linux-kernel - Re: [PATCH] driver/virtio: Add Memory Balloon Support for SEV/SEV-ES

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Message-ID: <CACGkMEvqg3cqbPDvYe3qAh2BQKNbKYim27or08WsxCAMHmYO6g@mail.gmail.com>
Date: Thu, 11 Jan 2024 11:20:25 +0800
From: Jason Wang <jasowang@...hat.com>
To: Zheyun Shen <szy0127@...u.edu.cn>
Cc: linux-kernel@...r.kernel.org, virtualization@...ts.linux.dev, 
	mst <mst@...hat.com>, david <david@...hat.com>, xuanzhuo@...ux.alibaba.com
Subject: Re: [PATCH] driver/virtio: Add Memory Balloon Support for SEV/SEV-ES

On Wed, Jan 10, 2024 at 2:23 PM Zheyun Shen <szy0127@...u.edu.cn> wrote:
>
> For now, SEV pins guest's memory to avoid swapping or
> moving ciphertext, but leading to the inhibition of
> Memory Ballooning.
>
> In Memory Ballooning, only guest's free pages will be relocated
> in balloon inflation and deflation, so the difference of plaintext
> doesn't matter to guest.

This seems only true if the page is zeroed, is this true here?

Thanks