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

[Dexuan Cui]

> From: Thomas Gleixner <tglx at linutronix.de>
> Sent: Thursday, July 18, 2019 12:56 AM
> To: Dexuan Cui <decui at microsoft.com>
> 
> 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.
> 
> 	tglx

Agreed. I'll combine my replies into the changelog and post a v2 of
the one-line patch.

Thanks,
-- Dexuan