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Re: [Qemu-devel] [RFC PATCH 00/14] Implement network booting directly in
From: |
David Hildenbrand |
Subject: |
Re: [Qemu-devel] [RFC PATCH 00/14] Implement network booting directly into the s390-ccw BIOS |
Date: |
Tue, 27 Jun 2017 17:41:31 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.0 |
On 27.06.2017 13:48, Thomas Huth wrote:
> It's already possible to do a network boot of an s390x guest with an
> external netboot image (based on a Linux installation), but it would
> be much more convenient if the s390-ccw firmware supported network
> booting right out of the box, without the need to assemble such an
> external image first.
>
> This patch series now introduces network booting via DHCP and TFTP
> directly into the s390-ccw firmware by re-using the networking stack
> from the SLOF firmware (see https://github.com/aik/SLOF/ for details),
> and adds a driver for virtio-net-ccw devices.
>
> Once the patches have been applied, you can download an .INS file
> via TFTP which contains the information about the further files
> that have to be loaded - kernel, initrd, etc. For example, you can
> use the built-in TFTP and DHCP server of QEMU for this by starting
> QEMU with:
Pretty cool stuff!
>
> qemu-system-s390x ... -device virtio-net,netdev=n1,bootindex=1 \
> -netdev user,id=n1,tftp=/path/to/tftp,bootfile=generic.ins
>
> The .INS file has to use the same syntax as the .INS files that can
> already be found on s390x Linux distribution installation CD-ROMs.
>
> The patches are still in a rough shape, but before I continue here,
> I though I'd get some feedback first. Specifically:
>
> - This adds a lot of additional code to the s390-ccw firmware (and
> the binary is afterwards three times as big as before, 75k instead
> of 25k) ... is that still acceptable?
As mentioned in patch #1, would it somehow be able to include code
rather than copying it and maintaining it separately?
>
> - Is it OK to require loading an .INS file first? Or does anybody
> have a better idea how to load multiple files (kernel, initrd,
> etc. ...)?
Guess this is the way to go for now.
>
> - The code from SLOF uses a different coding style (TABs instead
> of space) ... is it OK to keep that coding style here so we
> can share patches between SLOF and s390-ccw more easily?
>
> - The code only supports TFTP (via UDP) ... I think that is OK for
> most use-cases, but if we ever want to support network booting
> via HTTP or something else that is based on TCP, we would need to
> use something else instead... Should we maybe rather head towards
> grub2, petitboot or something different instead?
Good question, I think all these solutions will require way more effort.
>
> Thomas
--
Thanks,
David
- Re: [Qemu-devel] [RFC PATCH 00/14] Implement network booting directly into the s390-ccw BIOS, (continued)
- Re: [Qemu-devel] [RFC PATCH 00/14] Implement network booting directly into the s390-ccw BIOS, Farhan Ali, 2017/06/27
- Re: [Qemu-devel] [RFC PATCH 00/14] Implement network booting directly into the s390-ccw BIOS, Viktor Mihajlovski, 2017/06/27
- Re: [Qemu-devel] [RFC PATCH 00/14] Implement network booting directly into the s390-ccw BIOS, Thomas Huth, 2017/06/27
- Re: [Qemu-devel] [RFC PATCH 00/14] Implement network booting directly into the s390-ccw BIOS, Viktor Mihajlovski, 2017/06/28
- Re: [Qemu-devel] [RFC PATCH 00/14] Implement network booting directly into the s390-ccw BIOS, Thomas Huth, 2017/06/28
- Re: [Qemu-devel] [RFC PATCH 00/14] Implement network booting directly into the s390-ccw BIOS, Thomas Huth, 2017/06/28
- Re: [Qemu-devel] [RFC PATCH 00/14] Implement network booting directly into the s390-ccw BIOS, Viktor Mihajlovski, 2017/06/28
- Re: [Qemu-devel] [RFC PATCH 00/14] Implement network booting directly into the s390-ccw BIOS, Thomas Huth, 2017/06/29
- Re: [Qemu-devel] [RFC PATCH 00/14] Implement network booting directly into the s390-ccw BIOS, Viktor Mihajlovski, 2017/06/29
Re: [Qemu-devel] [RFC PATCH 00/14] Implement network booting directly into the s390-ccw BIOS,
David Hildenbrand <=
Re: [Qemu-devel] [RFC PATCH 00/14] Implement network booting directly into the s390-ccw BIOS, Alexander Graf, 2017/06/27
Re: [Qemu-devel] [RFC PATCH 00/14] Implement network booting directly into the s390-ccw BIOS, Christian Borntraeger, 2017/06/28