On Fri, Jan 24, 2014 at 10:37:20AM +0800, Sheldon wrote: > Now I working on a new KVM management tool base on html5 and libvirt > > we will support a REST API for detach and attach guest interface. > > we want to use mac as the identifier of the network interface. > > That meas we should get the mac after the user create a interface. > also other people may be doing the exact same thing at the exact same > time to create a interface. > > > Here are the demo codes: > > dom = self._get_vm(vm) > xml = """ > <interface type='network'> > <source network='default'/> > </interface> > """ > dom.attachDeviceFlags(xml, libvirt.VIR_DOMAIN_AFFECT_CURRENT) > # now I want to get the mac, how to get it? >
You have to parse the XML back and find it.
>
> I have check libvirt use this code to generate a mac address.
> does libvirt can gurantee that the MAC address generated is unique?
>
No, as mentioned in the second subthread, the XML you provided is
incomplete and can cause address clashing.
So te best answer to your question in $SUBJ would be "generate it
yourself and add it to the XML before attaching".
Martin
>
> void virMacAddrGenerate(const unsigned char prefix[VIR_MAC_PREFIX_BUFLEN],
> virMacAddrPtr addr)
> {
> addr->addr[0] = prefix[0];
> addr->addr[1] = prefix[1];
> addr->addr[2] = prefix[2];
> addr->addr[3] = virRandomBits(8);
> addr->addr[4] = virRandomBits(8);
> addr->addr[5] = virRandomBits(8);
> }
> libvirt also use the KVM prefix as default as it's in the privately
> administered range:
> 52:54:00:XX:XX:XX
>
>
>
> --
> Thanks and best regards!
>
> Sheldon Feng(冯少合)<[email protected]>
> IBM Linux Technology Center
>
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