IPL from virtio-scsi currently uses a non-standard parameter type definition to pass boot parameters from QEMU to the BIOS.
There are two potential issues with this approach: o If the guest operating systems requests a re-ipl of type CCW where the boot device is a virtio-scsi HBA, this goes unnoticed by QEMU. The BIOS will detect that it's IPLing from a SCSI device, but it will boot the first LUN found, which might not be the one used for the initial boot. o The guest operating system can be confused by an unknown IPL parameter block type. If the OS hasn't previously used diag308 to store the IPL info but is changed to do so, a user-observable change in behavior will happen. The following patches address the issues above. Viktor Mihajlovski (3): s390: Refactor IPL parameter block generation s390: Ensure IPL from SCSI works as expected s390: Do not pass inofficial IPL type to the guest hw/s390x/ipl.c | 112 ++++++++++++++++++++++++++++++++------------- pc-bios/s390-ccw/bootmap.c | 7 +++ pc-bios/s390-ccw/iplb.h | 15 +++++- 3 files changed, 100 insertions(+), 34 deletions(-) -- 1.9.1
