Re: [libvirt] [Xen-devel] Setting devid for emulated NICs (Xen 4.3.1 / libvirt 1.2.0) using libxl driver

Oh, just while talking about setdefault. Jim, this is one of the odd things when moving from xm to xl stack from libvirt: libvirt defaults to the netfront NIC when no model is specified and sets the type. The libxl setdefault function sets the model to rtl8139 but leaves the type untouched.

So setting no model in the xml config creates a domain with no emulated NIC (this does not matter after Linux is up because the emulated devices get unplugged). Just that PXE boot will not work. This gets odd because with the old xen (xm) driver, no model meant rtl8139. Sigh, and to hijack this thread even further I noticed a quite unexpected behaviour when starting a domain trhough libvirt and then try to use "xl list -l" to get config details. "xl list" shows all running domains but "xl list -l" produces something like "you have to specify a domain name". I found the origin of this to be libxl_userdata_retrieve which takes a userdate_userid as an argument. Libvirt uses "libvirt-xml" for that, while xl uses "xl". This might be intentional and the bug is just that we need a better check for not finding the userdata and then skipping those domains. On the other hand ... its after all in both cases a domain created and started through libxl...