PCI device attachment to KVM

Banana Pi Router design BPI-R4/BPI-R4 Pro(MT7988)
1

Hello,

I am running a KVM on BPI-R4 and I need to attach the wifi interface to it. I am getting below error:

error: unsupported configuration: host doesn't support passthrough of host PCI devices.

I’ve enabled CONFIG_IOMMU_DEFAULT_PASSTHROUGH, CONFIG_MTK_IOMMU, CONFIG_VIRTIO_PCI, CONFIG_VIRTIO_MMIO, CONFIG_VFIO and CONFIG_VFIO_PCI, in kernel config and rebuild image. Problem still occurs.

I am trying to attach device with below command:

virsh attach-device wifistation --file x.xml --current &

and x.xml:

<hostdev mode='subsystem' type='pci' managed='yes'>
 <source>
  <address domain='0x0000' bus='0x00' slot='0x00' function='0x0'/>
 </source>
</hostdev>

any idea?

Thanks