[libvirt] Why virsh domxml-to-native qemu-argv changes PCI slot number

[Tal Attaly]

Hi,

I have bridge type interface defined with slot 3 -

<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>

but after running virsh domxml-to-native qemu-argv I get slot 2-

-netdev tap,fd=21,id=hostnet0 -device e1000,netdev=hostnet0,id=net0,mac=f2:ff:ff:ff:ff:07,bus=pci.0,addr=0x2

Any idea why it's happen and how to keep the slot number?  Libvirt version is 4.5.0


here is the full domain XML -



<domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>

  <name>vm1</name>

  <uuid>dbad303e-fc1b-454e-8861-712bf1766a64</uuid>

  <memory unit='KiB'>4194304</memory>

  <currentMemory unit='KiB'>4194304</currentMemory>

  <vcpu placement='static'>1</vcpu>

  <os>

    <type arch='x86_64' machine='pc-i440fx-2.12'>hvm</type>

    <boot dev='hd'/>

  </os>

  <features>

    <acpi/>

    <apic/>

  </features>

  <cpu mode='custom' match='exact' check='partial'>

    <model fallback='allow'>SandyBridge-IBRS</model>

  </cpu>

  <clock offset='utc'>

    <timer name='rtc' tickpolicy='catchup'/>

    <timer name='pit' tickpolicy='delay'/>

    <timer name='hpet' present='no'/>

  </clock>

  <on_poweroff>destroy</on_poweroff>

  <on_reboot>restart</on_reboot>

  <on_crash>destroy</on_crash>

  <pm>

    <suspend-to-mem enabled='no'/>

    <suspend-to-disk enabled='no'/>

  </pm>

  <devices>

    <emulator>/qemu/x86_64-softmmu/qemu-system-x86_64</emulator>

    <disk type='file' device='disk'>

      <driver name='qemu' type='qcow2'/>

      <source file='/var/lib/libvirt/images/vm.img'/>

      <target dev='hda' bus='ide'/>

      <address type='drive' controller='0' bus='0' target='0' unit='0'/>

    </disk>

    <controller type='usb' index='0' model='ich9-ehci1'>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x7'/>

    </controller>

    <controller type='usb' index='0' model='ich9-uhci1'>

      <master startport='0'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0' multifunction='on'/>

    </controller>

    <controller type='usb' index='0' model='ich9-uhci2'>

      <master startport='2'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x1'/>

    </controller>

    <controller type='usb' index='0' model='ich9-uhci3'>

      <master startport='4'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x2'/>

    </controller>

    <controller type='ide' index='0'>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>

    </controller>

    <controller type='pci' index='0' model='pci-root'/>

    <interface type='bridge'>

      <mac address='f2:ff:ff:ff:ff:07'/>

      <source bridge='br0:'/>

      <model type='e1000'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>

    </interface>

    <serial type='tcp'>

      <source mode='bind' host='10.210.27.119' service='9999'/>

      <protocol type='telnet'/>

      <target type='isa-serial' port='0'>

        <model name='isa-serial'/>

      </target>

    </serial>

    <console type='tcp'>

      <source mode='bind' host='10.210.27.119' service='9999'/>

      <protocol type='telnet'/>

      <target type='serial' port='0'/>

    </console>

    <input type='mouse' bus='ps2'/>

    <input type='keyboard' bus='ps2'/>

    <memballoon model='virtio'>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>

    </memballoon>

  </devices>

  <qemu:commandline>

    <qemu:env name='CONFIG_FILE' value='/opt/cfg/qemu.cfg'/>

  </qemu:commandline>

</domain>



Thanks,
Tal

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