libxl: support creating guest with USB hostdev

Support creating guest with USB host device in config file.
Currently libxl only supports xen PV guest, and only supports
specifying USB host device by 'bus number' and 'device number',
for example:

    <hostdev mode='subsystem' type='usb' managed='no'>
      <source>
        <address bus='1' device='3'/>
      </source>
    </hostdev>

Signed-off-by: Chunyan Liu <cyliu@suse.com>
Signed-off-by: Jim Fehlig <jfehlig@suse.com>

src/libxl/libxl_conf.c

@@ -1514,6 +1514,75 @@ int libxlDriverConfigLoadFile(libxlDriverConfigPtr cfg,
 
 }
 
+#ifdef LIBXL_HAVE_PVUSB
+int
+libxlMakeUSB(virDomainHostdevDefPtr hostdev, libxl_device_usbdev *usbdev)
+{
+    virDomainHostdevSubsysUSBPtr usbsrc = &hostdev->source.subsys.u.usb;
+
+    if (hostdev->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS)
+        return -1;
+    if (hostdev->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB)
+        return -1;
+
+    if (usbsrc->bus <= 0 || usbsrc->device <= 0) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                       _("libxenlight supports only USB device "
+                         "specified by busnum:devnum"));
+        return -1;
+    }
+
+    usbdev->u.hostdev.hostbus = usbsrc->bus;
+    usbdev->u.hostdev.hostaddr = usbsrc->device;
+
+    return 0;
+}
+
+static int
+libxlMakeUSBList(virDomainDefPtr def, libxl_domain_config *d_config)
+{
+    virDomainHostdevDefPtr *l_hostdevs = def->hostdevs;
+    size_t nhostdevs = def->nhostdevs;
+    size_t nusbdevs = 0;
+    libxl_device_usbdev *x_usbdevs;
+    size_t i, j;
+
+    if (nhostdevs == 0)
+        return 0;
+
+    if (VIR_ALLOC_N(x_usbdevs, nhostdevs) < 0)
+        return -1;
+
+    for (i = 0, j = 0; i < nhostdevs; i++) {
+        if (l_hostdevs[i]->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS)
+            continue;
+        if (l_hostdevs[i]->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB)
+            continue;
+
+        libxl_device_usbdev_init(&x_usbdevs[j]);
+
+        if (libxlMakeUSB(l_hostdevs[i], &x_usbdevs[j]) < 0)
+            goto error;
+
+        nusbdevs++;
+        j++;
+    }
+
+    VIR_SHRINK_N(x_usbdevs, nhostdevs, nhostdevs - nusbdevs);
+    d_config->usbdevs = x_usbdevs;
+    d_config->num_usbdevs = nusbdevs;
+
+    return 0;
+
+ error:
+    for (i = 0; i < nusbdevs; i++)
+        libxl_device_usbdev_dispose(&x_usbdevs[i]);
+
+    VIR_FREE(x_usbdevs);
+    return -1;
+}
+#endif
+
 int
 libxlMakePCI(virDomainHostdevDefPtr hostdev, libxl_device_pci *pcidev)
 {
@@ -1717,6 +1786,11 @@ libxlBuildDomainConfig(virPortAllocatorPtr graphicsports,
     if (libxlMakePCIList(def, d_config) < 0)
         return -1;
 
+#ifdef LIBXL_HAVE_PVUSB
+    if (libxlMakeUSBList(def, d_config) < 0)
+        return -1;
+#endif
+
     /*
      * Now that any potential VFBs are defined, update the build info with
      * the data of the primary display. Some day libxl might implicitely do

src/libxl/libxl_conf.h

@@ -184,6 +184,11 @@ libxlMakeVfb(virPortAllocatorPtr graphicsports,
 int
 libxlMakePCI(virDomainHostdevDefPtr hostdev, libxl_device_pci *pcidev);
 
+# ifdef LIBXL_HAVE_PVUSB
+int
+libxlMakeUSB(virDomainHostdevDefPtr hostdev, libxl_device_usbdev *usbdev);
+# endif
+
 virDomainXMLOptionPtr
 libxlCreateXMLConf(void);
 

src/libxl/libxl_domain.c

@@ -731,9 +731,14 @@ libxlDomainCleanup(libxlDriverPrivatePtr driver,
     int vnc_port;
     char *file;
     virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
+    unsigned int hostdev_flags = VIR_HOSTDEV_SP_PCI;
+
+#ifdef LIBXL_HAVE_PVUSB
+    hostdev_flags |= VIR_HOSTDEV_SP_USB;
+#endif
 
     virHostdevReAttachDomainDevices(hostdev_mgr, LIBXL_DRIVER_NAME,
-                                    vm->def, VIR_HOSTDEV_SP_PCI, NULL);
+                                    vm->def, hostdev_flags, NULL);
 
     VIR_FREE(priv->lockState);
     if (virDomainLockProcessPause(driver->lockManager, vm, &priv->lockState) < 0)
@@ -1043,6 +1048,11 @@ libxlDomainStart(libxlDriverPrivatePtr driver,
     virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
     libxl_asyncprogress_how aop_console_how;
     libxl_domain_restore_params params;
+    unsigned int hostdev_flags = VIR_HOSTDEV_SP_PCI;
+
+#ifdef LIBXL_HAVE_PVUSB
+    hostdev_flags |= VIR_HOSTDEV_SP_USB;
+#endif
 
     libxl_domain_config_init(&d_config);
 
@@ -1118,7 +1128,7 @@ libxlDomainStart(libxlDriverPrivatePtr driver,
         goto cleanup_dom;
 
     if (virHostdevPrepareDomainDevices(hostdev_mgr, LIBXL_DRIVER_NAME,
-                                       vm->def, VIR_HOSTDEV_SP_PCI) < 0)
+                                       vm->def, hostdev_flags) < 0)
         goto cleanup_dom;
 
     /* Unlock virDomainObj while creating the domain */

src/libxl/libxl_driver.c

@@ -351,6 +351,11 @@ libxlReconnectDomain(virDomainObjPtr vm,
     int len;
     uint8_t *data = NULL;
     virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
+    unsigned int hostdev_flags = VIR_HOSTDEV_SP_PCI;
+
+#ifdef LIBXL_HAVE_PVUSB
+    hostdev_flags |= VIR_HOSTDEV_SP_USB;
+#endif
 
     virObjectLock(vm);
 
@@ -378,7 +383,7 @@ libxlReconnectDomain(virDomainObjPtr vm,
 
     /* Update hostdev state */
     if (virHostdevUpdateActiveDomainDevices(hostdev_mgr, LIBXL_DRIVER_NAME,
-                                            vm->def, VIR_HOSTDEV_SP_PCI) < 0)
+                                            vm->def, hostdev_flags) < 0)
         goto out;
 
     if (virAtomicIntInc(&driver->nactive) == 1 && driver->inhibitCallback)