@@ -74,6 +74,8 @@ struct vhost_dev {
int nvqs;
/* the first virtqueue which would be used by this vhost dev */
int vq_index;
+ /* if non-zero, minimum required value for max_queues */
+ int num_queues;
uint64_t features;
uint64_t acked_features;
uint64_t backend_features;
@@ -324,6 +324,7 @@ static int vhost_user_blk_connect(DeviceState *dev, Error **errp)
}
s->connected = true;
+ s->dev.num_queues = s->num_queues;
s->dev.nvqs = s->num_queues;
s->dev.vqs = s->vhost_vqs;
s->dev.vq_index = 0;
@@ -1909,6 +1909,11 @@ static int vhost_user_backend_init(struct vhost_dev *dev, void *opaque)
return err;
}
}
+ if (dev->num_queues && dev->max_queues < dev->num_queues) {
+ error_report("The maximum number of queues supported by the "
+ "backend is %" PRIu64, dev->max_queues);
+ return -EINVAL;
+ }
if (virtio_has_feature(features, VIRTIO_F_IOMMU_PLATFORM) &&
!(virtio_has_feature(dev->protocol_features,