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

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Message-ID: <20100321220052.GC13219@elte.hu>
Date:	Sun, 21 Mar 2010 23:00:52 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Avi Kivity <avi@...hat.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	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>,
	oerg Roedel <joro@...tes.org>,
	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


* Avi Kivity <avi@...hat.com> wrote:

> > Consider the _other_ examples that are a lot more clear:
> >
> >    ' If you expose paravirt spilocks via KVM please also make sure the KVM
> >      tooling can make use of it, has an option for it to configure it, and
> >      that it has sufficient efficiency statistics displayed in the tool for
> >      admins to monitor.'
> >
> >    ' If you create this new paravirt driver then please also make sure it can
> >      be configured in the tooling. '
> >
> >    ' Please also add a testcase for this bug to tools/kvm/testcases/ so we dont
> >      repeat this same mistake in the future. '
> 
> All three happen quite commonly in qemu/kvm development.  Of course someone 
> who develops a feature also develops a patch that exposes it in qemu.  There 
> are several test cases in qemu-kvm.git/kvm/user/test.

If that is the theory then it has failed to trickle through in practice. As 
you know i have reported a long list of usability problems with hardly a look. 
That list could be created by pretty much anyone spending a few minutes of 
getting a first impression with qemu-kvm.

So something is seriously wrong in KVM land, to pretty much anyone trying it 
for the first time. I have explained how i see the root cause of that, while 
you seem to suggest that there's nothing wrong to begin with. I guess we'll 
have to agree to disagree on that.

Thanks,

	Ingo
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