drm/i915/gvt: filter cmd "pipe-ctrl" in cmd_handler

"pipe-ctrl" is still a TODO. allow it here.

Cc: Colin Xu <colin.xu@intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20201223034526.17128-1-yan.y.zhao@intel.comReviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>

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

@@ -999,6 +999,11 @@ static int cmd_reg_handler(struct parser_exec_state *s,
 		return -EPERM;
 	}
 
+	if (!strncmp(cmd, "pipe_ctrl", 9)) {
+		/* TODO: add LRI POST logic here */
+		return 0;
+	}
+
 	if (is_cmd_update_pdps(offset, s) &&
 	    cmd_pdp_mmio_update_handler(s, offset, index))
 		return -EINVAL;