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migration: Add zero-copy-send parameter for QMP/HMP for Linux

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Add property that allows zero-copy migration of memory pages
on the sending side, and also includes a helper function
migrate_use_zero_copy_send() to check if it's enabled.

No code is introduced to actually do the migration, but it allow
future implementations to enable/disable this feature.

On non-Linux builds this parameter is compiled-out.

Signed-off-by: Leonardo Bras <leobras@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20220513062836.965425-5-leobras@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Leonardo Bras 2022-05-13 03:28:33 -03:00 • committed by Dr. David Alan Gilbert
parent 2bc58ffc29
commit abb6295b3a
5 changed files with 76 additions and 2 deletions
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11
migration/socket.c
View file

@ -74,9 +74,16 @@ static void socket_outgoing_migration(QIOTask *task,
if (qio_task_propagate_error(task, &err)) {
trace_migration_socket_outgoing_error(error_get_pretty(err));
} else {
trace_migration_socket_outgoing_connected(data->hostname);
goto out;
}
trace_migration_socket_outgoing_connected(data->hostname);
if (migrate_use_zero_copy_send()) {
error_setg(&err, "Zero copy send not available in migration");
}
out:
migration_channel_connect(data->s, sioc, data->hostname, err);
object_unref(OBJECT(sioc));
}