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So far no reply to that question but I only asked earlier today. I presume it is a complex technical question that cannot be answered without discussion with upstream Xen developers.
Actually I think Stormi is just extremely busy.
I'm pretty sure core isolation requires nested virtualization and thus is not supported at the moment.
XenServer developers recently contributed a patch series that removes a bit of technical debt from Xen, doing which was one of the steps towards proper nested virtualization support. There still remains a large amount of work onwards.
Indeed, no reboot required if those are the only patches that you are applying, as indicated in the blog post.
