[PATCH 0/3] Support chain migration in test

[phind.uet@gmail.com]

From: Nguyen Dinh Phi <phind.uet@gmail.com>

This series adds test infrastructure and test cases for multi-hop chain
migration, where a VM migrates from host A to B and then from B to C.

The migration test TODO list mentions ping-pong migration (A→B→A) as a
desirable scenario; the true ping-pong (A→B→A) would require the original
source A to become a destination for the return leg.
This is not possible: a QEMU process launched without -incoming cannot
later accept an incoming migration stream. Instead, this series implements
chain migration (A→B→C): B was already launched with -incoming and can
be re-wired as the source for the next hop, while a fresh QEMU instance C
is started as the new destination.

Nguyen Dinh Phi (3):
  tests/migration: Factor out per-process launch and setup helpers
  tests/migration: Retrieve serial path from QTestState
  tests/migration: Add chain (A to B to C) precopy migration tests

 tests/qtest/libqtest.c                |  16 +
 tests/qtest/libqtest.h                |   8 +
 tests/qtest/migration/colo-tests.c    |  14 +-
 tests/qtest/migration/cpr-tests.c     |   8 +-
 tests/qtest/migration/framework.c     | 475 ++++++++++++++++----------
 tests/qtest/migration/framework.h     |  21 +-
 tests/qtest/migration/misc-tests.c    |   4 +-
 tests/qtest/migration/precopy-tests.c |  51 ++-
 8 files changed, 389 insertions(+), 208 deletions(-)

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2.50.1 (Apple Git-155)