[libvirt] Cannot enumerate physical devices with libvirt 0.7.6

[Dave Allan]

On 02/15/2010 02:30 PM, Frédéric Grelot wrote:
> The udev driver is actually fully loaded, I even entered "udevadm
> monitor" in a console, and it reacted as expected when I
> plugged/unplugged an usb mouse... There is nothing about it in
> dmesg/boot/message.log, nor libvirt.log (I set up libvirt daemon to
> log at debug level in /var/log/libvirt/libvirt.log).

Daniel was referring to the libvirt udev driver--the libvirt code that 
interacts with udev--not to udev itself, which is what you're testing 
with udevadm.  In any of your logs when you have libvirt debug logging 
turned on, do you see the message:

Registering udev node device backend

> By the way, I noticed that libvirt generates tons of "error :
> qemuMonitorTextGetBlockStatsInfo:698 : invalid argument in no stats
> found for device virtio-diskX" while virt-manager is running (it
> stops as soon as I stop virt-manager). Is it linked with the bug I
> saw on the list about libvirt taking over memory after time isn't
> it?

These messages are the result of not being able to find the device, 
which is consistent with the other things you're seeing.  These are all 
symptoms of the node device code not running.

> Have you any other Idea?
> Frederic.
>
>
> ----- "Daniel P. Berrange"<berrange at redhat.com>  a écrit :
>
>> On Fri, Feb 12, 2010 at 08:05:21PM +0100, Fr?d?ric Grelot wrote:
>>> Hi all,
>>>
>>> I often update my F12 box with the rawvirt repository, which
>>> just
>> installed libvirt 0.7.6. Since that, I cannot enumerate physical
>> devices (and thus get a beautiful error when I start one of my vms
>> that should use a USB device).
>>>
>>> I don't think I changed anything else on that box, and, of
>>> course, I
>> already restarted the libvirt daemon.
>>> I haven't restarted the server itself, because it is currently
>>> used,
>> but I could do it if necessary...
>>>
>>> I make good use of the qemu hypervisor, and I'm looking forward
>>> to
>> solve this issue!
>>>
>>> Frederic.
>>>
>>> # libvirtd --version libvirtd (libvirt) 0.7.6
>>>
>>> # virsh --version 0.7.6
>>>
>>> # virsh nodedev-list error :Failed to count node devices error
>>> :this function is not supported by the hypervisor:
>> virNodeNumOfDevices
>>
>> It would appear that the udev driver failed to start - there are
>> probably messages in syslog about the problem
>>
>>
>> Regards, Daniel -- |: Red Hat, Engineering, London   -o-
>> http://people.redhat.com/berrange/ :| |: http://libvirt.org  -o-
>> http://virt-manager.org  -o- http://ovirt.org :| |:
>> http://autobuild.org       -o- http://search.cpan.org/~danberr/ :|
>> |: GnuPG: 7D3B9505  -o-  F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742
>> 7D3B 9505 :|
>
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