Device attach / detach problem for passthrough/SR-IOV in libvirt

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Hi all

I just encountered a problem in libvirt while was trying to attach and detach a sr-iov vf to my VM


The version of my libvirt is 1.1.1-0ubuntu8.5


I tried to attach the device using following xml


<interface type='hostdev' managed='yes'>

   <mac address='5c:01:fd:12:34:58'/>

   <source>

       <address type='pci' domain='0x0000' bus='0x04' slot='0x01' function='0x1'/>

   </source>

</interface>


When i attached device it worked properly and i managed to ping another host.


virsh # attach-device t5 1.xml

Device attached successfully


But when i detached it still i had network traffic in my VM but libvirt (virsh) said that


virsh # detach-device t5 1.xml

Device detached successfully


The next time i tried to attach it libvirt said that


virsh # attach-device t5 1.xml

error: Failed to attach device from 1.xml

error: Requested operation is not valid: PCI device 0000:04:01.1 is in use by domain t5


and when i continue this action after the ‘domain’ i receive some strange characters which might come from the memory space (memory content) like some addresses, links or some characters


I tried it with different VMs and different guest OSs that the same happend.


The same action was done with another host running libvirt version


Installed: 1.0.2-0ubuntu11.13.04.5~cloud1

Candidate: 1.0.2-0ubuntu11.13.04.5~cloud1


and it worked pretty OK. No problem.


Do you have any idea what is wrong?


More information:

Kernel : 3.8.0-37-generic


/etc/libvirt/qemu.conf :  security_driver = "none”


root@compute01:~# ethtool -i eth5

driver: bnx2x

version: 1.78.58

firmware-version: bc 7.4.22 phy 1.34

bus-info: 0000:04:00.1

supports-statistics: yes

supports-test: yes

supports-eeprom-access: yes

supports-register-dump: yes




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