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---Problem Description---
Regression: uvdevice at /dev/uv not compiled into kernel
Machine Type = IBM z15, IBM z16
Contact Information = steffen.ei...@ibm.com
---uname output---
Linux 6.5.0-14-generic #14-Ubuntu SMP Tue Nov 14 14:16:58 UTC 2023 s390x s390x
s390x GNU/Linux
---Debugger---
A debugger is not configured
---Additional Hardware Info---
Secure Execution feature code enabled (optional)
---Steps to Reproduce---
# working/ old behavior
on a fresh ubuntu 22.10 (and 22.04) LPAR/guest1 (with Secure execution
available)
> cat /dev/uv
/dev/uv
> cat /boot/config-$(uname -r) | grep UV_UAPI
CONFIG_S390_UV_UAPI=y
that's the expected state for Ubuntu.
# current/ non expected behavior
since Ubuntu 23.04 the following happens:
stock kernel non-modified, latest available
> cat /dev/uv
cat: /dev/uv: No such file or directory
COMMENT:
this still can happen if the machine has no Secure Execution feature available
However, the following should not be the case under any circumstances:
> cat /boot/config-$(uname -r) | grep UV_UAPI
# CONFIG_S390_UV_UAPI is not set
Somehow that configuration got lost between 22.X and 23.X.
Maybe, because IIRC that features got back-ported to 22.X
# Proposed Solution:
change the kernel config to
CONFIG_S390_UV_UAPI=y (same as 22.X backport)
or
CONFIG_S390_UV_UAPI=m (same as upstream)
and provide a new kernel binary
Stack trace output:
n/a
System Dump Info:
The system is not configured to capture a system dump.
Oops output:
n/a
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: New
** Tags: architecture-s39064 bugnameltc-204559 severity-medium
targetmilestone-inin---
--
[UBUNTU 23.04] Regression: Ubuntu 23.04/23.10 do not include uvdevice anymore
https://bugs.launchpad.net/bugs/2048919
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