This series refactors the ram compress code.

It first removes ram.c dependencies from the core compress code, then
moves it out to its own file. Finally, on the migration destination side
the initialisation and cleanup of compress threads is moved out of ram.c
to migration.c. This allows using COLO with compress enabled.

Changes since v1:
- Add postcopy tests with compress enabled
- Use page_size variable in "ram-compress.c: Make target independent"
- Squash "ram.c: Remove unused include after moving out code"
  with "ram.c: Move core compression code into its own file"
- Add Reviewed-by: Tags

Lukas Straub (13):
  qtest/migration-test.c: Add postcopy tests with compress enabled
  ram.c: Let the compress threads return a CompressResult enum
  ram.c: Dont change param->block in the compress thread
  ram.c: Reset result after sending queued data
  ram.c: Do not call save_page_header() from compress threads
  ram.c: Call update_compress_thread_counts from
    compress_send_queued_data
  ram.c: Remove last ram.c dependency from the core compress code
  ram.c: Introduce whitespace (squash with next patch)
  ram.c: Move core compression code into its own file
  ram.c: Remove whitespace (squash with previous patch)
  ram.c: Move core decompression code into its own file
  ram compress: Assert that the file buffer matches the result
  ram-compress.c: Make target independent

 migration/meson.build        |   5 +-
 migration/qemu-file.c        |  11 +
 migration/qemu-file.h        |   1 +
 migration/ram-compress.c     | 484 ++++++++++++++++++++++++++++++++++
 migration/ram-compress.h     |  70 +++++
 migration/ram.c              | 485 +++--------------------------------
 tests/qtest/migration-test.c |  83 +++---
 7 files changed, 660 insertions(+), 479 deletions(-)
 create mode 100644 migration/ram-compress.c
 create mode 100644 migration/ram-compress.h

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2.40.0