Re: automatically detaching PCI host devices from guest for SRIOV usage.

[Alex Jia <ajia@xxxxxxxxxx>]

On 08/20/2012 08:34 PM, Rajesh Kumar Mallah wrote:

Dear List ,

We are using intel 82599EB based SRIOV capable 10GbE cards
on the host machine.The VFs are being assigned to the guest 
in pass through mode and are providing the network connectivity 
as expected.

However when we shutdown the guest the connectivity does not
comes back via the VFs on the guest in next boot unless
the VFs are detached from the *guest* *before* initiating a
shutdown of the guests.

Dear Rajesh,

Please see the following comments.

( 
the detach is explicitly done via virsh command 
/usr/local/libvirt/bin/virsh  detach-device guest01   ~/nic.xml
nic.xml contained
<hostdev mode='subsystem' type='pci' managed='yes'>
   <source>
      <address domain='0x0000' bus='0x04' slot='0x10' function='0x0'/>
   </source>
   <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</hostdev>
)

The question is anyone else facing similar problem and
if so what solution was used?

Secondly , is there anyway to automate the detaching of the
VFs from the guest when the guest is put in the shutdown 
sequence ? (or for that matter destroyed).

When managed is "yes" for a PCI device, it is automatically detached from the host before being passed on to the guest, and automatically reattached to the host after the guest exits such as shutdown a guest.

Regards,
Alex

Regards,
Rajesh Kumar Mallah
Tel. 91-11-46710500 (Ext:303)
Cell +919811255597
Website: http://www.tradeindia.com/
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