[PATCH v4 6/7] tests/qtest/vhost-user-test: add migrate_reconnect test

[Dima Stepanov]

Add new migrate_reconnect test for the vhost-user-blk device. Perform a
disconnect after sending response for the VHOST_USER_SET_LOG_BASE
command.

Signed-off-by: Dima Stepanov <dimas...@yandex-team.ru>
---
 tests/qtest/vhost-user-test.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/tests/qtest/vhost-user-test.c b/tests/qtest/vhost-user-test.c
index a8af613..4b715d3 100644
--- a/tests/qtest/vhost-user-test.c
+++ b/tests/qtest/vhost-user-test.c
@@ -146,6 +146,7 @@ static VhostUserMsg m __attribute__ ((unused));
 enum {
     TEST_FLAGS_OK,
     TEST_FLAGS_DISCONNECT,
+    TEST_FLAGS_MIGRATE_DISCONNECT,
     TEST_FLAGS_BAD,
     TEST_FLAGS_END,
 };
@@ -436,6 +437,15 @@ static void chr_read(void *opaque, const uint8_t *buf, int 
size)
         qemu_chr_fe_write_all(chr, p, VHOST_USER_HDR_SIZE);
 
         g_cond_broadcast(&s->data_cond);
+        /*
+         * Perform disconnect after sending a response. In this
+         * case the next write command on the QEMU side (for now
+         * it is SET_FEATURES will return -1, because of disconnect.
+         */
+        if (s->test_flags == TEST_FLAGS_MIGRATE_DISCONNECT) {
+            qemu_chr_fe_disconnect(chr);
+            s->test_flags = TEST_FLAGS_BAD;
+        }
         break;
 
     case VHOST_USER_SET_VRING_BASE:
@@ -737,6 +747,17 @@ static void *vhost_user_test_setup_memfd(GString 
*cmd_line, void *arg)
     return server;
 }
 
+static void *vhost_user_test_setup_migrate_reconnect(GString *cmd_line,
+        void *arg)
+{
+    TestServer *server;
+
+    server = vhost_user_test_setup_memfd(cmd_line, arg);
+    server->test_flags = TEST_FLAGS_MIGRATE_DISCONNECT;
+
+    return server;
+}
+
 static void test_read_guest_mem(void *obj, void *arg, QGuestAllocator *alloc)
 {
     TestServer *server = arg;
@@ -1150,5 +1171,9 @@ static void register_vhost_user_test(void)
     opts.before = vhost_user_test_setup_memfd;
     qos_add_test("migrate", "vhost-user-blk",
                  test_migrate, &opts);
+
+    opts.before = vhost_user_test_setup_migrate_reconnect;
+    qos_add_test("migrate_reconnect", "vhost-user-blk",
+                 test_migrate, &opts);
 }
 libqos_init(register_vhost_user_test);
-- 
2.7.4