[Xen-devel] [PATCH 2/2] xen:i386:pc_piix: create isa bridge specific to IGD passthrough

[Tiejun Chen <tiejun.chen@xxxxxxxxx>]

Currenjly this ISA bridge should be fixed at 1f.0, and pass the
real vendor/device ids as the driver expect.

Signed-off-by: Tiejun Chen <tiejun.chen@xxxxxxxxx>
---
 hw/i386/pc_piix.c | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 7710724..b131fa3 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -50,7 +50,8 @@
 #include "cpu.h"
 #include "qemu/error-report.h"
 #ifdef CONFIG_XEN
-#  include <xen/hvm/hvm_info_table.h>
+#include <xen/hvm/hvm_info_table.h>
+#include <hw/xen/xen-host-pci-device.h>
 #endif
 
 #define MAX_IDE_BUS 2
@@ -463,6 +464,26 @@ static void pc_xen_hvm_init(MachineState *machine)
     }
 }
 
+static void xen_igd_passthrough_isa_bridge_create(PCIBus *bus)
+{
+    struct PCIDevice *dev;
+    XenHostPCIDevice hdev;
+    int r = 0;
+
+    /* This shoudl be fixed at 1f.0 then pass vendor/device ids.
+     */
+    dev = pci_create_simple(bus, PCI_DEVFN(0x1f, 0),
+                            "xen-igd-passthrough-isa-bridge");
+    if (dev) {
+        r = xen_host_pci_device_get(&hdev, 0, 0, PCI_DEVFN(0x1f, 0), 0);
+        if (!r) {
+            pci_config_set_vendor_id(dev->config, hdev.vendor_id);
+            pci_config_set_device_id(dev->config, hdev.device_id);
+        } else
+            fprintf(stderr, "xen set xen-igd-passthrough-isa-bridge failed\n");
+    }
+}
+
 static void xen_igd_passthrough_pc_hvm_init(MachineState *machine)
 {
     PCIBus *bus;
@@ -472,6 +493,7 @@ static void xen_igd_passthrough_pc_hvm_init(MachineState 
*machine)
     bus = pci_find_primary_bus();
     if (bus != NULL) {
         pci_create_simple(bus, -1, "xen-platform");
+        xen_igd_passthrough_isa_bridge_create(bus);
     }
 }
 #endif
-- 
1.9.1


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