------- Comment From boris.m...@de.ibm.com 2025-03-25 06:12 EDT------- Solution (provided by <schne...@linux.ibm.com>):
The first part of the problem is solved by not ignoring PFs in standby. The second issue is solved by explicitly checking if the parent PF of a given VF is configured and enabled. Since a PFn can only have child VFs while enabled this is always the case if this configuration has the parent PF. Reproduction: The first part of the issue can be reproduced by putting a PF in standby, then reboot, configure it and try creating child VFs which then appear in their own PCI domains. For the second part two LPARs with both PFs+VFs from a single card sharing candidate lists are required. Then a VF with its parent PF in the other LPAR will incorrectly be placed in the shared PCI domain of its "uncle PF". Upstream-ID: dc287e4c9149ab54a5003b4d4da007818b5fda3d 05793884a1f30509e477de9da233ab73584b1c8c 2844ddbd540fc84d7571cca65d6c43088e4d6952 Preventive: yes -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2104120 Title: [Ubuntu 25.04] s390/pci: Fix PCHID per port multi-function detection Status in Ubuntu on IBM z Systems: Incomplete Status in linux package in Ubuntu: Incomplete Bug description: 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/2104120/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
