[PATCH v2 10/23] xen/arm: compile and run xenbus

quoted

Right, the original patch didn't break anything with PV domains. The case
it doesn't handle is an HVM initial domain with an already-running
Xenstore domain; I think this applies both to ARM and hybrid/PVH on x86.
In that case, usage would be set to LOCAL instead of HVM.

Right, however if I am not mistaken there is no such thing as an HVM
dom0 right now on x86 and hybrid/PVH is probably going to return true on
xen_pv_domain() and false on xen_hvm_domain().

The other way around.  HVM = true, PV = false.

Mukesh, correct me if I am wrong pls.

In the ARM case, given that we don't have a start_info page, we would
need another way to figure out whether a xenstore stub domain is already
running, so I think we can just postpone the solution of that problem
for now.