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Re: [libvirt] pci device passthrough: Failed to assign irq



I also check the VM dmesg ,it shows that "Failed to initialize MSI interrupts. Falling back to legacy interrupts."
more detail information please look into the picture attached.

best regards,
qinguan


2011/5/4 guan qin <qinguan0619 gmail com>
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>


Attachment: Screenshot.png
Description: PNG image


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