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 19:52:29 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Avi Kivity <avi@...hat.com>
Cc:	"Frank Ch. Eigler" <fche@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Joerg Roedel <joro@...tes.org>,
	Anthony Liguori <anthony@...emonkey.ws>,
	"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>,
	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

Hi Avi,

On Mon, Mar 22, 2010 at 7:32 PM, Avi Kivity <avi@...hat.com> wrote:
>> It's kinda funny to see people argue that having an external
>> repository is not a problem and that it's not a big deal if building
>> something from the repository is slightly painful as long as it
>> doesn't require a PhD when we have _real world_ experience that it
>> _does_ limit developer base in some cases. Whether or not that applies
>> to kvm remains to be seen but I've yet to see a convincing argument
>> why it doesn't.
>
> qemu has non-Linux developers.  Not all of their contributions are relevant
> to kvm but some are.  If we pull qemu into tools/kvm, we lose them.

Yeah, you probably would but the hypothesis is that you'd end up with
a bigger net developer base for the _Linux_ version. Now you might not
think that's important but I certainly do and I think Ingo does as
well. ;-)

That said, pulling 400 KLOC of code into the kernel sounds really
excessive. Would we need all that if we just do native virtualization
and no actual emulation?

                       Pekka
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