I could next build a test kernel with some debug around the vfio iommu dma map 
to check how time below that call is spent.
I'm sure that data already is hidden in some of my trace data, but to 
eventually change/experiment I need to build one anyway.

I expect anyway to summarize and go into a discussion at some point, as
even if one would split the map calls iommus are full of quirks and
constraints that might bit us later.

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https://bugs.launchpad.net/bugs/1838575

Title:
  passthrough devices cause >17min boot delay

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