On Sat, Apr 10, 2021 at 12:16 AM Michael S. Tsirkin <mst@xxxxxxxxxx> wrote:
>
> On Wed, Mar 31, 2021 at 04:05:12PM +0800, Xie Yongji wrote:
> > Use vhost_dev->mutex to protect vhost device iotlb from
> > concurrent access.
> >
> > Fixes: 4c8cf318("vhost: introduce vDPA-based backend")
> > Cc: stable@xxxxxxxxxxxxxxx
> > Signed-off-by: Xie Yongji <xieyongji@xxxxxxxxxxxxx>
> > Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
> > Reviewed-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>
>
> I could not figure out whether there's a bug there now.
> If yes when is the concurrent access triggered?
>
When userspace sends the VHOST_IOTLB_MSG_V2 message concurrently?
vhost_vdpa_chr_write_iter -> vhost_chr_write_iter ->
vhost_vdpa_process_iotlb_msg()
Thanks,
Yongji
