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

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Message-ID: <4BA67D75.8060809@redhat.com>
Date:	Sun, 21 Mar 2010 22:11:33 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Olivier Galibert <galibert@...ox.com>, Ingo Molnar <mingo@...e.hu>,
	Anthony Liguori <anthony@...emonkey.ws>,
	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 10:08 PM, Olivier Galibert wrote:
> On Sun, Mar 21, 2010 at 10:01:51PM +0200, Avi Kivity wrote:
>    
>> On 03/21/2010 09:17 PM, Ingo Molnar wrote:
>>      
>>> Adding any new daemon to an existing guest is a deployment and usability
>>> nightmare.
>>>
>>>        
>> The logical conclusion of that is that everything should be built into
>> the kernel.  Where a failure brings the system down or worse.  Where you
>> have to bear the memory footprint whether you ever use the functionality
>> or not.  Where to update the functionality you need to deploy a new
>> kernel (possibly introducing unrelated bugs) and reboot.
>>
>> If userspace daemons are such a deployment and usability nightmare,
>> maybe we should fix that instead.
>>      
> Which userspace?  Deploying *anything* in the guest can be a
> nightmare, including paravirt drivers if you don't have a natively
> supported in the OS virtual hardware backoff.

That includes the guest kernel.  If you can deploy a new kernel in the 
guest, presumably you can deploy a userspace package.

> Deploying things in the
> host OTOH is business as usual.
>    

True.

> And you're smart enough to know that.
>    

Thanks.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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