[libvirt-users] can't up the eth in the vm and access to network

[Osier Yang]

于 2011年05月03日 15:38, guan qin 写道:
> Thanks a lot for your reply sincerely!
> Actually ,if I do as what 
> http://www.linux-kvm.org/page/How_to_assign_devices_with_VT-d_in_KVM said,:
> "
> # echo "8086 10b9" > /sys/bus/pci/drivers/pci-stub/new_id
> # echo 0000:01:00.0 > /sys/bus/pci/devices/0000:01:00.0/driver/unbind
> # echo 0000:01:00.0 > /sys/bus/pci/drivers/pci-stub/bind
> "
> Then I can assign a NIC to the VM ,and the VM also can use the NIC to 
> access the network.
> But , according the libvirt guide that 
> http://libvirt.org/formatdomain.html#elementsUSB shows:
> "
> When |managed| is "yes" for a PCI device, it is detached from the host 
> before being passed on to the guest.
> "
> So should I still "unbind " the device from the host OS driver first ? 
> If that ,What's the "detached" meaning ? thanks.
> best regards,
> qinguan

libvirt trys to detach the PCI device from host as preparation when
starting up the domain, and it also binds the device to pci_stub
driver, so it's strange that you need to do it manually? what's
your libvirt version?

> 在 2011年5月3日 上午8:47，David White <dwhite at speakeasy.net 
> <mailto:dwhite at speakeasy.net>>写道：
> 
> 
>     did you 'unbind' the device from the host OS driver?
> 
> 
>     On 05/01/2011 01:38 AM, 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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> 
> 
> 
> 
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