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Configuration

The following sections are supported:

[[target]]

Each target is specified using a [[target]] section. In TOML, this is known as an array of tables.

The following fields are supported:

  • name (string)

    • Required field
    • The name of the target. The name is used for documentation and identification purposes.

  • image (string)

    • Optional field, but one of image and kernel must be specified
    • The path to the virtual machine disk image
    • If a relative path is provided, it will be interpreted as relative to vmtest.toml
    • Format is auto-detected by QEMU.

  • uefi (boolean)

    • Default: false
    • Whether to use UEFI boot or not
    • false implies BIOS boot

  • kernel (string)

    • Optional field, but one of image and kernel must be specified
    • The path to the kernel to use
    • Typically named vmlinuz or bzImage
    • If a relative path is provided, it will be interpreted as relative to vmtest.toml
    • See the notes in the README for kernel features that are required.

  • kernel_args (string)

    • Optional field
    • kernel must be specified
    • Additional kernel command line arguments to append to vmtest generated kernel arguments

  • rootfs (string)

    • Directory, default: /
    • kernel must be specified
    • Path to rootfs to test against. Will be mounted in the guest using a filesystem protocol that's convenient for virtualisation, such as 9p.
    • If a relative path is provided, it will be interpreted as relative to vmtest.toml
    • UIDs from the host will be passed through directly; if you built your rootfs without privileges in the host, try running vmtest via unshare -r, so that QEMU (and hence the guest) sees UID 0.
    • For tips on creating a rootfs (if you don't want to just use your host system's one), see rootfs.md.

  • arch (string)

    • Default: the architecture vmtest was built for.
    • Under which machine architecture to run the kernel.

  • command (string)

    • Required field
    • Command to run inside VM
    • Note that the specified command is run inside a bash shell by default
    • vmtest's environment variables are also propagated into the VM during command execution

  • vm (VMConfig)

    • Optional sub-table
    • Configures the VM.
    • See the VMConfig struct below.

[[target.vm]]

The VMConfig struct that configures the QEMU VM.

  • num_cpus (int)
    • Optional field
    • Number of CPUs in the VM.
    • Default: 2
  • memory (string)
    • Optional field
    • Amount of RAM for the VM.
    • Accepts a QEMU parsable string for the -m flag like 256M or 4G.
    • Default: 4G
  • mounts (Map<String, Mount>)
    • Optional sub-table
    • Map of additional host mounts for the VM.
    • Key is the path in the VM and the value contains information about the host path.
    • See below for definition of the Mount object.
  • bios (string)
    • Optional field
    • Path to the BIOS file.
    • This is only used if the UEFI flag from target is true.
  • extra_args (List)
    • Optional field
    • Extra arguments to pass to QEMU.

[[target.vm.mounts]]

The Mount struct for defining additional host mounts into the VM.

  • host_path (string)
    • Required field
    • Path on the host.
    • If a relative path is provided, it will be interpreted as relative to vmtest.toml
  • writable (bool)
    • Optional field
    • Whether this mount is writable in the VM.
    • Default: false

Examples

Mount host tmpfs inside guest with read/write permissions:

[[target]]
name = "test"
kernel = "/home/dlxu/scratch/bzImage-v6.6-default"
command = "ls -l /tmp/hosttmp"
[target.vm.mounts]
"/tmp/hosttmp" = { host_path = "/tmp", writable = true }