sorry for missing some information. I checkd the device that : # readlink /sys/bus/pci/devices/0000\:00\:19.0/driver ../../../bus/pci/drivers/pci-stub the device has been already claimed by pci-stub and under the control of pci_stub. so the reason that can't up the eth in VM maybe has nothing to do with the libvirt version. After doing the first three steps:<a href="http://www.linux-kvm.org/page/How_to_assign_devices_with_VT-d_in_KVM">How_to_assign_devices_with_VT-d_in_KVM</a> ( 1. Modifying kernel config 2. build kernel 3. reboot and verify that your system has IOMMU support ), I use "virsh create vt_d.xml" instead of the ubind/bind and assign device. (the kvm and kvm_intel has already been loaded) should I do something others to use the VT_d? best regards, qinguan <div class="gmail_quote">在 2011年5月4日下午2:31，guan qin <<a href="mailto:qinguan0619@gmail.com">qinguan0619@gmail.com</a>>写道： <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Hi，the libvirt version is 0.8.3, I just used "apt-get install libvirt-bin" to install it under debian6.0.1a. Is it necessary to install 0.8.4 or higher version ? Best regards, qinguan <div class="gmail_quote"><div class="im"> 在 2011年5月3日下午4:28，Osier Yang <<a href="mailto:jyang@redhat.com" target="_blank">jyang@redhat.com</a>>写道： </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> 于 2011年05月03日 15:38, guan qin 写道:<div><div></div><div class="h5"> <div>> Thanks a lot for your reply sincerely! > Actually ,if I do as what > <a href="http://www.linux-kvm.org/page/How_to_assign_devices_with_VT-d_in_KVM" target="_blank">http://www.linux-kvm.org/page/How_to_assign_devices_with_VT-d_in_KVM</a> 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 > <a href="http://libvirt.org/formatdomain.html#elementsUSB" target="_blank">http://libvirt.org/formatdomain.html#elementsUSB</a> 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 </div>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? <div> > 在 2011年5月3日上午8:47，David White <<a href="mailto:dwhite@speakeasy.net" target="_blank">dwhite@speakeasy.net</a> </div>> <mailto:<a href="mailto:dwhite@speakeasy.net" target="_blank">dwhite@speakeasy.net</a>>>写道： <div><div></div><div>> > > 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> >> >> >> _______________________________________________ >> libvirt-users mailing list </div></div>>> <a href="mailto:libvirt-users@redhat.com" target="_blank">libvirt-users@redhat.com</a> <mailto:<a href="mailto:libvirt-users@redhat.com" target="_blank">libvirt-users@redhat.com</a>> <div><div></div><div>>> <a href="https://www.redhat.com/mailman/listinfo/libvirt-users" target="_blank">https://www.redhat.com/mailman/listinfo/libvirt-users</a> > > > > > _______________________________________________ > libvirt-users mailing list > <a href="mailto:libvirt-users@redhat.com" target="_blank">libvirt-users@redhat.com</a> > <a href="https://www.redhat.com/mailman/listinfo/libvirt-users" target="_blank">https://www.redhat.com/mailman/listinfo/libvirt-users</a> </div></div></div></div></blockquote></div> </blockquote></div>