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Subject: Re: [REGRESSION][v4.9.y][v4.10.y] x86/efi: Only map RAM into EFI page
 tables if in mixed-mode
To: Joseph Salisbury <joseph.salisbury@canonical.com>,
        matt@codeblueprint.co.uk
References: <31c63945-fa81-de18-941b-9021f3d9f16c@canonical.com>
Cc: waiman.long@hpe.com, ard.biesheuvel@linaro.org,
        Borislav Petkov <bp@alien8.de>,
        Linus Torvalds <torvalds@linux-foundation.org>, tytso@mit.edu,
        Arnd Bergmann <arnd@arndb.de>, Greg KH <gregkh@linuxfoundation.org>,
        scott.norton@hpe.com, doug.hatch@hpe.com,
        "stable@vger.kernel.org" <stable@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>, x86@kernel.org,
        linux-efi@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>
From: Laura Abbott <labbott@redhat.com>
Message-ID: <d5f1ba6b-06ed-b5b0-1b0e-58d5f385f7c2@redhat.com>
Date: Thu, 2 Feb 2017 12:36:11 -0800
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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