Hi ,<br>&nbsp;I look into the qemu log file ,find that :<br><br>LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin HOME=/ QEMU_AUDIO_DRV=none /usr/bin/kvm -S -M pc-0.12 -enable-kvm -m 512 -smp 1,sockets=1,cores=1,threads=1 -name vt_d_5 -uuid 05f608a3-f64f-2418-a90a-d611982c8336 -nodefaults -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/vt_d_5.monitor,server,nowait -mon chardev=monitor,mode=readline -rtc base=utc -boot c -drive file=/home/qinguan/exp/kvm_vtd/ubuntu_1.img,if=none,id=drive-virtio-disk0,boot=on,format=raw -device virtio-blk-pci,bus=pci.0,addr=0x3,drive=drive-virtio-disk0,id=virtio-disk0 -usb -device usb-mouse,id=input0 -vnc <a href="http://127.0.0.1:0">127.0.0.1:0</a> -vga cirrus -device pci-assign,host=00:19.0,id=hostdev0,bus=pci.0,addr=0x4 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5<br>
Failed to assign irq for &quot;hostdev0&quot;: Operation not permitted<br>Perhaps you are assigning a device that shares an IRQ with another device?<br>Failed to assign irq for &quot;hostdev0&quot;: Operation not permitted<br>
Perhaps you are assigning a device that shares an IRQ with another device?<br>Failed to assign irq for &quot;hostdev0&quot;: Operation not permitted<br>Perhaps you are assigning a device that shares an IRQ with another device?<br>
Failed to assign irq for &quot;hostdev0&quot;: Operation not permitted<br>Perhaps you are assigning a device that shares an IRQ with another device?<br>Failed to assign irq for &quot;hostdev0&quot;: Operation not permitted<br>
<br>maybe the VM can&#39;t access to the network because of Failed&nbsp; to assign irg for &quot;hostdev0&quot;?<br><br>in kern.log :<br>May&nbsp; 1 12:40:07 Optiplex-780 kernel: [ 3172.784803] e1000e 0000:00:19.0: PCI INT A disabled<br>
May&nbsp; 1 12:40:07 Optiplex-780 kernel: [ 3172.784863] pci-stub 0000:00:19.0: claimed by stub<br>May&nbsp; 1 12:40:07 Optiplex-780 kernel: [ 3173.103965] pci-stub 0000:00:19.0: PCI INT A -&gt; GSI 21 (level, low) -&gt; IRQ 21<br>
May&nbsp; 1 12:40:07 Optiplex-780 kernel: [ 3173.204030] pci-stub 0000:00:19.0: restoring config space at offset 0x6 (was 0x1, writing 0xece1)<br>May&nbsp; 1 12:40:07 Optiplex-780 kernel: [ 3173.204035] pci-stub 0000:00:19.0: restoring config space at offset 0x5 (was 0x0, writing 0xf7ad9000)<br>
May&nbsp; 1 12:40:07 Optiplex-780 kernel: [ 3173.204039] pci-stub 0000:00:19.0: restoring config space at offset 0x4 (was 0x0, writing 0xf7ae0000)<br>May&nbsp; 1 12:40:07 Optiplex-780 kernel: [ 3173.204045] pci-stub 0000:00:19.0: restoring config space at offset 0x1 (was 0x100000, writing 0x100103)<br>
May&nbsp; 1 12:40:07 Optiplex-780 kernel: [ 3173.435751] assign device 0:0:19.0<br>May&nbsp; 1 12:44:24 Optiplex-780 kernel: [ 3430.568526] pci-stub 0000:00:19.0: restoring config space at offset 0x6 (was 0x1, writing 0xece1)<br>May&nbsp; 1 12:44:24 Optiplex-780 kernel: [ 3430.568532] pci-stub 0000:00:19.0: restoring config space at offset 0x5 (was 0x0, writing 0xf7ad9000)<br>
May&nbsp; 1 12:44:24 Optiplex-780 kernel: [ 3430.568537] pci-stub 0000:00:19.0: restoring config space at offset 0x4 (was 0x0, writing 0xf7ae0000)<br>May&nbsp; 1 12:44:24 Optiplex-780 kernel: [ 3430.568543] pci-stub 0000:00:19.0: restoring config space at offset 0x1 (was 0x100000, writing 0x100103)<br>
May&nbsp; 1 12:44:24 Optiplex-780 kernel: [ 3430.568561] pci-stub 0000:00:19.0: PCI INT A disabled<br><br><br>root@Optiplex-780:/var/log/libvirt/qemu# cat /proc/interrupts<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CPU0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CPU1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CPU2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CPU3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>
&nbsp; 0:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 97&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp; IO-APIC-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; timer<br>&nbsp; 1:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp; IO-APIC-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; i8042<br>&nbsp; 7:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp; IO-APIC-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; parport0<br>
&nbsp; 8:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp; IO-APIC-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; rtc0<br>&nbsp; 9:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp; IO-APIC-fasteoi&nbsp;&nbsp; acpi<br>&nbsp;12:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp; IO-APIC-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; i8042<br>
&nbsp;16:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp; IO-APIC-fasteoi&nbsp;&nbsp; uhci_hcd:usb2<br>&nbsp;17:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5822&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1952&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3614&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2233&nbsp;&nbsp; IO-APIC-fasteoi&nbsp;&nbsp; uhci_hcd:usb4, uhci_hcd:usb7<br>&nbsp;18:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp; IO-APIC-fasteoi&nbsp;&nbsp; uhci_hcd:usb8<br>
