jailhouse VS botnana-api-rs

You could run it inside something like jailhouse hypervisor (https://github.com/siemens/jailhouse) if you want to give it direct dedicated "baremetal" access to hardware. You could do this inside of a buildroot linux image. This would need a customized simulator.

Yes indeed, and Siemens even has their own hypervisor: https://github.com/siemens/jailhouse

Yeah, I think that is what something like https://www.toradex.com/computer-on-modules/apalis-arm-family/nxp-imx-8 is useful for, where it has a separate core. Or even on linux you can use isolcpus to get pseudo-isolation. There are also hardware hypervisors like Jailhouse (https://github.com/siemens/jailhouse) which can completely isolate hardware resources and I suppose might prevent the GPU from causing an issue with realtime task. But this definitely affects ease-of-use and probably requires a reduced feature set in the language (no dynamic allocations) and lots of unsafe code.

I provide systems with xenomai and etherlab installed and integrated with my motion system to local machine builders in Taiwan. This motion system is in Rust and run in real-time. But because most machine builders do not use Rust, also do not want to know real-time system either, I do not reveal the Rust API of this real-time system, instead I provide a client library for them. This client library is also written in Rust, but works as a C library. You can find it here and here 。In order to provide more flexibility, I also embedded a Forth language interpreter in the real-time system, so that I can build something like CNC. This interpreter is also developed in Rust.