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[Xen-devel] Re: [RFC, PATCH 0/24] VMI i386 Linux virtualization interfac

To: Zachary Amsden <zach@xxxxxxxxxx>
Subject: [Xen-devel] Re: [RFC, PATCH 0/24] VMI i386 Linux virtualization interface proposal
From: Arjan van de Ven <arjan@xxxxxxxxxxxxx>
Date: Mon, 13 Mar 2006 19:42:44 +0100
Cc: Andrew Morton <akpm@xxxxxxxx>, Joshua LeVasseur <jtl@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Pratap Subrahmanyam <pratap@xxxxxxxxxx>, Wim Coekaerts <wim.coekaerts@xxxxxxxxxx>, Chris Wright <chrisw@xxxxxxxx>, Jack Lo <jlo@xxxxxxxxxx>, Dan Hecht <dhecht@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxxxx>, Christopher Li <chrisl@xxxxxxxxxx>, Virtualization Mailing List <virtualization@xxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxx>, Anne Holler <anne@xxxxxxxxxx>, Jyothy Reddy <jreddy@xxxxxxxxxx>, Kip Macy <kmacy@xxxxxxxxxxx>, Ky Srinivasan <ksrinivasan@xxxxxxxxxx>, Leendert van Doorn <leendert@xxxxxxxxxxxxxx>, Dan Arai <arai@xxxxxxxxxx>
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On Mon, 2006-03-13 at 10:30 -0800, Zachary Amsden wrote:
> Arjan van de Ven wrote:
> >>   The interface we propose we 
> >> believe is more powerful, and more conducive to performance 
> >> optimizations while providing significant advantages - most 
> >> specifically, a single binary image that is properly virtualizable on 
> >> multiple hypervisors and capable of running on native hardware.
> >>     
> >
> > that is mostly an advantage in the binary would though.. less so in the
> > open source world.
> >   
> 
> It is an advantage for everyone.  It cuts support and certification 
> costs for Linux distributors,

that I'll buy
>  software vendors, 

that I'll buy a lot less except those with kernel modules (which is
evil ;)
> makes debugging and 
> development easier,

that I don't buy; a fixed interface tends to make debugging harder not
easier since you can't change it to add more information

>  and gives hypervisors room to grow while maintaining 
> binary compatibility with already released kernels.

that I buy for binary only hypervisors. But in an open source world I'll
buy this a LOT less as being relevant.



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