diff --git a/src/qemu/qemu_hostdev.c b/src/qemu/qemu_hostdev.c
index b98fd8f5df8ae4b87fd7ef75b6e26b9caa134d71..b649ae0872359223ce9d306a398ae9c64ce93497 100644
--- a/src/qemu/qemu_hostdev.c
+++ b/src/qemu/qemu_hostdev.c
@@ -565,13 +565,53 @@ qemuPrepareHostPCIDevices(struct qemud_driver *driver,
 int
 qemuPrepareHostdevUSBDevices(struct qemud_driver *driver,
                              const char *name,
-                             virDomainHostdevDefPtr *hostdevs,
-                             int nhostdevs)
+                             usbDeviceList *list)
 {
-    int ret = -1;
     int i;
+    unsigned int count;
+    usbDevice *tmp;
+
+    count = usbDeviceListCount(list);
+
+    for (i = 0; i < count; i++) {
+        usbDevice *usb = usbDeviceListGet(list, i);
+        if ((tmp = usbDeviceListFind(driver->activeUsbHostdevs, usb))) {
+            const char *other_name = usbDeviceGetUsedBy(tmp);
+
+            if (other_name)
+                qemuReportError(VIR_ERR_OPERATION_INVALID,
+                                _("USB device %s is in use by domain %s"),
+                                usbDeviceGetName(tmp), other_name);
+            else
+                qemuReportError(VIR_ERR_OPERATION_INVALID,
+                                _("USB device %s is already in use"),
+                                usbDeviceGetName(tmp));
+            return -1;
+        }
+
+        usbDeviceSetUsedBy(usb, name);
+        VIR_DEBUG("Adding %03d.%03d dom=%s to activeUsbHostdevs",
+                  usbDeviceGetBus(usb), usbDeviceGetDevno(usb), name);
+        /*
+         * The caller is responsible to steal these usb devices
+         * from the usbDeviceList that passed in on success,
+         * perform rollback on failure.
+         */
+        if (usbDeviceListAdd(driver->activeUsbHostdevs, usb) < 0)
+            return -1;
+    }
+    return 0;
+}
+
+static int
+qemuPrepareHostUSBDevices(struct qemud_driver *driver,
+                          virDomainDefPtr def)
+{
+    int i, ret = -1;
     usbDeviceList *list;
     usbDevice *tmp;
+    virDomainHostdevDefPtr *hostdevs = def->hostdevs;
+    int nhostdevs = def->nhostdevs;
 
     /* To prevent situation where USB device is assigned to two domains
      * we need to keep a list of currently assigned USB devices.
@@ -586,70 +626,61 @@ qemuPrepareHostdevUSBDevices(struct qemud_driver *driver,
      */
     for (i = 0 ; i < nhostdevs ; i++) {
         virDomainHostdevDefPtr hostdev = hostdevs[i];
+        usbDevice *usb = NULL;
 
         if (hostdev->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS)
             continue;
         if (hostdev->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB)
             continue;
 
-        /* Resolve a vendor/product to bus/device */
-        if (hostdev->source.subsys.u.usb.vendor) {
-            usbDevice *usb;
-            usbDeviceList *devs;
+        unsigned vendor = hostdev->source.subsys.u.usb.vendor;
+        unsigned product = hostdev->source.subsys.u.usb.product;
+        unsigned bus = hostdev->source.subsys.u.usb.bus;
+        unsigned device = hostdev->source.subsys.u.usb.device;
 
-            devs = usbFindDeviceByVendor(hostdev->source.subsys.u.usb.vendor,
-                                         hostdev->source.subsys.u.usb.product);
+        if (vendor && bus) {
+            usb = usbFindDevice(vendor, product, bus, device);
 
+        } else if (vendor && !bus) {
+            usbDeviceList *devs = usbFindDeviceByVendor(vendor, product);
             if (!devs)
                 goto cleanup;
 
+            if (usbDeviceListCount(devs) > 1) {
+                qemuReportError(VIR_ERR_OPERATION_FAILED,
+                                _("multiple USB devices for %x:%x, "
+                                  "use <address> to specify one"), vendor, product);
+                usbDeviceListFree(devs);
+                goto cleanup;
+            }
             usb = usbDeviceListGet(devs, 0);
             usbDeviceListSteal(devs, usb);
             usbDeviceListFree(devs);
 
