cloud-hypervisor/docs/arm64.md

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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.
```bash
sudo apt-get update
sudo apt-get install libfdt-dev
```
## Build
Before building, a hack trick need to be performed to get rid of some build error in vmm component. See [this](https://github.com/cloud-hypervisor/kvm-bindings/pull/1) for more info about this temporary workaround.
```bash
sed -i 's/"with-serde",\ //g' hypervisor/Cargo.toml
```
For Virtio devices, you can choose MMIO or PCI as transport option.
### MMIO
```bash
cargo build --no-default-features --features mmio,kvm
```
### PCI
Using PCI devices requires GICv3-ITS for MSI messaging. GICv3-ITS is very common in modern servers, but your machine happen to be old ones with GICv2(M) (like Raspberry Pi 4) or GICv3 without ITS, MMIO can still work.
```bash
cargo build --no-default-features --features pci,kvm
```
## Image
Download kernel binary and rootfs image from AWS.
```bash
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:
```bash
./scripts/dev_cli.sh build-container
```
To build Cloud-hypervisor in the container: (The default option for Virtio transport is MMIO.)
```bash
./scripts/dev_cli.sh build
```
## Run
Assuming you have built Cloud-hypervisor with the development container, a VM can be started with command:
```bash
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 pci=off 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`.