linux-kernel - 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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Date:   Thu, 2 Feb 2017 12:36:11 -0800
From:   Laura Abbott <labbott@...hat.com>
To:     Joseph Salisbury <joseph.salisbury@...onical.com>,
        matt@...eblueprint.co.uk
Cc:     waiman.long@....com, ard.biesheuvel@...aro.org,
        Borislav Petkov <bp@...en8.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>, tytso@....edu,
        Arnd Bergmann <arnd@...db.de>,
        Greg KH <gregkh@...uxfoundation.org>, scott.norton@....com,
        doug.hatch@....com,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-efi@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [REGRESSION][v4.9.y][v4.10.y] x86/efi: Only map RAM into EFI page
 tables if in mixed-mode

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@...eblueprint.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