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RE: [Xen-devel] Xen compatibility interface numbering

To: "Rich Persaud" <rich.p@xxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] Xen compatibility interface numbering
From: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date: Mon, 7 Mar 2005 07:50:17 -0000
Cc: <ian.pratt@xxxxxxxxxxxx>
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Thread-topic: [Xen-devel] Xen compatibility interface numbering
> Questions about compatibility between dom0 and domU kernels.   In the 
> ideal situation, all domU kernels would be patched to the 
> same level of 
> Xen in dom0.   What happens if they are not?
> 1.  Can an incompatible domU take down or in any way 
> interfere with dom0?

> 2.  Does Xen/dom0/Xend perform version checking on domUs?


> 3.  Can a binary Xen kernel be queried for its compatibility version?

There's a dom0 op that queries the interface version.

> 4.  How frequently does the Xen compatibility interface change?

Only when there's a major release number change.

> 5.  Can I run a 2.4 domU against a 2.6 dom0 and vice-versa, 
> if both are 
> patched to the same level of Xen?

Yes. You can play with this on the Demo CD.


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