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

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

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.

Hi Thomas, One area that could possibly be cleaned up further are places 
where net devices are treated as corner cases due to the separate 
bootloader. Off the top of my head I know in pc-bios main.c, the 
is_dev_possibly_bootable() function rejects net devices for this reason. 
I'm not sure if that is the only place though. Otherwise it looks good 
to me. I can work on a v2 of the boot order support that assumes the 
network bootloader is integrated. Regards, Jared Rossi

>
> 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
>