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Date: Wed, 25 Nov 2009 09:59:12 +0100
From: Carsten Otte <carsteno@de.ibm.com>
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Subject: Re: [Qemu-devel] [PATCH 12/13] Add zipl bootloader interpreter
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To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Carsten Otte <cotte@de.ibm.com>, Alexander Graf <agraf@suse.de>, Aurelien Jarno <aurelien@aurel32.net>, qemu-devel@nongnu.org

Anthony Liguori wrote:
> This is a bit unfortunate.  Wouldn't it be better to write a custom 
> version of zipl that ran in the guest?
> 
> This is like implementing grub in qemu (or pygrub in Xen).  The level of 
> security exposure this introduces is really scary.
Oh that's really the wrong way to see it. We don't have bios, and 
therefore we need _some_ functionality to start up initial code on the 
disk. The interface that Alex is implementing is also used by the real 
hardware to load from disk in case a scsi/fcp volume is used, and it is 
part of the published machine architecture. That's very unlike grub.