Public bug reported:

Description:   s390/pci: Fix PCHID per port multi-function detection

Symptom:       There are two cases in which PCI functions are incorrectly
               placed, or not placed, in a shared PCI topology. In the first
               case a PCI physical function (PF) which is initially in standby
               was incorrectly not creating a new PCI topology when hotplugged,
               but would if configured during boot. In the second case a PCI
               virtual function (VF) would be placed in the shared PCI topology
               of a PF if that PF is from the same card even if the parent PF
               is not in the configuration which should lead the VF to be
               isolated in its own single function topology.

Problem:       Both problems are caused by logic bugs in the determination of
               which PCI functions create topologies and when a PCI function
               may be added to an existing topology.

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Skipper Bug Screeners (skipper-screen-team)
         Status: New


** Tags: architecture-s39064 bugnameltc-211738 severity-high 
targetmilestone-inin---

** Tags added: architecture-s39064 bugnameltc-211738 severity-high
targetmilestone-inin---

** Changed in: ubuntu
     Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)

** Package changed: ubuntu => linux (Ubuntu)

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https://bugs.launchpad.net/bugs/2104120

Title:
  [Ubuntu 25.04] s390/pci: Fix PCHID per port multi-function detection

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