Re: [Xen-devel] Proposal for init/kexec/hotplug format for Xen

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 27 Feb 2005, at 15:54, Anthony Liguori wrote:

> Yes.  I was only pointing out that I think the persistent store should 
> be in userspace.  One approach would be to have another tree within 
> the hypervisor that was the global persistent store.  An advantage of 
> that would be that it would be accessible by all domains without any 
> special supporting software (like a TCP/IP stack).
I think we will provide a custom protocol for allowing guest kernels to 
access the persistent store -- it needn't be very complicated, and will 
allow things like basic device bootstrap to be done via the store 
without any chicken-and-egg or deadlock problems. Also there may be 
security implications in allowing arbitrary guests to make TCP 
connections to domain0 (at the very least, there may be possible DoS 
attacks) -- of course we allow this by default right now, but we don't 
want to make it a requirement of using Xen.
> I think keeping the store in userspace has more advantages (mainly 
> robustness and extensibility).  It sounds like we're all in agreement 
> though :-)
Yes, I think we are. :-)

 -- Keir



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