[PATCH 3/3] libxl: add new pvusb backend "qusb" provided by qemu

[Juergen Gross <jgross@suse.com>]

Add a new pvusb backend type "qusb" which is provided by qemu. It can
be selected either by specifying the type directly in the configuration
or it is selected automatically by libxl in case there is no "usbback"
driver loaded.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 docs/man/xl.cfg.pod.5                |  11 +++-
 tools/libxl/libxl_device.c           |   3 +-
 tools/libxl/libxl_dm.c               |   8 +++
 tools/libxl/libxl_internal.h         |   1 +
 tools/libxl/libxl_pvusb.c            | 102 +++++++++++++++++++++++++++--------
 tools/libxl/libxl_types.idl          |   1 +
 tools/libxl/libxl_types_internal.idl |   1 +
 7 files changed, 101 insertions(+), 26 deletions(-)

diff --git a/docs/man/xl.cfg.pod.5 b/docs/man/xl.cfg.pod.5
index 1dde66b..06eeb42 100644
--- a/docs/man/xl.cfg.pod.5
+++ b/docs/man/xl.cfg.pod.5
@@ -737,8 +737,15 @@ Possible B<KEY>s are:
 
 =item B<type=TYPE>
 
-Specifies the usb controller type.  Currently only 'pv' and 'auto'
-are supported.
+Specifies the usb controller type.
+
+"pv" denotes a kernel based pvusb backend.
+
+"qusb" specifies a qemu base backend for pvusb.
+
+"auto" (the default) determines whether a kernel based backend is installed.
+If this is the case, "pv" is selected, "qusb" will be selected if no kernel
+backend is currently available.
 
 =item B<version=VERSION>
 
diff --git a/tools/libxl/libxl_device.c b/tools/libxl/libxl_device.c
index 4ced9b6..eba3087 100644
--- a/tools/libxl/libxl_device.c
+++ b/tools/libxl/libxl_device.c
@@ -680,7 +680,8 @@ void libxl__devices_destroy(libxl__egc *egc, libxl__devices_remove_state *drs)
                 aodev->action = LIBXL__DEVICE_ACTION_REMOVE;
                 aodev->dev = dev;
                 aodev->force = drs->force;
-                if (dev->backend_kind == LIBXL__DEVICE_KIND_VUSB)
+                if (dev->backend_kind == LIBXL__DEVICE_KIND_VUSB ||
+                    dev->backend_kind == LIBXL__DEVICE_KIND_QUSB)
                     libxl__initiate_device_usbctrl_remove(egc, aodev);
                 else
                     libxl__initiate_device_generic_remove(egc, aodev);
diff --git a/tools/libxl/libxl_dm.c b/tools/libxl/libxl_dm.c
index 637b11d..3793d2c 100644
--- a/tools/libxl/libxl_dm.c
+++ b/tools/libxl/libxl_dm.c
@@ -2143,6 +2143,14 @@ int libxl__need_xenpv_qemu(libxl__gc *gc, libxl_domain_config *d_config)
         }
     }
 
+    for (i = 0; i < d_config->num_usbctrls; i++) {
+       if (d_config->usbctrls[i].type == LIBXL_USBCTRL_TYPE_QUSB &&
+           d_config->usbctrls[i].backend_domid == domid) {
+            ret = 1;
+            goto out;
+        }
+    }
+
 out:
     return ret;
 }
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index fc7bdab..2db8b1b 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -487,6 +487,7 @@ typedef struct {
 #define QEMU_BACKEND(dev) (\
     (dev)->backend_kind == LIBXL__DEVICE_KIND_QDISK || \
     (dev)->backend_kind == LIBXL__DEVICE_KIND_VFB || \
+    (dev)->backend_kind == LIBXL__DEVICE_KIND_QUSB || \
     (dev)->backend_kind == LIBXL__DEVICE_KIND_VKBD)
 
 #define XC_PCI_BDF             "0x%x, 0x%x, 0x%x, 0x%x"
diff --git a/tools/libxl/libxl_pvusb.c b/tools/libxl/libxl_pvusb.c
index 256add9..d9bac3c 100644
--- a/tools/libxl/libxl_pvusb.c
+++ b/tools/libxl/libxl_pvusb.c
@@ -22,6 +22,21 @@
 
