From mboxrd@z Thu Jan  1 00:00:00 1970
From: Olivier Galibert <galibert@pobox.com>
Subject: Re: [RFC] Unify KVM kernel-space and user-space code into a single project
Date: Sun, 21 Mar 2010 21:08:49 +0100
Message-ID: <20100321200849.GA51323@dspnet.fr.eu.org>
References: <4BA256FE.5080501@codemonkey.ws> <84144f021003180951s5207de16p1cdf4b9b04040222@mail.gmail.com> <20100318170223.GB9756@elte.hu> <4BA25E66.2050800@redhat.com> <20100318172805.GB26067@elte.hu> <4BA32E1A.2060703@redhat.com> <20100319085346.GG12576@elte.hu> <4BA3747F.60401@codemonkey.ws> <20100321191742.GD25922@elte.hu> <4BA67B2F.4030101@redhat.com>
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Cc: Ingo Molnar <mingo@elte.hu>,
	Anthony Liguori <anthony@codemonkey.ws>,
	Pekka Enberg <penberg@cs.helsinki.fi>,
	"Zhang, Yanmin" <yanmin_zhang@linux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Sheng Yang <sheng@linux.intel.com>,
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
	Marcelo Tosatti <mtosatti@redhat.com>,
	oerg Roedel <joro@8bytes.org>,
	Jes Sorensen <Jes.Sorensen@redhat.com>,
	Gleb Natapov <gleb@redhat.com>,
	Zachary Amsden <zamsden@redhat.com>, ziteng.huang@intel.com,
	Arnaldo Carvalho de Melo <acme@redhat.com>,
	Fr?d?ric Weisbecker <fweisbec@gmail.com>
To: Avi Kivity <avi@redhat.com>
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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.