https://lists.ubuntu.com/archives/kernel-team/2019-March/099651.html
** Also affects: linux-azure (Ubuntu Cosmic)
Importance: Undecided
Status: New
** Also affects: linux-azure (Ubuntu Disco)
Importance: Undecided
Status: New
** Also affects: linux-azure (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: linux-azure (Ubuntu Xenial)
Status: New => Fix Committed
** Changed in: linux-azure (Ubuntu Cosmic)
Status: New => Fix Committed
** Changed in: linux-azure (Ubuntu Disco)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1821934
Title:
[Hyper-V] Enable CONFIG_HOTPLUG_CPU in linux-azure
Status in linux-azure package in Ubuntu:
In Progress
Status in linux-azure source package in Xenial:
Fix Committed
Status in linux-azure source package in Cosmic:
Fix Committed
Status in linux-azure source package in Disco:
In Progress
Bug description:
We requested that CONFIG_HOTPLUG_CPU be disabled in bug 1776293.
However, due to a recently discovered security issue,
CONFIG_HOTPLUG_CPU needs to be re-enabled.
There are some patches on LKML to address this security issue, but
they are not in the Azure kernel yet, and may not be accepted upstream
in their current form. If your interested, those two patches are
available here:
https://lkml.org/lkml/2019/3/26/893
https://lkml.org/lkml/2019/3/26/894
https://lkml.org/lkml/2019/3/26/895
To mitigate this security issue, the nosmt option needs to be passed
on the boot line. However, the nosmt option will not work if
CONFIG_HOTPLUG_CPU is disabled, which is the primary reason it needs
to be turned back on at this time.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1821934/+subscriptions
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