Osx Kvm

Note

This README.md documents the process of creating a Virtual Hackintosh system.

Note: All blobs and resources included in this repository are re-derivable (all instructions are included!).

💚 Looking for commercial support with this stuff? I am available over email for a chat for commercial support options only. Note: Project sponsors get access to the Private OSX-KVM repository, and direct support.

Working with Proxmox and macOS? See Nick's blog for sure.

Yes, we support offline macOS installations now

Contributing Back

This project can always use your help, time and attention. I am looking for help (pull-requests!) with the following work items:

• Documentation around running macOS on popular cloud providers (Hetzner, GCP, AWS). See the Is This Legal? section and associated references.

• Document (share) how you use this project to build + test open-source projects / get your stuff done.

• Document how to use this project for XNU kernel debugging and development.

• Document the process to launch a bunch of headless macOS VMs (build farm).

• Document usage of munki to deploy software to such a build farm.

• Enable VNC + SSH support out of the box or more easily.

• Robustness improvements are always welcome!

• (Not so) crazy idea - automate the macOS installation via OpenCV.

Requirements

• A modern Linux distribution. E.g. Ubuntu 22.04 LTS 64-bit or later.

• QEMU >= 6.2.0

• A CPU with Intel VT-x / AMD SVM support is required (grep -e vmx -e svm /proc/cpuinfo)

• A CPU with SSE4.1 support is required for >= macOS Sierra

• A CPU with AVX2 support is required for >= macOS Mojave

Note: Older AMD CPU(s) are known to be problematic. AMD FX-8350 works but Phenom II X3 720 does not. Ryzen processors work just fine.

Installation Preparation

• KVM may need the following tweak on the host machine to work.

  echo 1 | sudo tee /sys/module/kvm/parameters/ignore_msrs
  

  To make this change permanent, you may use the following command.

  sudo cp kvm.conf /etc/modprobe.d/kvm.conf  # for intel boxes only, after cloning the repo below
  

• Install QEMU and other packages.

  sudo apt-get install qemu uml-utilities virt-manager git \
      wget libguestfs-tools p7zip-full make dmg2img -y
  

  This step may need to be adapted for your Linux distribution.

• Add user to the kvm and libvirt groups (might be needed).

  sudo usermod -aG kvm $(whoami)
  sudo usermod -aG libvirt $(whoami)
  sudo usermod -aG input $(whoami)
  

  Note: Re-login after executing this command.

• Clone this repository on your QEMU system. Files from this repository are used in the following steps.

  cd ~
  
  git clone --depth 1 --recursive https://github.com/kholia/OSX-KVM.git
  
  cd OSX-KVM
  

  Repository updates can be pulled via the following command:

  git pull --rebase
  

  This repository uses rebase based workflows heavily.

• Fetch macOS installer.

  ./fetch-macOS-v2.py
  

  You can choose your desired macOS version here. After executing this step, you should have the BaseSystem.dmg file in the current folder.

  ATTENTION: Let >= Big Sur setup sit at the Country Selection screen, and other similar places for a while if things are being slow. The initial macOS setup wizard will eventually succeed.

  Sample run:

  $ ./fetch-macOS-v2.py
  1. High Sierra (10.13)
  2. Mojave (10.14)
  3. Catalina (10.15)
  4. Big Sur (11.7) - RECOMMENDED
  5. Monterey (12.6)
  6. Ventura (13)
  
  Choose a product to download (1-6): 4
  

  Note: Modern NVIDIA GPUs are supported on HighSierra but not on later versions of macOS.

• Convert the downloaded BaseSystem.dmg file into the BaseSystem.img file.

  dmg2img -i BaseSystem.dmg BaseSystem.img
  

• Create a virtual HDD image where macOS will be installed. If you change the name of the disk image from mac_hdd_ng.img to something else, the boot scripts will need to be updated to point to the new image name.

  qemu-img create -f qcow2 mac_hdd_ng.img 128G
  

  NOTE: Create this HDD image file on a fast SSD/NVMe disk for best results.

• Now you are ready to install macOS

Installation

• CLI method (primary). Just run the OpenCore-Boot.sh script to start the installation process.

