linux-kernel - Re: [PATCH 1/2] x86/boot/compressed/64: Remove .bss/.pgtable from bzImage

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Message-ID: <a406bd0ab573e17c1004d3d91948938c209cf94d.camel@prok.pw>
Date:   Mon, 06 Apr 2020 19:36:57 +0700
From:   Sergey Shatunov <me@...k.pw>
To:     Ard Biesheuvel <ardb@...nel.org>,
        Arvind Sankar <nivedita@...m.mit.edu>
Cc:     bp@...en8.de, 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>
Subject: Re: [PATCH 1/2] x86/boot/compressed/64: Remove .bss/.pgtable from
 bzImage

On Mon, 2020-04-06 at 10:44 +0200, Ard Biesheuvel wrote:
> On Mon, 6 Apr 2020 at 01:18, Arvind Sankar <nivedita@...m.mit.edu>
> wrote:
> > On Sun, Apr 05, 2020 at 10:42:46PM +0700, Sergey Shatunov wrote:
> > > This patch causes some strange things happens with my laptop.
> > > 
> > > Cold boot crashed in some early initilization logic with message
> > > 'Failed to execute /esp/.../linux.efi: Buffer Too Small'.
> > > After couple reboots into firmware setup (bios) or hot reboot
> > > from other working kernel (without that commit) helps it to boot.
> > > During bisecting couple times I saw different message:
> > > 'exit_efi() failed; efi_main() failed', but above tricks helps it
> > > too.
> 
> Could you please try adding 'efi=no_disable_early_pci_dma' to the
> kernel command line? The lack of BSS zeroization may result in that
> option to get inadvertently enabled, and it is known to break
> exit_boot() on some systems.

With 'efi=no_disable_early_pci_dma' it works again.