Merge tag 'migration-20240116-pull-request' of https://gitlab.com/peterx/qemu into...

Migration pull request 2nd batch for 9.0

- Het's cleanup on migration qmp command paths
- Fabiano's migration cleanups and test improvements
- Fabiano's patch to re-enable multifd-cancel test
- Peter's migration doc reorganizations
- Nick Briggs's fix for Solaries build on rdma

# -----BEGIN PGP SIGNATURE-----
#
# iIgEABYKADAWIQS5GE3CDMRX2s990ak7X8zN86vXBgUCZaX1PhIccGV0ZXJ4QHJl
# ZGhhdC5jb20ACgkQO1/MzfOr1wZSzwEAq6sp/ylNHLzNoMdWL28JLqCsb4DPYH2i
# u7XgYgT1qDAA/0vwoe4a5uFn1aaGCS+2d2syjJ8kOE7h+eZrbK520jsA
# =1zUG
# -----END PGP SIGNATURE-----
# gpg: Signature made Tue 16 Jan 2024 03:17:18 GMT
# gpg:                using EDDSA key B9184DC20CC457DACF7DD1A93B5FCCCDF3ABD706
# gpg:                issuer "peterx@redhat.com"
# gpg: Good signature from "Peter Xu <xzpeter@gmail.com>" [marginal]
# gpg:                 aka "Peter Xu <peterx@redhat.com>" [marginal]
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg:          It is not certain that the signature belongs to the owner.
# Primary key fingerprint: B918 4DC2 0CC4 57DA CF7D  D1A9 3B5F CCCD F3AB D706

* tag 'migration-20240116-pull-request' of https://gitlab.com/peterx/qemu:
  migration/rdma: define htonll/ntohll only if not predefined
  docs/migration: Further move virtio to be feature of migration
  docs/migration: Further move vfio to be feature of migration
  docs/migration: Organize "Postcopy" page
  docs/migration: Split "dirty limit"
  docs/migration: Split "Postcopy"
  docs/migration: Split "Debugging" and "Firmware"
  docs/migration: Split "Backwards compatibility" separately
  docs/migration: Convert virtio.txt into rST
  docs/migration: Create index page
  docs/migration: Create migration/ directory
  tests/qtest: Re-enable multifd cancel test
  tests/qtest/migration: Use the new migration_test_add
  tests/qtest/migration: Add a wrapper to print test names
  tests/qtest/migration: Print migration incoming errors
  migration: Report error in incoming migration
  migration/multifd: Change multifd_pages_init argument
  migration/multifd: Remove QEMUFile from where it is not needed
  migration/multifd: Remove MultiFDPages_t::packet_num
  migration: Simplify initial conditionals in migration for better readability

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>