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Re: [Qemu-devel] [PATCH 1/1] s390: IPL device for s390
From: |
Alexander Graf |
Subject: |
Re: [Qemu-devel] [PATCH 1/1] s390: IPL device for s390 |
Date: |
Tue, 8 May 2012 14:40:16 +0200 |
On 08.05.2012, at 14:32, Christian Borntraeger wrote:
> On 04/05/12 20:12, Alexander Graf wrote:
>>
>> On 04.05.2012, at 16:02, Christian Borntraeger wrote:
>>
>>> On 04/05/12 16:00, Christian Borntraeger wrote:
>>>>>> An IPL (booting) on s390 of SCSI disks is done by a firmware component.
>>>>>> Lets implement this scheme as an qemu device that also allows to
>>>>>> configure the IPL like the HMC. We have a parameter iplid that
>>>>>> refers to a disk device and a load parm that specifies the entry
>>>>>> on the disk to be ipled. We also provide a default device
>>>>>> if no -device s390-ipl statement is given.
>>>>>
>>>>> Any reason we can't do this in guest firmware code?
>>>>
>>>> Conceptually guest firmware does not exist in the guest address space
>>>> on s390. It is separate in a storage area called HSA.
>>>> (you could say the existing hardware is semi-hosted, you cant buy it bare
>>>> metal.
>>>> Doing the boot code in guest address space will fail if the guest firmware
>>>> address collides with the addresses specified by a bootmap.
>>>
>>> Or in other words, this code is closer to the real s390 boxes.
>>
>> Yeah, I see the point. I'd really like to get Anthony's comments on this one
>> first though.
>
> Right.
>
> Anthony, this is the prototype of the IPL device that we have talked about
> some weeks
> ago. Is an external device to do the IPL process for s390 still ok with you?
Even with an external IPL, we should still be able to detect that a guest
provides its own virtio-zipl code that contains a boot menu and execute that
instead of directly booting into the first entry, right?
Alex
- [Qemu-devel] [PATCH 0/1] RFC: ipl device for s390, Christian Borntraeger, 2012/05/04
- [Qemu-devel] [PATCH 1/1] s390: IPL device for s390, Christian Borntraeger, 2012/05/04
- Re: [Qemu-devel] [PATCH 1/1] s390: IPL device for s390, Alexander Graf, 2012/05/04
- Re: [Qemu-devel] [PATCH 1/1] s390: IPL device for s390, Christian Borntraeger, 2012/05/04
- Re: [Qemu-devel] [PATCH 1/1] s390: IPL device for s390, Christian Borntraeger, 2012/05/04
- Re: [Qemu-devel] [PATCH 1/1] s390: IPL device for s390, Alexander Graf, 2012/05/04
- Re: [Qemu-devel] [PATCH 1/1] s390: IPL device for s390, Christian Borntraeger, 2012/05/08
- Re: [Qemu-devel] [PATCH 1/1] s390: IPL device for s390,
Alexander Graf <=
- Re: [Qemu-devel] [PATCH 1/1] s390: IPL device for s390, Christian Borntraeger, 2012/05/08
- Re: [Qemu-devel] [PATCH 1/1] s390: IPL device for s390, Alexander Graf, 2012/05/08
- Re: [Qemu-devel] [PATCH 1/1] s390: IPL device for s390, Christian Borntraeger, 2012/05/08
- Re: [Qemu-devel] [PATCH 1/1] s390: IPL device for s390, Alexander Graf, 2012/05/08
- Re: [Qemu-devel] [PATCH 1/1] s390: IPL device for s390, Anthony Liguori, 2012/05/08