 #define USBHUB_CLASS_CODE 9
 
+static int usbback_is_loaded(libxl__gc *gc)
+{
+    int r;
+    struct stat st;
+
+    r = lstat(SYSFS_USBBACK_DRIVER, &st);
+
+    if (r == 0)
+        return 1;
+    if (r < 0 && errno == ENOENT)
+        return 0;
+    LOGE(ERROR, "Accessing %s", SYSFS_USBBACK_DRIVER);
+    return -1;
+}
+
 static int libxl__device_usbctrl_setdefault(libxl__gc *gc, uint32_t domid,
                                             libxl_device_usbctrl *usbctrl)
 {
@@ -36,7 +51,8 @@ static int libxl__device_usbctrl_setdefault(libxl__gc *gc, uint32_t domid,
 
     if (usbctrl->type == LIBXL_USBCTRL_TYPE_AUTO) {
         if (domtype == LIBXL_DOMAIN_TYPE_PV) {
-            usbctrl->type = LIBXL_USBCTRL_TYPE_PV;
+            usbctrl->type = usbback_is_loaded(gc) ? LIBXL_USBCTRL_TYPE_PV
+                                                  : LIBXL_USBCTRL_TYPE_QUSB;
         } else if (domtype == LIBXL_DOMAIN_TYPE_HVM) {
             /* FIXME: See if we can detect PV frontend */
             usbctrl->type = LIBXL_USBCTRL_TYPE_DEVICEMODEL;
@@ -54,7 +70,9 @@ int libxl__device_from_usbctrl(libxl__gc *gc, uint32_t domid,
 {
     device->backend_devid   = usbctrl->devid;
     device->backend_domid   = usbctrl->backend_domid;
-    device->backend_kind    = LIBXL__DEVICE_KIND_VUSB;
+    device->backend_kind    = (usbctrl->type == LIBXL_USBCTRL_TYPE_PV)
+                              ? LIBXL__DEVICE_KIND_VUSB
+                              : LIBXL__DEVICE_KIND_QUSB;
     device->devid           = usbctrl->devid;
     device->domid           = domid;
     device->kind            = LIBXL__DEVICE_KIND_VUSB;
@@ -64,9 +82,9 @@ int libxl__device_from_usbctrl(libxl__gc *gc, uint32_t domid,
 
 /* Add usbctrl information to xenstore.
  *
- * Adding a usb controller will add a new 'vusb' device in xenstore, and
- * add corresponding frontend, backend information to it. According to
- * "update_json", decide wether to update json config file.
+ * Adding a usb controller will add a new 'qusb' or 'vusb' device in xenstore,
+ * and add corresponding frontend, backend information to it. According to
+ * "update_json", decide whether to update json config file.
  */
 static int libxl__device_usbctrl_add_xenstore(libxl__gc *gc, uint32_t domid,
                                               libxl_device_usbctrl *usbctrl,
@@ -159,6 +177,18 @@ out:
     return rc;
 }
 
+static char *pvusb_get_device_type(libxl_usbctrl_type type)
+{
+    switch (type) {
+    case LIBXL_USBCTRL_TYPE_PV:
+        return "vusb";
+    case LIBXL_USBCTRL_TYPE_QUSB:
+        return "qusb";
+    default:
+        return NULL;
+    }
+}
+
 /* AO operation to add a usb controller.
  *
  * Generally, it does:
@@ -190,7 +220,8 @@ void libxl__device_usbctrl_add(libxl__egc *egc, uint32_t domid,
         }
     }
 
-    if (usbctrl->type != LIBXL_USBCTRL_TYPE_PV) {
+    if (usbctrl->type != LIBXL_USBCTRL_TYPE_PV &&
+        usbctrl->type != LIBXL_USBCTRL_TYPE_QUSB) {
         LOG(ERROR, "Unsupported USB controller type");
         rc = ERROR_FAIL;
         goto out;
@@ -252,7 +283,8 @@ void libxl__initiate_device_usbctrl_remove(libxl__egc *egc,
     rc = libxl_device_usbctrl_getinfo(CTX, domid, &usbctrl, &usbctrlinfo);
     if (rc) goto out;
 
-    if (usbctrlinfo.type != LIBXL_USBCTRL_TYPE_PV) {
+    if (usbctrlinfo.type != LIBXL_USBCTRL_TYPE_PV &&
+        usbctrlinfo.type != LIBXL_USBCTRL_TYPE_QUSB) {
         LOG(ERROR, "Unsupported USB controller type");
         rc = ERROR_FAIL;
         goto out;
@@ -293,6 +325,7 @@ static const char *vusb_be_from_xs_fe(libxl__gc *gc, const char *fe_path,
     const char *be_path;
     int r;
     uint32_t be_domid, fe_domid;
+    char be_type[16];
 
     r = libxl__xs_read_checked(gc, XBT_NULL, GCSPRINTF("%s/backend", fe_path),
                                &be_path);
@@ -300,10 +333,10 @@ static const char *vusb_be_from_xs_fe(libxl__gc *gc, const char *fe_path,
 
