linux-kernel - Re: [PATCH 1/2] efi/x86: Move efi stub globals from .bss to .data

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Message-ID: <20200410143821.GB936997@rani.riverdale.lan>
Date:   Fri, 10 Apr 2020 10:38:21 -0400
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Thomas Meyer <thomas@...3r.de>
Cc:     Arvind Sankar <nivedita@...m.mit.edu>,
        Ard Biesheuvel <ardb@...nel.org>,
        Borislav Petkov <bp@...en8.de>, Sergey Shatunov <me@...k.pw>,
        hpa@...or.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        mingo@...hat.com, Thomas Gleixner <tglx@...utronix.de>,
        x86@...nel.org, linux-efi <linux-efi@...r.kernel.org>,
        initramfs@...r.kernel.org,
        Donovan Tremura <neurognostic@...tonmail.ch>,
        Harald Hoyer <harald@...er.xyz>
Subject: Re: [PATCH 1/2] efi/x86: Move efi stub globals from .bss to .data

On Fri, Apr 10, 2020 at 01:26:05PM +0200, Thomas Meyer wrote:
> On Mon, Apr 06, 2020 at 02:06:13PM -0400, Arvind Sankar wrote:
> 
> Hi,
> 
> I did write an email to x86@...nel.org, which sadly seems to have no
> mailing list archive, I wonder if my problem has anything to do with the
> patches you are discussing here:
> 
> I found this reply, which contains my original email in my inbox:
> 
> Subject: Kernel v5.5 doesn't boot on my x86 laptop
> 
> Hi,
> 
> I'm using an old MacBookPro1,1 to run Fedora 30 (the last one to support
> x86) and a upstream up-to-date kernel, currently 5.4.16.
> 
> I'm using sd-boot to boot into an EFI-enabled kernel which contains
> an embedded initram cpio image (because loading the image from kernel's
> EFI stub doesn't seem to work for some unknown reason, I tried to debug
> this but my early debugging foo is too weak).
> 
> Kernel 5.4.x works correctly with this setup (but resuming from disk
> seems to have broken in 5.4.x or maybe even earlier - when resuming from
> disk I get all kind of funky OOPSes/errors, but that's another story, hopefully
> 5.5.x was fixed in this regards).
> 
> So I did have a look at the commits under arch/x86/boot and "x86/boot:
> Introduce setup_indirect" (b3c72fc9a78e74161f9d05ef7191706060628f8c) did
> talk about "bump setup_header version in arch/x86/boot/header.S", so I
> did revert above commit and I was finally able to boot into v5.5 kernel!
> 
> So either sd-boot also needs an upgrade or this commit does break
> something.
> Any help is welcome, don't hesitate to get in contact with me if you
> have any questions.
> 
> mfg
> thomas
>  

If it is a problem with 5.5, it would be unrelated to this thread, which
is about problems introduced by patches for the upcoming 5.7.

Thanks.