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[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

Ok I have built a test kernel containing the missing patch above which
is here:

    http://people.canonical.com/~apw/hyperv-saucy/

I have also attempted to add the required rule to udev which is here:

    http://people.canonical.com/~apw/hyperv-saucy/udev/

If you could test those and confirm that this combination works as
expected.

Please note I have made some changes to the udev rule to firstly make it
use modern ATTR manipulation, and secondly to only apply it for hyper-v
guests.  Please report any testing back here.

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https://bugs.launchpad.net/bugs/1233466

Title:
  Hot-Add Memory failing for lack of udev rule

Status in “linux” package in Ubuntu:
  Fix Committed
Status in “systemd” package in Ubuntu:
  In Progress

Bug description:
  It appears that the Hot-Add mechanism is not working because of lack
  of a udev rule. The required rule is attached to this bug. Please
  include it.

  Furthermore, please ensure that the following patches are included:

  https://git.kernel.org/cgit/linux/kernel/git/next/linux-
  next.git/commit/drivers/hv?id=20138d6cb838aa01bb1b382dcb5f3d3a119ff2cb

  https://git.kernel.org/cgit/linux/kernel/git/next/linux-
  next.git/commit/drivers/hv?id=c5e2254f8d63a6654149aa32ac5f2b7dd66a976d

  https://git.kernel.org/cgit/linux/kernel/git/next/linux-
  next.git/commit/drivers/hv?id=ed07ec93e83ec471d365ce084e43ad90fd205903

  The above patches should be in but just wanted to ensure that you guys
  got these.

  Thanks again for the great last minute help.
  Abhishek

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