Xen VPCI Weather Report - Stewart Hildebrand, Advanced Micro Devices, Inc.

Xen VPCI Weather Report - Stewart Hildebrand, Advanced Micro Devices, Inc.

Xen vPCI has been in development for several years. vPCI is the PCI passthrough mechanism used in PCI passthrough on Arm and PVH on x86. Multiple downstreams already have PCI passthrough on Arm available in some form, and it has recently gained upstream traction. In this talk we focus on vPCI for Arm and x86, its history, current status, and future work. A PCI locking rework patch was recently accepted upstream, thanks to the work of several contributors, reviewers, and maintainers. We discuss possible methods for enabling IOREQ (e.g., Qemu-backed virtio-pci) and vPCI simultaneously. Finally, we discuss IOREQ and vPCI in a dom0less/hyperlaunch configuration.