[Xen-devel] Re: [Xen-changelog] Simpler domid allocation.

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 15 Jul 2005, at 16:40, Anthony Liguori wrote:

> > I understand your fears w.r.t. decentralised tools. One thing I think 
> > we will end up doing is adding the domain uuid (big unique domain 
> > identifier) to Xen. Xen will still work in terms of the short 16-bit 
> > domids, but control tools will be able to read out this extra unique 
> > key value which they can use to protect themselves against domid 
> > reuse in the absence of some other trusted authority. Invaluable for 
> > debugging screwed-up machine states too. :-)
> Excellent. The UUID would be part of the struct domain in Xen? Would 
> Xen create it and the tools just have an interface to get it? I'd be 
> happy to submit a patch to add this as it would be very useful for the 
> tools (since it effectively eliminates the possibility of race 
> conditions).
No, it would just be a 16-byte array settable via a dom0_op and 
returned by getdomaininfo. No reason for Xen to be responsible for 
creating it, and it has downsides:
 1. It would stop us from using an allocation strategy that 100% 
guarantees cluster-wide uniqueness
 2. We'd like domains to keep their uuids across reboots.

 -- Keir


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