./cloud-hypervisor --kernel ./hypervisor-fw --disk path=disk.img --cpus boot=4 --memory size=1024M --net "tap=,mac=,ip=,mask="
for kernel < 5.5 (without clone3() syscall )
./cloud-hypervisor --kernel ./hypervisor-fw --disk path=disk.img --cpus boot=4 --memory size=1024M --net "tap=,mac=,ip=,mask=" --serial tty --console off