linux-kernel - Re: [RFC PATCH] virtio_console: link vq to port with a private pointer in struct virtqueue

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Message-ID: <20120419061958.GA9980@amit.redhat.com>
Date:	Thu, 19 Apr 2012 11:51:16 +0530
From:	Amit Shah <amit.shah@...hat.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	"Michael S. Tsirkin" <mst@...hat.com>,
	virtualization@...ts.linux-foundation.org
Subject: Re: [RFC PATCH] virtio_console: link vq to port with a private
 pointer in struct virtqueue

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@...hat.com>
> Cc: Rusty Russell <rusty@...tcorp.com.au>
> Cc: "Michael S. Tsirkin" <mst@...hat.com>
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---
> 	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@...hat.com>

Thanks,

		Amit
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