linux-kernel - Re: A proposal

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Date:	Fri, 4 Aug 2006 15:40:02 -0700 (PDT)
From:	David Lang <dlang@...italinsight.com>
To:	Jeff Dike <jdike@...toit.com>
cc:	Antonio Vargas <windenntw@...il.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andrew Morton <akpm@...l.org>, jeremy@...source.com,
	greg@...ah.com, zach@...are.com, linux-kernel@...r.kernel.org,
	torvalds@...l.org, hch@...radead.org, jlo@...are.com,
	xen-devel@...ts.xensource.com, simon@...source.com,
	ian.pratt@...source.com, jeremy@...p.org
Subject: Re: A proposal - binary

On Fri, 4 Aug 2006, Jeff Dike wrote:

> On Fri, Aug 04, 2006 at 12:49:13PM -0700, David Lang wrote:
>>> Why might you have to do that?
>>
>> take this with a grain of salt, I'm not saying the particular versions I'm
>> listing would require this
>>
>> if your new guest kernel wants to use some new feature (SKAS3, time
>> virtualization, etc) but the older host kernel didn't support some system
>> call nessasary to implement it, you may need to upgrade the host kernel to
>> one that provides the new features.
>
> OK, yeah.
>
> Just making sure you weren't thinking that the UML and host versions
> were tied together (although a modern distro won't boot on a 2.6 UML
> on a 2.4 host because UML's TLS needs TLS support on the host...).

this is exactly the type of thing that I think is acceptable.

this is a case of a new client needing a new host.

if you have a server running a bunch of 2.4 UMLs on a 2.4 host and want to add 
a 2.6 UML you can do it becouse you can shift to a buch of 2.4 UMLs (plus one 
2.6 UML) running on a 2.6 host.

what I would be bothered by was if you weren't able to run a 2.4 UML on a 2.6 
host becouse you have locked out the upgrade path

Everyone needs to remember that this sort of thing does happen, Xen2 clients 
cannot run on a Xen3 host.

David Lang
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