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[libvirt] pci device passthrough: Failed to assign irq



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

 I look into the qemu log file ,find that :

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 127.0.0.1:0 -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
Failed to assign irq for "hostdev0": Operation not permitted
Perhaps you are assigning a device that shares an IRQ with another device?
Failed to assign irq for "hostdev0": Operation not permitted
Perhaps you are assigning a device that shares an IRQ with another device?
Failed to assign irq for "hostdev0": Operation not permitted
Perhaps you are assigning a device that shares an IRQ with another device?
Failed to assign irq for "hostdev0": Operation not permitted
Perhaps you are assigning a device that shares an IRQ with another device?
Failed to assign irq for "hostdev0": Operation not permitted

maybe the VM can't access to the network because of Failed  to assign irg for "hostdev0"?

in kern.log :
May  1 12:40:07 Optiplex-780 kernel: [ 3172.784803] e1000e 0000:00:19.0: PCI INT A disabled
May  1 12:40:07 Optiplex-780 kernel: [ 3172.784863] pci-stub 0000:00:19.0: claimed by stub
May  1 12:40:07 Optiplex-780 kernel: [ 3173.103965] pci-stub 0000:00:19.0: PCI INT A -> GSI 21 (level, low) -> IRQ 21
May  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)
May  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)
May  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)
May  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)
May  1 12:40:07 Optiplex-780 kernel: [ 3173.435751] assign device 0:0:19.0
May  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)
May  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)
May  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)
May  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)
May  1 12:44:24 Optiplex-780 kernel: [ 3430.568561] pci-stub 0000:00:19.0: PCI INT A disabled


root Optiplex-780:/var/log/libvirt/qemu# cat /proc/interrupts
           CPU0       CPU1       CPU2       CPU3      
  0:         97          1          2          1   IO-APIC-edge      timer
  1:          2          0          0          0   IO-APIC-edge      i8042
  7:          0          0          0          0   IO-APIC-edge      parport0
  8:          1          0          0          0   IO-APIC-edge      rtc0
  9:          0          0          0          0   IO-APIC-fasteoi   acpi
 12:          1          2          1          0   IO-APIC-edge      i8042
 16:          0          0          0          0   IO-APIC-fasteoi   uhci_hcd:usb2
 17:       5822       1952       3614       2233   IO-APIC-fasteoi   uhci_hcd:usb4, uhci_hcd:usb7
 18:          0          0          0          0   IO-APIC-fasteoi   uhci_hcd:usb8
 22:          1          1          1          0   IO-APIC-fasteoi   ehci_hcd:usb1, uhci_hcd:usb5
 23:       1461       1299       1153        912   IO-APIC-fasteoi   ehci_hcd:usb3, uhci_hcd:usb6
 24:     268579          0          0          0  HPET_MSI-edge      hpet2
 25:          0     286310          0          0  HPET_MSI-edge      hpet3
 26:          0          0     210675          0  HPET_MSI-edge      hpet4
 27:          0          0          0     256688  HPET_MSI-edge      hpet5
 29:          1          0          0          0  DMAR_MSI-edge      dmar1
 30:          0          0          0          0  DMAR_MSI-edge      dmar0
 31:          0          0          0          0  DMAR_MSI-edge      dmar2
 35:          0          0          0          1   PCI-MSI-edge      eth1
 36:       1456        916       1323       1657   PCI-MSI-edge      eth1-rx-0
 37:       1031        772       1459        895   PCI-MSI-edge      eth1-rx-1
 38:        958        965        785        470   PCI-MSI-edge      eth1-rx-2
 39:       1319        557       1007        714   PCI-MSI-edge      eth1-rx-3
 40:        892        864        417       1134   PCI-MSI-edge      eth1-tx-0
 41:        414        749        998        606   PCI-MSI-edge      eth1-tx-1
 42:        307        921        375        332   PCI-MSI-edge      eth1-tx-2
 43:        966        693        396        502   PCI-MSI-edge      eth1-tx-3
 54:       7109       5755       5683       5609   PCI-MSI-edge      ahci
 55:         74        105         73         84   PCI-MSI-edge      hda_intel
 56:       1446        927       1108        870   PCI-MSI-edge      i915
NMI:          0          0          0          0   Non-maskable interrupts
LOC:        740        725        703        677   Local timer interrupts
SPU:          0          0          0          0   Spurious interrupts
PMI:          0          0          0          0   Performance monitoring interrupts
PND:          0          0          0          0   Performance pending work
RES:        665        679        714        547   Rescheduling interrupts
CAL:       5332        408       5619        539   Function call interrupts
TLB:       1880       2843       1788       3202   TLB shootdowns
TRM:          0          0          0          0   Thermal event interrupts
THR:          0          0          0          0   Threshold APIC interrupts
MCE:          0          0          0          0   Machine check exceptions
MCP:          5          5          5          5   Machine check polls
ERR:          3
MIS:          0
root Optiplex-780:/var/log/libvirt/qemu#

I search the similarly problems that sharing the irg  but never find a answer , and now I have no idea.
How to solve the problem  ,can you help me ? thanks.


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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