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[Xen-devel] [RFC] Re-introduce VCPUOP_register_vcpu_info back for PVHVM guests. (v1)

Hey Jan,

While I've been digging around CPU hotplug for PVHVM I noticed an oddity
when running with different versions of hypervisor. I found out that the
big change you did in Xen 4.2 of splitting the PV and HVM arch structure
introduce the regression wherein VCPUOP_register_vcpu_info will not
work for PVHVM guests.

Interestingly enough if I introduce this back to the hypervisor the
CPU hotplug path gets even more broken for PVHVM :-).. But that is a Linux

But if it was not intentional, please see the patch and if you are 
happy also please back-port it to Xen 4.2 stable branch.

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