content: blog: Release v50.0

content/en/blog/v50.0/index.md

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+---
+title: "Cloud Hypervisor v50.0 Released!"
+date: 2025-12-19T03:04:36Z
+draft: false
+contributors: [Cloud Hypervisor Team]
+---
+This release has been tracked in [v50.0 group](https://github.com/orgs/cloud-hypervisor/projects/6/views/6?filterQuery=release%3A%22Release+50%22) of our [roadmap project](https://github.com/orgs/cloud-hypervisor/projects/6/).
+
+### Configurable Nested Virtualization Option on x86_64
+
+The `nested=on|off` option has been added to `--cpu` to allow users
+to configure nested virtualization support in the guest on x86_64
+hosts (for both KVM and MSHV). The default value is `on` to maintain
+consistency with existing behavior. (#7408)
+
+### Compression Support for QCOW2
+
+QCOW2 support has been extended to handle compression clusters based on
+zlib and zstd. (#7462)
+
+### Notable Performance Improvements
+
+Performance of live migration has been improved via an optimized
+implementation of dirty bitmap maintenance. (#7468)
+
+### Live Disk Resizing Support for Raw Images
+
+The `/vm.resize-disk` API has been introduced to allow users to resize block
+devices backed by raw images while a guest is running. (#7476)
+
+### Developer Experience Improvements
+
+Significant improvements have been made to developer experience and
+productivity. These include a simplified root manifest, codified and
+tightened Clippy lints, and streamlined workflows for `cargo clippy` and
+`cargo test`. (#7489)
+
+### Improved File-level Locking Support
+
+Block devices now use byte-range advisory locks instead of whole-file
+locks. While both approaches prevent multiple Cloud Hypervisor instances
+from simultaneously accessing the same disk image with write
+permissions, byte-range locks provide better compatibility with network
+storage backends. (#7494)
+
+### Logging Improvements
+
+Logs now include event information generated by the event-monitor
+module. (#7512)
+
+### Notable Bug Fixes
+
+* Fix several issues around CPUID in the guest (#7485, #7495, #7508)
+* Fix snapshot/restore for Windows Guest (#7492)
+* Respect queue size in block performance tests (#7515)
+* Fix several Serial Manager issues (#7502)
+* Fix several seccomp violation issues (#7477, #7497, #7518)
+* Fix various issues around block and qcow (#7526, #7528, #7537, #7546,
+  #7549)
+* Retrieve MSRs list correctly on MSHV (#7543)
+* Fix live migration (and snapshot/restore) with AMX state (#7534)
+
+### Contributors
+
+Many thanks to everyone who has contributed to our release:
+
+* Anatol Belski <anbelski@linux.microsoft.com>
+* Anirudh Rayabharam <anrayabh@microsoft.com>
+* Bo Chen <bchen@crusoe.ai>
+* Changyuan Lyu <changyuanl@google.com>
+* Chengyu Fu <chengyu.fu@linux.alibaba.com>
+* Connor Brewster <cbrewster@hey.com>
+* Demi Marie Obenour <demiobenour@gmail.com>
+* Eugene Korenevsky <ekorenevsky@aliyun.com>
+* Julian Stecklina <julian.stecklina@cyberus-technology.de>
+* Matt Moriarity <matt@mattmoriarity.com>
+* Muminul Islam <muislam@microsoft.com>
+* Oliver Anderson <oliver.anderson@cyberus-technology.de>
+* Pascal Scholz <pascal.scholz@cyberus-technology.de>
+* Philipp Schuster <philipp.schuster@cyberus-technology.de>
+* Praveen K Paladugu <prapal@linux.microsoft.com>
+* Rob Bradford <rbradford@rivosinc.com>
+* Sebastien Boeuf <seb@rivosinc.com>
+* Songqian Li <sionli@tencent.com>
+* Stefan Nürnberger <stefan.nuernberger@cyberus-technology.de>
+* Thomas Prescher <thomas.prescher@cyberus-technology.de>
+* Wei Liu <liuwe@microsoft.com>
+### Download
+ See the <a href="https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v50.0">GitHub Release</a> for the release assets.