arm64 Kernel build for qemu-system-aarch64 ?

Hi All, I want to build Linux Kernel 4.20 for arm64 and use it on qemu-arm64. I see that there is a defconfig available in arch/arm64/configs/defconfig But I am not sure whether it will work for qemu-arm64, and by default which machine type is supported. I already have working setup for qemu-arm for both versatile and vexpress machine. There is already a defconfig available for these under arch/arm. So I can build the kernel for it. But, whether these defconfig are supported for arm64 ? If anybody have setup for qemu-arm64 kernel, please share the steps. About rootfs, I am planning to use the arm32 version of busybox itself. Thanks, Pintu