On Thu, Aug 10, 2017 at 10:35:11PM +0100, Richard W.M. Jones wrote:
> On Fri, Aug 11, 2017 at 12:31:44AM +0300, Michael S. Tsirkin wrote:
> > Then we probably should fail probe if vq size is too small.
>
> What does this mean?
>
> Rich.
We must prevent driver from submitting s/g lists > vq size to device.
Either tell linux to avoid s/g lists that are too long, or
simply fail request if this happens, or refuse to attach driver to device.
Later option would look something like this within probe:
for (i = VIRTIO_SCSI_VQ_BASE; i < num_vqs; i++)
if (vqs[i]->num < MAX_SG_USED_BY_LINUX)
goto err;
I don't know what's MAX_SG_USED_BY_LINUX though.
> --
> Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
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