RE: [PATCH] x86/hyper-v: Zero out the VP assist page to fix CPU offlining

From: Thomas Gleixner
Date: Thu Jul 18 2019 - 03:56:27 EST

On Thu, 18 Jul 2019, Dexuan Cui wrote:
> The concept of the "overlay page" seems weird, and frankly speaking,
> I don't really understand why the Hyper-V guys invented it, but as far
> as this patch here is concerned, I think the patch is safe and it can
> indeed fix the CPU offlining issue I described.

Then this needs some really good explanation and in the change log because
that's really obscure behaviour.