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Re: [Qemu-devel] [PATCH 12/13] Add zipl bootloader interpreter

From: Carsten Otte
Subject: Re: [Qemu-devel] [PATCH 12/13] Add zipl bootloader interpreter
Date: Wed, 25 Nov 2009 09:59:12 +0100
User-agent: Mozilla-Thunderbird (X11/20090706)

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.

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