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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1235277

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1235277

Title:
  armhf: virtio_mmio support

Status in “linux” package in Ubuntu:
  In Progress
Status in “linux” source package in Saucy:
  In Progress

Bug description:
  SRU Justification:

  Impact: qemu 1.6 adds support for virtio memory mapped devices (like
  net and block) on arm. While S will probably ship with qemu 1.5, we
  know it'll be provided in a ppa and we want to take advantage of the
  speedup offered by virtio, so

  1)  turn on virtio_mmio on armhf (generic and generic-lpae)
  2) uniform VIRTIO* support among all the different archs, making it a compiled-in options like on i386 and amd64

  Fix: apply the attached config patch and recompile a kernel with it

  Testcase: try booting a qemu kvm using a kernel without this patch:

  sudo qemu-system-arm -machine vexpress-a15 -cpu cortex-a15 -enable-kvm
  -m 512M -kernel /boot/vmlinuz-`uname -r` -append "console=ttyAMA0
  earlyprintk=serial root=/dev/mmcblk0 ro rootfstype=ext4" -serial stdio
  -dtb /lib/firmware/`uname -r`/device-tree/vexpress-v2p-ca15-tc1.dtb
  -initrd /boot/initrd.img-`uname -r` -drive if=sd,cache=writeback,file
  =saucy-server-cloudimg-armhf.img -net nic -net
  user,hostfwd=tcp::2223-:22 -display none

  and then try to boot another instance using a kernel with the config
  patch applied:

  sudo qemu-system-arm -machine vexpress-a15 -cpu cortex-a15 -enable-kvm
  -m 512M -kernel /boot/vmlinuz-`uname -r` -append "console=ttyAMA0
  earlyprintk=serial root=/dev/vda ro rootfstype=ext4" -serial stdio
  -dtb /lib/firmware/`uname -r`/device-tree/vexpress-v2p-ca15-tc1.dtb
  -initrd /boot/initrd.img-`uname -r` -drive
  if=none,cache=writeback,file=saucy-server-cloudimg-armhf.img,id=foo
  -device virtio-blk-device,drive=foo -display none -netdev tap,id=tap0
  -device virtio-net-device,netdev=tap0

  the difference is noticeable to the naked eye.

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