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[Bug 1563887] Re: qemu-system-ppc64 freezes on starting image on ppc64le

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ok. so after playing some, this all comes down to needing 'usb=off' on
the qemu command line.

works:
qemu-system-ppc64 -enable-kvm -machine usb=off -device virtio-net-pci,netdev=net00 -netdev type=user,id=net00 -drive if=virtio,file=xenial-server-cloudimg-ppc64el-disk1.img,format=qcow2 -drive if=virtio,file=my-seed.img,format=raw -snapshot -m 256 -nographic


doesnt work:
qemu-system-ppc64 -enable-kvm  virtio-net-pci,netdev=net00 -netdev type=user,id=net00 -drive if=virtio,file=xenial-server-cloudimg-ppc64el-disk1.img,format=qcow2 -drive if=virtio,file=my-seed.img,format=raw -snapshot -m 256 -nographic


the interesting bit of 'doesnt work' is that it *does* work, the user just thinks it doesnt because output is eaten up and doesnt go to console, but it *does* work fine.
http://paste.ubuntu.com/15660816/

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https://bugs.launchpad.net/bugs/1563887

Title:
  qemu-system-ppc64 freezes on starting image on ppc64le

Status in QEMU:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed
Status in livecd-rootfs package in Ubuntu:
  New
Status in qemu package in Ubuntu:
  Confirmed

Bug description:
  qemu-system-ppc64 running on Ubuntu 16.04 beta-2 fails to start an
  image as part of the certification process. This on an IBM ppc64le in
  PowerVM mode running Ubuntu 16.04 beta-2 deployed by MAAS 1.9.1. There
  is no error output.

  ubuntu@alpine01:~/kvm$ qemu-system-ppc64 -m 256 -display none -nographic -net nic -net user,net=10.0.0.0/8,host=10.0.0.1,hostfwd=tcp::2222-:22 -machine pseries -drive file=xenial-server-cloudimg-ppc64el-disk1.img,if=virtio -drive file=seed.iso,if=virtio
  WARNING: Image format was not specified for 'seed.iso' and probing guessed raw.
           Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted.
           Specify the 'raw' format explicitly to remove the restrictions.

  SLOF **********************************************************************
  QEMU Starting
   Build Date = Jan 29 2016 18:58:37
   FW Version = buildd@ release 20151103
   Press "s" to enter Open Firmware.

  Populating /vdevice methods
  Populating /vdevice/vty@71000000
  Populating /vdevice/nvram@71000001
  Populating /vdevice/l-lan@71000002
  Populating /vdevice/v-scsi@71000003
         SCSI: Looking for devices
            8200000000000000 CD-ROM   : "QEMU     QEMU CD-ROM      2.5+"
  Populating /pci@800000020000000
                       00 1800 (D) : 1af4 1001    virtio [ block ]
                       00 1000 (D) : 1af4 1001    virtio [ block ]
                       00 0800 (D) : 106b 003f    serial bus [ usb-ohci ]
                       00 0000 (D) : 1234 1111    qemu vga
  No NVRAM common partition, re-initializing...
  Installing QEMU fb

  Scanning USB
    OHCI: initializing
      USB Keyboard
      USB mouse
  No console specified using screen & keyboard

    Welcome to Open Firmware

    Copyright (c) 2004, 2011 IBM Corporation All rights reserved.
    This program and the accompanying materials are made available
    under the terms of the BSD License available at
    http://www.opensource.org/licenses/bsd-license.php

  Trying to load:  from: /pci@800000020000000/scsi@3 ...
  E3404: Not a bootable device!
  Trying to load:  from: /pci@800000020000000/scsi@2 ...   Successfully loaded
  Linux ppc64le
  #31-Ubuntu SMP F

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: qemu-system-ppc 1:2.5+dfsg-5ubuntu6
  ProcVersionSignature: Ubuntu 4.4.0-16.32-generic 4.4.6
  Uname: Linux 4.4.0-16-generic ppc64le
  ApportVersion: 2.20-0ubuntu3
  Architecture: ppc64el
  Date: Wed Mar 30 14:10:01 2016
  KvmCmdLine:
   COMMAND         STAT  EUID  RUID   PID  PPID %CPU COMMAND
   kvm-irqfd-clean S<       0     0  1172     2  0.0 [kvm-irqfd-clean]
   qemu-nbd        Ssl      0     0 13467     1  0.0 qemu-nbd -c /dev/nbd0 xenial-server-cloudimg-ppc64el-disk1.img
   qemu-system-ppc Sl+   1000  1000 18973 18896  101 qemu-system-ppc64 -m 256 -display none -nographic -net nic -net user,net=10.0.0.0/8,host=10.0.0.1,hostfwd=tcp::2222-:22 -machine pseries -drive file=xenial-server-cloudimg-ppc64el-disk1.img,if=virtio -drive file=seed.iso,if=virtio
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinux-4.4.0-16-generic root=UUID=92d820c8-ab25-497b-9b1e-f1435992bbf3 ro
  ProcLoadAvg: 1.08 0.94 0.58 2/616 19571
  ProcLocks:
   1: POSIX  ADVISORY  WRITE 886 00:13:381 0 EOF
   2: POSIX  ADVISORY  WRITE 1339 00:13:528 0 EOF
   3: FLOCK  ADVISORY  WRITE 1284 00:13:522 0 EOF
   4: POSIX  ADVISORY  WRITE 2281 00:13:563 0 EOF
   5: POSIX  ADVISORY  WRITE 1331 00:13:536 0 EOF
  ProcSwaps:
   Filename				Type		Size	Used	Priority
   /swap.img                               file		8388544	0	-1
  ProcVersion: Linux version 4.4.0-16-generic (buildd@bos01-ppc64el-001) (gcc version 5.3.1 20160320 (Ubuntu/Linaro/IBM 5.3.1-12ubuntu4) ) #32-Ubuntu SMP Thu Mar 24 22:31:14 UTC 2016
  SourcePackage: qemu
  UpgradeStatus: No upgrade log present (probably fresh install)
  bootlist:
   /pci@800000020000011/pci1014,034A@0/sas/disk@4068402c40
   /pci@800000020000018/ethernet@0:speed=auto,duplex=auto,csarch,000.000.000.000,,000.000.000.000,000.000.000.000,5,5,000.000.000.000,512
   /pci@800000020000018/ethernet@0,1:speed=auto,duplex=auto,csarch,000.000.000.000,,000.000.000.000,000.000.000.000,5,5,000.000.000.000,512
   /pci@800000020000018/ethernet@0,2:speed=auto,duplex=auto,csarch,000.000.000.000,,000.000.000.000,000.000.000.000,5,5,000.000.000.000,512
   /pci@800000020000018/ethernet@0,3:speed=auto,duplex=auto,csarch,000.000.000.000,,000.000.000.000,000.000.000.000,5,5,000.000.000.000,512
  cpu_cores: Number of cores present = 8
  cpu_coreson: Number of cores online = 8
  cpu_smt: SMT=8
  lscfg_vp: Error: [Errno 2] No such file or directory: 'lscfg'
  lsmcode: Error: [Errno 2] No such file or directory: 'lsmcode'

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