[PATCH v2 0/2] vfio/migration: Make VFIO migration non-experimental

[Avihai Horon <avihaih@nvidia.com>]

Hello,

The major parts of VFIO migration are supported today in QEMU. This
includes basic VFIO migration, device dirty page tracking and precopy
support. Thus, at this point in time, it seems appropriate to make VFIO
migration non-experimental.

This short series (which is based on the precopy series [1]) does that
and also adds a few improvements:
- Patch #1 resets bytes_transferred counter properly.
- Patch #2 cleans up the VFIO migration realize flow and makes VFIO
  migration non-experimental.

Note that Zhenzhong's series [2] fixes additional bugs and further
cleans the VFIO migration realize flow.

Changes from v1 [3]:
* Dropped patch #1 as it's an optimization. (Cedric)
* Added Fixes tag to patch #2. (Cedric)
* Made VFIO device realization fail if migration is not supported and
  enable_migration is ON. (Cedric)
* Kept the error message of errno == ENOTTY case as it was in
  vfio_migration_query_flags(). (Cedric)
* Added a warn when enable_migration is ON and device dirty tracking is
  not supported. (Alex)
* Renamed trace_vfio_migration_probe() to
* trace_vfio_migration_realize().


Thanks.

[1]
https://lore.kernel.org/qemu-devel/20230621111201.29729-1-avihaih@nvidia.com/

[2]
https://lore.kernel.org/qemu-devel/20230621080204.420723-1-zhenzhong.duan@intel.com/

[3]
https://lore.kernel.org/qemu-devel/20230626082353.18535-1-avihaih@nvidia.com/

Avihai Horon (2):
  vfio/migration: Reset bytes_transferred properly
  vfio/migration: Make VFIO migration non-experimental

 include/hw/vfio/vfio-common.h |  7 +--
 migration/migration.h         |  1 +
 hw/vfio/common.c              | 16 ++++++-
 hw/vfio/migration.c           | 85 ++++++++++++++++++++++++-----------
 hw/vfio/pci.c                 |  4 +-
 migration/migration.c         |  1 +
 migration/savevm.c            |  1 +
 migration/target.c            | 17 ++++++-
 hw/vfio/trace-events          |  2 +-
 9 files changed, 97 insertions(+), 37 deletions(-)

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2.26.3