This is the command specified on docs.automotivelinux.org.
qemu-system-x86_64 -enable-kvm -m 2048 -hda agl-demo-platform-crosssdk-qemux86-64.wic.vmdk -cpu kvm64 -cpu qemu64,+ssse3,+sse4.1,+sse4.2,+popcnt -vga virtio -show-cursor -device virtio-rng-pci -serial mon:stdio -serial null -soundhw hda -net nic,vlan=0 -net user,hostfwd=tcp::2222-:22
[cherylfong@localhost Downloads]$ qemu-system-x86_64 -enable-kvm -m 2048 -hda agl-demo-platform-crosssdk-qemux86-64.wic.vmdk -cpu kvm64 -cpu qemu64,+ssse3,+sse4.1,+sse4.2,+popcnt -vga virtio -show-cursor -device virtio-rng-pci -serial mon:stdio -serial null -soundhw hda -net nic,vlan=0 -net user,hostfwd=tcp::2222-:22
qemu-system-x86_64: -net nic,vlan=0: 'vlan' is deprecated. Please use 'netdev' instead.