By writing an empty "hotplug-status" xenstore node in the backend path libxl can force Linux netback to wait for hotplug script execution before proceeding to the 'connected' state.
This is required so that netback doesn't skip state 2 (InitWait) and thus blocks libxl waiting for such state in order to launch the hotplug script (see libxl__wait_device_connection). Reported-by: James Dingwall <james-...@dingwall.me.uk> Signed-off-by: Roger Pau Monné <roger....@citrix.com> Tested-by: James Dingwall <james-...@dingwall.me.uk> --- Cc: Wei Liu <wei....@kernel.org> Cc: Paul Durrant <p...@xen.org> --- tools/libs/light/libxl_nic.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/tools/libs/light/libxl_nic.c b/tools/libs/light/libxl_nic.c index 0b45469dca..0b9e70c9d1 100644 --- a/tools/libs/light/libxl_nic.c +++ b/tools/libs/light/libxl_nic.c @@ -248,6 +248,13 @@ static int libxl__set_xenstore_nic(libxl__gc *gc, uint32_t domid, flexarray_append(ro_front, "mtu"); flexarray_append(ro_front, GCSPRINTF("%u", nic->mtu)); + /* + * Force backend to wait for hotplug script execution before switching to + * connected state. + */ + flexarray_append(back, "hotplug-status"); + flexarray_append(back, ""); + return 0; } -- 2.34.1