Xen 4.21 is out today as the newest feature release for this open-source hypervisor backed by AMD, Arm, AWS, and other organizations. Plus with Xen's use within automotive environments, Ford and Honda too.
Xen 4.21 ships with formally supporting the qemu-xen device models inside a Linux stub domain, which is a win for the likes of QubesOS.
For those using Xen on AMD hardware, there is now AMD CPU driver support for ACPI Collaborative Processor Performance Control (CPPC) for better power efficiency on Zen 3 and newer EPYC/Ryzen systems.
Xen also now supports Resizable BARs (ReBAR) for PVH Dom0 for exposing larger memory regions and better I/O efficiency.
Xen logo
Xen 4.21 also brings a new PDX compression algorithm for lowering the hypervisor memory footprint. Xen 4.21 also brings various improvements to the Arm and RISC-V CPU support.
More details on today's Xen 4.21 release via the Linux Foundation press release and XenProject.org.