linux-kernel - Re: [RFC] Unify KVM kernel-space and user-space code into a single project

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Message-ID: <4BA6AF13.2030602@codemonkey.ws>
Date:	Sun, 21 Mar 2010 18:43:15 -0500
From:	Anthony Liguori <anthony@...emonkey.ws>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Avi Kivity <avi@...hat.com>,
	Antoine Martin <antoine@...afix.co.uk>,
	Pekka Enberg <penberg@...helsinki.fi>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Sheng Yang <sheng@...ux.intel.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	oerg Roedel <joro@...tes.org>,
	Jes Sorensen <Jes.Sorensen@...hat.com>,
	Gleb Natapov <gleb@...hat.com>,
	Zachary Amsden <zamsden@...hat.com>, ziteng.huang@...el.com,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Fr?d?ric Weisbecker <fweisbec@...il.com>
Subject: Re: [RFC] Unify KVM kernel-space and user-space code into a single
 project

On 03/21/2010 04:00 PM, Ingo Molnar wrote:
> * Avi Kivity<avi@...hat.com>  wrote:
>
>    
>> On 03/21/2010 09:59 PM, Ingo Molnar wrote:
>>      
>>> Frankly, i was surprised (and taken slightly off base) by both Avi and Anthony
>>> suggesting such a clearly inferior "add a demon to the guest space" solution.
>>> It's a usability and deployment non-starter.
>>>        
>> It's only clearly inferior if you ignore every consideration against it.
>> It's definitely not a deployment non-starter, see the tons of daemons that
>> come with any Linux system. [...]
>>      
> Avi, please dont put arguments into my mouth that i never made.
>
> My (clearly expressed) argument was that:
>
>      _a new guest-side demon is a transparent instrumentation non-starter_
>    

FWIW, there's no reason you couldn't consume a vmchannel port from 
within the kernel.  I don't think the code needs to be in the kernel and 
from a security PoV, that suggests that it should be in userspace IMHO.

But if you want to make a kernel thread, knock yourself out.  I have no 
objection to that from a qemu perspective.  I can't see why Avi would 
mind either.  I think it's papering around another problem (the kernel 
should control initrds IMHO) but that's a different topic.

Regards,

Anthony Liguori

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