linux-kernel - Re: [REGRESSION] EFI mixed mode patch triggers boot failure

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Date:   Wed, 19 Oct 2016 14:13:00 -0700
From:   Laura Abbott <labbott@...hat.com>
To:     Matt Fleming <matt@...eblueprint.co.uk>
Cc:     "x86@...nel.org" <x86@...nel.org>, linux-kernel@...r.kernel.org,
        linux-efi@...r.kernel.org, Justin Forbes <jforbes@...hat.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: Re: [REGRESSION] EFI mixed mode patch triggers boot failure

On 10/19/2016 01:04 PM, Laura Abbott wrote:
> Hi,
>
> Fedora received a bug report https://bugzilla.redhat.com/show_bug.cgi?id=1384238
> of a bootup failure with stable 4.7.6. efi=noruntime fixed the bootup problem.
> 1297667083d5442aafe3e337b9413bf02b114edb was linked as the cause
> of the problem.
>
>
> x86/efi: Only map RAM into EFI page tables if in mixed-mode
>
> Waiman reported that booting with CONFIG_EFI_MIXED enabled on his
> multi-terabyte HP machine results in boot crashes, because the EFI
> region mapping functions loop forever while trying to map those
> regions describing RAM.
>
> While this patch doesn't fix the underlying hang, there's really no
> reason to map EFI_CONVENTIONAL_MEMORY regions into the EFI page tables
> when mixed-mode is not in use at runtime.
>
> Reported-by: Waiman Long <waiman.long@....com>
> Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> CC: Theodore Ts'o <tytso@....edu>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Scott J Norton <scott.norton@....com>
> Cc: Douglas Hatch <doug.hatch@....com>
> Cc: <stable@...r.kernel.org> # v4.6+
> Signed-off-by: Matt Fleming <matt@...eblueprint.co.uk>
>
> I made a request in the bugzilla for the reporter to
> give a bootlog with efi=debug which I'm still waiting on.
>
> Any ideas?
>
> Thanks,
> Laura

dmesg with efi=debug from the reporter is attached

View attachment "dmesg20161019.txt" of type "text/plain" (84164 bytes)