astreknet/OpenBSD_on_Apple_M2_QEMU.md

## OpenBSD_on_Apple_M2_QEMU.md

      
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              OpenBSD_on_Apple_M2_QEMU.md
            
          
    OpenBSD on Apple M2 with QEMU

Minimalist installation of OpenBSD on the Apple M2 using QEMU
Ingredients


Apple M2 running macOS Sonoma 14.4.1
QEMU version 8.2.1
OpenBSD 7.5 arm64

Installation


install QEMU with Homebrew brew install qemu, also possible with MacPorts
Write a script with execute permissions chmod +x qemu_aarch64_install_openbsd.sh for installing the image.

Download the OpenBSD installation image
Create an image of the OpenBSD drive
Getting the edk2-aarch64-code
Installing


#!/bin/sh -
  
curl https://ftp.eu.openbsd.org/pub/OpenBSD/7.5/arm64/miniroot75.img -o miniroot75.img 
curl https://ftp.openbsd.org/pub/OpenBSD/7.5/arm64/SHA256 -o SHA256
shasum -c --ignore-missing SHA256

qemu-img create -f qcow2 obsd_aarch64.qcow2 32G

qemu-system-aarch64 \
    -M virt \
    -cpu host \
    -accel hvf \
    -smp 4 \
    -m 4096 \
    -nographic \
    -serial mon:stdio \
    -bios /opt/homebrew/share/qemu/edk2-aarch64-code.fd \
    -drive file=miniroot75.img,format=raw,if=virtio \
    -drive file=obsd_aarch64.qcow2,format=qcow2,if=virtio \
    -netdev user,id=mynet0,hostfwd=tcp::7922-:22 -device virtio-net,netdev=mynet0

rm miniroot75.img SHA256 


Follow the OpenBSD installation program, please notice the remarks at the end of this document:


When the installation is done, pkill qemu-system-aarch64


Running OpenBSD with QEMU

like this:
qemu-system-aarch64 \
    -M virt \
    -cpu host \
    -accel hvf \
    -smp 4 \
    -m 4096 \
    -nographic \
    -bios /opt/homebrew/share/qemu/edk2-aarch64-code.fd \
    -drive file=obsd_aarch64.qcow2,format=qcow2,if=virtio \
    -netdev user,id=mynet0,hostfwd=tcp::7922-:22 -device virtio-net,netdev=mynet0 

Remarks


there is a problem with the DNS if the network interface (vio0) is on autoconf so is better configure it manually, have a look at QEMU's User Networking, for instance IPv4 would work on 10.0.2.15/24 and 10.0.2.2 gateway.


alternatively a full image installXX.img instead of minirootXX.img would work.


for the lazy asses, like me, it is possible to do autoinstall(8) with an install.conf on your localhost like this one:
System hostname = myHost
IPv4 address for vio0 = 10.0.2.15    
Default IPv4 route = 10.0.2.2
DNS nameservers = 1.1.1.1 8.8.8.8
Password for root = RootsPassword
Setup a user = myName
Password for user = myPassword
Public ssh key for user = ssh-ed25519 AAA...318C myName@myHost.local
What timezone are you in = YOUR/TIMEZONE
Which disk is the root disk = sd1
Location of sets = http 
HTTP Server = ftp.eu.openbsd.org
URL to autopartitioning template for disklabel = http://10.0.2.2/openbsd-pgdb.disklabel 

also possible to define the disk partition adding openbsd-pgdb.disklabel on your localhost like this one:
/           0.3G
swap        2M        10%
/altroot    0.3G
/tmp        120M-4G   8%
/var        3G        13%
/usr        0.9G-3G   5%
/usr/local  3G-7.5G   10%
/home       9G-*      45%


Sources


OpenBSD FAQ - Installation Guide
QEMU - documentation)