[Bug 1865626] [NEW] qemu hang when ipl boot from a mdev dasd

[liang yan]

Public bug reported:

qemu latest
kernel 5.3.18

I am using a passthrough dasd as boot device, the installment looks fine
and gets into reboot process. However VM could not boot and just hang as
below after that. I have been checking on "s390: vfio-ccw dasd ipl
support" series right now but no clue yet. Could anyone take a look for
it? Thanks.


s390vsw188:~ # bash test.sh
LOADPARM=[        ]
executing ccw chain at : 0x0000000000000018
executing ccw chain at : 0x000000000000e000

2020-03-01T06:24:56.879314Z qemu-system-s390x: warning: vfio-ccw (devno
fe.0.0000): PFCH flag forced


s390zp12:~ # cat test.sh
/root/qemu/s390x-softmmu/qemu-system-s390x \
-machine s390-ccw-virtio,accel=kvm \
-nographic \
-bios /root/qemu/pc-bios/s390-ccw/s390-ccw.img \
-device 
vfio-ccw,id=hostdev0,sysfsdev=/sys/bus/mdev/devices/08e8c006-146d-48d3-b21a-c005f9d3a04b,,devno=fe.0.0000,bootindex=1
 \
-global vfio-ccw.force-orb-pfch=yes \

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1865626

Title:
  qemu hang when ipl boot from a mdev dasd

Status in QEMU:
  New

Bug description:
  qemu latest
  kernel 5.3.18

  I am using a passthrough dasd as boot device, the installment looks
  fine and gets into reboot process. However VM could not boot and just
  hang as below after that. I have been checking on "s390: vfio-ccw dasd
  ipl support" series right now but no clue yet. Could anyone take a
  look for it? Thanks.


  s390vsw188:~ # bash test.sh
  LOADPARM=[        ]
  executing ccw chain at : 0x0000000000000018
  executing ccw chain at : 0x000000000000e000

  2020-03-01T06:24:56.879314Z qemu-system-s390x: warning: vfio-ccw
  (devno fe.0.0000): PFCH flag forced


  s390zp12:~ # cat test.sh
  /root/qemu/s390x-softmmu/qemu-system-s390x \
  -machine s390-ccw-virtio,accel=kvm \
  -nographic \
  -bios /root/qemu/pc-bios/s390-ccw/s390-ccw.img \
  -device 
vfio-ccw,id=hostdev0,sysfsdev=/sys/bus/mdev/devices/08e8c006-146d-48d3-b21a-c005f9d3a04b,,devno=fe.0.0000,bootindex=1
 \
  -global vfio-ccw.force-orb-pfch=yes \

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