Hi, Joe. Let's open a new bug when the patches are ready and we can disable CONFIG_HOTPLUG_CPU again.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-azure in Ubuntu. 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 -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
