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[Xen-devel] Re: 2.6.30-rc3-tip kernel's backend network driver response

To: bderzhavets@xxxxxxxxx
Subject: [Xen-devel] 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)
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Mon, 11 May 2009 15:51:59 -0700
Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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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

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