Re: [libvirt] RFC: setting mac address on network devices being assigned to a guest via PCI passthrough (<hostdev>)
On 01/23/2012 11:12 AM, Laine Stump wrote:
On 01/23/2012 09:08 AM, Paolo Bonzini wrote:
>
> In view of the discussion on SCSI passthrough, it seems to me that
> this should be attached to an <interface> element:
>
> <devices>
> <interface type='hostdev'>
> <source>
> <address type='pci' bus='0x06' slot='0x02'
function='0x0'/>
> </source>
> <mac address='00:16:3e:5d:c7:9e'/>
> <address type='pci' .../>
> </interface>
> </devices>
BTW, another advantage of defining these in <interface> rather than
<hostdev> is that it makes it easier to decide when to auto-generate a
MAC address - if there's an <interface>, libvirt knows that if a MAC
address isn't given, it should always generate one. <hostdev> currently
has no concept of <mac address>, so we would have to come up with some
syntax hack to indicate that one should be created, e.g. if <mac
address=""/> is given (or maybe just an empty "<mac>"), then
a mac
address should be autogenerated. That's inconsistent with existing
practice in other places that mac address is used, though.