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Compiling a kernel for QEMU with graphics support

This repository shows you how to cross-compile(on amd64) an arm64/aarch64 Kernel for QEMU with graphics support

1.) We install dependencies:

 apt update -y && apt install -y git bc bison flex libssl-dev make libc6-dev libncurses5-dev crossbuild-essential-arm64

2.) We clone the latest availible Kernel from https://github.com/torvalds/linux and change to its directory:

 git clone --depth=1 https://github.com/torvalds/linux
 cd linux

3.) We make a standard defconfig for arm64

 yes "" | make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- defconfig

4.) We configure it to support a graphical QEMU boot with:

 scripts/config -e CONFIG_MACVLAN
 scripts/config -e CONFIG_VIRTIO_NET
 scripts/config -e CONFIG_NLMON
 scripts/config -d CONFIG_VT_HW_CONSOLE_BINDING
 scripts/config -e CONFIG_SERIAL_AMBA_PL011
 scripts/config -e CONFIG_SERIAL_AMBA_PL011_CONSOLE
 scripts/config -e CONFIG_VIRTIO_CONSOLE
 scripts/config -e CONFIG_HW_RANDOM
 scripts/config -e CONFIG_HW_RANDOM_VIRTIO
 scripts/config -e CONFIG_DRM
 scripts/config -e CONFIG_DRM_VIRTIO_GPU
 scripts/config -e CONFIG_RTC_CLASS
 scripts/config -e CONFIG_RTC_DRV_PL031
 scripts/config -e CONFIG_VIRTIO_PCI
 scripts/config -e CONFIG_VIRTIO_MMIO
 scripts/config -e CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES
 scripts/config -e CONFIG_MAILBOX
 scripts/config -e CONFIG_AHCI
 scripts/config -e CONFIG_PCIEPORT
 scripts/config -e CONFIG_VIRTIO_INPUT
 scripts/config -e CONFIG_VIRT_DRIVERS
 scripts/config -e CONFIG_VIRTIO_MEM

5.) We cross-compile the Kernel for arm64 on a AMD64-Machine

 yes "" | make -j ${CPUS} ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- Image.gz

This kernel supports QEMU's graphic card provided by:

 qemu-system-aarch64 -m virt \
   -kernel arch/arm64/boot/Image.gz \
   -append "root=/dev/vda1 rw" \
   -initrd YOUR_INITRD_IMAGE \
   -cpu cortex-a76 \
   -drive if=none,file=YOUR_ROOTFS_IMAGE,format=raw,id=disk
   -device virtio-blk-device,drive=disk \
   -device virtio-gpu-pci \
   -display gtk,gl=on,show-cursor=on \
   -device virtio-mouse-pci \
   -device virtio-keyboard-pci \