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This isn't really correct. The per-cpu area for the BSP is within the main image, which is why the logic functions today.  What's missing is the call to pcpu_setup_first_chunk() which tells per_cpu_ptr_to_phys() about where the BSP data is. I think you want to say: "A future change wants to use per_cpu_ptr_to_phys() in xen_setup_runstate_info(), but this call is too early.  It turns out to be no longer required since ..." > > [1] 8a22b9996b00 ("xen: drop xen_sched_clock in favour of using plain wallclock time") > --- Missing SoB. ~Andrew