Merge tag 'migration-20230726-pull-request' of https://gitlab.com/juan.quintela/qemu into staging

Migration Pull request

Hi

This is the migration PULL request.  It is the same than yesterday with proper PULL headers.
It pass CI. It contains:
- Fabiano rosas trheadinfo cleanups
- Hyman Huang dirtylimit changes
- Part of my changes
- Peter Xu documentation
- Tejus updato to migration descriptions
- Wei want improvements for postocpy and multifd setup

Please apply.

Thanks, Juan.

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* tag 'migration-20230726-pull-request' of https://gitlab.com/juan.quintela/qemu: (25 commits)
  migration/rdma: Split qemu_fopen_rdma() into input/output functions
  qemu-file: Make qemu_file_get_error_obj() static
  qemu-file: Simplify qemu_file_shutdown()
  qemu_file: Make qemu_file_is_writable() static
  migration: Change qemu_file_transferred to noflush
  qemu-file: Rename qemu_file_transferred_ fast -> noflush
  qtest/migration-tests.c: use "-incoming defer" for postcopy tests
  migration: enforce multifd and postcopy preempt to be set before incoming
  migration: Update error description whenever migration fails
  docs/migration: Update postcopy bits
  migration: skipped field is really obsolete.
  migration-test: machine_opts is really arch specific
  migration-test: Create arch_opts
  migration-test: Make machine_opts regular with other options
  migration-test: Be consistent for ppc
  migration: Extend query-migrate to provide dirty page limit info
  migration: Implement dirty-limit convergence algo
  migration: Put the detection logic before auto-converge checking
  migration: Refactor auto-converge capability logic
  migration: Introduce dirty-limit capability
  ...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>