Documentation/gpu: Add section for Intel GVT-g host support

Update with brief overview and reference for more detailed
arch design documents.

Add new section for Intel GVT-g host support.
Signed-off-by: NZhenyu Wang <zhenyuw@linux.intel.com>

Documentation/gpu/i915.rst

@@ -49,6 +49,15 @@ Intel GVT-g Guest Support(vGPU)
 .. kernel-doc:: drivers/gpu/drm/i915/i915_vgpu.c
    :internal:
 
+Intel GVT-g Host Support(vGPU device model)
+-------------------------------------------
+
+.. kernel-doc:: drivers/gpu/drm/i915/intel_gvt.c
+   :doc: Intel GVT-g host support
+
+.. kernel-doc:: drivers/gpu/drm/i915/intel_gvt.c
+   :internal:
+
 Display Hardware Handling
 =========================
 

drivers/gpu/drm/i915/intel_gvt.c

@@ -31,8 +31,12 @@
  * GPU among multiple virtual machines on a time-sharing basis. Each
  * virtual machine is presented a virtual GPU (vGPU), which has equivalent
  * features as the underlying physical GPU (pGPU), so i915 driver can run
- * seamlessly in a virtual machine. This file provides the englightments
- * of GVT and the necessary components used by GVT in i915 driver.
+ * seamlessly in a virtual machine.
+ *
+ * To virtualize GPU resources GVT-g driver depends on hypervisor technology
+ * e.g KVM/VFIO/mdev, Xen, etc. to provide resource access trapping capability
+ * and be virtualized within GVT-g device module. More architectural design
+ * doc is available on https://01.org/group/2230/documentation-list.
  */
 
 static bool is_supported_device(struct drm_i915_private *dev_priv)