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

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

Hi all,
   I resent this because most folks at Red Hat seemed to have problems
about receiving it the first time. Any comments are welcome.

Thanks,
Jianjun

On 06/10/2016 09:44 AM, Jianjun Duan wrote:
> 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: spapr_drc: defined VMStateDescription struct
>   migration: extend VMStateInfo
>   migration: migrate QTAILQ
>   migration: spapr: migrate ccs_list in spapr state
>   migration: spapr: 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(-)
>