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

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Date:	Thu, 18 Mar 2010 18:02:23 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Anthony Liguori <anthony@...emonkey.ws>,
	Avi Kivity <avi@...hat.com>,
	"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


* Pekka Enberg <penberg@...helsinki.fi> wrote:

> On Thu, Mar 18, 2010 at 6:38 PM, Anthony Liguori <anthony@...emonkey.ws> wrote:
> >>>> There are all kernel space projects, going through Xorg would be a
> >>>> horrible waste of performance for full-screen virtualization. It's fine
> >>>> for the windowed or networked case (and good as a compatibility
> >>>> fallback), but very much not fine for local desktop use.
> >>
> >> For the full-screen case (which is a very common mode of using a guest OS
> >> on the desktop) there's not much of window management needed. You need to
> >> save/restore as you switch in/out.
> >
> > I don't think I've ever used full-screen mode with my VMs and I use
> > virtualization on a daily basis.
> >
> > We hear very infrequently from users using full screen mode.
> 
> Sorry for getting slightly off-topic but I find the above statement 
> interesting.
> 
> I don't use virtualization on daily basis but a working, fully integrated 
> full-screen model with VirtualBox was the only reason I bothered to give VMs 
> a second chance. From my point of view, the user experience of earlier 
> versions (e.g. Parallels) was just too painful to live with.

That's the same i do, and that's what i'm hearing from other desktop users as 
well.

The moment you work seriously in a guest OS you often want to switch to it 
full-screen, to maximize screen real-estate and to reduce host GUI element 
distractions. If it's just casual use of a single app then windowed mode 
suffices (but in that case performance doesnt matter much to begin with).

I find the 'KVM mostly cares about the server, not about the desktop' attitude 
expressed in this thread troubling.

> /me crawls back to his hole now...

/me should do that too - this discussion is not resulting in any positive 
result so it has become rather pointless.

	Ingo
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