** Also affects: linux (Ubuntu Mantic)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Lunar)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Noble)
Importance: Undecided
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: New
** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-z-systems
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)
** Changed in: linux (Ubuntu Noble)
Assignee: Skipper Bug Screeners (skipper-screen-team) => (unassigned)
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https://bugs.launchpad.net/bugs/2042853
Title:
[UBUNTU 23.04] Kernel config option missing for s390 PCI passthrough
Status in Ubuntu on IBM z Systems:
New
Status in linux package in Ubuntu:
New
Status in linux source package in Lunar:
New
Status in linux source package in Mantic:
New
Status in linux source package in Noble:
New
Bug description:
=== Description by mjros...@us.ibm.com ===
LP#1853306 / IBM bug 182254 backported the necessary kernel pieces to
enable enhanced interpretation of PCI passthrough on s390. It also
included a kernel config update for CONFIG_VFIO_PCI_ZDEV_KVM=y which
is necessary to activate this kernel feature.
For lunar and mantic, the kernel code did not require backporting due
to the base kernel version already containing it, but the kernel
config option still needs to be enabled. Comparison from
git.launchpad.net:
Jammy:
cat debian.master/config/annotations | grep CONFIG_VFIO_PCI_ZDEV_KVM
CONFIG_VFIO_PCI_ZDEV_KVM policy<{'s390x': 'y'}>
CONFIG_VFIO_PCI_ZDEV_KVM note<'LP#1853306 Enable VFIO
zPCI pass-through for s390x'>
Lunar:
cat debian.master/config/annotations | grep CONFIG_VFIO_PCI_ZDEV_KVM
CONFIG_VFIO_PCI_ZDEV_KVM policy<{'s390x': 'n'}>
Mantic:
cat debian.master/config/annotations | grep CONFIG_VFIO_PCI_ZDEV_KVM
CONFIG_VFIO_PCI_ZDEV_KVM policy<{'s390x': 'n'}>
This setting is supposed to default y when S390 && KVM via Kconfig.
Can this be enabled for lunar, mantic, and future releases?
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