[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	[REGRESSION][v4.9.y][v4.10.y] x86/efi: Only map RAM into EFI page tables if in mixed-mode
Date	2017-02-02 21:20 +0100
Message-ID	<t6w1k-eC-21@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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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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[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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