     /* Check to see that it has the proper form, and that fe_domid ==
      * target domid */
-    r = sscanf(be_path, "/local/domain/%d/backend/vusb/%d",
-               &be_domid, &fe_domid);
+    r = sscanf(be_path, "/local/domain/%d/backend/%15[^/]/%d",
+               &be_domid, be_type, &fe_domid);
 
-    if (r != 2 || fe_domid != tgt_domid) {
+    if (r != 3 || fe_domid != tgt_domid) {
         LOG(ERROR, "Malformed backend, refusing to use");
         return NULL;
     }
@@ -740,8 +773,9 @@ libxl__device_usbdev_set_default_usbctrl(libxl__gc *gc, uint32_t domid,
         for (j = 0; j < usbctrls[i].ports; j++) {
             const char *path, *tmp;
 
-            path = GCSPRINTF("%s/backend/vusb/%d/%d/port/%d",
+            path = GCSPRINTF("%s/backend/%s/%d/%d/port/%d",
                              libxl__xs_get_dompath(gc, LIBXL_TOOLSTACK_DOMID),
+                             pvusb_get_device_type(usbctrls[i].type),
                              domid, usbctrls[i].devid, j + 1);
             rc = libxl__xs_read_checked(gc, XBT_NULL, path, &tmp);
             if (rc) goto out;
@@ -883,11 +917,12 @@ out:
 
 /* Add usb information to xenstore
  *
- * Adding a usb device won't create new 'vusb' device, but only write
+ * Adding a usb device won't create new 'qusb'/'vusb' device, but only write
  * the device busid to the controller:port in xenstore.
  */
 static int libxl__device_usbdev_add_xenstore(libxl__gc *gc, uint32_t domid,
                                              libxl_device_usbdev *usbdev,
+                                             libxl_usbctrl_type type,
                                              bool update_json)
 {
     char *be_path, *busid;
@@ -931,8 +966,9 @@ static int libxl__device_usbdev_add_xenstore(libxl__gc *gc, uint32_t domid,
             if (rc) goto out;
         }
 
-        be_path = GCSPRINTF("%s/backend/vusb/%d/%d/port/%d",
+        be_path = GCSPRINTF("%s/backend/%s/%d/%d/port/%d",
                             libxl__xs_get_dompath(gc, LIBXL_TOOLSTACK_DOMID),
+                            pvusb_get_device_type(type),
                             domid, usbdev->ctrl, usbdev->port);
 
         LOG(DEBUG, "Adding usb device %s to xenstore: controller %d, port %d",
@@ -956,12 +992,14 @@ out:
 }
 
 static int libxl__device_usbdev_remove_xenstore(libxl__gc *gc, uint32_t domid,
-                                                libxl_device_usbdev *usbdev)
+                                                libxl_device_usbdev *usbdev,
+                                                libxl_usbctrl_type type)
 {
     char *be_path;
 
-    be_path = GCSPRINTF("%s/backend/vusb/%d/%d/port/%d",
+    be_path = GCSPRINTF("%s/backend/%s/%d/%d/port/%d",
                         libxl__xs_get_dompath(gc, LIBXL_TOOLSTACK_DOMID),
+                        pvusb_get_device_type(type),
                         domid, usbdev->ctrl, usbdev->port);
 
     LOG(DEBUG, "Removing usb device from xenstore: controller %d, port %d",
@@ -971,12 +1009,14 @@ static int libxl__device_usbdev_remove_xenstore(libxl__gc *gc, uint32_t domid,
 }
 
 static char *usbdev_busid_from_ctrlport(libxl__gc *gc, uint32_t domid,
-                                        libxl_device_usbdev *usbdev)
+                                        libxl_device_usbdev *usbdev,
+                                        libxl_usbctrl_type type)
 {
     return libxl__xs_read(gc, XBT_NULL,
-                          GCSPRINTF("%s/backend/vusb/%d/%d/port/%d",
+                          GCSPRINTF("%s/backend/%s/%d/%d/port/%d",
                               libxl__xs_get_dompath(gc, LIBXL_TOOLSTACK_DOMID),
-                          domid, usbdev->ctrl, usbdev->port));
+                              pvusb_get_device_type(type),
+                              domid, usbdev->ctrl, usbdev->port));
 }
 
