linux-kernel - Re: [RFC PATCH 1/1] Move two pinned pages to non-movable node in kvm.

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Date:	Wed, 18 Jun 2014 09:12:30 +0300
From:	Gleb Natapov <gleb@...nel.org>
To:	Tang Chen <tangchen@...fujitsu.com>
Cc:	pbonzini@...hat.com, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, mgorman@...e.de, yinghai@...nel.org,
	isimatu.yasuaki@...fujitsu.com, guz.fnst@...fujitsu.com,
	laijs@...fujitsu.com, kvm@...r.kernel.org, linux-mm@...ck.org,
	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/1] Move two pinned pages to non-movable node in kvm.

On Wed, Jun 18, 2014 at 01:50:00PM +0800, Tang Chen wrote:
> [Questions]
> And by the way, would you guys please answer the following questions for me ?
> 
> 1. What's the ept identity pagetable for ?  Only one page is enough ?
> 
> 2. Is the ept identity pagetable only used in realmode ?
>    Can we free it once the guest is up (vcpu in protect mode)?
> 
> 3. Now, ept identity pagetable is allocated in qemu userspace.
>    Can we allocate it in kernel space ?
What would be the benefit?

> 
> 4. If I want to migrate these two pages, what do you think is the best way ?
> 
I answered most of those here: http://www.mail-archive.com/kvm@vger.kernel.org/msg103718.html

--
			Gleb.
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