Xen on ARM and Yocto

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Follow these instructions to cross-compile a minimal Dom0 initramfs, with all the Xen tools, for ARM64 platforms. The build runs on x86 machines, while the target is ARM64. In this example, we are targeting Xilinx Zynq MPSoCs.

Firstly clone the yocto and meta-virtualization repositories and checkout the right branches. Here we are using the krogoth release. 

git clone http://git.yoctoproject.org/git/poky
cd poky
git checkout -b krogoth origin/krogoth

git clone https://git.yoctoproject.org/git/meta-virtualization
cd meta-virtualization
git checkout -b krogoth origin/krogoth
cd ..

git clone git://git.openembedded.org/meta-openembedded
cd meta-openembedded
git checkout -b krogoth origin/krogoth
cd ..

The following is specific to Xilinx: 

git clone https://github.com/Xilinx/meta-xilinx.git
cd meta-xilinx
git checkout -b krogoth origin/krogoth
cd ..

Add xen_4.8.0.bb to meta-virtualization/recipes-extended/xen, make sure to edit the file to specify the git url, branch and revision you want to be built. Then execute: 

source oe-init-build-env

Manually edit conf/bblayers.conf, add the following, where /local/repos/yocto is the directory where you cloned poky previously: 

BBLAYERS ?= " \
  /local/repos/yocto/poky/meta \
  /local/repos/yocto/poky/meta-poky \
  /local/repos/yocto/poky/meta-yocto-bsp \
  /local/repos/yocto/poky/meta-openembedded/meta-oe \
  /local/repos/yocto/poky/meta-openembedded/meta-python \
  /local/repos/yocto/poky/meta-openembedded/meta-networking \
  /local/repos/yocto/poky/meta-virtualization \
  /local/repos/yocto/poky/meta-xilinx \
  "

Edit conf/local.conf, add the following, making sure to set MACHINE to your target platform (here we are using zcu102-zynqmp as reference): 

MACHINE ??= "zcu102-zynqmp"
IMAGE_INSTALL_append = " dropbear"

INITRAMFS_IMAGE = "core-image-minimal"
INITRAMFS_IMAGE_BUNDLE = "1"
IMAGE_FSTYPES += "cpio.gz"
  
DISTRO_FEATURES_append=" xen"
IMAGE_INSTALL_append = " dropbear xen-base zlib-dev libsdl libsdl-mixer"
ASSUME_PROVIDED += "iasl-native"

Finally lunch the build! 

bitbake core-image-minimal

The output will be under build/tmp/deploy/images.

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