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

[Thomas Huth]

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.

 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(-)

-- 
2.18.1