The Boot tab provides an option to name the guest OS (what is seen in UTM) and change the IPSW (best to just start a new guest OS though). Again, wouldn’t recommend below 4096 memory for most uses. The System options is where cores can be edited and memory added. The first option is the Information screen, which just includes some information (I like to put the date I created a VM and a version number (or other naming scheme) in the Notes box. Once the VM has been created, select it in the left sidebar to see more settings available and click the icon in the upper right corner to change any settings. Make sure the IPSW is the one to create the specific OS desired. Review the information in the Summary screen and click Save to start creating the new virtual machine. 64 GB is a fine amount to start with, but go below 32 and there may be some issues. This pulls the capacity from the available hard drive space for a machine. The next screen decides how much space the virtual machine will occupy. The defaults for Memory and how many CPU Cores should be fine for an initial experiment (and these can be changed later). Once the IPSW is selected, choose the virtual hardware to allocate to the virtual machine. Either click Continue for the same OS or click Browse and select the IPSW obtained from the Apple Developer portal. The next screen gives the option to either install the OS the host operating system is running or a different version of macOS via an IPSW. For a Mac running macOS 12, 13, etc, this will be the first option so click there. The list of operating systems will reflect those that can be run as virtual machines with the current architecture. Given that we’ll be installing a beta OS from Apple for this example, we’ll click Virtualize.
Here, there are options to Virtualize or Emulate. Once installed, open the UTM app and click on the plus sign to create a new virtual machine. It can run guest operating systems in Windows, Linux, etc – emulating RISC, ARM, Intel, etc. It also emulates via the QEMU system emulation.
UTM uses the new virtualization framework ( documented here) from Apple, so runs the most modern virtualization stack currently available on a Mac. UTM is a virtualization tool available on the Mac App Store at with a GitHub at.
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