Support Multiqueue virtio-net on VM

[Yusuke Suzuki]

What

XDP requires using isolated tx queues to avoid interference with the normal networking stack, but only one network device queue is available on VMs that Placemat sets up.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=672aafd5d88a951f394334802b938b502010d9eb

When Cilium's XDP acceleration is enabled on Placemat cluster, dmesg log shows:

virtio_net virtio0 eth0: XDP request 13 queues but max is 1. XDP_TX and XDP_REDIRECT will operate in a slower locked tx mode.

How

Support Multiqueue virtio-net on VM
https://www.linux-kvm.org/page/Multiqueue#Multiqueue_virtio-net

Checklist

• Finish implentation of the issue
• Test all functions
• Have enough logs to trace activities
• Notify developers of necessary actions