/opt/qemu-2.2.0/bin/qemu-system-x86_64 -nographic -drive file=virtioa.qcow2,if=virtio,bus=0,unit=0,cache=none -machine type=pc-1.0,accel=kvm -serial mon:stdio -nographic -nodefconfig -nodefaults -rtc base=utc -cdrom /tmp/abc/csr1000v-universalk9.16.03.03.iso -boot order=dc -m 3072