armhf: virtio_mmio support
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
In Progress
|
Undecided
|
Paolo Pisati | ||
Saucy |
Won't Fix
|
Undecided
|
Paolo Pisati |
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-
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-
the difference is noticeable to the naked eye.
Changed in linux (Ubuntu Saucy): | |
assignee: | nobody → Paolo Pisati (p-pisati) |
status: | Incomplete → In Progress |
tags: | added: patch |
This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:
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This change has been made by an automated script, maintained by the Ubuntu Kernel Team.