[Bug 1396470] Re: please enable CONFIG_VIRTIO_MMIO on armmp

Ubuntu 14.10 (Utopic Unicorn) with kernel 3.16 has reached end of life
and this bug will not be fixed for that specific release. Please file a
new bug if this issue still exists in a supported release.

** Changed in: linux (Ubuntu Utopic)
Status: Fix Committed => Won't Fix

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https://bugs.launchpad.net/bugs/1396470

Title:
please enable CONFIG_VIRTIO_MMIO on armmp

Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Lucid:
Invalid
Status in linux source package in Utopic:
Won't Fix
Status in linux source package in Vivid:
Fix Released

Bug description:
[Impact]
Degraded performance during network and disk activity in a kvm guest.

[Test case]
Try booting a vm and do some disk/net activity with and without this driver.

[Regression potential]
In case of regressions, it will just hit people using kvm on 32bit armhf hardware (the lpae variant in particular): we already had this driver on in the past, it's on by default on every arch, it's widely used and upstream is very active - i say it's a low potential regression.

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Hi,

The current armmp (linux-
image-3.16.0-26-generic_3.16.0-26.34_armhf.deb) could have virtio-mmio
enabled for faster vm guests. Currenlty it seems to have:

CONFIG_NET_9P_VIRTIO=m
CONFIG_VIRTIO_BLK=y
CONFIG_SCSI_VIRTIO=m
CONFIG_VIRTIO_NET=y
CONFIG_CAIF_VIRTIO=m
CONFIG_VIRTIO_CONSOLE=y
CONFIG_HW_RANDOM_VIRTIO=m
CONFIG_VIRTIO=y
CONFIG_VIRTIO_PCI=y
# CONFIG_VIRTIO_BALLOON is not set
# CONFIG_VIRTIO_MMIO is not set

Now using virtio net and block is not possible, and you have to revert
to emulated devices.

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