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

From	Joseph Salisbury <joseph.salisbury@canonical.com>
Newsgroups	linux.kernel
Subject	Re: [REGRESSION][v4.9.y][v4.10.y] x86/efi: Only map RAM into EFI page tables if in mixed-mode
Date	2017-02-03 15:20 +0100
Message-ID	<t6MSu-2Co-7@gated-at.bofh.it> (permalink)
References	<t6w1k-eC-21@gated-at.bofh.it> <t6wkF-lW-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 02/02/2017 03:36 PM, Laura Abbott wrote:
> 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

This patch resolves the bug for multiple users.  Thanks again for the
pointer, Laura and Ard!


Joe

Thread

[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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