On Tue, Dec 18, 2012 at 01:32:48PM +0100, Paolo Bonzini wrote:

+/**
+ * virtqueue_start_buf - start building buffer for the other end
+ * @vq: the struct virtqueue we're talking about.
+ * @buf: a struct keeping the state of the buffer
+ * @data: the token identifying the buffer.
+ * @count: the number of buffers that will be added

Perhaps count should be named count_bufs or num_bufs.

+ * @count_sg: the number of sg lists that will be added

What is the purpose of count_sg?

Stefan