[Qemu-devel] [RFC PATCH v1 00/13] CPU and Memory hotplug for PowerPC guests

[Bharata B Rao <bharata@linux.vnet.ibm.com>]

This patchset enables CPU and memory hotplug support for PowerPC guests.

Changes in this patchset (v1):

- Based on top of Michael Roth's tree
  (https://github.com/mdroth/qemu/commits/spapr-hotplug-core) which serves
  as base for his PCI hotplug patches too.
- Switched to device_add/del semantics instead of cpu-add.
- Supporting CPU hot unplug now.
- Added patches to enable memory hotplug.
- Added ibm,dynamic-reconfiguration-memory support which is needed for
  memory hotplug.

v0 - http://lists.nongnu.org/archive/html/qemu-devel/2014-09/msg00752.html

CPU hotplug
-----------
- Works with BE guest, has issues with LE guest. Has been tested on BE host
  only.
- Adding a core (and all its threads) in response to device_add command.
  Similarly removing a core via device_del will remove all the threads.
- Using Gu Zheng's "reclaim vCPU objects" patch to remove and reuse
  the vCPU objects after CPUs removal.
  (Gu Zheng's original patch:
   http://lists.gnu.org/archive/html/qemu-devel/2014-12/msg01829.html)

Memory hotplug
--------------
- Able to get an LMB added with the current patchset, but there are issues
  which I am still debugging.
- Re-using pc-dimm infrastructure (hw/mem/pc-dimm.c) to support memory
  hotplug on PowerPC.
- Tested with Nathan Fontenot's memory hotplug kernel patches (with additions
  to drive memory hotplug from EPOW interrupt path)
  (https://www.marc.info/?l=linuxppc-embedded&m=141626066317143&w=2)

Bharata B Rao (11):
  spapr: Add DRC dt entries for CPUs
  spapr: Consider max_cpus during xics initialization
  spapr: Factor out CPU initialization code into realizefn
  spapr: Support ibm,lrdr-capacity device tree property
  spapr: CPU hotplug support
  spapr: Start all the threads of CPU core when core is hotplugged
  spapr: Enable CPU hotplug for POWER8 CPU family
  spapr: CPU hot unplug support
  spapr: Initialize hotplug memory address space
  spapr: Support ibm,dynamic-reconfiguration-memory
  spapr: Memory hotplug support

Gu Zheng (1):
  cpus, spapr: reclaim allocated vCPU objects

Michael Roth (1):
  spapr: enable PHB/CPU/LMB hotplug for pseries-2.3

 cpus.c                            |  44 +++
 default-configs/ppc64-softmmu.mak |   1 +
 hw/ppc/spapr.c                    | 744 ++++++++++++++++++++++++++++++++++----
 hw/ppc/spapr_events.c             |  11 +-
 hw/ppc/spapr_hcall.c              |  51 ++-
 hw/ppc/spapr_rtas.c               |  28 +-
 include/hw/ppc/spapr.h            |  27 +-
 include/qom/cpu.h                 |  11 +
 include/sysemu/kvm.h              |   1 +
 kvm-all.c                         |  57 ++-
 target-ppc/translate_init.c       |  50 ++-
 11 files changed, 918 insertions(+), 107 deletions(-)

-- 
2.1.0