This bug was nominated against a series that is no longer supported, ie
saucy. The bug task representing the saucy nomination is being closed
as Won't Fix.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu Saucy)
Status: In Progress => Won't Fix
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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:
Won't Fix
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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