Running GUI Linux in a virtual machine on a Mac

Install and run GUI Linux in a virtual machine using the Virtualization framework.

Overview

This sample code project demonstrates how to install and run GUI Linux virtual machines (VMs) on a Mac.

The Xcode project includes a single target, GUILinuxVirtualMachineSampleApp, which is a macOS app that installs a Linux distribution from an ISO image into a VM, and subsequently runs the installed Linux VM.

Download a Linux installation image

Before you run the sample program, you need to download an ISO installation image from a Linux distribution website. Some common Linux distributions include:

Configure the sample code project

Launch Xcode and open GUILinuxVirtualMachineSampleApp.xcodeproj.
Navigate to the Signing & Capabilities panel and select your team ID.
Build and run GUILinuxVirtualMachineSampleApp. The sample app starts the VM and configures a graphical view that you interact with. The Linux VM continues running until you shut it down from the guest OS, or when you quit the app.
When you run the app for the first time, it displays a file picker so you can choose the Linux installation ISO image to use for installing your Linux VM. Navigate to the ISO image that you downloaded, select the file, and click Open. The VM boots into the OS installer, and the installer’s user interface appears in the app’s window. Follow the installation instructions. When the installation finishes, the Linux VM is ready to use.
As part of the installation process, the Virtualization framework creates a GUI Linux VM.bundle package in your home directory. The sample app only supports running one VM at a time, however, the Virtualization framework supports running multiple VMs simultaneously. Running multiple VMs requires an app to manage the execution and artifacts of each individual VM.
The contents of the bundle represent the state of the Linux guest, and contain the following:
- Disk.img — The main disk image of the installed Linux OS.
- MachineIdentifier — The data representation of the VZGenericMachineIdentifier object.
- NVRAM — The EFI variable store.
Subsequent launches of GUILinuxVirtualMachineSampleApp run the installed Linux VM. To reinstall the VM, delete the GUI Linux VM.bundle package and run the app again.

Install GUI Linux from an ISO image

The sample app configures a VZDiskImageStorageDeviceAttachment object with the downloaded ISO image attached, and creates a VZUSBMassStorageDeviceConfiguration with it to emulate a USB thumb drive that’s plugged in to the VM.

private func createUSBMassStorageDeviceConfiguration() -> VZUSBMassStorageDeviceConfiguration {
    guard let intallerDiskAttachment = try? VZDiskImageStorageDeviceAttachment(url: installerISOPath!, readOnly: true) else {
        fatalError("Failed to create installer's disk attachment.")
    }

    return VZUSBMassStorageDeviceConfiguration(attachment: intallerDiskAttachment)
}

Set up the VM

The sample app uses a VZVirtualMachineConfiguration object to configure the basic characteristics of the VM, such as the CPU count, memory size, various device configurations, and a VZEFIBootLoader to load the Linux operating system into the VM.

let virtualMachineConfiguration = VZVirtualMachineConfiguration()

virtualMachineConfiguration.cpuCount = computeCPUCount()
virtualMachineConfiguration.memorySize = computeMemorySize()

let platform = VZGenericPlatformConfiguration()
let bootloader = VZEFIBootLoader()
let disksArray = NSMutableArray()

if needsInstall {
    // This is a fresh install: Create a new machine identifier and EFI variable store,
    // and configure a USB mass storage device to boot the ISO image.
    platform.machineIdentifier = createAndSaveMachineIdentifier()
    bootloader.variableStore = createEFIVariableStore()
    disksArray.add(createUSBMassStorageDeviceConfiguration())
} else {
    // The VM is booting from a disk image that already has the OS installed.
    // Retrieve the machine identifier and EFI variable store that were saved to
    // disk during installation.
    platform.machineIdentifier = retrieveMachineIdentifier()
    bootloader.variableStore = retrieveEFIVariableStore()
}

virtualMachineConfiguration.platform = platform
virtualMachineConfiguration.bootLoader = bootloader

disksArray.add(createBlockDeviceConfiguration())
guard let disks = disksArray as? [VZStorageDeviceConfiguration] else {
    fatalError("Invalid disksArray.")
}
virtualMachineConfiguration.storageDevices = disks

virtualMachineConfiguration.networkDevices = [createNetworkDeviceConfiguration()]
virtualMachineConfiguration.graphicsDevices = [createGraphicsDeviceConfiguration()]
virtualMachineConfiguration.audioDevices = [createInputAudioDeviceConfiguration(), createOutputAudioDeviceConfiguration()]

virtualMachineConfiguration.keyboards = [VZUSBKeyboardConfiguration()]
virtualMachineConfiguration.pointingDevices = [VZUSBScreenCoordinatePointingDeviceConfiguration()]
virtualMachineConfiguration.consoleDevices = [createSpiceAgentConsoleDeviceConfiguration()]

try! virtualMachineConfiguration.validate()
virtualMachine = VZVirtualMachine(configuration: virtualMachineConfiguration)

Enable copy-and-paste support between the host and the guest

In macOS 13 and later, the Virtualization framework supports copy-and-paste of text and images between the Mac host and Linux guests through the SPICE agent clipboard-sharing capability. The example below shows the steps for configuring VZVirtioConsoleDeviceConfiguration and VZSpiceAgentPortAttachment to enable this capability:

private func createSpiceAgentConsoleDeviceConfiguration() -> VZVirtioConsoleDeviceConfiguration {
    let consoleDevice = VZVirtioConsoleDeviceConfiguration()

    let spiceAgentPort = VZVirtioConsolePortConfiguration()
    spiceAgentPort.name = VZSpiceAgentPortAttachment.spiceAgentPortName
    spiceAgentPort.attachment = VZSpiceAgentPortAttachment()
    consoleDevice.ports[0] = spiceAgentPort

    return consoleDevice
}

Start the VM

After building the configuration data for the VM, the sample app uses the VZVirtualMachine object to start the execution of the Linux guest operating system.

Before calling the VM’s start(completionHandler:) method, the sample app configures a delegate object to receive messages about the state of the virtual machine. When the Linux operating system shuts down, the VM calls the delegate’s guestDidStop(_:) method. In response, the delegate method prints a message and exits the sample.

self.virtualMachineView.virtualMachine = self.virtualMachine

if #available(macOS 14.0, *) {
    // Configure the app to automatically respond changes in the display size.
    self.virtualMachineView.automaticallyReconfiguresDisplay = true
}

self.virtualMachine.delegate = self
self.virtualMachine.start(completionHandler: { (result) in
    switch result {
    case let .failure(error):
        fatalError("Virtual machine failed to start with error: \(error)")

    default:
        print("Virtual machine successfully started.")
    }
})

The app sets the display to automatically resize when the window size changes.