Gerd Hoffmann wrote:

Anyone has this working?  Looks like there is a chicken-and-egg issue
with pda setup:

  * xen_load_gdt() uses multicalls, thus depends on cpu-specific
    variables (per-cpu mc buffer) which in turn requires pda being
    setup already.
  * pda setup can't be done before xen_load_gdt() ...
  

Good point.  I haven't done any SMP work yet, so if anything works at
all it is pure luck.

Next question while looking at xen_load_gdt(): why does it use
multicalls in the first place?  Seems that function puts only one
hypercall into the multicall array, so there is no obvious point in
using multicalls ...
  

I think you're right; I probably converted it when I swept through and
did the others without really thinking about the bootstrap consequences.

    J