Merge tag 'migration-20240904-pull-request' of https://gitlab.com/farosas/qemu into staging

Migration pull request

- Steve's cleanup of unused variable
- Peter Maydell's fixes for several leaks in migration-test
- Fabiano's flexibilization of multifd data structures for device
  state migration
- Arman Nabiev's fix for ppc e500 migration
- Thomas' fix for migration-test vs. --without-default-devices

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* tag 'migration-20240904-pull-request' of https://gitlab.com/farosas/qemu: (34 commits)
  tests/qtest/migration: Add a check for the availability of the "pc" machine
  target/ppc: Fix migration of CPUs with TLB_EMB TLB type
  migration/multifd: Add documentation for multifd methods
  migration/multifd: Add a couple of asserts for p->iov
  migration/multifd: Fix p->iov leak in multifd-uadk.c
  migration/multifd: Stop changing the packet on recv side
  migration/multifd: Make MultiFDMethods const
  migration/multifd: Move nocomp code into multifd-nocomp.c
  migration/multifd: Register nocomp ops dynamically
  migration/multifd: Standardize on multifd ops names
  migration/multifd: Allow multifd sync without flush
  migration/multifd: Replace multifd_send_state->pages with client data
  migration/multifd: Don't send ram data during SYNC
  migration/multifd: Isolate ram pages packet data
  migration/multifd: Remove total pages tracing
  migration/multifd: Move pages accounting into multifd_send_zero_page_detect()
  migration/multifd: Replace p->pages with an union pointer
  migration/multifd: Make MultiFDPages_t:offset a flexible array member
  migration/multifd: Introduce MultiFDSendData
  migration/multifd: Pass in MultiFDPages_t to file_write_ramblock_iov
  ...

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