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

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Message-ID: <4D9ED146.7040004@siemens.com>
Date:	Fri, 08 Apr 2011 11:11:34 +0200
From:	Jan Kiszka <jan.kiszka@...mens.com>
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" <linux-kernel@...r.kernel.org>,
	"aarcange@...hat.com" <aarcange@...hat.com>,
	"mtosatti@...hat.com" <mtosatti@...hat.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"joro@...tes.org" <joro@...tes.org>,
	"asias.hejun@...il.com" <asias.hejun@...il.com>,
	"gorcunov@...il.com" <gorcunov@...il.com>
Subject: Re: [ANNOUNCE] Native Linux KVM tool

On 2011-04-08 10:27, Pekka Enberg wrote:
> Hi Jan,
> 
> On Fri, 2011-04-08 at 09:39 +0200, Jan Kiszka wrote:
>> I agree that it's easy to change 2kSomething LOC for this. But if you
>> now wait too long designing in essential features like SMP, a scalable
>> execution model, and - very important - portability (*), it can get
>> fairly painful to fix such architectural deficits later on. How long did
>> it take for Linux to overcome the BKL? QEMU is in the same unfortunate
>> position.
> 
> Yup, and we're taking your feedback seriously (and are thankful for
> it!). We're hoping to look at SMP in the near future - help is
> appreciated!

Honestly, I do not yet see a major advantage for us to invest here
instead of / in addition to continuing to improve QEMU. We've spend
quite some effort on the latter with IMO noteworthy results. Porting
over qemu-kvm to upstream was and still is among those efforts. We (*)
are "almost done". :)

Just one example: Despite QEMU's current deficits, I just have add a
handful of (ad-hoc) patches to turn it into a (soft) real-time
hypervisor, and that also for certain non-Linux guests. Your approach is
yet man years of development and stabilization effort away from getting
close to such a level.

Don't want to discourage you or other contributors. I wish you that this
approach can gather the critical mass and momentum to make it a real
alternative, at least for a subset of use cases. We will surely keep an
eye on it and re-assess its pros&cons as it progresses.

Jan

(*) the QEMU & KVM community

-- 
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
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