Merge tag 'migration-20211214-pull-request' of https://gitlab.com/juan.quintela/qemu into staging

Migration Pull request

Hi

This are the reviewed patches for the freeze period:

- colo: fix/optimize several things (rao, chen)
- shutdown qio channels correctly when an error happens (li)
- serveral multifd patches for the zero series (me)

Please apply.

Thanks, Juan.

# gpg: Signature made Wed 15 Dec 2021 02:32:09 AM PST
# gpg:                using RSA key 1899FF8EDEBF58CCEE034B82F487EF185872D723
# gpg: Good signature from "Juan Quintela <quintela@redhat.com>" [full]
# gpg:                 aka "Juan Quintela <quintela@trasno.org>" [full]

* tag 'migration-20211214-pull-request' of https://gitlab.com/juan.quintela/qemu:
  multifd: Make zlib compression method not use iovs
  multifd: Make zstd compression method not use iovs
  COLO: Move some trace code behind qemu_mutex_unlock_iothread()
  multifd: Shut down the QIO channels to avoid blocking the send threads when they are terminated.
  multifd: Fill offset and block for reception
  multifd: remove used parameter from send_recv_pages() method
  multifd: remove used parameter from send_prepare() method
  multifd: The variable is only used inside the loop
  multifd: Add missing documention
  multifd: Rename used field to num
  migration: Never call twice qemu_target_page_size()
  multifd: Delete useless operation
  dump: Remove is_zero_page()
  migration: Remove is_zero_range()
  migration/colo: Optimize COLO primary node start code path
  Fixed a QEMU hang when guest poweroff in COLO mode
  migration/colo: More accurate update checkpoint time
  migration/ram.c: Remove the qemu_mutex_lock in colo_flush_ram_cache.

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

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