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How to build and run Cloud-hypervisor on AArch64

Cloud-hypervisor is partially enabled on AArch64 architecture. Although all features are not ready yet, you can begin to test Cloud-hypervisor on a AArch64 host by following this guide.

Prerequisites

On AArch64 machines, Cloud-hypervisor depends on an external library libfdt-dev for generating Flattened Device Tree (FDT).

The long-term plan is to replace libfdt-dev with some pure-Rust component to get rid of such dependency.

sudo apt-get update
sudo apt-get install libfdt-dev

Build

Using PCI devices requires GICv3-ITS for MSI messaging. GICv3-ITS is very common in modern servers.

cargo build --no-default-features --features kvm

Image

Download kernel binary and rootfs image from AWS.

wget https://s3.amazonaws.com/spec.ccfc.min/img/aarch64/ubuntu_with_ssh/fsfiles/xenial.rootfs.ext4 -O rootfs.ext4
wget https://s3.amazonaws.com/spec.ccfc.min/img/aarch64/ubuntu_with_ssh/kernel/vmlinux.bin -O kernel.bin

Containerized build

If you want to build and test Cloud Hypervisor without having to install all the required dependencies, you can also turn to the development script: dev_cli.sh.

To build the development container:

./scripts/dev_cli.sh build-container

To build Cloud-hypervisor in the container:

./scripts/dev_cli.sh build

Run

Assuming you have built Cloud-hypervisor with the development container, a VM can be started with command:

sudo build/cargo_target/aarch64-unknown-linux-gnu/debug/cloud-hypervisor --kernel kernel.bin --disk path=rootfs.ext4 --cmdline "keep_bootcon console=hvc0 reboot=k panic=1 root=/dev/vda rw" --cpus boot=4 --memory size=512M --serial file=serial.log --log-file log.log -vvv

If the build was done out of the container, replace the binary path with target/debug/cloud-hypervisor.