The vfio-mdev provide the capability to let different guest share the same physical device through mediate sharing, as result it bring a requirement about how to control the device sharing, we need a QoS related interface for mdev to management virtual device resource. E.g. In practical use, vGPUs assigned to different quests almost has different performance requirements, some guests may need higher priority for real time usage, some other may need more portion of the GPU resource to get higher 3D performance, corresponding we can define some interfaces like weight/cap for overall budget control, priority for single submission control. So I suggest to add some common attributes which are vendor agnostic in mdev core sysfs for QoS purpose. -Ping
