From: Jean Guyader <jean.guyader@eu.citrix.com>
Date: Fri, 27 Mar 2009 10:46:03 +0000 (+0000)
Subject: Graphic pass-through: Force the register 0xfc (opregion address) to be 0.
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=5538069420865b6322e6c43bfe883e602c277739;p=xenclient%2Fioemu.git

Graphic pass-through: Force the register 0xfc (opregion address) to be 0.
---

diff --git a/hw/pci.c b/hw/pci.c
index 89c17aca..69fcb2e0 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -493,11 +493,14 @@ uint32_t pci_data_read(void *opaque, uint32_t addr, int len)
 		val = pt_pci_host_read_long(0, 0, 0, 0x00);
 	}
     }
+    else if (vga_passthrough && pci_dev->devfn == 0x10 && // intel graphic card
+	    config_addr == 0xfc) // OpRegion address
+	val = 0; // force to fall back to SMI mode
     else
         val = pci_dev->config_read(pci_dev, config_addr, len);
 #if defined(DEBUG_PCI)
-    printf("pci_config_read: %s: addr=%02x val=%08x len=%d\n",
-           pci_dev->name, config_addr, val, len);
+    printf("pci_config_read: %s(0x%x): addr=%02x val=%08x len=%d\n",
+           pci_dev->name, pci_dev->devfn, config_addr, val, len);
 #endif
  the_end:
 #if defined(DEBUG_PCI) && 0