Re: [PATCH 0/7] pc-bios/s390-ccw: Merge the netboot loader into s390-ccw.img

[Jared Rossi <jrossi@linux.ibm.com>]

Hi Thomas,

I just wanted to get your thoughts on the status of the netboot loader merge.
I see that the first patch from this series was merged, but not the others. Is
there any issue with the rest of the changes?

I would like to put together a comprehensive rework for all device types that
replaces the IPL panics with returns, but as we discussed this is best applied
after the netboot loader has been unified with the main s390-ccw.img file.

I can base my patches on either current master (with a special case for netboot)
or the combined bootloader, depending on how you would like to proceed. Let me
know if there is anything I can do to help with test/review of the changes from
your side.

Thanks,
Jared Rossi

On 6/21/24 4:24 AM, Thomas Huth wrote:

> We originally built a separate binary for the netboot code since it
> was considered as experimental and we could not be sure that the
> necessary SLOF module had been checked out. Time passed, the netboot
> code proved its usefulness, and the build system nowadays makes sure
> that the SLOF module is checked out if you have a s390x compiler available
> for building the s390-ccw bios. In fact, the possibility to build the
> s390-ccw.img without s390-netboot.img has been removed in commit
> bf6903f6944f ("pc-bios/s390-ccw: always build network bootloader")
> already.
>
> So it does not make too much sense anymore to keep the netboot code
> in a separate binary. To make it easier to support a more flexible
> boot process soon that supports more than one boot device via the
> bootindex properties, let's finally merge the netboot code into the
> main s390-ccw.img binary now.
>
> Thomas Huth (7):
>    pc-bios/s390-ccw: Remove duplicated LDFLAGS
>    hw/s390x/ipl: Provide more memory to the s390-ccw.img firmware
>    pc-bios/s390-ccw: Use the libc from SLOF for the main s390-ccw.img
>      binary, too
>    pc-bios/s390-ccw: Link the netboot code into the main s390-ccw.img
>      binary
>    hw/s390x: Remove the possibility to load the s390-netboot.img binary
>    pc-bios/s390-ccw: Merge netboot.mak into the main Makefile
>    docs/system/s390x/bootdevices: Update the documentation about network
>      booting
>
>   docs/system/s390x/bootdevices.rst |  20 +++----
>   pc-bios/s390-ccw/netboot.mak      |  62 ---------------------
>   hw/s390x/ipl.h                    |  12 ++--
>   pc-bios/s390-ccw/cio.h            |   2 +
>   pc-bios/s390-ccw/iplb.h           |   4 +-
>   pc-bios/s390-ccw/libc.h           |  89 ------------------------------
>   pc-bios/s390-ccw/s390-ccw.h       |  10 +++-
>   pc-bios/s390-ccw/virtio.h         |   1 -
>   hw/s390x/ipl.c                    |  65 +++-------------------
>   hw/s390x/s390-virtio-ccw.c        |  10 +---
>   pc-bios/s390-ccw/bootmap.c        |   4 +-
>   pc-bios/s390-ccw/cio.c            |   2 +-
>   pc-bios/s390-ccw/dasd-ipl.c       |   2 +-
>   pc-bios/s390-ccw/jump2ipl.c       |   2 +-
>   pc-bios/s390-ccw/libc.c           |  88 -----------------------------
>   pc-bios/s390-ccw/main.c           |  15 +++--
>   pc-bios/s390-ccw/menu.c           |  25 ++++-----
>   pc-bios/s390-ccw/netmain.c        |  15 +----
>   pc-bios/s390-ccw/sclp.c           |   2 +-
>   pc-bios/s390-ccw/virtio-blkdev.c  |   1 -
>   pc-bios/s390-ccw/virtio-scsi.c    |   2 +-
>   pc-bios/s390-ccw/virtio.c         |   2 +-
>   pc-bios/meson.build               |   1 -
>   pc-bios/s390-ccw/Makefile         |  69 +++++++++++++++++++----
>   pc-bios/s390-netboot.img          | Bin 67232 -> 0 bytes
>   25 files changed, 122 insertions(+), 383 deletions(-)
>   delete mode 100644 pc-bios/s390-ccw/netboot.mak
>   delete mode 100644 pc-bios/s390-ccw/libc.h
>   delete mode 100644 pc-bios/s390-ccw/libc.c
>   delete mode 100644 pc-bios/s390-netboot.img
>