linux-kernel - Re: [RFCv2 11/11] remoteproc: Support virtio config space.

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Message-ID: <20121221022150.GH28692@WorkStation.localnet>
Date:	Fri, 21 Dec 2012 04:21:50 +0200
From:	Ido Yariv <ido@...ery.com>
To:	Sjur Brændeland 
	<sjur.brandeland@...ricsson.com>
Cc:	Ohad Ben-Cohen <ohad@...ery.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-kernel@...r.kernel.org,
	Sjur Brændeland <sjur@...ndeland.net>
Subject: Re: [RFCv2 11/11] remoteproc: Support virtio config space.

Hi Sjur,

On Fri, Dec 14, 2012 at 05:07:00PM +0100, Sjur Brændeland wrote:
> Support virtio configuration space and device status and
> feature negotiation with remote device. This virtio device
> can now access the resource table in shared memory.
> 
> Signed-off-by: Sjur Brændeland <sjur.brandeland@...ricsson.com>
> ---

...

> +void rproc_virtio_get(struct virtio_device *vdev, unsigned offset,
> +							void *buf, unsigned len)
> +{
> +	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
> +	void *cfg = &rvdev->rsc->vring[rvdev->rsc->num_of_vrings];
> +	memcpy(buf, cfg + offset, len);
> +}
> +
> +void rproc_virtio_set(struct virtio_device *vdev, unsigned offset,
> +		      const void *buf, unsigned len)
> +{
> +	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
> +	void *cfg = &rvdev->rsc->vring[rvdev->rsc->num_of_vrings];
> +	memcpy(cfg + offset, buf, len);
>  }

Perhaps verify the offset and length to avoid overwriting memory?

Thanks,
Ido.
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