From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:46259)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <kraxel@redhat.com>) id 1ZhvW7-0000jt-Kh
	for qemu-devel@nongnu.org; Fri, 02 Oct 2015 04:16:36 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <kraxel@redhat.com>) id 1ZhvW3-0000HZ-HD
	for qemu-devel@nongnu.org; Fri, 02 Oct 2015 04:16:35 -0400
Received: from mx1.redhat.com ([209.132.183.28]:48830)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <kraxel@redhat.com>) id 1ZhvW3-0000HV-C6
	for qemu-devel@nongnu.org; Fri, 02 Oct 2015 04:16:31 -0400
Message-ID: <1443773786.14636.12.camel@redhat.com>
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Fri, 02 Oct 2015 10:16:26 +0200
In-Reply-To: <20151001160242.GA7766@morn.lan>
References: <1443701677-13629-1-git-send-email-markmb@redhat.com>
	<1443701819-13855-1-git-send-email-markmb@redhat.com>
	<1443701819-13855-7-git-send-email-markmb@redhat.com>
	<560D5057.6010308@redhat.com> <20151001160242.GA7766@morn.lan>
Content-Type: text/plain; charset="UTF-8"
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] [PATCH v4 6/7] Make the kernel image in the fw_cfg
 DMA interface bootable
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Kevin O'Connor <kevin@koconnor.net>
Cc: Drew <drjones@redhat.com>, Stefan Hajnoczi <stefanha@gmail.com>, "Gabriel L. Somlo" <somlo@cmu.edu>, qemu-devel@nongnu.org, Marc =?ISO-8859-1?Q?Mar=ED?= <markmb@redhat.com>, Laszlo Ersek <lersek@redhat.com>

  Hi,

> That's fine with me.  Marc - I think qemu_vmlinux_setup() in SeaBIOS
> with the following would work:
> 
> void qemu_vmlinux_setup(void)
> {
>     u32 kernel_size;
>     qemu_cfg_read_entry(&kernel_size, QEMU_CFG_KERNEL_SIZE, sizeof(kernel_size));
>     if (kernel_size)
>         boot_add_qemu_vmlinux("QEMU Kernel image", 0);
> }

It isn't that simple.  We also have support for multiboot kernels (using
multiboot.bin option rom).  So when doing this you need to be prepared
to find a multiboot kernel in fw_cfg.

cheers,
  Gerd