OSX-KVM: A Shell repository from gitrc

Note

This README documents the new method to install macOS. The older README is available here.

This new method does not require an existing physical/virtual macOS installation. However, this new method requires internet access during the macOS installation process. This limitation may be addressed in a future commit.

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

Note: Checkout ideas.md. This project can always use your help, time and attention.

Requirements

A modern Linux distribution. E.g. Ubuntu 18.04 LTS 64-bit.
QEMU > 2.11.1
A CPU with Intel VT-x / AMD SVM support is required
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 > /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
```
Install QEMU and other packages.
```
sudo apt-get install qemu uml-utilities virt-manager dmg2img git wget
```
This step may need to be adapted for your Linux distribution.
Clone this repository again on your QEMU system. Files from this repository are used in the following steps.
```
cd ~

git clone https://github.com/kholia/OSX-KVM.git

cd OSX-KVM
```
Fetch macOS installer.
```
./fetch-macOS.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: Modern NVIDIA GPUs are supported on HighSierra but not on Mojave (yet).

Next, convert this file into a usable format.
```
dmg2img 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.img to something else, the boot scripts will need updating to point to the new image name.
```
qemu-img create -f qcow2 mac_hdd_ng.img 128G
```

Setup quick networking by running the following commands.

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

Note: If virbr0 network interface is not present on your system, it may have been deactivated. Try enabling it by using the following commands,

virsh net-start default

virsh net-autostart default

Now you are ready to install macOS 🚀

Installation

CLI method (primary). Just run the boot-macOS-NG.sh script to start the installation proces.
```
./boot-macOS-NG.sh
```
If you are new to installing macOS, see the older README for help.
GUI method (alternate - functional but needs further debugging work).
- Edit macOS-libvirt-NG.xml file and change the various file paths (search for CHANGEME strings in that file). The following command should do the trick usually.
```
sed -i "s/CHANGEME/$USER/g" macOS-libvirt-NG.xml
```
- Create a VM by running the following command.
```
virsh --connect qemu:///system define macOS-libvirt-NG.xml
```
- Launch virt-manager, start the macOS virtual machine and install macOS as usual.
  
  Note: You may need to run sudo ip link delete tap0 command before virt-manager is able to start the macOS VM.
  
  Note: You may need to remove the following block from macOS-libvirt-NG.xml and run virsh --connect ... again.
```
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='writeback'/>
  <source file='/home/CHANGEME/OSX-KVM/BaseSystem.img'/>
  <target dev='sdc' bus='sata'/>
  <boot order='3'/>
  <address type='drive' controller='0' bus='0' target='0' unit='2'/>
</disk>
```

Post-Installation

See networking notes to setup guest networking.

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

#!/bin/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.

To get sound on your virtual Mac, see the "Virtual Sound Device" in notes.
To passthrough GPUs and other devices, see these notes.
Need a different resolution? Check various notes included in this repository.

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.

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

Motivation

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

Backstory: I was a (poor) student in Canada once and Apple made my work on cracking Apple Keychains a lot harder than it needed to be.

gitrc/OSX-KVM