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

Started byJoseph Salisbury <joseph.salisbury@canonical.com>
First post2017-02-02 21:20 +0100
Last post2017-02-02 21:40 +0100
Articles 6 — 4 participants

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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

#1572728 — [REGRESSION][v4.9.y][v4.10.y] x86/efi: Only map RAM into EFI page tables if in mixed-mode

FromJoseph Salisbury <joseph.salisbury@canonical.com>
Date2017-02-02 21:20 +0100
Subject[REGRESSION][v4.9.y][v4.10.y] x86/efi: Only map RAM into EFI page tables if in mixed-mode
Message-ID<t6w1k-eC-21@gated-at.bofh.it>
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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#1572738

FromLaura Abbott <labbott@redhat.com>
Date2017-02-02 21:40 +0100
Message-ID<t6wkF-lW-5@gated-at.bofh.it>
In reply to#1572728
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
> 
> 
> --
> To unsubscribe from this list: send the line "unsubscribe stable" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 
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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#1572745

FromJoseph Salisbury <joseph.salisbury@canonical.com>
Date2017-02-02 21:50 +0100
Message-ID<t6wum-qe-21@gated-at.bofh.it>
In reply to#1572738
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
>>
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe stable" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>
> You might try https://marc.info/?l=linux-kernel&m=148553171703761
> which fixed https://bugzilla.redhat.com/show_bug.cgi?id=1384238
>
> Thanks,
> Laura

Thanks for the suggestion, Laura.  Ard also pointed to the same patch. 
I'll have it tested and report back.


Thanks again,


Joe

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#1573114

FromJoseph Salisbury <joseph.salisbury@canonical.com>
Date2017-02-03 15:20 +0100
Message-ID<t6MSu-2Co-7@gated-at.bofh.it>
In reply to#1572738
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
>>
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe stable" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>
> 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

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#1573254

FromLinus Torvalds <torvalds@linux-foundation.org>
Date2017-02-03 17:40 +0100
Message-ID<t6P3Y-47k-15@gated-at.bofh.it>
In reply to#1573114
On Fri, Feb 3, 2017 at 6:16 AM, Joseph Salisbury
<joseph.salisbury@canonical.com> wrote:
> On 02/02/2017 03:36 PM, Laura Abbott wrote:
>>
>> You might try https://marc.info/?l=linux-kernel&m=148553171703761
>> which fixed https://bugzilla.redhat.com/show_bug.cgi?id=1384238
>
> This patch resolves the bug for multiple users.  Thanks again for the
> pointer, Laura and Ard!

.. and that patch should be in mainline now (and is marked for
stable), having gotten merged with the EFI fixes pull yesterday.

               Linus

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#1572740

FromArd Biesheuvel <ard.biesheuvel@linaro.org>
Date2017-02-02 21:40 +0100
Message-ID<t6wkG-lW-23@gated-at.bofh.it>
In reply to#1572728
On 2 February 2017 at 20:17, Joseph Salisbury
<joseph.salisbury@canonical.com> 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?
>

Does this patch help at all?

https://git.kernel.org/cgit/linux/kernel/git/efi/efi.git/commit/?h=urgent&id=090abfc9dc7faf3f84799f956158c8c3af149a81

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