[kamilner]

I'm not sure how OrbStack does it, but it can run a fully x64 Linux using Rosetta with quite good performance.

[AkshitGarg]

IIRC that runs a x86_64 userland (using Rosetta) on a arm64 kernel.

[kamilner]

Interesting. uname -a reports x86_64, and lscpu also reports x86_64, although perhaps that's just the kernel being patched to lie about the architecture.

[saagarjha]

Not the kernel, but yes: the runtime lies about its architecture.