[Qemu-devel] [PATCH v4 00/10] migration: objectify MigrationState

[Peter Xu <peterx@redhat.com>]

v4:
- dropped lots of patches related to AccelState.global_props. Now I am
  using AccelClass.global_props, and only use it in Xen codes.
- one patch is added to clean up the global property registerations,
  with some comment to show the ordering.
- one patch is added to dump migration globals in "info migrate"
  unconditionally (last patch).
- changed all the following xen_init() patches to use
  AccelClass.global_props.
- (since most of the patches are either touched-up again, or threw
  away, so no much r-b added, only one for Juan on the only_migratable
  patch, anyway, thanks for reviewing the old codes!)

------------

The main goal of this series is to let MigrationState be a QDev.

It helps in many use cases.

First of all, we can remove many legacy tricky functions. To name
some: savevm_skip_section_footers(), savevm_skip_configuration(), etc.
They didn't do much thing but setup a bool value. If MigrationState
can be a QDev, then these things can be setup by the HW_COMPAT_* magic
with some lines like:

{
    .driver   = "migration",
    .property = "send-configuration",
    .value    = "off",
}

Next, if this can be merged and okay, we can move on to convert more
things into properties for migration. A very attractive use case of it
is, we will be able to do this for migration:

  -global migration.postcopy=on

Then we don't need to use either HMP/QMP interface to enable it. It
greatly simplifies the migration test scripts.

Why QDev not QObject? The answer is simple: all the magic that we want
for migration is bound to QDev (HW_COMPAT, "-global"). If one day we
want to move these features from QDev to QObject, that'll be fine and
easy for MigrationState. But before that, let's have MigrationState a
QDev. :-)

Please kindly review. Thanks.

Peter Xu (10):
  machine: export register_compat_prop()
  accel: introduce AccelClass.global_props
  vl: clean up global property registerations
  migration: let MigrationState be a qdev
  migration: move global_state.optional out
  migration: move only_migratable to MigrationState
  migration: move skip_configuration out
  migration: move skip_section_footers
  migration: merge enforce_config_section somewhat
  migration: hmp: dump globals

 accel/accel.c                    |  10 ++++
 hmp.c                            |   3 +
 hw/core/machine.c                |  13 -----
 hw/core/qdev-properties.c        |  13 +++++
 hw/i386/pc_piix.c                |   3 -
 hw/ppc/spapr.c                   |   3 -
 hw/xen/xen-common.c              |  25 +++++++--
 include/hw/compat.h              |  12 ++++
 include/hw/qdev-properties.h     |   3 +
 include/migration/global_state.h |   1 -
 include/migration/misc.h         |   6 +-
 include/sysemu/accel.h           |  10 ++++
 include/sysemu/sysemu.h          |   1 -
 migration/global_state.c         |   9 +--
 migration/migration.c            | 118 +++++++++++++++++++++++++++++++--------
 migration/migration.h            |  33 +++++++++++
 migration/savevm.c               |  32 ++---------
 vl.c                             |  41 ++++++++++++--
 18 files changed, 246 insertions(+), 90 deletions(-)

-- 
2.7.4