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qtest/migration-tests.c: use "-incoming defer" for postcopy tests 

The Postcopy preempt capability is expected to be set before incoming
starts, so change the postcopy tests to start with deferred incoming and
call migrate-incoming after the cap has been set.

Why the existing tests (without this patch) didn't fail?
There could be two reasons:
1) "backlog" specifies the number of pending connections. As long as the
   server accepts the connections faster than the clients side connecting,
   connection will succeed. For the preempt test, it uses only 2 channels,
   so very likely to not have pending connections.
2) per my tests (on kernel 6.2), the number of pending connections allowed
   is actually "backlog + 1", which is 2 in this case.
That said, the implementation of socket_start_incoming_migration_internal
expects "migrate defer" to be used, and for safety, change the test to
work with the expected usage.

Signed-off-by: Wei Wang <wei.w.wang@intel.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20230606101910.20456-3-wei.w.wang@intel.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Wei Wang 2023-06-06 18:19:10 +08:00 committed by Juan Quintela
parent 82137e6c8c
commit 06c48d6b37
1 changed files with 4 additions and 2 deletions
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6
tests/qtest/migration-test.c
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@ -1239,10 +1239,9 @@ static int migrate_postcopy_prepare(QTestState **from_ptr,
QTestState **to_ptr,
MigrateCommon *args)
{
g_autofree char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs);
QTestState *from, *to;
if (test_migrate_start(&from, &to, uri, &args->start)) {
if (test_migrate_start(&from, &to, "defer", &args->start)) {
return -1;
}
@ -1262,10 +1261,13 @@ static int migrate_postcopy_prepare(QTestState **from_ptr,
migrate_ensure_non_converge(from);
migrate_prepare_for_dirty_mem(from);
qtest_qmp_assert_success(to, "{ 'execute': 'migrate-incoming',"
" 'arguments': { 'uri': 'tcp:127.0.0.1:0' }}");
/* Wait for the first serial output from the source */
wait_for_serial("src_serial");
g_autofree char *uri = migrate_get_socket_address(to, "socket-address");
migrate_qmp(from, uri, "{}");
migrate_wait_for_dirty_mem(from, to);