[Bug 1567856] Re: qemu: virtio fails with version 2.5 on ppc64el (slof update needed)

[James Page]

Backporting this package to the UCA Is somewhat tricky as it required a
powerpc architecture builder, which we don't enable for the cloud
archive....

I'll chat with the foundations team and see what we can do.

** Changed in: cloud-archive
   Importance: Undecided => Medium

** Changed in: cloud-archive
       Status: New => Triaged

** Also affects: cloud-archive/mitaka
   Importance: Medium
       Status: Triaged

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Title:
  qemu: virtio fails with version 2.5 on ppc64el (slof update needed)

Status in Ubuntu Cloud Archive:
  Triaged
Status in Ubuntu Cloud Archive mitaka series:
  Triaged

Bug description:
  Virtio interfaces are not detected correctly when booting a cloud
  image with mitaka qemu-2.5 on ppc64el.

  Reproduction
  ============

  First, I installed mitaka's ppc qemu.

  # apt-get install software-properties-common
  # add-apt-repository cloud-archive:mitaka
  # apt-get update
  # apt-get install qemu-system qemu qemu-slof qemu-system-ppc

  I disabled hyperthreading on the ppc64 cores to be able to boot vms
  (as stated here:
  https://wiki.ubuntu.com/ppc64el/CommonQuestions#How_to_use_Ubuntu_as_a_hypervisor.3F)

  # ppc64_cpu --smt=off

  I then tried to boot the ppc64el ubuntu cloud image.

  Qemu tells that "64-bit PCI space not supported yet!". Virtio
  interfaces fail to be detected.

  # /usr/bin/qemu-system-ppc64le -k fr --enable-kvm -m 512 -smp 4 -device virtio-net,mac=de:ad:de:01:02:03,netdev=user.0,addr=03 -netdev user,id=user.0 -hda "./trusty-server-cloudimg-ppc64el-disk1.img" -snapshot -nographic
  SLOF **********************************************************************
  QEMU Starting
  Build Date = Jan 28 2015 21:06:32
  FW Version = buildd@ release 20140630
  Press "s" to enter Open Firmware.

  Populating /vdevice methods
  Populating /vdevice/vty at 71000000
  Populating /vdevice/nvram at 71000001
  Populating /vdevice/v-scsi at 71000002
  SCSI: Looking for devices
  8000000000000000 DISK     : "QEMU     QEMU HARDDISK    2.5+"
  8200000000000000 CD-ROM   : "QEMU     QEMU CD-ROM      2.5+"
  Populating /pci at 800000020000000

  Warning: 64-bit PCI space not supported yet! 100000000 10120000000
  Adapters on 0800000020000000
  00 0000 (D) : 1234 1111    qemu vga
  00 0800 (D) : 106b 003f    serial bus [ usb-ohci ]
  00 1800 (D) : 1af4 1000    virtio [ net ]
  No NVRAM common partition, re-initializing...
  Installing QEMU fb
  (...)
  [    0.294288] virtio-pci: probe of 0000:00:03.0 failed with error -12
  (...)
  Cloud-init v. 0.7.5 running 'init' at Fri, 08 Apr 2016 09:21:00 +0000. Up 132.57 seconds.
  ci-info: +++++++++++++++++++Net device info++++++++++++++++++++
  ci-info: +--------+------+-----------+-----------+------------+
  ci-info: | Device |  Up  |  Address  |    Mask   | Hw-Address |
  ci-info: +--------+------+-----------+-----------+------------+
  ci-info: |   lo   | True | 127.0.0.1 | 255.0.0.0 |     .      |
  ci-info: +--------+------+-----------+-----------+------------+

  Workaround
  ==========

  Installing the qemu-slof version generated for Xenial fixes the
  problem.

  # wget http://launchpadlibrarian.net/235682819/qemu-slof_20151103+dfsg-1ubuntu1_all.deb
  # dpkg -i qemu-slof_20151103+dfsg-1ubuntu1_all.deb
  # /usr/bin/qemu-system-ppc64le -k fr --enable-kvm -m 512 -smp 4 -device virtio-net,mac=de:ad:de:01:02:03,netdev=user.0,addr=03 -netdev user,id=user.0 -hda "./trusty-server-cloudimg-ppc64el-disk1.img" -snapshot -nographic
  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 at 71000000
  Populating /vdevice/nvram at 71000001
  Populating /vdevice/v-scsi at 71000002
  SCSI: Looking for devices
  8000000000000000 DISK     : "QEMU     QEMU HARDDISK    2.5+"
  8200000000000000 CD-ROM   : "QEMU     QEMU CD-ROM      2.5+"
  Populating /pci at 800000020000000
  00 1800 (D) : 1af4 1000    virtio [ net ]
  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
  (...)
  Cloud-init v. 0.7.5 running 'init' at Fri, 08 Apr 2016 09:33:48 +0000. Up 3.35 seconds.
  ci-info: +++++++++++++++++++++++++Net device info+++++++++++++++++++++++++
  ci-info: +--------+------+-----------+---------------+-------------------+
  ci-info: | Device |  Up  |  Address  |      Mask     |     Hw-Address    |
  ci-info: +--------+------+-----------+---------------+-------------------+
  ci-info: |   lo   | True | 127.0.0.1 |   255.0.0.0   |         .         |
  ci-info: |  eth0  | True | 10.0.2.15 | 255.255.255.0 | de:ad:de:01:02:03 |
  ci-info: +--------+------+-----------+---------------+-------------------+

  I think that an update of qemu-slof in the mitaka's cloud-archive is needed, as it was done in Xenial here:
  https://bugs.launchpad.net/ubuntu/+source/slof/+bug/1539646

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