*** This bug is a duplicate of bug 1866056 ***
https://bugs.launchpad.net/bugs/1866056
** Information type changed from Private to Public
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https://bugs.launchpad.net/bugs/1908414
Title:
[21.04 FEAT] s390/Kconfig: default PCI_NR_FUNCTIONS to 512
Status in Ubuntu on IBM z Systems:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Bug description:
Summary: s390/Kconfig: default PCI_NR_FUNCTIONS to 512
Description: On machines with a large number of PCI devices, including
Virtual Functions and NVMe devices it is quite common that an
LPAR can see over 100 PCI functions in Standby or even wants
to use as many.
For affected distributions this poses a problem as any PCI
function probed after the limit has been reached is simply
inaccessible and invisible for older kernels this is even silent.
This is solved by increasing the PCI_NR_FUNCTIONS Kconfig option
to 512 matching the recommended setting in the upstream
defconfig.
In testing and through code study it was determined that this has
only neglibile memory use overhead of a handful of 4k pages when
devices are only visible in Standby.
Upstream-ID: 10e59217479d733ff50b6e8c6316ecffe8b857cb
kernel 5.11
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