migration: Reference migration state around loadvm_postcopy_handle_run_bh
We need to hold a reference to the current_migration object around
async calls to avoid it been freed while still in use. Even on this
load-side function, we might still use the MigrationState, e.g to
check for capabilities.
Signed-off-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/20240119233922.32588-4-farosas@suse.de
Signed-off-by: Peter Xu <peterx@redhat.com>
diff --git a/migration/savevm.c b/migration/savevm.c
index 6410705..9338735 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -2174,6 +2174,7 @@
qemu_bh_delete(mis->bh);
trace_vmstate_downtime_checkpoint("dst-postcopy-bh-vm-started");
+ object_unref(OBJECT(migration_get_current()));
}
/* After all discards we can start running and asking for pages */
@@ -2189,6 +2190,7 @@
postcopy_state_set(POSTCOPY_INCOMING_RUNNING);
mis->bh = qemu_bh_new(loadvm_postcopy_handle_run_bh, mis);
+ object_ref(OBJECT(migration_get_current()));
qemu_bh_schedule(mis->bh);
/* We need to finish reading the stream from the package
