Why are pci-devices passed as node and not by the parent

Basur

2/12/24, 9:08 PM

I was wondering why in every pci / gpu passthrought tutorial devices are passed by each node. Consider the following

  +- pci_0000_40_03_1
  |   |
  |   +- pci_0000_41_00_0
  |       |
  |       +- pci_0000_42_00_0
  |           |
  |           +- pci_0000_43_00_0
  |           +- pci_0000_43_00_1
  |

If we say pci_0000_43_00_0 and pci_0000_43_00_1 are part of and GPU and _0 is the "gpu" part and _1 is the HDMI/DP Audio Controller.

Why is it not common to pass the whole device via the parent _42_00_0? Are there performance degrations or other limitations, preventing this?

My research did not throwing sufficient results as im unshure where to look for the correct answer.

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EN: Why are pci-devices passed as node and not by the parent

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