Comment 1 for bug 1747970

Yes, I confirm this is the patch we need for the Enhanced Session mode.

The patch was originally made to fix a different issue, but it can also fix the VM panic we see with Enhanced Session mode, because the cause is the same: there is a race

static int __init hvs_init(void)
{
        int ret;

        if (vmbus_proto_version < VERSION_WIN10)
                return -ENODEV;

        ret = vmbus_driver_register(&hvs_drv);
        if (ret != 0)
                return ret;
Dexuan: ---------------------------: if the host-initiated connection comes here (e.g. before we call vsock_core_init(), hvs_open_connection() -> vsock_find_bound_socket() -> __vsock_find_bound_socket() can access the uninitialized vsock_bound_sockets(addr) -> vsock_bind_table, which will be initialized in vsock_core_init() -> vsock_init_tables(), and we'll hit a panic.

        ret = vsock_core_init(&hvs_transport);
        if (ret) {
                vmbus_driver_unregister(&hvs_drv);
                return ret;
        }

        return 0;
}

The latest upstream 4.15.1 kernel has the fix already, but 4.14.17 doesn't have the fix.