&nbsp;22:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp; IO-APIC-fasteoi&nbsp;&nbsp; ehci_hcd:usb1, uhci_hcd:usb5<br>&nbsp;23:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1461&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1299&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1153&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 912&nbsp;&nbsp; IO-APIC-fasteoi&nbsp;&nbsp; ehci_hcd:usb3, uhci_hcd:usb6<br>&nbsp;24:&nbsp;&nbsp;&nbsp;&nbsp; 268579&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp; HPET_MSI-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; hpet2<br>
&nbsp;25:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp; 286310&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp; HPET_MSI-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; hpet3<br>&nbsp;26:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp; 210675&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp; HPET_MSI-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; hpet4<br>&nbsp;27:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp; 256688&nbsp; HPET_MSI-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; hpet5<br>
&nbsp;29:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp; DMAR_MSI-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; dmar1<br>&nbsp;30:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp; DMAR_MSI-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; dmar0<br>&nbsp;31:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp; DMAR_MSI-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; dmar2<br>
&nbsp;35:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp; PCI-MSI-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; eth1<br>&nbsp;36:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1456&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 916&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1323&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1657&nbsp;&nbsp; PCI-MSI-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; eth1-rx-0<br>&nbsp;37:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1031&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 772&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1459&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 895&nbsp;&nbsp; PCI-MSI-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; eth1-rx-1<br>
&nbsp;38:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 958&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 965&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 785&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 470&nbsp;&nbsp; PCI-MSI-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; eth1-rx-2<br>&nbsp;39:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1319&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 557&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1007&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 714&nbsp;&nbsp; PCI-MSI-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; eth1-rx-3<br>&nbsp;40:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 892&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 864&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 417&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1134&nbsp;&nbsp; PCI-MSI-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; eth1-tx-0<br>
&nbsp;41:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 414&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 749&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 998&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 606&nbsp;&nbsp; PCI-MSI-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; eth1-tx-1<br>&nbsp;42:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 307&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 921&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 375&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 332&nbsp;&nbsp; PCI-MSI-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; eth1-tx-2<br>&nbsp;43:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 966&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 693&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 396&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 502&nbsp;&nbsp; PCI-MSI-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; eth1-tx-3<br>
&nbsp;54:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 7109&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5755&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5683&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5609&nbsp;&nbsp; PCI-MSI-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ahci<br>&nbsp;55:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 74&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 105&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 73&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 84&nbsp;&nbsp; PCI-MSI-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; hda_intel<br>&nbsp;56:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1446&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 927&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1108&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 870&nbsp;&nbsp; PCI-MSI-edge&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; i915<br>
