Re: macvtap support in libvirt 0.9.8

Stefan Berger <stefanb@xxxxxxxxxxxxxxxxxx> · Mon, 12 Dec 2011 18:16:13 -0500



    On 12/12/2011 05:20 AM, Amit Tewari wrote:
    
      
          Hi all,
           
          Please ignore my previous mail..
           
          This is my test scenario
           
          My test
                environment
          Host
                os=rhel6.1
          Guest os =
                rhel6.1
          Libvirt=0.9.8
          Kvm
                hypervisor
           
          I am
                creating a macvtap interface on host machine at eth0
                interface
          #ip link
                show macvtap0
          51:
                macvtap0@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP>
                mtu 1500 qdisc mq state UNKNOWN qlen 500
             
                link/ether 1e:aa:f7:43:7e:3d brd
                ff:ff:ff:ff:ff:ff
        
      
    I assume you created this device via 'ip link add link eth0 type
    macvtap' command?

    
          I have made
                this entry in guest xml file
           
          <interface
                type='direct'>
               
                <mac
                address=1e:aa:f7:43:7e:3d’/>
        
      
    The direct type of interface automatically creates a macvtap
    interface. However, it will fail if there already is a macvtap
    device with that same MAC address connected to the same physical
    interface, here eth0. So if you delete this macvtap interface first
    (ip link del mavtap0), then start the VM using 'virsh start' then it
    will work. libvirt wants to create a macvtap device since only then
    it knows that it is the 'owner' of the device; it doesn't just us a
    macvtap device that happens to be available since that could be
    'owner' by some other application.

    
    Regards,

       Stefan

    
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