Index: xen-4.0.0-testing/tools/ioemu-remote/hw/xen_platform.c
===================================================================
--- xen-4.0.0-testing.orig/tools/ioemu-remote/hw/xen_platform.c	2010-02-18 14:08:08.000000000 -0700
+++ xen-4.0.0-testing/tools/ioemu-remote/hw/xen_platform.c	2010-02-18 14:28:59.000000000 -0700
@@ -359,6 +359,8 @@ static void platform_ioport_write(void *
     case 4:
         fprintf(logfile, "Disconnect IDE hard disk...\n");
         ide_unplug_harddisks();
+        fprintf(logfile, "Disconnect SCSI hard disk...\n");
+        pci_unplug_scsi();
         fprintf(logfile, "Disconnect netifs...\n");
         pci_unplug_netifs();
         fprintf(logfile, "Shutdown taps...\n");
Index: xen-4.0.0-testing/tools/ioemu-remote/qemu-xen.h
===================================================================
--- xen-4.0.0-testing.orig/tools/ioemu-remote/qemu-xen.h	2010-02-18 14:08:08.000000000 -0700
+++ xen-4.0.0-testing/tools/ioemu-remote/qemu-xen.h	2010-02-18 14:44:28.000000000 -0700
@@ -57,6 +57,7 @@ void unset_vram_mapping(void *opaque);
 #endif
 
 void pci_unplug_netifs(void);
+void pci_unplug_scsi(void);
 void destroy_hvm_domain(void);
 void unregister_iomem(target_phys_addr_t start);
 
Index: xen-4.0.0-testing/tools/ioemu-remote/hw/pci.c
===================================================================
--- xen-4.0.0-testing.orig/tools/ioemu-remote/hw/pci.c	2010-02-18 14:49:36.000000000 -0700
+++ xen-4.0.0-testing/tools/ioemu-remote/hw/pci.c	2010-02-18 14:53:47.000000000 -0700
@@ -892,6 +892,50 @@ void pci_unplug_netifs(void)
     }
 }
 
+void pci_unplug_scsi(void)
+{
+    PCIBus *bus;
+    PCIDevice *dev;
+    PCIIORegion *region;
+    int x;
+    int i;
+
+    /* We only support one PCI bus */
+    for (bus = first_bus; bus; bus = NULL) {
+       for (x = 0; x < 256; x++) {
+           dev = bus->devices[x];
+           if (dev &&
+               dev->config[0xa] == 0 &&
+               dev->config[0xb] == 1 
+#ifdef CONFIG_PASSTHROUGH
+               && test_pci_devfn(x) != 1
+#endif
+               ) {
+               /* Found a scsi disk.  Remove it from the bus.  Note that
+                  we don't free it here, since there could still be
+                  references to it floating around.  There are only
+                  ever one or two structures leaked, and it's not
+                  worth finding them all. */
+               bus->devices[x] = NULL;
+               for (i = 0; i < PCI_NUM_REGIONS; i++) {
+                   region = &dev->io_regions[i];
+                   if (region->addr == (uint32_t)-1 ||
+                       region->size == 0)
+                       continue;
+                   fprintf(logfile, "region type %d at [%x,%x).\n",
+                           region->type, region->addr,
+                           region->addr+region->size);
+                   if (region->type == PCI_ADDRESS_SPACE_IO) {
+                       isa_unassign_ioport(region->addr, region->size);
+                   } else if (region->type == PCI_ADDRESS_SPACE_MEM) {
+                       unregister_iomem(region->addr);
+                   }
+               }
+           }
+       }
+    }
+}
+
 typedef struct {
     PCIDevice dev;
     PCIBus *bus;