> -----Original Message-----
> From: Gerd Hoffmann [mailto:kra...@redhat.com]
> Sent: Monday, July 17, 2017 7:03 PM
> To: Kirti Wankhede <kwankh...@nvidia.com>; Zhang, Tina
> <tina.zh...@intel.com>; Tian, Kevin <kevin.t...@intel.com>; linux-
> ker...@vger.kernel.org; intel-...@lists.freedesktop.org;
> alex.william...@redhat.com; zhen...@linux.intel.com; chris@chris-
> wilson.co.uk; Lv, Zhiyuan <zhiyuan...@intel.com>; intel-gvt-
> d...@lists.freedesktop.org; Wang, Zhi A <zhi.a.w...@intel.com>
> Subject: Re: [PATCH v10] vfio: ABI for mdev display dma-buf operation
>
> Hi,
>
> > No need of flag here. If vGPU driver is not loaded in the guest, there
> > is no surface being managed by vGPU, in that case this size will be
> > zero.
>
> Ok, we certainly have the same situation with intel. When the guest driver
> is not
> loaded (yet) there is no valid surface.
>
> We should cleanly define what the ioctl should do in that case, so all drivers
> behave the same way.
>
> I'd suggest that all fields defining the surface (drm_format, width, height,
> stride,
> size) should be set to zero in that case.
Yeah, it's reasonable. How about the return value? Currently, the ioctl also
returns "-ENODEV" in that situation.
thanks,
Tina
>
> cheers,
> Gerd
