After Firmware Booting starts the ubuntu cloud image, there is no network in the virtual machine.

[lebron8dong]

./creat-cloud-init.sh
./target/release/cloud-hypervisor
--kernel ./hypervisor-fw
--disk path=focal-server-cloudimg-amd64.raw path=/tmp/ubuntu-cloudinit.img
--cpus boot=4
--memory size=1024M
--net "tap=,mac=,ip=,mask="

[liuw]

You should see a virtio-net device in the guest, but you have to configure the interface yourself.