Thanks for the work, wouldn't it make more sense to name it "XCP-ng Center 20.01" ? Just my 2cents.

Import the .xva and there build the module. When you get the .ko file, copy that to your host server. Then do a

install -d /lib/modules/<KERNEL_VERSION>/kernel/drivers/net
install -m 644 tn40xx.ko /lib/modules/<KERNEL_VERSION>/kernel/drivers/net
depmod <KERNEL_VERSION>

Reboot the host and then check if it was loaded with:

lsmod | grep tn40xx

Don't forget to optimze for 10Gb: https://darksideclouds.wordpress.com/2016/10/10/tuning-10gb-nics-highway-to-hell/
and https://www.kernel.org/doc/ols/2009/ols2009-pages-169-184.pdf