  ./OpenCore-Boot.sh
  

  Note: This same script works for Big Sur, Catalina, Mojave, and High Sierra.

• Use the Disk Utility tool within the macOS installer to partition, and format the virtual disk attached to the macOS VM.

• Go ahead, and install macOS

• TIP: Using a non-APFS filesystem is recommended.

• (OPTIONAL) Use this macOS VM disk with libvirt (virt-manager / virsh stuff).

  • Edit macOS-libvirt-Catalina.xml file and change the various file paths (search for CHANGEME strings in that file). The following command should do the trick usually.

    sed "s/CHANGEME/$USER/g" macOS-libvirt-Catalina.xml > macOS.xml
    
    virt-xml-validate macOS.xml
    

  • Create a VM by running the following command.

    virsh --connect qemu:///system define macOS.xml
    

  • If needed, grant necessary permissions to libvirt-qemu user,

    sudo setfacl -m u:libvirt-qemu:rx /home/$USER
    sudo setfacl -R -m u:libvirt-qemu:rx /home/$USER/OSX-KVM
    

  • Launch virt-manager and start the macOS virtual machine.

Setting Expectations Right

Nice job on setting up a Virtual Hackintosh system! Such a system can be used for a variety of purposes (e.g. software builds, testing, reversing work), and it may be all you need, along with some tweaks documented in this repository.

However, such a system lacks graphical acceleration, a reliable sound sub-system, USB 3 functionality and other similar things. To enable these things, take a look at our notes. We would like to resume our testing and documentation work around this area. Please reach out to us if you are able to fund this area of work.

It is possible to have 'beyond-native-apple-hw' performance but it does require work, patience, and a bit of luck (perhaps?).

Post-Installation

• See networking notes to setup guest networking.

  I have the following commands present in /etc/rc.local.

  #!/usr/bin/env bash
  
  sudo ip tuntap add dev tap0 mode tap
  sudo ip link set tap0 up promisc on
  sudo ip link set dev virbr0 up
  sudo ip link set dev tap0 master virbr0
  

  This has been enough for me so far.

  Note: You may need to enable the rc.local functionality manually on modern Ubuntu versions. Check out the notes included in this repository for details.

• To passthrough GPUs and other devices, see these notes.

• Need a different resolution? Check out the notes included in this repository.

• Trouble with iMessage? Check out the notes included in this repository.

• Highly recommended macOS tweaks - sickcodes/osx-optimizer

Is This Legal?

The "secret" Apple OSK string is widely available on the Internet. It is also included in a public court document available here. I am not a lawyer but it seems that Apple's attempt(s) to get the OSK string treated as a trade secret did not work out. Due to these reasons, the OSK string is freely included in this repository.

Please review the 'Legality of Hackintoshing' documentation bits from Dortania's OpenCore Install Guide.

Gabriel Somlo also has some thoughts on the legal aspects involved in running macOS under QEMU/KVM.

You may also find this 'Announcing Amazon EC2 Mac instances for macOS' article interesting.

Note: It is your responsibility to understand, and accept (or not accept) the Apple EULA.

Note: This is not legal advice, so please make the proper assessments yourself and discuss with your lawyers if you have any concerns (Text credit: Dortania)

Motivation

My aim is to enable macOS based educational tasks, builds + testing, kernel debugging, reversing, and macOS security research in an easy, reproducible manner without getting 'invested' in Apple's closed ecosystem (too heavily).

These Virtual Hackintosh systems are not intended to replace the genuine physical macOS systems.

Personally speaking, this repository has been a way for me to 'exit' the Apple ecosystem. It has helped me to test and compare the interoperability of Canon CanoScan LiDE 120 scanner, and Brother HL-2250DN laser printer. And these devices now work decently enough on modern versions of Ubuntu (Yay for free software). Also, a long time back, I had to completely wipe my (then) brand new MacBook Pro (Retina, 15-inch, Late 2013) and install Xubuntu on it - as the OS X kernel kept crashing on it!

Backstory: I was a (poor) student in Canada in a previous life and Apple made my work on cracking Apple Keychains a lot harder than it needed to be. This is how I got interested in Hackintosh systems.