Hello,
I'd like to use SR-IOV for the virtualization of an XHCI host controller to passthrough to multiple VMs. Software USB passthrough is not an option in this setup, which is why I'm looking into SR-IOV.
According to the XHCI specification document (I accessed it via https://www.intel.com/content/dam/www/public/us/en/documents/technical-specifications/extensible-host-controler-interfac… ) in Section 8 "Virtualization", there should be a possibility to use SR-IOV for XHCI controllers.
I tried on a system with Intel C610 server chipset, with SR-IOV enabled (tested the SR-IOV support and it is working with an I710 network card), to use it with the XHCI controller on the Chipset, but that one doesn't show the PCI express capability for SR-IOV.
I'm wondering if there is a chipset or external XHCI controller on which SR-IOV is actually usable? Or does Linux just not show the capability although the hardware is capable? Is there support for it in the Linux drivers (it doesn't seem so at a first glance on the code)? What is the plan on proceeding with XHCI IO Virtualization in the future?
Thanks a lot for your help.
Best Regards
Felix