Add a plain tcp test for guest-memfd.  Note that the test will be
automatically skipped whenever not supported (e.g. qemu compiled without
KVM, or host kernel doesn't support kvm, or old kernels, etc.).

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 tests/qtest/migration/precopy-tests.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tests/qtest/migration/precopy-tests.c b/tests/qtest/migration/precopy-tests.c
index 57ca623de5..88d2627efd 100644
--- a/tests/qtest/migration/precopy-tests.c
+++ b/tests/qtest/migration/precopy-tests.c
@@ -215,6 +215,16 @@ static void test_precopy_tcp_plain(void)
     test_precopy_common(&args);
 }
 
+static void test_precopy_tcp_plain_gmemfd(void)
+{
+    MigrateCommon args = {
+        .listen_uri = "tcp:127.0.0.1:0",
+        .start.mem_type = MEM_TYPE_GUEST_MEMFD,
+    };
+
+    test_precopy_common(&args);
+}
+
 static void test_precopy_tcp_switchover_ack(void)
 {
     MigrateCommon args = {
@@ -1276,6 +1286,8 @@ void migration_test_add_precopy(MigrationTestEnv *env)
         return;
     }
 
+    migration_test_add("/migration/precopy/tcp/plain/guest-memfd",
+                       test_precopy_tcp_plain_gmemfd);
     migration_test_add("/migration/precopy/tcp/plain/switchover-ack",
                        test_precopy_tcp_switchover_ack);
 
-- 
2.50.1