Xen Project Developer and Design Summit 2021

PCI device passthrough capability allows XEN guests to have full access to PCI devices without modifying the guest OS. PCI devices passthrough to the guest will behave as they are physically attached to the guest and fully isolated from the host.   The goal of this work is to implement the virtual PCI bus topology through IO emulation such that only assigned devices are visible to the guest and the guest can use the standard PCI device driver without the use of PV drivers.  Only Domain-0 and XEN will have direct access to the physical PCI bus. I/O memory regions for the device will be mapped to the guest and interrupts will be redirected to the guest. IOMMU has to be configured correctly to have DMA transactions.   PCI device passthrough without the use of PV drivers will have performance benefits as PCI device assigned will behave same as physically attached to the guest.