The "Host<-->Guest" calls in virtio_blk (using the generic virtio kick/notify) are as follows: Guest->Host ----------- do_virtlkb_request calls kick in the guest side causing handle_output to be called on the host side. Host->Guest ----------- virtio_blk_rw_complete calls notify in the host side causing block_done to be called on the guest side My question has to do with the timing of the calls. Which would be the correct drawing 1. Overlapping: kick |------------| handle_output |------------| 2. Disjoint: kick |------------| handle_output |------------| In other words: if I do g1 = get_cpu_cycles kick g2 = get_cpu_cycles and h1 = get_cpu_cycles handle_output h2 = get_cpu_cycles would (g2-g1) + (h2-h2) count some cycles twice? Same question for notify and block_done. Thanks very much, Eran -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
