[quinncom]

“OrbStack uses a lightweight Linux virtual machine with a shared kernel to minimize overhead and save resources, similar to WSL 2 (Windows Subsystem for Linux). This flexible architecture comes with many advantages such as high efficiency, low resource usage, seamless integration with macOS, and more.”

https://docs.orbstack.dev/architecture

[drzaiusx11]

Seems they're maintaining an unpublished fork of the Linux kernel "linux-macvirt" to achieve this. Apparently you have to contact them directly for a copy of the code[1]

https://github.com/orbstack/linux-macvirt