linux-kernel - Re: [PATCH V3 6/7] virtio: introduce a mdev based transport

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Message-ID: <20191014173942.GB5359@stefanha-x1.localdomain>
Date:   Mon, 14 Oct 2019 18:39:42 +0100
From:   Stefan Hajnoczi <stefanha@...il.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     kvm@...r.kernel.org, linux-s390@...r.kernel.org,
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Subject: Re: [PATCH V3 6/7] virtio: introduce a mdev based transport

On Fri, Oct 11, 2019 at 04:15:56PM +0800, Jason Wang wrote:
> +struct virtio_mdev_device {
> +	struct virtio_device vdev;
> +	struct mdev_device *mdev;
> +	unsigned long version;
> +
> +	struct virtqueue **vqs;
> +	/* The lock to protect virtqueue list */
> +	spinlock_t lock;
> +	struct list_head virtqueues;

Is this a list of struct virtio_mdev_vq_info?  Please document the
actual type in a comment.

> +static int virtio_mdev_find_vqs(struct virtio_device *vdev, unsigned nvqs,
> +				struct virtqueue *vqs[],
> +				vq_callback_t *callbacks[],
> +				const char * const names[],
> +				const bool *ctx,
> +				struct irq_affinity *desc)
> +{
> +	struct virtio_mdev_device *vm_dev = to_virtio_mdev_device(vdev);
> +	struct mdev_device *mdev = vm_get_mdev(vdev);
> +	const struct virtio_mdev_device_ops *ops = mdev_get_dev_ops(mdev);
> +	struct virtio_mdev_callback cb;
> +	int i, err, queue_idx = 0;
> +
> +	vm_dev->vqs = kmalloc_array(queue_idx, sizeof(*vm_dev->vqs),
> +				    GFP_KERNEL);

kmalloc_array(0, ...)?  I would have expected nvqs instead of queue_idx
(0).

What is this the purpose of vm_dev->vqs and does anything ever access it?

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