> -----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
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