Xen Dom0: universal snippet for XEN control domain
Overview
This snippet allows user to build Zephyr as a Xen initial domain (Dom0). The feature is implemented as configuration snippet to allow support for any compatible platform.
How to add support of a new board
add board dts overlay to this snippet which deletes/adds memory and deletes UART nodes;
add correct memory and hypervisor nodes, based on regions Xen picked for Domain-0 on your setup.
Programming
Correct snippet designation for Xen must
be entered when you invoke west build.
For example:
west build -b qemu_cortex_a53 -S xen_dom0 samples/synchronization
QEMU example with Xen
Overlay for qemu_cortex_a53 board, that is present in snippets/xen_dom0/boards/ directory of this snippet is QEMU Xen control domain example.
To run such setup, you need to:
fetch and build Xen (e.g. RELEASE-4.17.0) for arm64 platform
take and compile sample device tree from
example/directorybuild your Zephyr sample/application with
xen_dom0snippet and start it as Xen control domain
For starting you can use QEMU from Zephyr SDK by following command:
<path to Zephyr SDK>/sysroots/x86_64-pokysdk-linux/usr/bin/qemu-system-aarch64 -cpu cortex-a53 \
-m 6G -nographic -machine virt,gic-version=3,virtualization=true -chardev stdio,id=con,mux=on \
-serial chardev:con -mon chardev=con,mode=readline -pidfile qemu.pid \
-device loader,file=<path to Zephyr app build>/zephyr.bin,addr=0x40600000 \
-dtb <path to DTB>/xen.dtb -kernel <path to Xen build>/xen
This will start you a Xen hypervisor with your application as Xen control domain. To make it usable, you can add zephyr-xenlib by Xen-troops library to your project. It’ll provide basic domain management functionalities - domain creation and configuration.