Re: 2.6.30-rc3-tip kernel's backend network driver response when loading Xen 3.4 Dom0 on Ubuntu 9.04 Server (Ubuntu Desktop installed)

[Jeremy Fitzhardinge <jeremy@goop.org>]

Boris Derzhavets wrote:
> Last lines of dmesg report Xen 3.4 (2.6.30-rc3-tip) instance been 
> built on Ubuntu 9.04 Server ( IP6v by default)
>
> [   29.214154] skge eth0: enabling interface
> [   29.218498] ADDRCONF(NETDEV_UP): eth0: link is not ready
> [   29.630012] eth1: no IPv6 routers present
> [   38.012544] sky2 eth1: disabling interface
> [   38.092791] sky2 peth1: enabling interface
> [   38.093450] ADDRCONF(NETDEV_UP): peth1: link is not ready
> [   39.776997] sky2 peth1: Link is up at 100 Mbps, full duplex, flow 
> control both
> [   39.777643] ADDRCONF(NETDEV_CHANGE): peth1: link becomes ready
> [   40.145017] device peth1 entered promiscuous mode
> [   40.182778] eth1: topology change detected, propagating
> [   40.182783] eth1: port 1(peth1) entering forwarding state
> [   49.820430] xenbus_probe wake_waiting
> [   49.820491] xenbus_probe wake_waiting
> [   49.829859] XENBUS: Unable to read cpu state
> [   49.831443] XENBUS: Unable to read cpu state
> [   49.831633] XENBUS: Unable to read cpu state
> [   49.831851] XENBUS: Unable to read cpu state
> [   49.832132] xenbus_probe_devices backend
> [   49.832283] xenbus_probe_devices failed xenbus_directory
> [   49.832331] backend_probe_and_watch devices probed ok
> [   49.832494] backend_probe_and_watch watch add ok ok
> [   49.832541] backend_probe_and_watch all done
> [   49.832581] xenbus_probe_devices device
> [   49.832731] xenbus_probe_devices failed xenbus_directory
> [   49.832777] frontend_probe_and_watch devices probed ok
> [   49.832948] frontend_probe_and_watch watch add ok ok
> [   49.832995] frontend_probe_and_watch all done
> [   49.910018] peth1: no IPv6 routers present
> [   51.062517] eth1: no IPv6 routers present
> [  173.299352] vif1.0 (vif): not using net_device_ops yet
>
> Last lines of dmesg report Xen 3.4 (2.6.30-rc3-tip) instance been 
> built on Ubuntu 8.10
>
>
> [   54.856147] sky2 peth0: enabling interface
> [   54.856810] ADDRCONF(NETDEV_UP): peth0: link is not ready
> [   55.777286] skge eth1: enabling interface
> [   55.781784] ADDRCONF(NETDEV_UP): eth1: link is not ready
> [   56.521131] sky2 peth0: Link is up at 100 Mbps, full duplex, flow 
> control both
> [   56.521765] ADDRCONF(NETDEV_CHANGE): peth0: link becomes ready
> [   56.905093] device peth0 entered promiscuous mode
> [   56.917357] eth0: topology change detected, propagating
> [   56.917362] eth0: port 1(peth0) entering forwarding state
> [   64.531928] xenbus_probe wake_waiting
> [   64.531984] xenbus_probe wake_waiting
> [   64.542317] XENBUS: Unable to read cpu state
> [   64.542486] XENBUS: Unable to read cpu state
> [   64.542661] XENBUS: Unable to read cpu state
> [   64.542828] XENBUS: Unable to read cpu state
> [   64.543137] xenbus_probe_devices backend
> [   64.543313] xenbus_probe_devices failed xenbus_directory
> [   64.543356] backend_probe_and_watch devices probed ok
> [   64.543514] backend_probe_and_watch watch add ok ok
> [   64.543557] backend_probe_and_watch all done
> [   64.543599] xenbus_probe_devices device
> [   64.543776] xenbus_probe_devices failed xenbus_directory
> [   64.543818] frontend_probe_and_watch devices probed ok
> [   64.543972] frontend_probe_and_watch watch add ok ok
> [   64.544021] frontend_probe_and_watch all done
> [   67.040013] peth0: no IPv6 routers present
> [   67.890015] eth0: no IPv6 routers present
> [  118.012469] vif1.0 (vif): not using net_device_ops yet
> [  118.127252] device vif1.0 entered promiscuous mode
> [  118.130694] eth0: topology change detected, propagating
> [  118.130701] eth0: port 2(vif1.0) entering forwarding state
> [  122.657298] blkback: ring-ref 8, event-channel 9, protocol 1 
> (x86_64-abi)
> [  128.700025] vif1.0: no IPv6 routers present
> [  183.761252] eth0: port 2(vif1.0) entering disabled state
> [  183.800702] eth0: port 2(vif1.0) entering disabled state
>
> Line:-
>
> [  122.657298] blkback: ring-ref 8, event-channel 9, protocol 1 
> (x86_64-abi)
>
> is absent in first report. I believe it's a Dom0's kernel message from 
> network
> backend driver. Instances dual boot on the same box.
>

I've seen similar things when building xenbus as modules; the backend 
modules don't get auto-loaded.  Either compiling them non-modular or 
manually loading the modules works.

If that doesn't work, I'm not sure what's going on.

    J