[libvirt] how to assign an ip when assign a NIC or VF to the Virtual Machine?

[guan qin <qinguan0619 gmail com>]

Hi，
I use the Intel Virtualization Technology for Directed I/O(VT-d) or Single-Root I/O Virtualization(SR-IOV) to assign a network card or Virtual Function(VF) to a Virtual Machine(VM) to access the network by the hostdev element in libvirt Domain XML.

But the ethX in the VM hasn't an ip,I must to enter the VM to assign an ip 
to the VM manually.
So how can I assign an ip to the VM  when assign the NIC or VF to the VM ?thanks.

best regards,
qinguan