Require nvidia-persistenced for nvidia-cdi-refresh

[elezar]

No description provided.

[steven-bellock]

Suggested change

	# We difine nvidia-perisistenced.service as an (After) Requisite to ensure that this
	# serivce only starts if that is already started.
	# Specify nvidia-perisistenced.service as a dependency to ensure that this service
	# only starts if that has started. This is required for Confidential Compute.

[steven-bellock]

@yf23 this solution requires nvidia-persistenced to be started by systemd as outlined in the deployment guide https://docs.nvidia.com/cc-deployment-guide-tdx.pdf. Does this seem reasonable?

[elezar]

@yf23 this solution requires nvidia-persistenced to be started by systemd as outlined in the deployment guide https://docs.nvidia.com/cc-deployment-guide-tdx.pdf. Does this seem reasonable?

It is often recommended on our end, but I don't know whether we can call this a requirement. Is there a way to ONLY add this requirement IF it is actuall present?

[ArangoGutierrez]

@elezar Thanks for this PR, Could you provide a PR description detailing the motivation behind this change? is the goal to address a specific user need, eg CoCO/CC, or a more broad motivation behind making the cdi-refresh service more stable?