Merge tag 'gvt-fixes-2017-03-23' of https://github.com/01org/gvt-linux into drm-intel-fixes

gvt-fixes-2017-03-23

- KVM reference fix from Alex
- shadow gtt entry partial update fix from Xiaoguang
- gvt context notification check (Changbin)
- other misc fixes.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>