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[Bug 1821934] Re: [Hyper-V] Enable CONFIG_HOTPLUG_CPU in linux-azure

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Marcelo Cerri <1821934@xxxxxxxxxxxxxxxxxx>
Date: Thu, 30 May 2019 14:06:20 -0000
Reply-to: Bug 1821934 <1821934@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

I made a mistake on the disco patch and the buglink tag wasn't included.
However the change is already released in disco/linux-azure so I'm
marking it manually as "Fix Released".

** Changed in: linux-azure (Ubuntu Disco)
       Status: In Progress => Fix Released

** Changed in: linux-azure (Ubuntu Xenial)
     Assignee: (unassigned) => Marcelo Cerri (mhcerri)

** Changed in: linux-azure (Ubuntu Cosmic)
     Assignee: (unassigned) => Marcelo Cerri (mhcerri)

** Changed in: linux-azure (Ubuntu Disco)
     Assignee: (unassigned) => Marcelo Cerri (mhcerri)

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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:
  Fix Released
Status in linux-azure source package in Xenial:
  Fix Released
Status in linux-azure source package in Cosmic:
  Fix Released
Status in linux-azure source package in Disco:
  Fix Released

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.

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