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

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Date:	Fri, 08 Jan 2010 14:55:40 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Bryan Donlan <bdonlan@...il.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 01/08/2010 02:30 PM, Bryan Donlan wrote:
> 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?

Good point, a malicious guest could do that and ruin
things for everyone.  I guess we do need a limit :)

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