Merge tag 'migration-20231017-pull-request' of https://gitlab.com/juan.quintela/qemu...

Migration Pull request (20231017)

Hi

Same that yesterday one, except:
- rebased to latest (clean rebase)
- fixed 64 bits read on big endian host

CI: https://gitlab.com/juan.quintela/qemu/-/pipelines/1039214198

Please, apply.

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# gpg: Good signature from "Juan Quintela <quintela@redhat.com>" [full]
# gpg:                 aka "Juan Quintela <quintela@trasno.org>" [full]
# Primary key fingerprint: 1899 FF8E DEBF 58CC EE03  4B82 F487 EF18 5872 D723

* tag 'migration-20231017-pull-request' of https://gitlab.com/juan.quintela/qemu: (38 commits)
  migration/multifd: Clarify Error usage in multifd_channel_connect
  migration/multifd: Unify multifd_send_thread error paths
  migration/multifd: Remove direct "socket" references
  migration/ram: Merge save_zero_page functions
  migration/ram: Move xbzrle zero page handling into save_zero_page
  migration/ram: Stop passing QEMUFile around in save_zero_page
  migration/ram: Remove RAMState from xbzrle_cache_zero_page
  migration/ram: Refactor precopy ram loading code
  multifd: reset next_packet_len after sending pages
  multifd: fix counters in multifd_send_thread
  migration: check for rate_limit_max for RATE_LIMIT_DISABLED
  migration: Improve json and formatting
  migration/rdma: Remove all "ret" variables that are used only once
  migration/rdma: Declare for index variables local
  migration/rdma: Use i as for index instead of idx
  migration/rdma: Check sooner if we are in postcopy for save_page()
  migration/rdma: Remove qemu_ prefix from exported functions
  migration/rdma: Move rdma constants from qemu-file.h to rdma.h
  qemu-file: Remove QEMUFileHooks
  migration/rdma: Create rdma_control_save_page()
  ...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>