[for-6.0,0/9] spapr: Perform hotplug sanity checks at pre-plug

Message

Greg Kurz Nov. 20, 2020, 11:41 p.m. UTC

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.

Greg Kurz (9):
  spapr: Do PCI device hotplug sanity checks at pre-plug only
  spapr: Do NVDIMM/PC-DIMM device hotplug sanity checks at pre-plug only
  spapr: Fix pre-2.10 dummy ICP hack
  spapr: Set compat mode in spapr_reset_vcpu()
  spapr: Simplify error path of spapr_core_plug()
  spapr: Make PHB placement functions and spapr_pre_plug_phb() return
    status
  spapr: Do PHB hoplug sanity check at pre-plug
  spapr: Do TPM proxy hotplug sanity checks at pre-plug
  spapr: spapr_drc_attach() cannot fail

 include/hw/ppc/spapr.h        |   2 +-
 include/hw/ppc/spapr_drc.h    |   8 +-
 include/hw/ppc/spapr_nvdimm.h |   2 +-
 hw/ppc/spapr.c                | 157 ++++++++++++++++------------------
 hw/ppc/spapr_cpu_core.c       |  13 +++
 hw/ppc/spapr_drc.c            |   8 +-
 hw/ppc/spapr_nvdimm.c         |  11 +--
 hw/ppc/spapr_pci.c            |  43 +++++++---
 8 files changed, 138 insertions(+), 106 deletions(-)