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From:   Ard Biesheuvel <ardb@kernel.org>
Date:   Mon, 6 Apr 2020 15:20:30 +0200
Message-ID: <CAMj1kXHTQqYaK=vMs2O1Osy9NMi8dnn8ueBEPod6AaiZvQf0qQ@mail.gmail.com>
Subject: Re: [PATCH 1/2] x86/boot/compressed/64: Remove .bss/.pgtable from bzImage
To:     Sergey Shatunov <me@prok.pw>
Cc:     Arvind Sankar <nivedita@alum.mit.edu>,
        Borislav Petkov <bp@alien8.de>, hpa@zytor.com,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        mingo@redhat.com, Thomas Gleixner <tglx@linutronix.de>,
        x86@kernel.org, linux-efi <linux-efi@vger.kernel.org>
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On Mon, 6 Apr 2020 at 15:14, Sergey Shatunov <me@prok.pw> wrote:
>
> On Mon, 2020-04-06 at 10:44 +0200, Ard Biesheuvel wrote:
> > On Mon, 6 Apr 2020 at 01:18, Arvind Sankar <nivedita@alum.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.
>

Thanks Sergey