Problem Passthrough AVM GmbH Fritz!Card PCI v2.0 ISDN with PCIe to PCI Adapter

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I have a AVM GmbH Fritz!Card PCI v2.0 ISDN and I want to passthrough the card to Windows but I got a error.

I googled this error but don't find a solution. Hopefully you can help me.


"Failed to set up TRIGGER eventfd signaling for interrupt INTX-0: VFIO_DEVICE_SET_IRQS failure: Device or resource busy"





I tried different PCIe ACS override settings but no change.


VMS Error attached.






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Try installing the adapter+card in different PCI-e slots.


I've noticed the IRQ sharing actually comes into play with legacy PCI devices and passthrough.


Its also possible this device is simply not going to get along with PCI passthrough, not all of them do.


I think there is also an option in VM settings for "allow unsafe interrupts". I've never used it and am not sure what it does but it might be worth a shot.

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