qemu-xen: pass-through: always use hw intx

pass-through: always use hw intx and always get it from the same place

Cc: Tom Rotenberg <tom.rotenberg@xxxxxxxxx>
Cc: Edwin Zhai <edwin.zhai@xxxxxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>

Index: ioemu-remote/hw/pass-through.c
===================================================================
--- ioemu-remote.orig/hw/pass-through.c	2009-12-31 13:10:06.000000000 +0900
+++ ioemu-remote/hw/pass-through.c	2009-12-31 13:24:20.000000000 +0900
@@ -2710,7 +2710,7 @@ static uint32_t pt_status_reg_init(struc
 static uint32_t pt_irqpin_reg_init(struct pt_dev *ptdev,
         struct pt_reg_info_tbl *reg, uint32_t real_offset)
 {
-    return ptdev->dev.config[real_offset];
+    return pci_read_intx(ptdev);
 }
 
 /* initialize BAR */
@@ -4471,6 +4471,11 @@ int pt_init(PCIBus *e_bus)
     return 0;
 }
 
+static uint8_t pci_read_intx(struct pt_dev *ptdev)
+{
+    return pci_read_byte(ptdev->pci_dev, PCI_INTERRUPT_PIN);
+}
+
 /* The PCI Local Bus Specification, Rev. 3.0,
  * Section 6.2.4 Miscellaneous Registers, pp 223
  * outlines 5 valid values for the intertupt pin (intx).
@@ -4499,9 +4504,9 @@ int pt_init(PCIBus *e_bus)
  * 4               | 3   | INTD#
  * any other value | 0   | This should never happen, log error message
  */
-static uint8_t pci_read_intx(struct pt_dev *ptdev)
+uint8_t pci_intx(struct pt_dev *ptdev)
 {
-    uint8_t r_val = pci_read_byte(ptdev->pci_dev, PCI_INTERRUPT_PIN);
+    uint8_t r_val = pci_read_intx(ptdev);
 
     PT_LOG("intx=%i\n", r_val);
     if (r_val < 1 || r_val > 4)
@@ -4517,14 +4522,3 @@ static uint8_t pci_read_intx(struct pt_d
 
     return r_val;
 }
-
-/*
- * For virtual function 0, always use INTA#,
- * otherwise use the hardware value
- */
-uint8_t pci_intx(struct pt_dev *ptdev)
-{
-    if (!PCI_FUNC(ptdev->dev.devfn))
-        return 0;
-    return pci_read_intx(ptdev);
-}