Re: [libvirt] [PATCH 0/3] sample: vfio mdev display devices.

On Thu, Apr 26, 2018 at 03:44:15AM +0000, Tian, Kevin wrote: > > From: Alex Williamson > > Sent: Thursday, April 19, 2018 2:32 AM > > > > That almost begins to look reasonable, but then we can only expose this > > for mdev devices, what if we were to hack a back door into a directly > > assigned GPU that tracks the location of active display in the > > framebuffer and implement the GFX_PLANE interface for that? We have no > > sysfs representation for either the template or the actual device for > > anything other than mdev. This inconsistency with physically assigned > > devices has been one of my arguments against enhancing mdev sysfs. > > One possible option is to wrap directly assigned GPU into a mdev. The > parent driver could be a dummy PCI driver which does basic PCI > initialization, and then provide hooks for vendor-specific hack. Thowing amdgpu into the mix. Looks they have vgpu support too, but using sriov instead of mdev. Having VFIO_GFX support surely looks useful there. Adding a mdev dependency to the VFIO_GFX api would makes things more complicated there for (IMHO) no good reason ...