> -----Original Message-----
> From: Gerd Hoffmann [mailto:[email protected]]
> Sent: Monday, July 17, 2017 7:03 PM
> To: Kirti Wankhede <[email protected]>; Zhang, Tina
> <[email protected]>; Tian, Kevin <[email protected]>; linux-
> [email protected]; [email protected];
> [email protected]; [email protected]; chris@chris-
> wilson.co.uk; Lv, Zhiyuan <[email protected]>; intel-gvt-
> [email protected]; Wang, Zhi A <[email protected]>
> 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
