Re: [RFC PATCH] virtio_console: link vq to port with a privatepointer in struct virtqueue

From: Amit Shah
Date: Thu Apr 19 2012 - 02:21:22 EST

On (Wed) 18 Apr 2012 [15:33:33], Paolo Bonzini wrote:
> For virtio-scsi multiqueue support I would like to have an easy and
> fast way to go from a virtqueue to the internal struct for that
> queue.
> It turns out that virtio-serial has the same need, but it gets
> by with a simple list walk.
> This patch adds a pointer to struct virtqueue that is reserved for
> the virtio device, and uses it in virtio-serial.
> Cc: Amit Shah <amit.shah@xxxxxxxxxx>
> Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
> Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
> Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> ---
> Untested; what do you think? Would this patch be acceptable
> as is, or only with a more pressing need in virtio-scsi, or never?

Yes, this is useful. Saves taking a spin lock and walking the list
each time any data is received from the host.

Acked-by: Amit Shah <amit.shah@xxxxxxxxxx>


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