Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
MIME-Version: 1.0
References: <20200109150218.16544-1-nivedita@alum.mit.edu> <20200405154245.11972-1-me@prok.pw>
 <20200405231845.GA3095309@rani.riverdale.lan>
In-Reply-To: <20200405231845.GA3095309@rani.riverdale.lan>
From:   Ard Biesheuvel <ardb@kernel.org>
Date:   Mon, 6 Apr 2020 10:44:25 +0200
Message-ID: <CAMj1kXHWhPmnaCS74n=1MYLfnsKqf+UAfmaLGQYx9jH3YsXvfg@mail.gmail.com>
Subject: Re: [PATCH 1/2] x86/boot/compressed/64: Remove .bss/.pgtable from bzImage
To:     Arvind Sankar <nivedita@alum.mit.edu>
Cc:     Sergey Shatunov <me@prok.pw>, 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>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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.