Re: pci passthrough with KVM

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On Tue, Sep 28, 2010 at 2:27 AM, Inigo Losada <ilosada@xxxxxxx> wrote:
>
> We are using pci passthrough with an SCSI Adapter card. The system is:
>
> - ÂO.S: ÂUbuntu 10.04.1 LTS
> - ÂKVM Packages:
>
> kvm  Â1:84+dfsg-0ubuntu16+0.12.3+noroms+0ubuntu9.2
> kvm-pxe  5.4.4-1ubuntu1
> qemu-kvm   0.12.3+noroms-0ubuntu9.2
> libvirt-bin   Â0.7.5-5ubuntu27.2
> python-libvirt  Â0.7.5-5ubuntu27.2
> libvirt0 Â Â Â Â0.7.5-5ubuntu27.2
>
> - Kernel Â2.6.32.15+drm33.5.iommu  Ârecompiled with following options :
>
> CONFIG_DMAR=y
> CONFIG_INTR_REMAP=y
>
> - Apparmor is stopped
>
> When we started the virtual machine we obtain the following error:
>
> char device redirected to /dev/pts/3
> device: 04:04.0: driver="pci-assign" host="04:04.0"
> Failed to assign irq for "04:04.0": Operation not permitted
> Perhaps you are assigning a device that shares an IRQ with another device?

Does the device share an IRQ with another device? If not, does it
work if you launch qemu manually with sudo? Â It might be that the
kernel and tool set aren't new enough to fully support running a
de-privileged guest with device assignment. Thanks,

Alex
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