On Mon, Oct 12, 2020 at 08:38:54AM +0000, Tian, Kevin wrote: > > From: Jason Wang <jasowang@xxxxxxxxxx> > > Jason suggest something like /dev/sva. There will be a lot of other > > subsystems that could benefit from this (e.g vDPA). Honestly, I fail to see the benefit of offloading these IOMMU specific setup tasks to user-space. The ways PASID and the device partitioning it allows are used are very device specific. A GPU will be partitioned completly different than a network card. So the device drivers should use the (v)SVA APIs to setup the partitioning in a way which makes sense for the device. And VFIO is of course a user by itself, as it allows assigning device partitions to guests. Or even allow assigning complete devices and allow the guests to partition it themselfes. So having said this, what is the benefit of exposing those SVA internals to user-space? Regards, Joerg
