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⇱ Cloud Hypervisor 51 Brings Performance Improvements, Better QCOW2 v3 Support - Phoronix


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Cloud Hypervisor 51 Brings Performance Improvements, Better QCOW2 v3 Support

Written by Michael Larabel in Virtualization on 20 February 2026 at 06:06 AM EST. 3 Comments
Cloud Hypervisor 51 is now available for this Rust-based VMM focused on secure cloud computing. For what began as an Intel open-source project years ago is continuing to be largely led by Microsoft, Cyberus Tech, Tencent, Ant Group, and others.

The Cloud Hypervisor 51 release delivers on better performance with now supporting Transparent Huge Pages for anonymous shared memory and the vhost-user-net device should be operating faster. The new Cloud Hypervisor release also has many QCOW2 v3 improvements for that virtual machine disk image format. The QCOW2 v3 support now can handle live disk resize, dirty bit, RAW backing file support for QCOW2 overlays, corrupt bit detection and marking, and other features.

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Cloud Hypervisor 51 also brings ACPI Generic Initiator support, Microsoft MSHV support improvements, and various bug fixes.

Downloads and more details on the Cloud Hypervisor 51 release from overnight can be found via GitHub.

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.