Re: [Users] Ovirt - double use of PCI Address

Mohsen Saeedi Tue, 05 Jun 2012 08:34:29 -0700

Ok. thanks. I'm trying to do all of the under my home server with Ovirt. I'll update you about any problem in this case.

Oved Ourfalli <ov...@redhat.com> wrote on Tue, 05 Jun 2012 11:20:03 -0400 (EDT):


----- Original Message -----

From: "Mohsen Saeedi" <mohsen.sae...@gmail.com>
To: "Oved Ourfalli" <ov...@redhat.com>
Cc: users@ovirt.org, "Igor Lvovsky" <ilvov...@redhat.com>
Sent: Tuesday, June 5, 2012 6:10:30 PM
Subject: Re: [Users] Ovirt - double use of PCI Address






Hi Again

I just defined new server on Ovirt admin portal. I think define
monitor is for desktop virtualization. is it true?

I switched more than two time between spice and vnc. do you think
switching between vnc and spice is the reason for this problem?

And did the problem occur?
Trying to reproduce it now and I can't, although I seem to have some VMs with more than one monitor in the vm_device table, but all have this property set to 1.
I'll update you in case I understand the reason. If you have a solid reproduction then please share it.

Thank you,
Oved

I'm going to delete extra video card. but it's very interesting for
me to know about reason of this problem.




Thanks

Oved Ourfalli <ov...@redhat.com> wrote on Tue, 05 Jun 2012 10:16:07
-0400 (EDT):

----- Original Message -----

From: "Mohsen Saeedi" <mohsen.sae...@gmail.com> To: "Oved Ourfalli"
<ov...@redhat.com> Cc: users@ovirt.org , "Igor Lvovsky"
<ilvov...@redhat.com> Sent: Tuesday, June 5, 2012 5:06:55 PM
Subject: Re: [Users] Ovirt - double use of PCI Address





Thanks. But i didn't add 3 video card! why there is 3 video card?is
it bug? Basically the number of devices should grow or shrink,
according to the number of monitors you choose in the VM properties.
If it has more then it is a bug.
I'll take a look at it.

can you please explain more about how can i fix this problem? i must
go to the database and then i leave the address as is? i don't
understand last your sentence.
Thanks for you attention. Thinking of it, if you don't want 3 devices
you can just delete two of the three video controllers in order to
workaround the issue.
In order to do that you'll have to do the following in the database:
1. Find the vm_id of your VM. You can do that by looking at the
vm_static table.
2. Then, in the vm_device table, find the video devices.
3. Delete two of the three devices.

Let me know if you need more help.

Oved Ourfalli <ov...@redhat.com> wrote on Tue, 05 Jun 2012 10:01:00
-0400 (EDT):

----- Original Message -----

From: "Mohsen Saeedi" <mohsen.sae...@gmail.com> To: "Oved Ourfalli"
<ov...@redhat.com> Cc: users@ovirt.org Sent: Tuesday, June 5, 2012
4:42:09 PM
Subject: Re: [Users] Ovirt - double use of PCI Address



/*Oved Ourfalli <ov...@redhat.com> */ wrote on Tue, 05 Jun 2012
09:29:19
-0400 (EDT):

----- Original Message -----

From: "Mohsen Saeedi" <mohsen.sae...@gmail.com> To: users@ovirt.org
Sent: Tuesday, June 5, 2012 4:24:46 PM
Subject: [Users] Ovirt - double use of PCI Address





Hi

I setup ovirt and some other things. I make a virtual machine
(CentOS
6.2). installed and configured it. then power off it and make a
snapshot and create clone image from it.

when i trying to start new machine, i got this error:

2012-06-05 13:16:15.433+0000: 2375: error :
qemuCollectPCIAddress:743
: XML error: Attempted double use of PCI Address '0:0:2.0'

I remove the new machine and try to start old machine. i get the
error again! and i'm enable to start old machine. Can you please
attach the engine.log and vdsm.log files? Yes, I attached both of
them.

Are you working with the most updated upstream code? I'm working with
build from git -
faef6297b0d01203e88040b2707f9abfbd754d3f. more information is
available
here: http://www.dreyou.org/ovirt/ You can see the issue in vdsm.log
file. You have 3 video cards, all on the same address.

		<video>
			<address  domain="0x0000"  function="0x0"  slot="0x02"  type="pci"
			bus="0x00"/>
			<model heads="1" type="qxl" vram="65536"/>
		</video>
		<video>
			<address  domain="0x0000"  function="0x0"  slot="0x02"  type="pci"
			bus="0x00"/>
			<model heads="1" type="qxl" vram="65536"/>
		</video>
		<video>
			<address  domain="0x0000"  function="0x0"  slot="0x02"  type="pci"
			bus="0x00"/>
			<model heads="1" type="qxl" vram="65536"/>
		</video>

Looking at the vdsm code (in vdsm/libvirtvm.py), you can see why such
a thing might happen (also look at the FIXME comment :-) ).

            # FIXME. We have an identification problem here.
            # Video card device has not unique identifier, except the
            alias
            # (but backend not aware to device's aliases).
            # So, for now we can only assign the address according to
            devices order.
            for vc in self._devices[vm.VIDEO_DEVICES]:
                if not hasattr(vc, 'address') or not hasattr(vc,
                'alias'):
                    vc.alias = alias
                    vc.address = address
                    break
            # Update vm's conf with address
            for dev in self.conf['devices']:
                if (dev['type'] == vm.VIDEO_DEVICES) and \
                   (not dev.get('address') or not dev.get('alias')):
                    dev['address'] = address
                    dev['alias'] = alias
                    break

The code above is responsible to return the engine core the device
addresses, after libvirt executes the VM, so that they will be
persistent, and used in future executions of the VM.

Now, the engine core is aware of the alias (as of the exact commit
you used :-) ), but the first time you run the VM, you can get the
addresses wrong, as the alias isn't taken into account.

Would you like to try to fix this issue? The fix will be to make a
better logic in the code above. Similar examples can be found in
this file, for example in the section that does the same for
controllers.

If not, let me know and I'll go ahead and fix that.

In the meantime, you can workaround this issue by going to the
vm_device table, identifying these three devices, leave the address
as is for the first video card of your VM (you probably have
video0/1/2 as aliases), and try to run the VM again.
Now, the engine will pass the one with the correct address as the
first, and libvirt will allocate the right addresses to the other
two.
Hopefully this will be enough.

Oved



We had an issue with the monitors, in which the order of the
monitor devices is important, as the first one needs to get the
address 0:0:2.0, but that issue was fixed.
Are you using more than one monitor? No, I'm using spice or vnc just
for getting graphic.

The vdsm.log fill will help a lot here, as it contains the VM's
domain XML file, which will show us all the devices we send
libvirt, and all the addresses that the engine expects to get from
it.

Any idea?

Thanks.


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Re: [Users] Ovirt - double use of PCI Address

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