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

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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