Hi Bobby, Amery

Thank you for working on this!

This commit implements datagram support with a new version of
->dgram_allow().

Commit messages should be imperative "This commit implements X" -> "Implements X".
https://www.kernel.org/doc/html/latest/process/submitting-patches.html#describe-your-changes
This suggestion applies to many of the commits in this series.

+static bool virtio_transport_dgram_allow(u32 cid, u32 port)
+{
+	struct virtio_vsock *vsock;
+	bool dgram_allow;
+
+	dgram_allow = false;

I think you can initialize the variable in the declaration.

+	rcu_read_lock();
+	vsock = rcu_dereference(the_virtio_vsock);
+	if (vsock)
+		dgram_allow = vsock->dgram_allow;
+	rcu_read_unlock();
+
+	return dgram_allow;
+}
+

The rest LGTM.

Thanks,
Luigi