[PATCH for-6.0 v2 0/4] spapr: Perform hotplug sanity checks at pre-plug

[Greg Kurz]

Igor recently suggested that instead of failing in spapr_drc_attach()
at plug time we should rather check that the DRC is attachable at
pre-plug time. This allows to error out before the hot-plugged device
is even realized and to come up with simpler plug callbacks.

sPAPR currently supports hotplug of PCI devices, PHBs, CPU cores,
PC-DIMM/NVDIMM memory and TPM proxy devices. Some of these already
do sanity checks at pre-plug that are sufficient to ensure the DRC
are attachables. Some others don't even have a pre-plug handler.

This series adds the missing pieces so that all failing conditions
are caught at pre-plug time instead of plug time for all devices.

v2: - hopefully less fragile way of setting compat mode for hot-plugged
      CPUs

Greg Kurz (4):
  spapr: Fix pre-2.10 dummy ICP hack
  spapr: Abort if ppc_set_compat() fails for hot-plugged CPUs
  spapr: Simplify error path of spapr_core_plug()
  spapr: spapr_drc_attach() cannot fail

 include/hw/ppc/spapr_drc.h |  8 ++++++-
 hw/ppc/spapr.c             | 49 ++++++++++++++++++--------------------
 hw/ppc/spapr_drc.c         |  8 ++-----
 hw/ppc/spapr_nvdimm.c      |  2 +-
 hw/ppc/spapr_pci.c         |  2 +-
 5 files changed, 34 insertions(+), 35 deletions(-)

-- 
2.26.2