libxl: convert libxl_device_nic_add to an async operation

This patch converts libxl_device_nic_add to an ao operation that
waits for device backend to reach state XenbusStateInitWait and then
marks the operation as completed. This is not really useful now, but
will be used by latter patches that will launch hotplug scripts after
we reached the desired xenbus state.

Calls to libxl_device_nic_add have also been moved to occur after the
device model has been launched, so when hotplug scripts are called
from this functions the interfaces already exists.

As usual, libxl_device_nic_add callers have been modified, and the
internal function libxl__device_disk_add has been used if the call was
inside an already running ao.

Signed-off-by: Roger Pau Monne <roger.pau@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Committed-by: Ian Campbell <ian.campbell@citrix.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/tools/libxl/libxl_device.c b/tools/libxl/libxl_device.c
index 835b4ad235..ed33f6f644 100644
--- a/tools/libxl/libxl_device.c
+++ b/tools/libxl/libxl_device.c
@@ -455,6 +455,7 @@ void libxl__ao_devices_callback(libxl__egc *egc, libxl__ao_device *aodev)
  *
  * The following functions are defined:
  * libxl__add_disks
+ * libxl__add_nics
  */
 
 #define DEFINE_DEVICES_ADD(type)                                               \
@@ -473,6 +474,7 @@ void libxl__ao_devices_callback(libxl__egc *egc, libxl__ao_device *aodev)
     }
 
 DEFINE_DEVICES_ADD(disk)
+DEFINE_DEVICES_ADD(nic)
 
 #undef DEFINE_DEVICES_ADD