linux-kernel - RE: Merge Xen (the hypervisor) into Linux

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Date:	Tue, 2 Jun 2009 17:00:21 -0700 (PDT)
From:	Dan Magenheimer <dan.magenheimer@...cle.com>
To:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>
Cc:	George Dunlap <george.dunlap@...citrix.com>,
	David Miller <davem@...emloft.net>, jeremy@...p.org,
	avi@...hat.com, xen-devel@...ts.xensource.com, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Keir Fraser <Keir.Fraser@...citrix.com>,
	torvalds@...ux-foundation.org, gregkh@...e.de,
	kurt.hackel@...cle.com, Ian Pratt <Ian.Pratt@...citrix.com>,
	xen-users@...ts.xensource.com,
	ksrinivasan <ksrinivasan@...ell.com>, EAnderson@...ell.com,
	wimcoekaerts@...mekes.net,
	Stephen Spector <stephen.spector@...rix.com>,
	jens.axboe@...cle.com, npiggin@...e.de
Subject: RE: Merge Xen (the hypervisor) into Linux

That sound you heard was 10000 xen-users@...ts.xensource.com
all having heart attacks at once.

Need I say more.

> -----Original Message-----
> From: Ingo Molnar [mailto:mingo@...e.hu]
> Sent: Tuesday, June 02, 2009 5:29 PM
> To: Steven Rostedt
> Cc: George Dunlap; David Miller; jeremy@...p.org; Dan Magenheimer;
> avi@...hat.com; xen-devel@...ts.xensource.com; x86@...nel.org;
> linux-kernel@...r.kernel.org; Keir Fraser;
> torvalds@...ux-foundation.org; gregkh@...e.de; Kurt Hackel; Ian Pratt;
> xen-users@...ts.xensource.com; ksrinivasan; EAnderson@...ell.com;
> wimcoekaerts@...mekes.net; Stephen Spector; Jens Axboe; 
> npiggin@...e.de
> Subject: Merge Xen (the hypervisor) into Linux
> 
> 
> 
> * Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> > Now here's a crazy solution. Merge the Xen hypervisor into Linux 
> > ;-)
> 
> That's not that crazy - it's the right technical solution if DOM0 is 
> desired for upstream. From what i've seen in DOM0 land the incestous 
> dependencies are really only long-term manageable if the whole thing 
> is in a single tree.
> 
> A lot of Xen legacies could be dropped: the crazy ring1 hack on 
> 32-bit, the various wide interfaces to make pure-software 
> virtualization limp along. All major CPUs shipped with hardware 
> virtualization support in the past 2-3 years, so the availability of 
> VMX and SVM can be taken for granted for such a project.
> 
> That cuts down on a fair amount of crap. A lot of code on the Linux 
> side could be reused, and a pure CONFIG_PCI=y (all other things 
> disabled) would provide a "slim hypervisor" instance with a very 
> small and concentrated code base. (That 'slim hypervisor' might even 
> be built with CONFIG_NOMMU.)
> 
> That way dom0 would be a natural extension: a minimal interface 
> between Linux-Xen-minimal and the dom0 guest instance.
> 
> It's a sane technical model IMO, and makes dom0 a lot more 
> palatable. Having in-tree competition to KVM would also obviously be 
> good to Linux in general.
> 
> 	Ingo
>
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