseph Salisbury <joseph.salisbury@canonical.com> - 2017-02-02 21:50 +0100
    Re: [REGRESSION][v4.9.y][v4.10.y] x86/efi: Only map RAM into EFI page  tables if in mixed-mode Joseph Salisbury <joseph.salisbury@canonical.com> - 2017-02-03 15:20 +0100
      Re: [REGRESSION][v4.9.y][v4.10.y] x86/efi: Only map RAM into EFI page  tables if in mixed-mode Linus Torvalds <torvalds@linux-foundation.org> - 2017-02-03 17:40 +0100
  Re: [REGRESSION][v4.9.y][v4.10.y] x86/efi: Only map RAM into EFI page  tables if in mixed-mode Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2017-02-02 21:40 +0100

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