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