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

From: Alexander Graf
Subject: Re: [Qemu-devel] [PATCH 12/13] Add zipl bootloader interpreter
Date: Tue, 24 Nov 2009 19:56:10 +0100

On 24.11.2009, at 19:53, Anthony Liguori wrote:

> Alexander Graf wrote:
>> The default bootloader on S390 is zipl. Because we don't emulate normal S390
>> hardware we need to write our own parser for the bootloader configuration,
>> so we can boot off real hard disks.
>> This patch adds a pretty simple implementation of such an interpreter. It 
>> only
>> supports 512 bytes sector sizes, always boots the default entry and doesn't
>> work with reboots yet. But it's better than nothing.
> This is a bit unfortunate.  Wouldn't it be better to write a custom version 
> of zipl that ran in the guest?

Yeah, I've been struggling quite a bit with this myself. Writing a custom 
version that runs in the guest means we have to create

1) extboot
2) input backdoor

Or implement virtio in that custom version. That sounds like a pretty huge 

So I decided to go for the easy way for now and hopefully migrate to an 
in-guest version later.


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