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My CPU is Intel T9300, it supports VT-x, but it does not support VT-d. I am using Xen pvops virtualization. I have a PCI device, and my host system can work without it. So I am thinking if it is possible to pass it to my guest vm.

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Since version 3.0, Xen has provided PCI passthrough to a paravirtual (PV) guest without VT-d CPU/Motherboard extensions. A PV guest means that the guest is running a special Xen kernel that is aware of the hypervisor. Xen PV guest kernels exist for Linux, NetBSD, FreeBSD, OpenSolaris and Novell Netware operating systems.

Xen cannot provide PCI passthrough to a HVM (fully virtualized) guest without VT-d. An example of an HVM guest would be Windows.

This wiki entry discusses Xen PCI passthrough.

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  • It is technically possible actually. Years ago there was the "NativeDom" patch (based on the original passthrough work by Neocleus) that allowed the thing to work on HVM even in the IOMMU-less scenario, albeit with a couple of limitations. Not sure what it has been of it.
    – mirh
    Mar 24 '20 at 17:09

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