linux-kernel - Re: [PATCH v3 00/12] KVM: Add host swap event notifications for PV guest

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Message-ID: <3e8340491001081130v2adb8e07k3b32f7f860daf603@mail.gmail.com>
Date:	Fri, 8 Jan 2010 14:30:55 -0500
From:	Bryan Donlan <bdonlan@...il.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Marcelo Tosatti <mtosatti@...hat.com>,
	Gleb Natapov <gleb@...hat.com>, kvm@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, avi@...hat.com,
	mingo@...e.hu, a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	hpa@...or.com, cl@...ux-foundation.org
Subject: Re: [PATCH v3 00/12] KVM: Add host swap event notifications for PV 
	guest

On Fri, Jan 8, 2010 at 2:24 PM, Rik van Riel <riel@...hat.com> wrote:
> On 01/08/2010 11:18 AM, Marcelo Tosatti wrote:
>
>> - Limit the number of queued async pf's per guest ?
>
> This is automatically limited to the number of processes
> running in a guest :)

Only if the guest is nice and plays by the rules. What is to stop a
malicious guest from just immediately switching back to userspace and
kicking off another page-in every time it gets an async PF?
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