The fix commits have been applied to Oracular kernel tree:
-
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/oracular/commit/?h=master-next&id=42f5ac7eb02b94c21ec2d2ba7014f958207b46b1
-
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/oracular/commit/?h=master-next&id=a34538f8cd910b539063cbb0d35d5a5d4f3be3c8
-
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/oracular/commit/?h=master-next&id=14ad3c790c8530c5b0a05e20e45cb1f93f59d345
Changing the status accordingly.
** Changed in: linux (Ubuntu Oracular)
Status: In Progress => Fix Committed
** Changed in: ubuntu-z-systems
Status: In Progress => Fix Committed
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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:
Fix Committed
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Noble:
Fix Committed
Status in linux source package in Oracular:
Fix Committed
Status in linux source package in Plucky:
Fix Released
Bug description:
[Impact]
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.
[Fix]
Cherry pick from mainline of:
- dc287e4c9149 s390/pci: Fix SR-IOV for PFs initially in standby
- 05793884a1f3 s390/pci: Pull search for parent PF out of
pci_iov_setup_virtfn()
- 2844ddbd540f s390/pci: Fix handling of isolated VFs
[Test Plan]
Fix tested by IBM.
[Where problems could occur]
The fix affects SR-IOV support in the s390x PCI subsystem.
A user might experience issues like missing or misconfigured VFs, failed VF
passthrough to guests, sysfs inconsistencies, or degraded I/O performance.
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