> -----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-gfx@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
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