[Qemu-devel] [QEMU RFC PATCH v4 0/6] migration: ensure hotplug and migration work together

[Jianjun Duan <duanj@linux.vnet.ibm.com>]

v4: - Introduce a way to set customized instance_id in SaveStateEntry. Use it
      to set instance_id for DRC using its unique index to address David 
      Gibson's concern.
    - Rename VMS_CSTM to VMS_LINKED based on Paolo Bonzini's suggestions.
    - Clean up qjson stuff in put_qtailq. 
    - Add trace for put_qtailq and get_qtailq based on David Gilbert's 
      suggestion.

It is based on David's ppc-for-2.7. Comments are welcome. Previous versions are:

v3: - Simplify overall design followng discussion with Paolo. No longer need
      metadata to migrate QTAILQ.
    - Extend VMStateInfo instead of adding similar fields to VMStateField.
    - Clean up macros in qemu/queue.h.
(link: https://lists.nongnu.org/archive/html/qemu-devel/2016-05/msg05695.html)

v2: - Introduce a general approach to migrate QTAILQ in qemu/queue.h.
    - Migrate signalled field in the DRC state.
    - Put the newly added migrating fields in subsections so that backward 
      migration is not broken.  
    - Set detach_cb field right after migration so that a migrated hot-unplug
      event could finish its course.
(link: https://lists.nongnu.org/archive/html/qemu-devel/2016-05/msg04188.html)

v1: - Inital version.
(link: https://lists.nongnu.org/archive/html/qemu-devel/2016-04/msg02601.html)

To make guest device (PCI, CPU and memory) hotplug work together 
with guest migration, spapr drc state needs be transmitted in
migration. This patch defines the VMStateDescription struct for
spapr drc state to enable it.

To fix the potential racing between hotplug events on guest and 
guest migration, ccs_list and pending_events of spapr state need be 
transmitted in migration. This patch also takes care of it.

Jianjun Duan (6):
  migration: alternative way to set instance_id in SaveStateEntry
  migration: defined VMStateDescription struct for spapr_drc
  migration: extend VMStateInfo
  migration: migrate QTAILQ
  migration: migrate ccs_list in spapr state
  migration: migrate pending_events of spapr state

 hw/net/vmxnet3.c            |  18 +++--
 hw/nvram/eeprom93xx.c       |   6 +-
 hw/nvram/fw_cfg.c           |   6 +-
 hw/pci/msix.c               |   6 +-
 hw/pci/pci.c                |  12 ++--
 hw/pci/shpc.c               |   5 +-
 hw/ppc/spapr.c              |  67 ++++++++++++++++++
 hw/ppc/spapr_drc.c          |  69 +++++++++++++++++++
 hw/ppc/spapr_events.c       |  22 +++---
 hw/ppc/spapr_pci.c          |  22 ++++++
 hw/scsi/scsi-bus.c          |   6 +-
 hw/timer/twl92230.c         |   6 +-
 hw/usb/redirect.c           |  18 +++--
 hw/virtio/virtio-pci.c      |   6 +-
 hw/virtio/virtio.c          |   6 +-
 include/hw/ppc/spapr.h      |   3 +-
 include/hw/ppc/spapr_drc.h  |   9 +++
 include/hw/qdev-core.h      |   6 ++
 include/migration/vmstate.h |  36 ++++++++--
 include/qemu/queue.h        |  32 +++++++++
 migration/savevm.c          |  25 +++++--
 migration/vmstate.c         | 161 ++++++++++++++++++++++++++++++++++----------
 target-alpha/machine.c      |   5 +-
 target-arm/machine.c        |  12 ++--
 target-i386/machine.c       |  21 ++++--
 target-mips/machine.c       |  10 +--
 target-ppc/machine.c        |  10 +--
 target-sparc/machine.c      |   5 +-
 trace-events                |   4 ++
 29 files changed, 505 insertions(+), 109 deletions(-)

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1.9.1