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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 20:29:38 +0100 |
On 24.11.2009, at 20:26, Anthony Liguori wrote:
> Alexander Graf wrote:
>> 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
>> project.
>>
>> So I decided to go for the easy way for now and hopefully migrate to an
>> in-guest version later.
>>
>
> Can't you just use kboot?
>
> Use a kernel loader to load the kboot module/initrd, include kboot as our
> firmware, then let kboot do the magic to launch the real linux kernel from
> disk.
Hm, so we'd have to rely on kexec working properly? I've seen how badly that
turned out on the PS3. I guess I'd rather write a virtio implementation :-).
Alex
- [Qemu-devel] [PATCH 11/13] Set default console to virtio on S390x, (continued)
- [Qemu-devel] [PATCH 11/13] Set default console to virtio on S390x, Alexander Graf, 2009/11/24
- [Qemu-devel] [PATCH 04/13] Add KVM support for S390x, Alexander Graf, 2009/11/24
- [Qemu-devel] [PATCH 02/13] S/390 host/target build system support, Alexander Graf, 2009/11/24
- [Qemu-devel] [PATCH 06/13] Add support for S390x system emulation, Alexander Graf, 2009/11/24
- [Qemu-devel] [PATCH 12/13] Add zipl bootloader interpreter, Alexander Graf, 2009/11/24
- Re: [Qemu-devel] [PATCH 12/13] Add zipl bootloader interpreter, Anthony Liguori, 2009/11/24
- Re: [Qemu-devel] [PATCH 12/13] Add zipl bootloader interpreter, Alexander Graf, 2009/11/24
- Re: [Qemu-devel] [PATCH 12/13] Add zipl bootloader interpreter, Anthony Liguori, 2009/11/24
- Re: [Qemu-devel] [PATCH 12/13] Add zipl bootloader interpreter,
Alexander Graf <=
- Re: [Qemu-devel] [PATCH 12/13] Add zipl bootloader interpreter, Mark Williamson, 2009/11/24
- Re: [Qemu-devel] [PATCH 12/13] Add zipl bootloader interpreter, Anthony Liguori, 2009/11/24
- Re: [Qemu-devel] [PATCH 12/13] Add zipl bootloader interpreter, Hannes Reinecke, 2009/11/25
- Re: [Qemu-devel] [PATCH 12/13] Add zipl bootloader interpreter, Alexander Graf, 2009/11/25
- Re: [Qemu-devel] [PATCH 12/13] Add zipl bootloader interpreter, Carsten Otte, 2009/11/25
- Re: [Qemu-devel] [PATCH 12/13] Add zipl bootloader interpreter, Carsten Otte, 2009/11/25
- Re: [Qemu-devel] [PATCH 12/13] Add zipl bootloader interpreter, Carsten Otte, 2009/11/25
- Re: [Qemu-devel] [PATCH 12/13] Add zipl bootloader interpreter, Carsten Otte, 2009/11/25
[Qemu-devel] [PATCH 03/13] S/390 fake TCG implementation, Alexander Graf, 2009/11/24