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

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Message-ID: <4BA7BD12.20008@redhat.com>
Date:	Mon, 22 Mar 2010 20:55:14 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
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

On 03/22/2010 08:10 PM, Pekka Enberg wrote:
> On Mon, Mar 22, 2010 at 8:04 PM, Avi Kivity<avi@...hat.com>  wrote:
>    
>>> 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?
>>>        
>> What is native virtualization and no actual emulation?
>>      
> What I meant with "actual emulation" was running architecture A code
> on architecture B what was qemu's traditional use case. So the
> question was how much of the 400 KLOC do we need for just KVM on all
> the architectures that it supports?
>    

qemu is 620 KLOC.  Without cpu emulation that drops to ~480 KLOC.  Much 
of that is device emulation that is not supported by kvm now (like ARM) 
but some might be needed again in the future (like ARM).

x86-only is perhaps 300 KLOC, but kvm is not x86 only.

And that is with a rudimentary GUI.  GUIs are heavy.

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

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