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[Qemu-devel] [RFC PATCH v2 0/9] Core based CPU hotplug for PowerPC sPAPR

From: Bharata B Rao
Subject: [Qemu-devel] [RFC PATCH v2 0/9] Core based CPU hotplug for PowerPC sPAPR
Date: Fri, 11 Mar 2016 10:24:29 +0530


This is the next version of "Core based CPU hotplug for PowerPC sPAPR" that
was posted at

device_add semantics
For -smp 16,sockets=1,cores=2,threads=8,maxcpus=32
(qemu) device_add spapr-cpu-core,id=core2,core=16,cpu_model=host[,threads=8]

Major changes in this version
- Based on the review feedback, removed the links from machine object
  to the core objects.
- With that, the concept of using the links as slots where core object sits
  is gone.
- String slot name which was being used as slot= with device_add now
  becomes an integer core id being specified as core=.
- threads property which indicates the number of threads in the core
  moves from spapr-cpu-core type to cpu-core type.
- Threads creation moves from core's property setter to core's realizefn.
- Igor's proposed pre_plug handler isn't yet used in this patchset, but it
  wouldn't take much effort to switch to it. Waiting for some review/consensus
  on Igor's patchset before switching to it.
- This patchset will now work with Igor's query-hotpluggable-cpus QMP

Other changes
- Core ID that is used with device_add is in fact device tree ID now.
- DRC indexes are based on core_dt_id now. There are a couple of places
  where core device's thread0 is used to fetch the DRC index, but changing
  that requires bigger change of converting the CPUs DT code generation
  to iterate over cores instead of threads.
- Coverted while(1) to do-while() as suggeted by Thomas Huth (3/9).
- Creation of spapr-cpu-core device and conversion of boot CPUs into
  cores merged into a single patch (6/9).
- Topologies with incomplete cores are prevented from booting only with
  machine type versions that support CPU DR (6/9).
- Conversion of boot CPUs into cores is done only for machine type versions
  that support CPU DR (6/9).
- Take care of recovery from failure in plug handler when CPU hotplug isn't
  supported correctly. This will not be needed when we prevent such
  attempts from pre_plug handler (9/9).
Bharata B Rao (8):
  exec: Remove cpu from cpus list during cpu_exec_exit()
  exec: Do vmstate unregistration from cpu_exec_exit()
  cpu: Add a sync version of cpu_remove()
  cpu: Abstract CPU core type
  spapr: CPU core device
  spapr: CPU hotplug support
  xics,xics_kvm: Handle CPU unplug correctly
  spapr: CPU hot unplug support

Gu Zheng (1):
  cpu: Reclaim vCPU objects

 cpus.c                          |  51 +++++-
 exec.c                          |  41 ++++-
 hw/cpu/Makefile.objs            |   1 +
 hw/cpu/core.c                   |  87 ++++++++++
 hw/intc/xics.c                  |  14 ++
 hw/intc/xics_kvm.c              |   8 +-
 hw/ppc/Makefile.objs            |   1 +
 hw/ppc/spapr.c                  | 153 +++++++++++++++--
 hw/ppc/spapr_cpu_core.c         | 354 ++++++++++++++++++++++++++++++++++++++++
 hw/ppc/spapr_events.c           |   3 +
 hw/ppc/spapr_rtas.c             |  24 +++
 include/hw/cpu/core.h           |  31 ++++
 include/hw/ppc/spapr.h          |   7 +
 include/hw/ppc/spapr_cpu_core.h |  42 +++++
 include/hw/ppc/xics.h           |   1 +
 include/qom/cpu.h               |  18 ++
 include/sysemu/kvm.h            |   1 +
 kvm-all.c                       |  57 ++++++-
 kvm-stub.c                      |   5 +
 19 files changed, 871 insertions(+), 28 deletions(-)
 create mode 100644 hw/cpu/core.c
 create mode 100644 hw/ppc/spapr_cpu_core.c
 create mode 100644 include/hw/cpu/core.h
 create mode 100644 include/hw/ppc/spapr_cpu_core.h


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