Thanks for the response. I have just checked and virtio drivers are already installed and it's still showing 1G interface instead of 10G.
here is the output of dumpxml -
So i have recently deployed few instances on KVM. My backend NIC's are 10G but when i deploy any instance in KVM hypvervisor. All of window's instances are now showing only 1G NIC speed.
This happened with VMware too, but it was resolved the moment i have changed NIC adaptor from...