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Re: [Qemu-devel] [PATCH 1/1] s390: IPL device for s390
From: |
Christian Borntraeger |
Subject: |
Re: [Qemu-devel] [PATCH 1/1] s390: IPL device for s390 |
Date: |
Tue, 08 May 2012 20:54:06 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux i686; rv:11.0) Gecko/20120412 Thunderbird/11.0.1 |
> Well, the only shortcomings I'm aware of of the external IPL are:
>
> * You lose the boot menu. All you get is "entry 0", "entry 1", etc. as the
> description is not part of the boot map
> * You can't choose different entries during runtime. Doing a reboot of a VM
> and selecting a different entry won't work.
>
> The former is pretty annoying if you don't know all of your VMs by heart. The
> latter is an issue when you don't own the qemu process,
> but do own the VM. Think of a hosted environment.
Those are valid points. Regarding the former, I see two things that we might do
here:
1. have the current zipl-"bios" as a fallback if the user does not specify an
s390-ipl device.
That should be pretty easy and might even have the advantage to minimize the
surprise to
existing users of kvm on s390(are there any?). If the user provides an s390-ipl
device
then this is a conscious decision. (I will move the specific virtio-zipl bios
code into
the s390-ipl device nevertheless,see below for rationale)
2. I will check with the zipl maintainer if we could sneak in the necessary
information in
the boot map, the program table or something else (e.g. defining an
component_description,
after component_execute). It just have to be compatible with the layout that
the firmware
loader expects. Not sure yet, if this will work out
I definitely want to concentrate all booting in this device: kernel,
zipl-virtio, firmware
loader and everything else, because on system_reset we have to reset the cpus
and set
the PSW accordingly. As a device we are being called during reset at the right
time.
Does that make sense? If yes I will try to refresh that patch as outlined above
Christian
- [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, 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,
Christian Borntraeger <=
- 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