Merge tag 'migration-next-pull-request' of https://gitlab.com/peterx/qemu into staging

Migartion pull request for 20240304

- Bryan's fix on multifd compression level API
- Fabiano's mapped-ram series (base + multifd only)
- Steve's amend on cpr document in qapi/

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* tag 'migration-next-pull-request' of https://gitlab.com/peterx/qemu: (27 commits)
  migration/multifd: Document two places for mapped-ram
  tests/qtest/migration: Add a multifd + mapped-ram migration test
  migration/multifd: Add mapped-ram support to fd: URI
  migration/multifd: Support incoming mapped-ram stream format
  migration/multifd: Support outgoing mapped-ram stream format
  migration/multifd: Prepare multifd sync for mapped-ram migration
  migration/multifd: Add incoming QIOChannelFile support
  migration/multifd: Add outgoing QIOChannelFile support
  migration/multifd: Add a wrapper for channels_created
  migration/multifd: Allow receiving pages without packets
  migration/multifd: Allow multifd without packets
  migration/multifd: Decouple recv method from pages
  migration/multifd: Rename MultiFDSend|RecvParams::data to compress_data
  tests/qtest/migration: Add tests for mapped-ram file-based migration
  migration/ram: Add incoming 'mapped-ram' migration
  migration/ram: Add outgoing 'mapped-ram' migration
  migration: Add mapped-ram URI compatibility check
  migration/ram: Introduce 'mapped-ram' migration capability
  migration/qemu-file: add utility methods for working with seekable channels
  io: fsync before closing a file channel
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
# Conflicts:
#	migration/ram.c

diff --cc migration/ram.c
index 83fd780fc2e22f6028492c4984858e9531478dbb,c79e3de5216941ad76506a3f4b3ac2209b6548b1..003c28e1336a5fbe7a3877512b8fc3cf62f1bab3
--- 1/migration/ram.c
--- 2/migration/ram.c
+++ b/migration/ram.c
@@@ -3797,7 -4075,7 +4081,8 @@@ static int parse_ramblock(QEMUFile *f, 
      int ret = 0;
      /* ADVISE is earlier, it shows the source has the postcopy capability on */
      bool postcopy_advised = migration_incoming_postcopy_advised();
 +    int max_hg_page_size;
+     Error *local_err = NULL;
  
      assert(block);