This basically reverts commit ba64b97134a6129a48684f22f31be92c3b6eef96 "libxl: Allow libxl to set NIC devid". However assigning devid's before calling libxlMakeNic does not work as that is calling libxl_device_nic_init which sets it back to -1. Right now auto-assignment only works in the hotplug case. But even if that would be fixed at some point (if that is possible at all), this would add a weird dependency between Xen and libvirt versions. The change here should accept any auto-assignment that makes it into libxl_device_nic_init. My understanding is that a caller always is allowed to make the devid choice itself. And assuming libxlMakeNicList is only used on domain creation, a sequential numbering should be ok. Signed-off-by: Stefan Bader <stefan.bader(a)canonical.com&gt; --- src/libxl/libxl_conf.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c index 04d01af..4cefadf 100644 --- a/src/libxl/libxl_conf.c +++ b/src/libxl/libxl_conf.c @@ -918,6 +918,13 @@ libxlMakeNicList(virDomainDefPtr def, libxl_domain_config *d_config) for (i = 0; i < nnics; i++) { if (libxlMakeNic(def, l_nics[i], &x_nics[i])) goto error; + /* + * The devid (at least right now) will not get initialized by + * libxl in the setup case but is required for starting the + * device-model. + */ + if (x_nics[i].devid < 0) + x_nics[i].devid = i; } d_config->nics = x_nics; -- 1.7.9.5