[Bug 602060] [NEW] Virtio network stops working after dynamic virtio disk attachment

[Ye Wen]

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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