TFA does mention the word "clipboard", but the containing sentence, while perhaps technically correct, seems a bit misleading, as follows: "As implemented in macOS (both as guest and host), there are also extensions to support keyboard and pointing devices, a shared clipboard, and high-performance graphics with Metal and GPU support." As I understand it, even if those extensions "exist", what good are they if they are not adopted?:

- If you virtualize macOS within macOS on Apple Silicon using UTM, you cannot copy paste between systems reliably (bidirectional shared clipboard is very, very fragile; "can" work a little but is essentially fully broken/unreliable).

- If you virtualize macOS within macOS on Apple Silicon using Parallels (often considered a best-choice solution), you cannot copy paste between systems at all (bidirectional shared clipboard is an explicit non-feature at this time).

Thus, if you want bidirectional clipboard, on a macOS host, you'll have to run a *nix (seems to work) or maybe Win (I haven't tried) guest OS.

I would have tried VMWare Fusion (free for personal use), but after jumping through all the signup and download navigation hoops, I couldn't even get the download link to un-gray itself out for me. Is bidirectional macOS to macOS clipboard implemented there? IDK and I cannot tell.

Also FYI:

- launch times are fast enough for serverless

- you can restore snapshots for macOS guests but not for Linux

- Apple's open-source container support is built on Virtualization, making it a much more secure option than Docker

What's needs investigating is access to the secure enclave. You can login with an apple ID and use enclave API's; it's not clear if this is emulated or handled using the host enclave with a different scope - i.e., if this presents any security issues. To be conservative, one might avoid logging in using an Apple ID with sensitive information in an automated/CI context.

0. https://mac.getutm.app