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README.md

Python in VMOD TinyKVM

Python is well supported in TinyKVM.

Build settings

Python can be built statically using the magnificent python-cmake-buildsystem. Build it somewhere on your machine, and point to it from this folders build.sh.

Run-time settings

Once you have the static Python executable, you will need a customized compute.json incantation. Here is an example from my machine:

{
	"filename": "/home/gonzo/github/kvm_demo/python/python_tinykvm",
	"main_arguments": [
		"/home/gonzo/github/kvm_demo/python/program.py"
	],
	"allowed_paths": [
		"$/home/gonzo/github/python-cmake-buildsystem/.build/lib/python3.13",
		"/home/gonzo/github/kvm_demo/python/program.py",
		"/"
	],
	"environment": [
		"PYTHONHOME=/home/gonzo/github/kvm_demo/python",
		"PYTHONPATH=/home/gonzo/github/python-cmake-buildsystem/.build/lib/python3.13"
	]
}

We're passing the program as part of main arguments, and allowing access to Python modules in allowed_paths. We also have to tell Python about where to find the modules, which path can be set in the PYTHONPATH environment variable.

Why Python needs access to / is still a mystery, but probably not something that is dangerous to do. It is read-only access, and is not used as prefix for other accesses.