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⇱ Xen 4.20 Hypervisor Released With AMD Zen 5 Support, More Performance Optimizations - Phoronix

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Xen 4.20 Hypervisor Released With AMD Zen 5 Support, More Performance Optimizations

Written by Michael Larabel in Virtualization on 5 March 2025 at 10:06 AM EST. 7 Comments
The Xen Project announced the availability today of the Xen 4.20 virtualization hypervisor.

Xen 4.20 brings many notable improvements and performance optimizations. Some of the key takeaways for Xen 4.20 include:

- Security and performance enhancements within the core hypervisor code.

- Xen 4.20 brings support for AMD Zen 5 CPU cores across the Ryzen 9000, Ryzen AI 300, and EPYC 9005 series hardware. This Zen 5 support includes mitigation handling for the SRSO vulnerability.

- Xen 4.20 on Intel CPUs now supports the Paging-Write feature for more efficient monitoring of guest page table updates.

- Removed support for Intel Xeon Phi processors.

- Experimental support for the Armv8-R ISA.

- Xen 4.20 on RISC-V brings enhanced Device Tree mapping and memory management initialization.

- Xen 4.20 enables Undefined Behavior Sanitizer (UBSAN) support across x86/x86_64, ARM64, RISC-V, and PowerPC within the GitLab continuous integration (CI) testing.

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More details on today's Xen 4.20 release via the LinuxFoundation.org announcement.

Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via MichaelLarabel.com.