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Date: Wed, 3 Jun 2009 07:15:41 -0400
From: Theodore Tso <tytso@mit.edu>
To: Gerd Hoffmann <kraxel@redhat.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Dan Magenheimer <dan.magenheimer@oracle.com>,
       Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>,
       George Dunlap <george.dunlap@eu.citrix.com>,
       David Miller <davem@davemloft.net>, jeremy@goop.org, avi@redhat.com,
       xen-devel@lists.xensource.com, x86@kernel.org,
       linux-kernel@vger.kernel.org, Keir Fraser <Keir.Fraser@eu.citrix.com>,
       torvalds@linux-foundation.org, gregkh@suse.de, kurt.hackel@oracle.com,
       Ian Pratt <Ian.Pratt@eu.citrix.com>, xen-users@lists.xensource.com,
       ksrinivasan <ksrinivasan@novell.com>, EAnderson@novell.com,
       wimcoekaerts@wimmekes.net, Stephen Spector <stephen.spector@citrix.com>,
       jens.axboe@oracle.com, npiggin@suse.de
Subject: Re: Merge Xen (the hypervisor) into Linux
Message-ID: <20090603111541.GC31943@mit.edu>
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	Gerd Hoffmann <kraxel@redhat.com>,
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	Dan Magenheimer <dan.magenheimer@oracle.com>,
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On Wed, Jun 03, 2009 at 11:09:39AM +0200, Gerd Hoffmann wrote:
> On 06/03/09 10:47, Alan Cox wrote:
>>> Linux is not the only player here.  NetBSD can run as dom0 guest.
>>> Solaris can run as dom0 guest too.  Thus making the dom0/xen interface
>>> private to linux and xen isn't going to fly.
>>
>> It does not however preclude fixing the dom0 interface.
>
> It wasn't my intention to imply that.  The interface can be extended  
> when needed.  PAT support will probably be such a case.  Changing it in  
> incompatible ways isn't going to work though.

But that means that if there is some fundamentally broken piece of
dom0 design, that the Linux kernel will be stuck with it ***forever***
and it will contaminate code paths and make the code harder to
maintain ***forever*** if we consent to the Xen merge?  Is that really
what you are saying?   Be careful how you answer that....

     	     	       	  	      	  - Ted
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