KVM/qemu/libvirt VM PCI Domain/Bus/Slot/Function assignment using virt-install

Shawn   asked:

I am trying to create a VM using the virt-install utility and while that is easy enough to do what I would like to be able to do is proving quite difficult.

I would like to be able to specify the domain/bus/slot/function of the ethernet interfaces that I am adding. I realize that I can use virsh edit after the domain is created to modify these settings from the defaults they are given but I was wondering if anyone knows whether or not it can be dome from the command line using the virt-install utility and if it can be done, do you know what the proper syntax is?

Thank you.


My answer:

Yes, you can specify all those on the virt-install command line. Check virt-install --network=? for a complete list of what you can specify. These correspond to the attributes set in XML.

For instance, if your <interface> looks like this:

    <interface type='bridge'>
      <mac address='52:54:00:c2:de:ce'/>
      <source bridge='br0'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>

You can specify it like:

virt-install ... -network bridge=br0,model=virtio,mac=52:54:00:c2:de:ce,address.type=pci,address.domain=0,address.bus=1,address.slot=0,address.function=0 ...

You can also, instead of doing an installation, use --print-xml to get the generated XML. Then you can customize this to your liking and automate many installations directly without going through virt-install.

       --print-xml [STEP]
           Print the generated XML of the guest, instead of defining it. By
           default this WILL do storage creation (can be disabled with
           --dry-run). This option implies --quiet.

           If the VM install has multiple phases, by default this will print
           all generated XML. If you want to print a particular step, use
           --print-xml 2 (for the second phase XML).

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