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

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Message-ID: <20200411085001.GA28742@localhost.localdomain>
Date:   Sat, 11 Apr 2020 10:50:01 +0200
From:   Thomas Meyer <thomas@...3r.de>
To:     Arvind Sankar <nivedita@...m.mit.edu>
Cc:     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 10:38:21AM -0400, Arvind Sankar wrote:
> 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.

okay, ping me if I should test something on real hardware.

> 
> Thanks.