drm/i915/gvt: Return error at the failure of finding page_track

In XenGT, ioreq copy is used to trap mmio write and ppgtt write. Both
of them are memory write, ioreq handler couldn't distinguish them. So
ioreq handler probe the ppgtt write handler, if it is succuess, this
ioreq is ppgtt write, otherwise it is mmio write.

So ppgtt write handler should return an error at the failure of finding
page track, it is fatal to implement ioreq handler in XenGT.
Signed-off-by: NXiong Zhang <xiong.y.zhang@intel.com>
Signed-off-by: NZhenyu Wang <zhenyuw@linux.intel.com>

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

@@ -164,8 +164,10 @@ int intel_vgpu_page_track_handler(struct intel_vgpu *vgpu, u64 gpa,
 	mutex_lock(&gvt->lock);
 
 	page_track = intel_vgpu_find_page_track(vgpu, gpa >> PAGE_SHIFT);
-	if (!page_track)
+	if (!page_track) {
+		ret = -ENXIO;
 		goto out;
+	}
 
 	if (unlikely(vgpu->failsafe)) {
 		/* Remove write protection to prevent furture traps. */