Why Rosetta 2 Cannot Be Supported on libkrun — Technical and Legal Analysis

[tnk4on]

I investigated whether Rosetta 2 (x86_64 binary translation) could be added to the libkrun backend on macOS and documented my findings:

https://tnk4on.github.io/libkrun-rosetta/

The report covers:

• Why Rosetta is architecturally bound to Virtualization.framework and cannot work with Hypervisor.framework
• Apple's undocumented runtime protection mechanisms
• Legal risks (DMCA, EULA, trademark, trade secrets) that prevent upstream contribution
• Alternative approaches: FEX-Emu, Box64, and QEMU user-mode comparison

Given that Rosetta integration with libkrun is not viable, I hope this analysis provides useful context for the community as Podman's x86_64 emulation strategy evolves.