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

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Date:	Mon, 22 Mar 2010 03:31:48 +0700
From:	Antoine Martin <antoine@...afix.co.uk>
To:	Avi Kivity <avi@...hat.com>
CC:	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 03/22/2010 03:24 AM, Avi Kivity wrote:
> On 03/21/2010 10:18 PM, Antoine Martin wrote:
>>> That includes the guest kernel.  If you can deploy a new kernel in 
>>> the guest, presumably you can deploy a userspace package.
>>
>> That's not always true.
>> The host admin can control the guest kernel via "kvm -kernel" easily 
>> enough, but he may or may not have access to the disk that is used in 
>> the guest. (think encrypted disks, service agreements, etc)
>
> There is a matching -initrd argument that you can use to launch a daemon.
I thought this discussion was about making it easy to deploy... and 
generating a custom initrd isn't easy by any means, and it requires 
access to the guest filesystem (and its mkinitrd tools).
>   I believe that -kernel use will be rare, though.  It's a lot easier 
> to keep everything in one filesystem.
Well, for what it's worth, I rarely ever use anything else. My virtual 
disks are raw so I can loop mount them easily, and I can also switch my 
guest kernels from outside... without ever needing to mount those disks.

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