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Re: [PATCH for-5.2 0/6] Continue booting in case the first device is not

From: Janosch Frank
Subject: Re: [PATCH for-5.2 0/6] Continue booting in case the first device is not bootable
Date: Tue, 4 Aug 2020 16:49:43 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0

On 7/28/20 8:37 PM, Thomas Huth wrote:
> If the user did not specify a "bootindex" property, the s390-ccw bios
> tries to find a bootable device on its own. Unfortunately, it alwasy
> stops at the very first device that it can find, no matter whether it's
> bootable or not. That causes some weird behavior, for example while
>  qemu-system-s390x -hda bootable.qcow2
> boots perfectly fine, the bios refuses to work if you just specify
> a virtio-scsi controller in front of it:
>  qemu-system-s390x -device virtio-scsi -hda bootable.qcow2
> Since this is quite uncomfortable and confusing for the users, and
> all major firmwares on other architectures correctly boot in such
> cases, too, let's also try to teach the s390-ccw bios how to boot
> in such cases.
> For this, we have to get rid of the various panic()s and IPL_assert()
> statements at the "low-level" function and let the main code handle
> the decision instead whether a boot from a device should fail or not,
> so that the main code can continue searching in case it wants to.

Are you planning to add a/re-use an existing test for this?
The PXE test already helped me quite a lot to find my mistakes for the
bios cleanup series.

>  Thomas
> Thomas Huth (6):
>   pc-bios/s390-ccw/Makefile: Compile with -std=gnu99, -fwrapv and
>     -fno-common
>   pc-bios/s390-ccw: Move ipl-related code from main() into a separate
>     function
>   pc-bios/s390-ccw: Move the inner logic of find_subch() to a separate
>     function
>   pc-bios/s390-ccw: Do not bail out early if not finding a SCSI disk
>   pc-bios/s390-ccw: Scan through all boot devices if none has been
>     specified
>   pc-bios/s390-ccw: Allow booting in case the first virtio-blk disk is
>     bad
>  pc-bios/s390-ccw/Makefile        |   7 +-
>  pc-bios/s390-ccw/bootmap.c       |  34 ++++--
>  pc-bios/s390-ccw/main.c          | 172 +++++++++++++++++++------------
>  pc-bios/s390-ccw/s390-ccw.h      |   2 +-
>  pc-bios/s390-ccw/virtio-blkdev.c |   7 +-
>  pc-bios/s390-ccw/virtio-scsi.c   |  25 +++--
>  pc-bios/s390-ccw/virtio-scsi.h   |   2 +-
>  7 files changed, 157 insertions(+), 92 deletions(-)

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