 /* get original driver path of usb interface, stored in @drvpath */
@@ -1334,15 +1374,25 @@ static int do_usbdev_add(libxl__gc *gc, uint32_t domid,
             goto out;
         }
 
-        rc = libxl__device_usbdev_add_xenstore(gc, domid, usbdev, update_json);
+        rc = libxl__device_usbdev_add_xenstore(gc, domid, usbdev,
+                                               LIBXL_USBCTRL_TYPE_PV,
+                                               update_json);
         if (rc) goto out;
 
         rc = usbback_dev_assign(gc, busid);
         if (rc) {
-            libxl__device_usbdev_remove_xenstore(gc, domid, usbdev);
+            libxl__device_usbdev_remove_xenstore(gc, domid, usbdev,
+                                                 LIBXL_USBCTRL_TYPE_PV);
             goto out;
         }
         break;
+    case LIBXL_USBCTRL_TYPE_QUSB:
+        rc = libxl__device_usbdev_add_xenstore(gc, domid, usbdev,
+                                               LIBXL_USBCTRL_TYPE_QUSB,
+                                               update_json);
+        if (rc) goto out;
+
+        break;
     case LIBXL_USBCTRL_TYPE_DEVICEMODEL:
     default:
         LOG(ERROR, "Unsupported usb controller type");
@@ -1459,7 +1509,7 @@ static int do_usbdev_remove(libxl__gc *gc, uint32_t domid,
 
     switch (usbctrlinfo.type) {
     case LIBXL_USBCTRL_TYPE_PV:
-        busid = usbdev_busid_from_ctrlport(gc, domid, usbdev);
+        busid = usbdev_busid_from_ctrlport(gc, domid, usbdev, usbctrlinfo.type);
         if (!busid) {
             rc = ERROR_FAIL;
             goto out;
@@ -1468,13 +1518,20 @@ static int do_usbdev_remove(libxl__gc *gc, uint32_t domid,
         rc = usbback_dev_unassign(gc, busid);
         if (rc) goto out;
 
-        rc = libxl__device_usbdev_remove_xenstore(gc, domid, usbdev);
+        rc = libxl__device_usbdev_remove_xenstore(gc, domid, usbdev,
+                                                  LIBXL_USBCTRL_TYPE_PV);
         if (rc) goto out;
 
         rc = usbdev_rebind(gc, busid);
         if (rc) goto out;
 
         break;
+    case LIBXL_USBCTRL_TYPE_QUSB:
+        rc = libxl__device_usbdev_remove_xenstore(gc, domid, usbdev,
+                                                  LIBXL_USBCTRL_TYPE_QUSB);
+        if (rc) goto out;
+
+        break;
     case LIBXL_USBCTRL_TYPE_DEVICEMODEL:
     default:
         LOG(ERROR, "Unsupported usb controller type");
@@ -1559,7 +1616,6 @@ int libxl_ctrlport_to_device_usbdev(libxl_ctx *ctx,
     dompath = libxl__xs_get_dompath(gc, domid);
 
     fe_path = GCSPRINTF("%s/device/vusb/%d", dompath, ctrl);
-
     be_path = vusb_be_from_xs_fe(gc, fe_path, domid);
     if (!be_path) {
         rc = ERROR_FAIL;
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index b0a9776..8934276 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -618,6 +618,7 @@ libxl_usbctrl_type = Enumeration("usbctrl_type", [
     (0, "AUTO"),
     (1, "PV"),
     (2, "DEVICEMODEL"),
+    (3, "QUSB"),
     ])
 
 libxl_usbdev_type = Enumeration("usbdev_type", [
diff --git a/tools/libxl/libxl_types_internal.idl b/tools/libxl/libxl_types_internal.idl
index 696f5f8..177f9b7 100644
--- a/tools/libxl/libxl_types_internal.idl
+++ b/tools/libxl/libxl_types_internal.idl
@@ -23,6 +23,7 @@ libxl__device_kind = Enumeration("device_kind", [
     (7, "CONSOLE"),
     (8, "VTPM"),
     (9, "VUSB"),
+    (10, "QUSB"),
     ])
 
 libxl__console_backend = Enumeration("console_backend", [
-- 
2.6.2


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