[PATCH 0/8] migration: cleanups, fixes and micro-optimizations

[Bin Guo <guobin@linux.alibaba.com>]

This series collects several small improvements to the migration
subsystem:

- Bug fix: off-by-one in multifd recv channel ID validation that
  could allow an out-of-bounds write (patch 5).
- Micro-optimizations: cache migrate_multifd_channels() in hot
  paths (patches 7-8), use stack-allocated bitmap instead of
  heap (patch 4), avoid per-element heap churn in vmstate ptr
  marker field (patch 3).
- Cleanups: collapse migration_fd_valid into a single boolean
  expression (patch 1), replace strcpy("") with explicit NUL
  termination (patch 2), merge thread-join and cleanup loops in
  multifd_recv_cleanup (patch 6).

No functional change intended except for the off-by-one fix in
patch 5.

Bin Guo (8):
  migration/fd: collapse migration_fd_valid into single boolean
    expression
  migration/global_state: replace strcpy("") with explicit NUL
    termination
  migration/vmstate: avoid per-element heap churn in vmsd ptr marker
    field
  migration/savevm: use stack-allocated bitmap in
    configuration_validate_capabilities
  migration/multifd: fix off-by-one in recv channel ID validation
  migration/multifd: merge thread-join and cleanup loops in
    multifd_recv_cleanup
  migration/multifd: cache migrate_multifd_channels() in send/recv hot
    paths
  migration/multifd: cache channel count in multifd_send_sync_main

 migration/fd.c           | 10 +---------
 migration/global_state.c |  2 +-
 migration/multifd.c      | 32 +++++++++++++++++--------------
 migration/savevm.c       |  5 ++---
 migration/vmstate.c      | 41 ++++++++++++++++------------------------
 5 files changed, 38 insertions(+), 52 deletions(-)

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2.50.1 (Apple Git-155)