[RFC 0/7] migration patches for VFIO

[Juan Quintela]

Hi

VFIO migration has several requirements:
- the size of the state is only known when the guest is stopped
- they need to send possible lots of data.

this series only address the 1st set of problems.

What they do:
- res_compatible parameter was not used anywhere, just add that information to 
res_postcopy.
- Remove QEMUFILE parameter from save_live_pending
- Split save_live_pending into
  * save_pending_estimate(): the pending state size without trying too hard
  * save_pending_exact(): the real pending state size, it is called with the 
guest stopped.
- Now save_pending_* don't need the threshold parameter
- HACK a way to stop the guest before moving there.

ToDo:
- autoconverge test is broken, no real clue why, but it is possible that the 
test is wrong.

- Make an artifact to be able to send massive amount of data in the save state 
stage (probably more multifd channels).

- Be able to not having to start the guest between cheking the state pending 
size and migration_completion().

Please review.

Thanks, Juan.

Juan Quintela (7):
  migration: Remove res_compatible parameter
  migration: No save_live_pending() method uses the QEMUFile parameter
  migration: Block migration comment or code is wrong
  migration: Split save_live_pending() into state_pending_*
  migration: Remove unused threshold_size parameter
  migration: simplify migration_iteration_run()
  migration: call qemu_savevm_state_pending_exact() with the guest
    stopped

 docs/devel/migration.rst       | 18 ++++++------
 docs/devel/vfio-migration.rst  |  4 +--
 include/migration/register.h   | 29 ++++++++++---------
 migration/savevm.h             |  8 +++---
 hw/s390x/s390-stattrib.c       | 11 ++++---
 hw/vfio/migration.c            | 17 +++++------
 migration/block-dirty-bitmap.c | 14 ++++-----
 migration/block.c              | 17 ++++++-----
 migration/migration.c          | 52 ++++++++++++++++++++++------------
 migration/ram.c                | 35 ++++++++++++++++-------
 migration/savevm.c             | 37 +++++++++++++++++-------
 tests/qtest/migration-test.c   |  3 +-
 hw/vfio/trace-events           |  2 +-
 migration/trace-events         |  7 +++--
 14 files changed, 148 insertions(+), 106 deletions(-)

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2.37.2