--- a/tools/qemu-xen-traditional-dir-remote/hw/pass-through.c	2012-06-18 01:31:17.000000000 +0200
+++ b/tools/qemu-xen-traditional-dir-remote/hw/pass-through.c	2012-06-18 01:26:41.000000000 +0200
@@ -3285,6 +3285,8 @@ static int pt_cmd_reg_read(struct pt_dev
 }
 
 /* read BAR */
+static int gfx_first_read_BAR[7] = {1, 1, 1, 1, 1, 1, 1};
+
 static int pt_bar_reg_read(struct pt_dev *ptdev,
         struct pt_reg_tbl *cfg_entry,
         uint32_t *value, uint32_t valid_mask)
@@ -3307,6 +3309,17 @@ static int pt_bar_reg_read(struct pt_dev
     /* use fixed-up value from kernel sysfs */
     *value = ptdev->pci_dev->base_addr[index];
 
+    if ( ptdev->pci_dev->device_class == 0x300 )
+    {
+        if ( gfx_first_read_BAR[index] == 1 )
+        {
+            gfx_first_read_BAR[index] = 0;
+            PT_LOG("first read BARs of gfx\n");
+            return 0;
+        }
+    }
+
+
     /* set emulate mask depend on BAR flag */
     switch (ptdev->bases[index].bar_flag)
     {