libxl: refactor DEFINE_DEVICE_REMOVE to fit for more device types

For some device type, device removal operation needs to be
handled specially, like usbctrl, it needs to remove all usb
devices under it first, then remove usbctrl. Extend
DEFINE_DEVICE_REMOVE to support generic and custom way
For those need to be handled specially, call
DEFINE_DEVICE_REMOVE_CUSTOM, it requires user defined
libxl__initiate_device_##type##_remove. Otherwise, just
call DEFINE_DEVICE_REMOVE as before.

Signed-off-by: George Dunlap <george.dunlap@citrix.com>
Signed-off-by: Chunyan Liu <cyliu@suse.com>
Reviewed-by: George Dunlap <george.dunlap@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 8dde37a1a4edb755daf85a681093f5bd4ca01344..4f672d6791aa041c8c3bd77af5b3622db594f6cf 100644 (file)
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -3134,7 +3134,7 @@ void libxl__device_disk_local_initiate_detach(libxl__egc *egc,
         aodev->dev = device;
         aodev->callback = local_device_detach_cb;
         aodev->force = 0;
-        libxl__initiate_device_remove(egc, aodev);
+        libxl__initiate_device_generic_remove(egc, aodev);
         return;
     }
 
@@ -4103,7 +4103,7 @@ out:
  * libxl_device_vfb_remove
  * libxl_device_vfb_destroy
  */
-#define DEFINE_DEVICE_REMOVE(type, removedestroy, f)                    \
+#define DEFINE_DEVICE_REMOVE_EXT(type, remtype, removedestroy, f)        \
     int libxl_device_##type##_##removedestroy(libxl_ctx *ctx,           \
         uint32_t domid, libxl_device_##type *type,                      \
         const libxl_asyncop_how *ao_how)                                \
@@ -4123,13 +4123,19 @@ out:
         aodev->dev = device;                                            \
         aodev->callback = device_addrm_aocomplete;                      \
         aodev->force = f;                                               \
-        libxl__initiate_device_remove(egc, aodev);                      \
+        libxl__initiate_device_##remtype##_remove(egc, aodev);          \
                                                                         \
     out:                                                                \
-        if (rc) return AO_CREATE_FAIL(rc);                                    \
+        if (rc) return AO_CREATE_FAIL(rc);                              \
         return AO_INPROGRESS;                                           \
     }
 
+#define DEFINE_DEVICE_REMOVE(type, removedestroy, f) \
+    DEFINE_DEVICE_REMOVE_EXT(type, generic, removedestroy, f)
+
+#define DEFINE_DEVICE_REMOVE_CUSTOM(type, removedestroy, f)  \
+    DEFINE_DEVICE_REMOVE_EXT(type, type, removedestroy, f)
+
 /* Define all remove/destroy functions and undef the macro */
 
 /* disk */
@@ -4158,6 +4164,8 @@ DEFINE_DEVICE_REMOVE(vtpm, destroy, 1)
  * 2. dynamically add/remove qemu chardevs via qmp messages. */
 
 #undef DEFINE_DEVICE_REMOVE
+#undef DEFINE_DEVICE_REMOVE_CUSTOM
+#undef DEFINE_DEVICE_REMOVE_EXT
 
 /******************************************************************************/
 
@@ -4362,7 +4370,7 @@ static int remove_device(libxl__egc *egc, libxl__ao *ao,
         aodev->dev = dev;
         aodev->action = LIBXL__DEVICE_ACTION_REMOVE;
         aodev->callback = device_complete;
-        libxl__initiate_device_remove(egc, aodev);
+        libxl__initiate_device_generic_remove(egc, aodev);
         break;
     case LIBXL__DEVICE_KIND_QDISK:
         if (--dguest->num_qdisks == 0) {

diff --git a/tools/libxl/libxl_device.c b/tools/libxl/libxl_device.c
index 8bb5e93b5e800c38274e2f8f02d25157495c278b..a356e2a76e91f9c8b86aed2f804d011a433523f9 100644 (file)
--- a/tools/libxl/libxl_device.c
+++ b/tools/libxl/libxl_device.c
@@ -676,7 +676,7 @@ 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;
-                libxl__initiate_device_remove(egc, aodev);
+                libxl__initiate_device_generic_remove(egc, aodev);
             }
         }
     }
@@ -775,8 +775,8 @@ out:
     return;
 }
 
-void libxl__initiate_device_remove(libxl__egc *egc,
-                                   libxl__ao_device *aodev)
+void libxl__initiate_device_generic_remove(libxl__egc *egc,
+                                           libxl__ao_device *aodev)
 {
     STATE_AO_GC(aodev->ao);
     xs_transaction_t t = 0;
@@ -806,7 +806,7 @@ void libxl__initiate_device_remove(libxl__egc *egc,
             (info.paused || info.dying || info.shutdown)) {
             /*
              * TODO: 4.2 Bodge due to QEMU, see comment on top of
-             * libxl__initiate_device_remove in libxl_internal.h
+             * libxl__initiate_device_generic_remove in libxl_internal.h
              */
             rc = libxl__ev_time_register_rel(ao, &aodev->timeout,
                                              device_qemu_timeout,
@@ -942,7 +942,7 @@ static void device_backend_callback(libxl__egc *egc, libxl__ev_devstate *ds,
         !aodev->force) {
         LOG(DEBUG, "Timeout reached, initiating forced remove");
         aodev->force = 1;
-        libxl__initiate_device_remove(egc, aodev);
+        libxl__initiate_device_generic_remove(egc, aodev);
         return;
     }
 

diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index 6eb87493b88b56fc9da3ec7952b092d96ef2c107..fe97447c6e95aeb2a3ad99a0d1bb37dd528fe0a4 100644 (file)
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -2614,8 +2614,8 @@ _hidden void libxl__wait_device_connection(libxl__egc*,
  *
  * Once finished, aodev->callback will be executed.
  */
-_hidden void libxl__initiate_device_remove(libxl__egc *egc,
-                                           libxl__ao_device *aodev);
+_hidden void libxl__initiate_device_generic_remove(libxl__egc *egc,
+                                                   libxl__ao_device *aodev);
 
 /*
  * libxl__get_hotplug_script_info returns the args and env that should