vga: fix region checks in wraparound case

Cc: "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: 20171030102830.4469-1-kraxel@redhat.com
qemu · Nov 10, 2017 · 115788d · 115788d
1 parent c53f5b8
commit 115788d
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/hw/display/vga.c b/hw/display/vga.c
@@ -1666,9 +1666,9 @@ static void vga_draw_graphic(VGACommonState *s, int full_update)
             /* scanline wraps from end of video memory to the start */
             assert(force_shadow);
             update = memory_region_snapshot_get_dirty(&s->vram, snap,
-                                                      page0, 0);
+                                                      page0, s->vbe_size - page0);
             update |= memory_region_snapshot_get_dirty(&s->vram, snap,
-                                                       page1, 0);
+                                                       0, page1);
         } else {
             update = memory_region_snapshot_get_dirty(&s->vram, snap,
                                                       page0, page1 - page0);