linux-kernel - Re: [ANNOUNCE] Native Linux KVM tool

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Message-Id: <20110408154712.8319bf74.yoshikawa.takuya@oss.ntt.co.jp>
Date:	Fri, 8 Apr 2011 15:47:12 +0900
From:	Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Anthony Liguori <anthony@...emonkey.ws>,
	Ingo Molnar <mingo@...e.hu>, Avi Kivity <avi@...hat.com>,
	linux-kernel@...r.kernel.org, aarcange@...hat.com,
	mtosatti@...hat.com, kvm@...r.kernel.org, joro@...tes.org,
	penberg@...helsinki.fi, asias.hejun@...il.com, gorcunov@...il.com
Subject: Re: [ANNOUNCE] Native Linux KVM tool

Hi!

> Hi Anthony,
> 
> On Fri, Apr 8, 2011 at 5:14 AM, Anthony Liguori <anthony@...emonkey.ws> wrote:
> > If someone was going to seriously go about doing something like this, a
> > better approach would be to start with QEMU and remove anything non-x86 and
> > all of the UI/command line/management bits and start there.
> >
> > There's nothing more I'd like to see than a viable alternative to QEMU but
> > ignoring any of the architectural mistakes in QEMU and repeating them in a
> > new project isn't going to get there.
> 
> Hey, feel free to help out! ;-)
> 
> I don't agree that a working 2500 LOC program is 'repeating the same
> architectural mistakes' as QEMU. I hope you realize that we've gotten
> here with just three part-time hackers working from their proverbial
> basements. So what you call mistakes, we call features for the sake of
> simplicity.
> 
> I also don't agree with this sentiment that unless we have SMP,
> migration, yadda yadda yadda, now, it's impossible to change that in
> the future. It ignores the fact that this is exactly how the Linux
> kernel evolved and the fact that we're aggressively trying to keep the
> code size as small and tidy as possible so that changing things is as
> easy as possible.

Is it possible to find the code maintenance policy on a project site
or somewhere?  -- for both short run and long run.

I may get some interest in using this tool for my debugging/testing/
self-educational porpuses, but cannot know what I can do/expect.

Takuya
  For me, both QEMU and Native Linux KVM tool may be useful! :)
  But it is, probably I guess, for different porposes.


> 
> I've looked at QEMU sources over the years and especially over the
> past year and I think you might be way too familiar with its inner
> workings to see how complex (even the core code) has become for
> someone who isn't familiar with it. I think it has to do with lots of
> indirection and code cleanliness issues (and I think that was the case
> even before KVM came into the picture). So I don't agree at all that
> taking QEMU as a starting point would make things any easier. (That
> is, unless someone intimately familiar with QEMU does it.)

-- 
Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>
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