Cloud Hypervisor uses the main Cargo.toml both as crate and as workspace. This has some downsides:

• one must specify --workspace (e.g., cargo test --workspace) all the time for workspace-wide actions
  • especially since cargo clippy and cargo test now work completely it would be cool if things "just work" a little more nicely (Quality of Life Improvement: cargo clippy just works #7482 and Quality of Life Improvement: enable cargo test --workspace: via #[cfg(chv_testenv)] #7487)
• the Cargo.toml file is very bloated

I think I started this discussion two years ago (#5761) but back then @rbradford replied with

Big 👎 for reorganising the source tree - it makes backporting and bug fixes and code archaeology much harder.

in my perception, in retrospective, we would not have an issue with that. Please correct me if I'm wrong! Especially as the code in <repo>/src is very small and most functionality is already in <repo>/vmm. So in my opinion, it would improve the developer experience to decouple things without making any noticeable downsides.