Removing excp_helper.c gives linker errors for the functions:
* ppc_cpu_do_system_reset, on hw/ppc/pnv.c and hw/ppc/spapr.c
Oof, that's a bit tricky. We definitely do need this system reset
injection for KVM as well as TCG. Unfortunately it calls into
powerpc_excp() which I think has a bunch of TCG specific stuff as
well.
Long term, I think the thing would be to remove the giant ugly
multiplexer in powerpc_excp() in favour of different entry points.
But that's a big job.
Short term, littering it with ifdefs might be the least worst we can
do. Richard, any better ideas?