NMI:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp; Non-maskable interrupts<br>LOC:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 740&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 725&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 703&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 677&nbsp;&nbsp; Local timer interrupts<br>SPU:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp; Spurious interrupts<br>
PMI:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp; Performance monitoring interrupts<br>PND:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp; Performance pending work<br>RES:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 665&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 679&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 714&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 547&nbsp;&nbsp; Rescheduling interrupts<br>
CAL:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5332&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 408&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5619&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 539&nbsp;&nbsp; Function call interrupts<br>TLB:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1880&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2843&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1788&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3202&nbsp;&nbsp; TLB shootdowns<br>TRM:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp; Thermal event interrupts<br>
THR:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp; Threshold APIC interrupts<br>MCE:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp; Machine check exceptions<br>MCP:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5&nbsp;&nbsp; Machine check polls<br>
ERR:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3<br>MIS:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0<br>root@Optiplex-780:/var/log/libvirt/qemu# <br><br>I search the similarly problems that sharing the irg&nbsp; but never find a answer , and now I have no idea.<br>How to solve the problem&nbsp; ,can you help me ? thanks.<br>
<br>best regards,<br>qinguan<br><br><br><div class="gmail_quote">在 2011年5月4日 下午2:55，guan qin <span dir="ltr">&lt;<a href="mailto:qinguan0619@gmail.com">qinguan0619@gmail.com</a>&gt;</span>写道：<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
sorry for missing some information.<br>I checkd the device that :<br># readlink /sys/bus/pci/devices/0000\:00\:19.0/driver<br>../../../bus/pci/drivers/pci-stub<br><br>the device has been already claimed by pci-stub and under the control of pci_stub.<br>

so the reason that can&#39;t up the eth in VM maybe has nothing to do with the libvirt version.<br><br>After doing the first three steps:<a href="http://www.linux-kvm.org/page/How_to_assign_devices_with_VT-d_in_KVM" target="_blank">How_to_assign_devices_with_VT-d_in_KVM</a><br>

(<br><b>1. Modifying kernel config<br></b><b>2. build kernel<br></b><b>3. reboot and verify that your system has IOMMU support</b><br>),<br>I use &quot;virsh create vt_d.xml&quot; instead of the ubind/bind and assign device.<br>

(the kvm and kvm_intel has already been loaded)<br>should I do something others to use the VT_d?<br><br>best regards,<br>qinguan<br><br><br><div class="gmail_quote">在 2011年5月4日 下午2:31，guan qin <span dir="ltr">&lt;<a href="mailto:qinguan0619@gmail.com" target="_blank">qinguan0619@gmail.com</a>&gt;</span>写道：<div>
<div></div><div class="h5"><br>
<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&nbsp; &quot;apt-get install libvirt-bin&quot; to install it under debian6.0.1a.<br>

Is it&nbsp; necessary to install 0.8.4 or higher version ?<br><br>Best regards,<br>qinguan<br><br><br><div class="gmail_quote"><div>
在 2011年5月3日 下午4:28，Osier Yang <span dir="ltr">&lt;<a href="mailto:jyang@redhat.com" target="_blank">jyang@redhat.com</a>&gt;</span>写道：<br></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><br>
<div>&gt; Thanks a lot for your reply sincerely!<br>
&gt; Actually ,if I do as what<br>
&gt; <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,:<br>
&gt; &quot;<br>
&gt; # echo &quot;8086 10b9&quot; &gt; /sys/bus/pci/drivers/pci-stub/new_id<br>
&gt; # echo 0000:01:00.0 &gt; /sys/bus/pci/devices/0000:01:00.0/driver/unbind<br>
&gt; # echo 0000:01:00.0 &gt; /sys/bus/pci/drivers/pci-stub/bind<br>
&gt; &quot;<br>
&gt; Then I can assign a NIC to the VM ,and the VM also can use the NIC to<br>
&gt; access the network.<br>
&gt; But , according the libvirt guide that<br>
&gt; <a href="http://libvirt.org/formatdomain.html#elementsUSB" target="_blank">http://libvirt.org/formatdomain.html#elementsUSB</a> shows:<br>
