[Qemu-devel] [RFC PATCH 0/5] asynchronous migration state change handlers

[Yonit Halperin <yhalperi@redhat.com>]

Hi,

I'm sending this patch series again. This time with an additional patch 
for setting a migrate_end notifier completion callback for spice migration
interface. I've also added more detailed commit messages.

This patch series introduces async handlers for notifiers, and integrates them
with migration state change notifications.

Asynchronous migration completion notifier is essential for allowing spice to cleanly
complete the src server connection to the client, and transfer the connection to the target.
Currently, as soon as the migration completes, the src qemu can be closed by the
management, and spice cannot complete the spice-connection migration.

In order to support spice seamless migration, next to these patches, I plan to add:
(1) notifier for switching from the live phase of the migration to the non-live phase,
    before completing savevm.
    Spice will use this notification to "finalize" the connection to the client: send
    and receive all in-flight data.
(2) add vmstates for spice data that need to be migrated, e.g., usb/agent/smartcard
    buffers that were sent from the client and haven't been written to device yet.
    We would also want to migrate data that will allow us to continue the new spice
    connection from the same point the old one stopped. Without requiring special
    treatment in the client side.

Regards,
Yonit.

Yonit Halperin (5):
  notifiers: add support for async notifiers handlers
  migration: moving migration start code to a separated routine
  migration: moving migration completion code to a separated routine
  migration: replace migration state change notifier with async
    notifiers
  spice: turn spice "migration end" handler to be async

 input.c         |    2 +-
 migration.c     |  154 ++++++++++++++++++++++++++++++++++++++++---------------
 migration.h     |   11 +++-
 notify.c        |   78 ++++++++++++++++++++++++++--
 notify.h        |   55 ++++++++++++++++++--
 qemu-timer.c    |    2 +-
 ui/spice-core.c |   58 +++++++++++++++------
 vl.c            |    2 +-
 8 files changed, 290 insertions(+), 72 deletions(-)

-- 
1.7.7.6