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

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Message-ID: <20100321200849.GA51323@dspnet.fr.eu.org>
Date:	Sun, 21 Mar 2010 21:08:49 +0100
From:	Olivier Galibert <galibert@...ox.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	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 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.  Deploying things in the
host OTOH is business as usual.

And you're smart enough to know that.

  OG.
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