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[Xen-users] Re: Merge Xen (the hypervisor) into Linux

To: Theodore Tso <tytso@xxxxxxx>, Gerd Hoffmann <kraxel@xxxxxxxxxx>
Subject: [Xen-users] Re: Merge Xen (the hypervisor) into Linux
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Wed, 03 Jun 2009 12:39:37 +0100
Cc: "jeremy@xxxxxxxx" <jeremy@xxxxxxxx>, "jens.axboe@xxxxxxxxxx" <jens.axboe@xxxxxxxxxx>, Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>, "npiggin@xxxxxxx" <npiggin@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, "kurt.hackel@xxxxxxxxxx" <kurt.hackel@xxxxxxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>, Stephen Spector <stephen.spector@xxxxxxxxxx>, "avi@xxxxxxxxxx" <avi@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, "wimcoekaerts@xxxxxxxxxxxx" <wimcoekaerts@xxxxxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>, ksrinivasan <ksrinivasan@xxxxxxxxxx>, "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>, "gregkh@xxxxxxx" <gregkh@xxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "EAnderson@xxxxxxxxxx" <EAnderson@xxxxxxxxxx>, "torvalds@xxxxxxxxxxxxxxxxxxxx" <torvalds@xxxxxxxxxxxxxxxxxxxx>, David Miller <davem@xxxxxxxxxxxxx>
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On 03/06/2009 12:15, "Theodore Tso" <tytso@xxxxxxx> wrote:

>>> 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....

It's not true, if you are prepared for a new dom0 kernel to require a new
version of Xen (which seems not unreasonable). We're happy to make
reasonable interface changes, and deal with compatibility issues as
necessary within Xen.

 -- Keir



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