Re: [Qemu-discuss] Error starting domain: vfio-pci

[Gabriel Laupre]

Thank Bandan,

> Assuming you are on an intel box, have you booted your kernel with intel_iommu=on ?

Yes, I have booted my kernel with the intel_iommu=on. (I don't remember how to check that now though ^^)

> Please paste the output of dmesg | grep -e DMAR -e IOMMU ?

address@hidden ~]# dmesg | grep -e DMAR -e IOMMU

[    0.000000] ACPI: DMAR 00000000bf79e0c0 00118 (v01    AMI  OEMDMAR 00000001 MSFT 00000097)

[    0.000000] Intel-IOMMU: enabled

[    0.039149] dmar: IOMMU 0: reg_base_addr fbffe000 ver 1:0 cap c90780106f0462 ecap f020f6

[    0.550126] IOMMU 0 0xfbffe000: using Queued invalidation

[    0.550131] IOMMU: Setting RMRR:

[    0.550149] IOMMU: Setting identity map for device 0000:00:1a.0 [0xbf7ec000 - 0xbf7fffff]

[    0.550184] IOMMU: Setting identity map for device 0000:00:1a.1 [0xbf7ec000 - 0xbf7fffff]

[    0.550211] IOMMU: Setting identity map for device 0000:00:1a.2 [0xbf7ec000 - 0xbf7fffff]

[    0.550241] IOMMU: Setting identity map for device 0000:00:1a.7 [0xbf7ec000 - 0xbf7fffff]

[    0.550272] IOMMU: Setting identity map for device 0000:00:1d.0 [0xbf7ec000 - 0xbf7fffff]

[    0.550302] IOMMU: Setting identity map for device 0000:00:1d.1 [0xbf7ec000 - 0xbf7fffff]

[    0.550329] IOMMU: Setting identity map for device 0000:00:1d.2 [0xbf7ec000 - 0xbf7fffff]

[    0.550358] IOMMU: Setting identity map for device 0000:00:1d.7 [0xbf7ec000 - 0xbf7fffff]

[    0.550375] IOMMU: Setting identity map for device 0000:00:1a.0 [0xec000 - 0xeffff]

[    0.550387] IOMMU: Setting identity map for device 0000:00:1a.1 [0xec000 - 0xeffff]

[    0.550399] IOMMU: Setting identity map for device 0000:00:1a.2 [0xec000 - 0xeffff]

[    0.550410] IOMMU: Setting identity map for device 0000:00:1a.7 [0xec000 - 0xeffff]

[    0.550421] IOMMU: Setting identity map for device 0000:00:1d.0 [0xec000 - 0xeffff]

[    0.550433] IOMMU: Setting identity map for device 0000:00:1d.1 [0xec000 - 0xeffff]

[    0.550444] IOMMU: Setting identity map for device 0000:00:1d.2 [0xec000 - 0xeffff]

[    0.550458] IOMMU: Setting identity map for device 0000:00:1d.7 [0xec000 - 0xeffff]

[    0.550471] IOMMU: Prepare 0-16MiB unity mapping for LPC

[    0.550483] IOMMU: Setting identity map for device 0000:00:1f.0 [0x0 - 0xffffff]

> Why does opening /dev/vfio/vfio fail ? Can you please confirm that you have read/write permissions as the user you are trying to run ?

address@hidden ~]# cd /dev/vfio/

address@hidden vfio]# ls -la | grep vfio

crw-rw-rw-  1 root root 10, 196 May 18 11:54 vfio
The right should be okay I guess.

2015-05-19 18:54 GMT-08:00 Bandan Das <address@hidden>:

Hello Gabriel,

> On May 19, 2015, at 8:03 PM, Gabriel Laupre <address@hidden> wrote:
>
> Hello everyone,
>
> I am using a Centos 7.1 machine with the kernel 3.10.229. I want to use my host with SR-IOV to use a virtual function on my NIC as the vNIC in my new VM.
>
> I have an instance started with a old NIC using macvtap that I want to change. I am using the
> virsh edit instance-00000034
> command to edit the XML configuration to add the new device I want to attach.
…
Assuming you are on an intel box, have you booted your kernel with intel_iommu=on ?
Please paste the output of dmesg | grep -e DMAR -e IOMMU ?

> When I try to reboot the VM I get this error:
> Error starting domain: internal error: process exited while connecting to monitor: 2015-05-19T21:46:21.935043Z qemu-kvm: -device vfio-pci,host=04:10.4,id=hostdev0,bus=pci.0,addr=0x3: vfio: failed to open /dev/vfio/vfio: Operation not permitted
Why does opening /dev/vfio/vfio fail ? Can you please confirm that you have read/write permissions as the user you are trying to run ?

> 2015-05-19T21:46:21.935091Z qemu-kvm: -device vfio-pci,host=04:10.4,id=hostdev0,bus=pci.0,addr=0x3: vfio: failed to setup container for group 24
> 2015-05-19T21:46:21.935107Z qemu-kvm: -device vfio-pci,host=04:10.4,id=hostdev0,bus=pci.0,addr=0x3: vfio: failed to get group 24
> 2015-05-19T21:46:21.935135Z qemu-kvm: -device vfio-pci,host=04:10.4,id=hostdev0,bus=pci.0,addr=0x3: Device initialization failed.
> 2015-05-19T21:46:21.935157Z qemu-kvm: -device vfio-pci,host=04:10.4,id=hostdev0,bus=pci.0,addr=0x3: Device 'vfio-pci' could not be initialized
>
> total Trace here: http://sprunge.us/XZFB
>
> Any idea how to fix that?
>
> Thank you very much :)
>
> Gabriel
>