On Thu, 5 Apr 2018 17:07:21 +0200 Viktor Mihajlovski <mihaj...@linux.vnet.ibm.com> wrote:
> 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(-) > This looks reasonable enough to queue for 2.12 (with a bios rebuild), especially as I also plan to queue the cpu_synchronize_state() patch. Just waiting for a R-b on the bios part.