&gt; &quot;<br>
&gt; When |managed| is &quot;yes&quot; for a PCI device, it is detached from the host<br>
&gt; before being passed on to the guest.<br>
&gt; &quot;<br>
&gt; So should I still &quot;unbind &quot; the device from the host OS driver first ?<br>
&gt; If that ,What&#39;s the &quot;detached&quot; meaning ? thanks.<br>
&gt; best regards,<br>
&gt; qinguan<br>
<br>
</div>libvirt trys to detach the PCI device from host as preparation when<br>
starting up the domain, and it also binds the device to pci_stub<br>
driver, so it&#39;s strange that you need to do it manually? what&#39;s<br>
your libvirt version?<br>
<div><br>
&gt; 在 2011年5月3日 上午8:47，David White &lt;<a href="mailto:dwhite@speakeasy.net" target="_blank">dwhite@speakeasy.net</a><br>
</div>&gt; &lt;mailto:<a href="mailto:dwhite@speakeasy.net" target="_blank">dwhite@speakeasy.net</a>&gt;&gt;写道：<br>
<div><div></div><div>&gt;<br>
&gt;<br>
&gt; &nbsp; &nbsp; did you &#39;unbind&#39; the device from the host OS driver?<br>
&gt;<br>
&gt;<br>
&gt; &nbsp; &nbsp; On 05/01/2011 01:38 AM, guan qin wrote:<br>
&gt;&gt; &nbsp; &nbsp; Hi,<br>
&gt;&gt;<br>
&gt;&gt; &nbsp; &nbsp; I encounter a problem that the eth can&#39;t be up in the VM by using<br>
&gt;&gt; &nbsp; &nbsp; VT-d.<br>
&gt;&gt; &nbsp; &nbsp; I boot the VM using &quot;virsh create vt_d.xml&quot;.<br>
&gt;&gt; &nbsp; &nbsp; The VM could recongize the NIC which was assigned .then I do in VM<br>
&gt;&gt; &nbsp; &nbsp; as follows:<br>
&gt;&gt; &nbsp; &nbsp; #cat /sys/class/net/eth0/operstate<br>
&gt;&gt; &nbsp; &nbsp; down<br>
&gt;&gt; &nbsp; &nbsp; #ifconfig eth0 up<br>
&gt;&gt; &nbsp; &nbsp; #cat /sys/class/net/eth0/operstate<br>
&gt;&gt; &nbsp; &nbsp; down<br>
&gt;&gt; &nbsp; &nbsp; #ficonfig eth 10.100.0.5<br>
&gt;&gt; &nbsp; &nbsp; #cat /sys/class/net/eth0/operstate<br>
&gt;&gt; &nbsp; &nbsp; down<br>
&gt;&gt; &nbsp; &nbsp; more system information is attached.(uname 、ifconfig 、lspci、<br>
&gt;&gt; &nbsp; &nbsp; cmdline...)<br>
&gt;&gt;<br>
&gt;&gt; &nbsp; &nbsp; I can&#39;t figure out the reason why the eth is still down? can<br>
&gt;&gt; &nbsp; &nbsp; anyone help me ?<br>
&gt;&gt;<br>
&gt;&gt; &nbsp; &nbsp; best regards,<br>
&gt;&gt; &nbsp; &nbsp; qinguan<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; &nbsp; &nbsp; vt_d.xml:<br>
&gt;&gt; &nbsp; &nbsp; &lt;domain type=&#39;kvm&#39;&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;name&gt;test&lt;/name&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;description&gt;just test using sriov!&lt;/description&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;os&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;type&gt;hvm&lt;/type&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;boot dev=&#39;hd&#39;/&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;/os&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;memory&gt;524288&lt;/memory&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;currentMemory&gt;524288&lt;/currentMemory&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;on_poweroff&gt;destroy&lt;/on_poweroff&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;on_reboot&gt;restart&lt;/on_reboot&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;on_crash&gt;restart&lt;/on_crash&gt;<br>
&gt;&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;features&gt;&lt;pae/&gt;&lt;acpi/&gt;&lt;apic/&gt;&lt;/features&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;clock offset=&#39;utc&#39;/&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;devices&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;input type=&#39;mouse&#39; bus=&#39;usb&#39;/&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;disk type=&#39;file&#39; device=&#39;disk&#39;&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;source file=&#39;/home/qinguan/exp/ubuntu_1.img&#39;/&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;target dev=&#39;hda&#39; bus=&#39;virtio&#39;/&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;/disk&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;emulator&gt;/usr/bin/kvm&lt;/emulator&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;graphics type=&#39;vnc&#39; port=&#39;-1&#39;/&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;hostdev mode=&#39;subsystem&#39; type=&#39;pci&#39; managed=&#39;yes&#39;&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;source&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;address bus=&#39;0x0&#39; slot=&#39;0x19&#39; function=&#39;0x0&#39;/&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;/source&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;/hostdev&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;/devices&gt;<br>
&gt;&gt; &nbsp; &nbsp; &lt;/domain&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; &nbsp; &nbsp; _______________________________________________<br>
&gt;&gt; &nbsp; &nbsp; libvirt-users mailing list<br>
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</div></div></div></div></blockquote></div><br>
</blockquote></div></div></div><br>
</blockquote></div><br>