** Changed in: linux (Ubuntu)
Status: New => In Progress
** Changed in: ubuntu-z-systems
Status: Triaged => In Progress
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https://bugs.launchpad.net/bugs/1874057
Title:
[UBUNTU 20.04] s390x/pci: do not allow to create more pci functions
than configured via CONFIG_PCI_NR_FUNCTIONS
Status in Ubuntu on IBM z Systems:
In Progress
Status in linux package in Ubuntu:
In Progress
Bug description:
SRU Justification:
==================
[Impact]
* PCI Functions with UIDs >128 are currently not accounted correctly
in the s390x/pci (zPCI) code.
* Furthermore, the code allows that more than CONFIG_PCI_NR_FUNCTIONS
are created.
* This can lead to issues with data structures which were only
allocated for CONFIG_PCI_NR_FUNCTIONS.
[Fix]
*
https://bugs.launchpad.net/ubuntu-z-systems/+bug/1874057/+attachment/5357850/+files/0001-s390
-pci-Fix-zpci_alloc_domain-over-allocation-for-focal.patch
[Test Case]
* Set the kernel parameter CONFIG_PCI_NR_FUNCTIONS to a specific
(reasonablly low) number.
* And check if more PCI functions can be created than specified by
CONFIG_PCI_NR_FUNCTIONS (e.g. using a RoCE adapter) and watch for
kernel message 'Adding PCI function ... failed'
[Regression Potential]
* There is regression potential can be considered as low, since:
* the zPCI cards are less wide spread than for example ccw adapters on
s390x
* the fix got already upstream accepted in 5.7, hence upstream
reviewed, too
* the modifications span just two files and both are s390x arch
specific
[Other Info]
* the above patch-file is based on commit
969ae01bab2fe938b4c8324836038b5ac1c78fac ("s390/pci: Fix
zpci_alloc_domain() over allocation"), but this backport was needed
for getting this applied to focal master-next
* and this patch got upstream accepted with kernel v5.7-rc1, hence on
the long term it should be in 'gorilla'
__________
PCI Functions with UIDs >128 are currently not accounted correctly in
the s390x/pci code. Furthermore, the code allows that more than
CONFIG_PCI_NR_FUNCTIONS are created. This can lead to issues with data
structures which were only allocated for CONFIG_PCI_NR_FUNCTIONS.
This has been fixed in the following upstream commit:
969ae01bab2fe938b4c8324836038b5ac1c78fac
("s390/pci: Fix zpci_alloc_domain() over allocation")
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