Fix proxmox iommu operation not permitted

In trying to passthrough some LSI SAS cards to a VM I kept receiving this error:

kvm: -device vfio-pci,host=0000:03:00.0,id=hostpci0,bus=ich9-pcie-port-1,addr=0x0,rombar=0: vfio 0000:03:00.0: failed to setup container for group 7: Failed to set iommu for container: Operation not permitted

I found on this post that the fix is to add a line to /etc/modprobe.d/vfio.conf with the following:

options vfio_iommu_type1 allow_unsafe_interrupts=1

then reboot the host. It worked in my case!

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