-            if ((tmp = usbDeviceListFind(driver->activeUsbHostdevs, usb))) {
-                const char *other_name = usbDeviceGetUsedBy(tmp);
-
-                if (other_name)
-                    qemuReportError(VIR_ERR_OPERATION_INVALID,
-                                    _("USB device %s is in use by domain %s"),
-                                    usbDeviceGetName(tmp), other_name);
-                else
-                    qemuReportError(VIR_ERR_OPERATION_INVALID,
-                                    _("USB device %s is already in use"),
-                                    usbDeviceGetName(tmp));
-                usbFreeDevice(usb);
-                goto cleanup;
-            }
-
             hostdev->source.subsys.u.usb.bus = usbDeviceGetBus(usb);
             hostdev->source.subsys.u.usb.device = usbDeviceGetDevno(usb);
 
-            if (usbDeviceListAdd(list, usb) < 0) {
-                usbFreeDevice(usb);
-                goto cleanup;
-            }
+        } else if (!vendor && bus) {
+            usb = usbFindDeviceByBus(bus, device);
+        }
+
+        if (!usb)
+            goto cleanup;
 
+        if (usbDeviceListAdd(list, usb) < 0) {
+            usbFreeDevice(usb);
+            goto cleanup;
         }
     }
 
-    /* Loop 2: Mark devices in temporary list as used by @name
+    /* Mark devices in temporary list as used by @name
      * and add them do driver list. However, if something goes
      * wrong, perform rollback.
      */
-    for (i = 0; i < usbDeviceListCount(list); i++) {
-        tmp = usbDeviceListGet(list, i);
-        usbDeviceSetUsedBy(tmp, name);
-
-        VIR_DEBUG("Adding %03d.%03d dom=%s to activeUsbHostdevs",
-                  usbDeviceGetBus(tmp), usbDeviceGetDevno(tmp), name);
-        if (usbDeviceListAdd(driver->activeUsbHostdevs, tmp) < 0) {
-            usbFreeDevice(tmp);
-            goto inactivedevs;
-        }
-    }
+    if (qemuPrepareHostdevUSBDevices(driver, def->name, list) < 0)
+        goto inactivedevs;
 
-    /* Loop 3: Temporary list was successfully merged with
+    /* Loop 2: Temporary list was successfully merged with
      * driver list, so steal all items to avoid freeing them
      * in cleanup label.
      */
@@ -675,13 +706,6 @@ cleanup:
     return ret;
 }
 
-static int
-qemuPrepareHostUSBDevices(struct qemud_driver *driver,
-                          virDomainDefPtr def)
-{
-    return qemuPrepareHostdevUSBDevices(driver, def->name, def->hostdevs, def->nhostdevs);
-}
-
 int qemuPrepareHostDevices(struct qemud_driver *driver,
                            virDomainDefPtr def)
 {
diff --git a/src/qemu/qemu_hostdev.h b/src/qemu/qemu_hostdev.h
index 371630ab365d1f841c1c06e03f1d1260dc94d81b..a8acccf45b5e5b3db595b43e6ef6e68ebba2eb32 100644
--- a/src/qemu/qemu_hostdev.h
+++ b/src/qemu/qemu_hostdev.h
@@ -38,8 +38,7 @@ int qemuPrepareHostdevPCIDevices(struct qemud_driver *driver,
                                  int nhostdevs);
 int qemuPrepareHostdevUSBDevices(struct qemud_driver *driver,
                                  const char *name,
-                                 virDomainHostdevDefPtr *hostdevs,
-                                 int nhostdevs);
+                                 usbDeviceList *list);
 int qemuPrepareHostDevices(struct qemud_driver *driver,
                            virDomainDefPtr def);
 void qemuReattachPciDevice(pciDevice *dev, struct qemud_driver *driver);
diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index 0f5fed1bcac7b8d7441dd7ab7eac397c11cfca40..ad31eba63093dd63754729be54a064050786b5f4 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -1116,11 +1116,13 @@ error:
     return -1;
 }
 
