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-rw-r--r--hw/vfio/display.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/hw/vfio/display.c b/hw/vfio/display.c
index 276fba090d..212ad1674e 100644
--- a/hw/vfio/display.c
+++ b/hw/vfio/display.c
@@ -45,8 +45,8 @@ static void vfio_display_edid_update(VFIOPCIDevice *vdev, bool enabled,
     qemu_edid_info edid = {
         .maxx  = dpy->edid_regs->max_xres,
         .maxy  = dpy->edid_regs->max_yres,
-        .prefx = prefx,
-        .prefy = prefy,
+        .prefx = prefx ?: vdev->display_xres,
+        .prefy = prefy ?: vdev->display_yres,
     };
 
     dpy->edid_regs->link_state = VFIO_DEVICE_GFX_LINK_STATE_DOWN;
@@ -142,6 +142,14 @@ static void vfio_display_edid_init(VFIOPCIDevice *vdev)
 
     dpy->edid_blob = g_malloc0(dpy->edid_regs->edid_max_size);
 
+    /* if xres + yres properties are unset use the maximum resolution */
+    if (!vdev->display_xres) {
+        vdev->display_xres = dpy->edid_regs->max_xres;
+    }
+    if (!vdev->display_yres) {
+        vdev->display_yres = dpy->edid_regs->max_yres;
+    }
+
     vfio_display_edid_update(vdev, true, 0, 0);
     return;