[libvirt-users] How to device port on the controller

[Martin Kletzander]

[please don't top-post on technical lists]

On 04/09/2013 03:19 PM, Daniele Testa wrote:
> Hi,
> 
> Actually, the serial is not there :)
> 

Works for me, but that's a new qemu, new libvirt and new fedora guest,
see below.

> Btw, as you can see in the XML, libvirt and/or KVM is completely ignoring
> my target="vdb" and attaches the drive to "/dev/vdi" inside the virtual
> server.

Yes, this is an issue, but we do state in the documentation that the
target attribute is just a hint as to where to plug the disk and we
currently cannot guarantee the disk name precisely.

> 
> (root at h2)-(/)# virsh --version
> 0.7.5
> 

This version is very old and even though the serial element is
supported, ...

> (root at h2)-(/)# kvm --version
> QEMU PC emulator version 0.12.3 (qemu-kvm-0.12.3), Copyright (c) 2003-2008
> Fabrice Bellard
> 

... it might not be for such old qemu.

> The log-file only shows the command used to start the virtual server. It
> does not contain any of the commands I used to attache the additional disk.
> 

And that command would help identify whether we start qemu with the
serial parameter (which I doubt with such old implementation) or not.

> Regards,
> Daniele
> 
> 
> 2013/4/9 Martin Kletzander <mkletzan at redhat.com>
> 
>> On 04/08/2013 11:58 PM, Daniele Testa wrote:
>>> Hi,
>>>
>>> I am adding a disk to my KVM virtual server, but for some reason it
>> refuses
>>> to honor the <address>
>>>
>>> I have tried the following 3:
>>>
>>>     <disk type='block' device='disk'>
>>>       <driver name='phy' type='raw'/>
>>>       <source dev='/dev/nbd2'/>
>>>       <target dev='vdb' bus='virtio'/>
>>>       <serial>my-fake-serial</serial>
>>>       <address type='drive' controller='0' bus='1' target='3' unit='2'/>
>>>     </disk>
>>>
>>>
>>>     <disk type='block' device='disk'>
>>>       <driver name='phy' type='raw'/>
>>>       <source dev='/dev/nbd2'/>
>>>       <target dev='vdb' bus='virtio'/>
>>>       <serial>my-fake-serial</serial>
>>>       <address type='pci' bus='0x00' slot='0x08' function='0x0'/>
>>>     </disk>
>>>
>>>
>>>     <disk type='block' device='disk'>
>>>       <driver name='phy' type='raw'/>
>>>       <source dev='/dev/nbd2'/>
>>>       <target dev='vdb' bus='virtio'/>
>>>       <serial>my-fake-serial</serial>
>>>       <address type='virtio-serial' controller='0' bus='0' port='8'/>
>>>     </disk>
>>>
>>> I would assume the last one is the one to use, as I am using a "virtio"
>>> bus. However, the <address> attribute is simply ignored and the disk is
>>> always attached as this:
>>>
>>> pci-0000:00:05.0
>>>
>>> Further, how do I read the "my-fake-serial" from within the virtual
>> machine?
>>>
>>
>> The serial for vdb for example is in /sys/class/block/vdb/serial
>>
>> I know I haven't helped with the addresses, don't know much about that,
>> but try attaching your libvirt version and the log of
>> /var/log/libvirt/qemu/<machine_name>.log.
>> I'll see when I'll get to you.  Maybe somebody will found out in the
>> meantime.  If not, feel free to create a bug for this.
>>
>> Martin
>>
> 
> 
> 
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