First thing first
Step 1: Check that the Intel Ethernet Server Adapter. For more information, do take a look at Using SR-IOV with Intel® Ethernet Server Adapters
In a nutshell, You blacklist the vf driver in the host, and enable the VFs as part of the kvm guests.
Step 1: Add a line /etc/modprobe.conf
options ixgbe max_vfs=8
The above configuration will create 8 Virtual Nics per Port. The Intel Card supports up to 64 FVs.
Step 2: Blacklist the ixgbevf driver by creating a file called /etc/modprobe.d/blacklist-ixgbevf.conf
Step 3: Reboot the machine