Re: [PATCHv2 02/14] virtio ring: inline function to check for events

From: Rusty Russell
Date: Fri May 20 2011 - 22:35:50 EST

On Fri, 20 May 2011 02:10:27 +0300, "Michael S. Tsirkin" <mst@xxxxxxxxxx> wrote:
> With the new used_event and avail_event and features, both
> host and guest need similar logic to check whether events are
> enabled, so it helps to put the common code in the header.
> Note that Xen has similar logic for notification hold-off
> in include/xen/interface/io/ring.h with req_event and req_prod
> corresponding to event_idx + 1 and new_idx respectively.
> +1 comes from the fact that req_event and req_prod in Xen start at 1,
> while event index in virtio starts at 0.
> Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>


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