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Re: [libvirt] Cannot enumerate physical devices with libvirt 0.7.6



On 02/16/2010 05:11 PM, Frédéric Grelot wrote:
Hi Dave and all

have four on my test system, which I just installed.  How did you
install the box, install F12, then what?  Just to rule this out, did
you rebuild the RPM?

I first built it from source (0.7.6), but, when the package was released in rawvirt (repo enabled in my system), I uninstalled my version ("make uninstall" in the directory where I installed it from), then installed that of rawvirt...
When I started having these problems, I uninstalled / reinstalled again, but it didn't change anything.

Well... you solved my problem anyway : to sort this out, I tried that again. Thus I noticed that after having uninstalled everything (yum remove + make uninstall), the "libvirtd" command still "worked" (with errors). I checked... and there was a /sbin/libvirtd, left by I-don-t-know-which install! . It was one of those last, undoubtly, since "libvirtd --version"  actually returned 0.7.6... (And, of course, in the default PATH, /sbin stands before /usr/bin/...)
I removed (=backuped just in case...) it, installed with yum, and it works at last!

Thanks for your help, you got me to the right path... And sorry for the inconvenient of a "custom" install...

Glad it's working for you now.

However, I don't explain why this libvirtd was left there... Were the paths changed lately?

It's possible to leave files installed if you install to one prefix and then install to a second location without uninstalling the first. If you re-execute configure the location of any existing installation is lost.

Dave


Frederic


----- "Dave Allan"<dallan redhat com>  a écrit :

On 02/16/2010 03:04 PM, Frédéric Grelot wrote:
Yep, here is what I get (see at the end) :

(snip)

I think the times when I get those lines matches with my "virsh
nodedev-list" requests (or something like this : virt-manager tries to
create a vm, add hardware...).

Does this help?

That's odd, you only have two entries in the node driver array, and I

have four on my test system, which I just installed.  How did you
install the box, install F12, then what?  Just to rule this out, did
you
rebuild the RPM?

Frederic.


----- "Dave Allan"<dallan redhat com>   a écrit :

On 02/16/2010 03:00 AM, Frédéric Grelot wrote:
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.

Ok, sorry... At least I ensured that udev itself is on...

    In any of your logs when you have libvirt debug logging
turned on, do you see the message:

Registering udev node device backend

Nope, I checked in /var/log/* and libvirt.log in debug mode
(which,
after 1 1/2 day of "debug" activity enabled, is already 2Gb!)
There is no mention of udev. I think it means that the udev
driver
is not loaded in libvirt? How could enable it then? (or produce
some
message telling me why it is not) ?


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.

OK, I'll wait for your suggestions...

Do you see messages like:


14:35:01.849: debug : do_open:1205 : node driver 0 Test returned
DECLINED
14:35:01.849: debug : do_open:1205 : node driver 1 ESX returned
DECLINED
14:35:01.849: debug : do_open:1205 : node driver 2 remote returned
DECLINED
14:35:01.849: debug : do_open:1205 : node driver 3
udevDeviceMonitor
returned SUCCESS

in your debug log?


Frederic.



Have you any other Idea?
Frederic.


----- "Daniel P. Berrange"<berrange 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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