-
 int qemuDomainAttachHostDevice(struct qemud_driver *driver,
                                virDomainObjPtr vm,
                                virDomainHostdevDefPtr hostdev)
 {
+    usbDeviceList *list;
+    usbDevice *usb = NULL;
+
     if (hostdev->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS) {
         qemuReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                         _("hostdev mode '%s' not supported"),
@@ -1128,35 +1130,58 @@ int qemuDomainAttachHostDevice(struct qemud_driver *driver,
         return -1;
     }
 
-    /* Resolve USB product/vendor to bus/device */
-    if (hostdev->source.subsys.type == VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB &&
-        hostdev->source.subsys.u.usb.vendor) {
-        usbDevice *usb;
-        usbDeviceList *list;
+    if (!(list = usbDeviceListNew()))
+        goto cleanup;
 
-        if (qemuPrepareHostdevUSBDevices(driver, vm->def->name, &hostdev, 1) < 0)
-            goto error;
+    if (hostdev->source.subsys.type == VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB) {
+        unsigned vendor = hostdev->source.subsys.u.usb.vendor;
+        unsigned product = hostdev->source.subsys.u.usb.product;
+        unsigned bus = hostdev->source.subsys.u.usb.bus;
+        unsigned device = hostdev->source.subsys.u.usb.device;
 
-        list = usbFindDeviceByVendor(hostdev->source.subsys.u.usb.vendor,
-                                     hostdev->source.subsys.u.usb.product);
+        if (vendor && bus) {
+            usb = usbFindDevice(vendor, product, bus, device);
 
-        if (!list)
-            return -1;
+        } else if (vendor && !bus) {
+            usbDeviceList *devs = usbFindDeviceByVendor(vendor, product);
+            if (!devs)
+                goto cleanup;
 
-        usb = usbDeviceListGet(list, 0);
-        usbDeviceListSteal(list, usb);
-        usbDeviceListFree(list);
+            if (usbDeviceListCount(devs) > 1) {
+                qemuReportError(VIR_ERR_OPERATION_FAILED,
+                                _("multiple USB devices for %x:%x, "
+                                  "use <address> to specify one"), vendor, product);
+                usbDeviceListFree(devs);
+                goto cleanup;
+            }
+            usb = usbDeviceListGet(devs, 0);
+            usbDeviceListSteal(devs, usb);
+            usbDeviceListFree(devs);
 
-        hostdev->source.subsys.u.usb.bus = usbDeviceGetBus(usb);
-        hostdev->source.subsys.u.usb.device = usbDeviceGetDevno(usb);
+            hostdev->source.subsys.u.usb.bus = usbDeviceGetBus(usb);
+            hostdev->source.subsys.u.usb.device = usbDeviceGetDevno(usb);
 
-        usbFreeDevice(usb);
-    }
+        } else if (!vendor && bus) {
+            usb = usbFindDeviceByBus(bus, device);
+        }
 
+        if (!usb)
+            goto cleanup;
+
+        if (usbDeviceListAdd(list, usb) < 0) {
+            usbFreeDevice(usb);
+            goto cleanup;
+        }
+
+        if (qemuPrepareHostdevUSBDevices(driver, vm->def->name, list) < 0)
+            goto cleanup;
+
+        usbDeviceListSteal(list, usb);
+    }
 
     if (virSecurityManagerSetHostdevLabel(driver->securityManager,
                                           vm->def, hostdev) < 0)
-        return -1;
+        goto cleanup;
 
     switch (hostdev->source.subsys.type) {
     case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI:
@@ -1178,6 +1203,7 @@ int qemuDomainAttachHostDevice(struct qemud_driver *driver,
         goto error;
     }
 
+    usbDeviceListFree(list);
     return 0;
 
 error:
@@ -1185,6 +1211,9 @@ error:
                                               vm->def, hostdev) < 0)
         VIR_WARN("Unable to restore host device labelling on hotplug fail");
 
+cleanup:
+    usbDeviceListFree(list);
+    usbDeviceListSteal(driver->activeUsbHostdevs, usb);
     return -1;
 }