qxl: fix qxl_set_dirty call in qxl_dirty_one_surface

qxl_set_dirty() expects start and end as range specification.
qxl_dirty_one_surface passes 'size' instead of 'offset + size' as end
parameter.  Fix that.  Also use uint64_t everywhere while being at it.

Bug was added by "e25139b qxl: set only off-screen surfaces dirty instead
of the whole vram" and carried forward unnoticed by "5cdc402 qxl: fix
surface migration".

Reported-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-id: 1468413187-22071-1-git-send-email-kraxel@redhat.com
diff --git a/hw/display/qxl.c b/hw/display/qxl.c
index 46cc866..0e2682d 100644
--- a/hw/display/qxl.c
+++ b/hw/display/qxl.c
@@ -1816,16 +1816,17 @@
 static void qxl_dirty_one_surface(PCIQXLDevice *qxl, QXLPHYSICAL pqxl,
                                   uint32_t height, int32_t stride)
 {
-    uint64_t offset;
-    uint32_t slot, size;
+    uint64_t offset, size;
+    uint32_t slot;
     bool rc;
 
     rc = qxl_get_check_slot_offset(qxl, pqxl, &slot, &offset);
     assert(rc == true);
-    size = height * abs(stride);
-    trace_qxl_surfaces_dirty(qxl->id, (int)offset, size);
+    size = (uint64_t)height * abs(stride);
+    trace_qxl_surfaces_dirty(qxl->id, offset, size);
     qxl_set_dirty(qxl->guest_slots[slot].mr,
-                  qxl->guest_slots[slot].offset + offset, size);
+                  qxl->guest_slots[slot].offset + offset,
+                  qxl->guest_slots[slot].offset + offset + size);
 }
 
 static void qxl_dirty_surfaces(PCIQXLDevice *qxl)