drm/i915/gvt: Update save/restore list to compatible KBL platform.

Add some KBL specially registers to save/restore list.
Signed-off-by: NXu Han <xu.han@intel.com>
Signed-off-by: NZhenyu Wang <zhenyuw@linux.intel.com>

drivers/gpu/drm/i915/gvt/render.c

@@ -126,6 +126,18 @@ static struct render_mmio gen9_render_mmio_list[] = {
 	{VCS2, _MMIO(0x1c028), 0xffff, false},
 
 	{VECS, _MMIO(0x1a028), 0xffff, false},
+
+	{RCS, _MMIO(0x7304), 0xffff, true},
+	{RCS, _MMIO(0x2248), 0x0, false},
+	{RCS, _MMIO(0x940c), 0x0, false},
+	{RCS, _MMIO(0x4ab8), 0x0, false},
+
+	{RCS, _MMIO(0x4ab0), 0x0, false},
+	{RCS, _MMIO(0x20d4), 0x0, false},
+
+	{RCS, _MMIO(0xb004), 0x0, false},
+	{RCS, _MMIO(0x20a0), 0x0, false},
+	{RCS, _MMIO(0x20e4), 0xffff, false},
 };
 
 static u32 gen9_render_mocs[I915_NUM_ENGINES][64];