Hi,

If you find that the whole VM does not come up, then it may either be permissions due to apparmor, (if you are running it), or as I found out, unless your motherboard supports IOMMU, then PCI passthough (which is what you appear to be trying to do) will apparently never work.

What you would normally see in the xml file is something like this:

    <interface type='network'>
      <mac address='54:52:00:18:88:29'/>
      <source network='default'/>
    </interface>

or

    <interface type='bridge'>
      <mac address='00:16:3e:19:b4:38'/>
      <source bridge='br0'/>
    </interface>

Hope this helps.

Regards,

Marco

On 01/05/11 09:38, guan qin wrote:

Hi,

I encounter a problem that the eth can't be up in the VM by using VT-d.
I boot the VM using "virsh create vt_d.xml".
The VM could recongize the NIC which was assigned .then I do in VM as follows:
#cat /sys/class/net/eth0/operstate
down
#ifconfig eth0 up
#cat /sys/class/net/eth0/operstate
down
#ficonfig eth 10.100.0.5
#cat /sys/class/net/eth0/operstate
down
more system information is attached.(uname 、ifconfig 、lspci、cmdline...)

I can't figure out the reason why the eth is still down? can anyone help me ?

best regards,
qinguan

vt_d.xml:
<domain type='kvm'>
    <name>test</name>
    <description>just test using sriov!</description>
    <os>
        <type>hvm</type>
        <boot dev='hd'/>
    </os>
    <memory>524288</memory>
    <currentMemory>524288</currentMemory>
    <on_poweroff>destroy</on_poweroff>
    <on_reboot>restart</on_reboot>
    <on_crash>restart</on_crash>

    <features><pae/><acpi/><apic/></features>
    <clock offset='utc'/>
    <devices>
        <input type='mouse' bus='usb'/>
        <disk type='file' device='disk'>
            <source file='/home/qinguan/exp/ubuntu_1.img'/>
            <target dev='hda' bus='virtio'/>
        </disk>
        <emulator>/usr/bin/kvm</emulator>
        <graphics type='vnc' port='-1'/>
        <hostdev mode='subsystem' type='pci' managed='yes'>
            <source>
                <address bus='0x0' slot='0x19' function='0x0'/>
            </source>
        </hostdev>
    </devices>
</domain>
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Marco van Beek
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