Public bug reported:
The virtio networking is implemented by the following libvirt XML configuration
snippet:
<interface type='bridge'>
<source bridge='BRIDGEDEV'/>
<mac address='PRIVMACADDR'/>
<model type='virtio'/>
</interface>
The disk attachment is implemented by:
<disk type='block'><driver name='phy'/><source dev='%s'/><target dev='%s'
bus='virtio'/></disk>
When virtio networking is enabled, attaching a virtio disk will render
the networking dysfunctional. Nothing in the kernel log shows anything
useful. The VM's network is simply down. At this point, I have no idea
what happened.
I was doing experiments on Lucid using kernel 2.6.32-11-server. I tried
both 2.6.28-11-generic and 2.6.32-11-generic kernels for the guest VM.
Both have the same issue.
However, I tried the problematic combination: virtio net + virtio disk
attachment (which causes network failure on Lucid) on Karmic. And the
problem is GONE. On Karmic, I'm using kvm version 1:84+dfsg-
0ubuntu16+0.11.0+0ubuntu6.3 and kernel 2.6.31-16-generic for the host,
kernel 2.6.28-11-generic for guest. So it seems like the virtio
functionality is somehow broken in Lucid.
** Affects: eucalyptus (Ubuntu)
Importance: Undecided
Assignee: Serge Hallyn (serge-hallyn)
Status: New
** Changed in: eucalyptus (Ubuntu)
Assignee: (unassigned) => Serge Hallyn (serge-hallyn)
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Virtio network stops working after dynamic virtio disk attachment
https://bugs.launchpad.net/bugs/602060
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