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SubjectRe: [PATCH RFC v8 02/11] vhost: use batched get_vq_desc version
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On 2020/6/11 下午7:34, Michael S. Tsirkin wrote:
> static void vhost_vq_free_iovecs(struct vhost_virtqueue *vq)
> {
> kfree(vq->descs);
> @@ -394,6 +400,9 @@ static long vhost_dev_alloc_iovecs(struct vhost_dev *dev)
> for (i = 0; i < dev->nvqs; ++i) {
> vq = dev->vqs[i];
> vq->max_descs = dev->iov_limit;
> + if (vhost_vq_num_batch_descs(vq) < 0) {
> + return -EINVAL;
> + }


This check breaks vdpa which set iov_limit to zero. Consider iov_limit
is meaningless to vDPA, I wonder we can skip the test when device
doesn't use worker.

Thanks

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