This series create compression code on top of multifd.  It is still
WIP, but it is already:
- faster that current compression code
- it does the minimum amount of copies possible
- we allow support for other compression codes
- it pass the multifd test sent in my previous series

Test for existing code didn't work because code is too slow, I need to
make downtime 10 times bigger to make it to converge on my test
machine.  This code works with same limits that multifd no-

ToDo:
- move printf's  to traces
- move code to a struct instead of if (zlib) inside the main threads.
- improve error handling.

Please, review and coment.

Juan Quintela (3):
  migration: Add multifd-compress parameter
  multifd: compression support variables
  multifd: Start of zlib compression code

 hmp.c                        |  23 +++++-
 hw/core/qdev-properties.c    |  11 +++
 include/hw/qdev-properties.h |   1 +
 migration/migration.c        |  25 ++++++
 migration/migration.h        |   1 +
 migration/ram.c              | 142 ++++++++++++++++++++++++++++++++++-
 migration/trace-events       |   2 +-
 qapi/common.json             |  15 ++++
 qapi/migration.json          |  20 ++++-
 9 files changed, 229 insertions(+), 11 deletions(-)

-- 
2.20.1