[Qemu-devel] [PATCH v3 00/19] pc: add CPU hot-add/hot-remove with device_add/device_del

[Igor Mammedov]

Changelog:
  since v2:
    * use 0xFFFFFFFF for UNASSIGNED_APIC_ID instead of UINT32_MAX
    * add comment why 0xFFFFFFFF could be used for UNASSIGNED_APIC_ID
    * print topo ids is unsigned
    * print APIC ID as hex
    * print topo ids calculated from APIC ID beside it
    * add extra patch to fix migration failure due to APIC's instance_id 
mismatch
  since v1:
    * s/pc_find_cpu/pc_find_cpu_slot/ + add comment to it
    * add more sanity checks for socket-id/core-id/thread-id and 'apic'
      properties
    * include device_del cpu patches and related fixes to x86 CPU/apic

Series enabling usage of -device/device_add for adding CPUs as devices
and device_del for removing them. Using -device/device_add in combination
with query-hotpluggable-cpus QMP command allows to hotplug CPUs at any
not used possition and then safely migrate QEMU instance by specifying
hotadded CPUs on target with help of -device CLI option like with any
other device.
Having been able to replicate exact topology on taggert with -device CPUs
also opens poosibility to hot-remove CPUs, which this series does by
enabling to use device_del with x86 CPUs.

Series depends on following not yet commited patchsets:
 1: [PATCH v2 0/6] cpus: make "-cpu cpux, features" global properties
      https://lists.gnu.org/archive/html/qemu-devel/2016-06/msg02579.html
    2: [PATCH v2 00/10] globals: Clean up validation and error checking
         https://lists.gnu.org/archive/html/qemu-devel/2016-06/msg05662.html

git tree for testing:
  https://github.com/imammedo/qemu.git dev_del_cpu_v3
for viewing:
  https://github.com/imammedo/qemu/commits/dev_del_cpu_v3

Tested with RHEL7.2 guest including ping/pong migration with adding/removing
CPUs in between.

Igor Mammedov (19):
  target-i386: cpu: use uint32_t for X86CPU.apic_id
  pc: add x86_topo_ids_from_apicid()
  pc: extract CPU lookup into a separate function
  pc: cpu: consolidate apic-id validity checks in pc_cpu_pre_plug()
  target-i386: cpu: replace custom apic-id setter/getter with static
    property
  target-i386: add socket/core/thread properties to X86CPU
  pc: set APIC ID based on socket/core/thread ids if it's not been set
    yet
  pc: implement query-hotpluggable-cpus callback
  pc: delay setting number of boot CPUs to machine_done time
  pc: register created initial and hotpluged CPUs in one place
    pc_cpu_plug()
  pc: cpu: allow device_add to be used with x86 cpu
  apic: move MAX_APICS check to 'apic' class
  apic: drop APICCommonState.idx and use APIC ID as index in
    local_apics[]
  (kvm)apic: add unrealize callbacks
  apic: use apic_id as apic's migration instance_id
  target-i386: cpu: do not ignore error and fix apic parent
  target-i386: fix apic object leak when CPU is deleted
  target-i386: add x86_cpu_unrealizefn()
  pc: make device_del CPU work for x86 CPUs

 hw/i386/kvm/apic.c              |   5 +
 hw/i386/pc.c                    | 233 ++++++++++++++++++++++++++++++++--------
 hw/intc/apic.c                  |  26 ++++-
 hw/intc/apic_common.c           |  33 ++++--
 include/hw/i386/apic_internal.h |   5 +-
 include/hw/i386/pc.h            |   5 +
 include/hw/i386/topology.h      |  15 +++
 qmp-commands.hx                 |  15 +++
 target-i386/cpu.c               |  88 ++++++---------
 target-i386/cpu.h               |  11 +-
 10 files changed, 320 insertions(+), 116 deletions(-)

-- 
2.7.0