QEMU device setup

LAVA can use qemu as a DUT and run test inside QEMU.

Create device-type

Create the device type using the name qemu.

Create device

1. Add the device using the following settings:
   • Device Type: qemu
   • Hostname: A unique name (e.g., qemu-01)

2. Add the device configuration.

   For a simple qemu job, this device dictionary would work:

   ```jinja {% extends "qemu.jinja2" %}

   {% set netdevice = "user" %} {% set memory = 1024 %} ```

   Tip

   If /dev/kvm is unavailable on the worker, add {% set no_kvm = True %} to the dictionary.

Submit a job

Submit this simple test job:

```yaml device_type: qemu job_name: simple qemu job

timeouts: job: minutes: 20 priority: medium visibility: public

context: arch: amd64

actions: - deploy: to: tmpfs timeout: minutes: 20 images: rootfs: url: http://images.validation.linaro.org/kvm/debian-sid-2014_08_21-amd64.qcow2.xz image_arg: -drive format=qcow2,file={rootfs} compression: xz os: debian

• boot: method: qemu media: tmpfs timeout: minutes: 5 prompts:

  • 'root@debian:~#' auto_login: login_prompt: "login:" username: root

• test: timeout: minutes: 5 definitions:

  • repository: https://github.com/Linaro/test-definitions from: git path: automated/linux/smoke/smoke.yaml parameters: SKIP_INSTALL: true name: smoke-tests
  • repository: https://github.com/Linaro/test-definitions from: git path: automated/linux/meminfo/meminfo.yaml parameters: SKIP_INSTALL: true name: meminfo

```

The job page will look like this.

Configure bridged network

For qemu-nfs and qemu-iso boot methods, netdevice must be set to tap in either the job context or the device dictionary. The tap interface must be linked to a bridged interface that provides access to the worker and maybe also the Internet.

If the network bridge is not configured yet, follow the steps below to create one.

Note

These instructions are only validated on Debian. You may need to adjust them for other distributions.

1. Install required packages:

   bash sudo apt install iproute2 dnsmasq

2. Create the bridge:

   bash sudo ip link add name br-lava type bridge sudo ip addr add 192.168.66.1/24 dev br-lava sudo ip link set br-lava up

3. Make the bridge persistent:

   bash sudo mkdir -p /etc/network/interfaces.d sudo tee /etc/network/interfaces.d/br-lava > /dev/null <<'EOF' auto br-lava iface br-lava inet static address 192.168.66.1 netmask 255.255.255.0 bridge_ports none bridge_stp off EOF

4. Enable DHCP for the bridge:

   bash sudo tee /etc/dnsmasq.d/br-lava.conf > /dev/null << 'EOF' interface=br-lava bind-interfaces dhcp-range=192.168.66.2,192.168.66.100,12h dhcp-option=option:router,192.168.66.1 dhcp-option=option:dns-server,8.8.8.8 except-interface=lo port=0 EOF sudo systemctl restart dnsmasq

5. Configure QEMU to use the bridge:

   ```bash sudo cp /etc/qemu-ifup /etc/qemu-ifup.original sudo tee /etc/qemu-ifup > /dev/null << 'EOF'

   !/bin/sh -ex

   TAP="$1" BRIDGE=br-lava

   ip link set "$TAP" up ip link set "$TAP" master "$BRIDGE" EOF ```

6. Optionally, allow the br-lava interface to access the Internet.

   Add NAT masquerading rules:

   shell sudo iptables -t nat -A POSTROUTING -o <eth0> -j MASQUERADE sudo iptables -A FORWARD -i br-lava -o <eth0> -j ACCEPT sudo iptables -A FORWARD -i <eth0> -o br-lava -m state --state RELATED,ESTABLISHED -j ACCEPT

   Note

   Replace <eth0> with the name of the interface that provides Internet access.

   Make rules persistent:

   shell sudo apt-get install -y iptables-persistent sudo netfilter-persistent save