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.. SPDX-License-Identifier: GPL-2.0-or-later
VMApple machine emulation
========================================================================================
VMApple is the device model that the macOS built-in hypervisor called "Virtualization.framework"
exposes to Apple Silicon macOS guests. The "vmapple" machine model in QEMU implements the same
device model, but does not use any code from Virtualization.Framework.
Prerequisites
-------------
To run the vmapple machine model, you need to
* Run on Apple Silicon
* Run on macOS 12.0 or above
* Have an already installed copy of a Virtualization.Framework macOS 12 virtual
machine. Note that newer versions than 12.x are currently NOT supported on
the guest side. I will assume that you installed it using the
`macosvm <https://github.com/s-u/macosvm>`__ CLI.
First, we need to extract the UUID from the virtual machine that you installed. You can do this
by running the shell script in contrib/vmapple/uuid.sh on the macosvm.json file.
.. code-block:: bash
:caption: uuid.sh script to extract the UUID from a macosvm.json file
$ contrib/vmapple/uuid.sh "path/to/macosvm.json"
Now we also need to trim the aux partition. It contains metadata that we can just discard:
.. code-block:: bash
:caption: Command to trim the aux file
$ dd if="aux.img" of="aux.img.trimmed" bs=$(( 0x4000 )) skip=1
How to run
----------
Then, we can launch QEMU with the Virtualization.Framework pre-boot environment and the readily
installed target disk images. I recommend to port forward the VM's ssh and vnc ports to the host
to get better interactive access into the target system:
.. code-block:: bash
:caption: Example execution command line
$ UUID="$(contrib/vmapple/uuid.sh 'macosvm.json')"
$ AVPBOOTER="/System/Library/Frameworks/Virtualization.framework/Resources/AVPBooter.vmapple2.bin"
$ AUX="aux.img.trimmed"
$ DISK="disk.img"
$ qemu-system-aarch64 \
-serial mon:stdio \
-m 4G \
-accel hvf \
-M vmapple,uuid="$UUID" \
-bios "$AVPBOOTER" \
-drive file="$AUX",if=pflash,format=raw \
-drive file="$DISK",if=pflash,format=raw \
-drive file="$AUX",if=none,id=aux,format=raw \
-drive file="$DISK",if=none,id=root,format=raw \
-device vmapple-virtio-blk-pci,variant=aux,drive=aux \
-device vmapple-virtio-blk-pci,variant=root,drive=root \
-netdev user,id=net0,ipv6=off,hostfwd=tcp::2222-:22,hostfwd=tcp::5901-:5900 \
-device virtio-net-pci,netdev=net0
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