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

From: Dexuan Cui
Date: Thu Jul 18 2019 - 04:04:51 EST

> From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Sent: Thursday, July 18, 2019 12:56 AM
> To: Dexuan Cui <decui@xxxxxxxxxxxxx>
> 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.

-- Dexuan