Cloud Hypervisor v46.0 Released!

Posted May 23, 2025 by Cloud Hypervisor Team ‐ 2 min read

This release has been tracked in v46.0 group of our roadmap project.

File-level Locking Support with --disk

Now file-level locking is enforced for disk images, provided by users with --disk. This ensures that only a single Cloud Hypervisor instance can obtain write access to a given disk image at any time, preventing misconfiguration and avoiding potential data corruption. (#6974)

Improved Error Reporting with VM Resizing

Instead of returning a generic error 400 (e.g. BadRequest), users now get a more specific error 429 (e.g. TooManyRequests) when a pending VM resizing is not completed. This allows users to better handle different errors, say retrying the request when applicable. (#7043)

IPv6 Address Support with --net

It is now possible to specify an IPv6 address and mask when creating a network interface with --net. (#7048)

Experimental AArch64 Support with the MSHV Hypervisor

It is now possible to start VMs on AArch64 platforms when using MSHV hypervisor. (#7055)

Deprecated SGX Support

The SGX support now is deprecated with a warning message if it being used, with the intention to remove its support from our code base in two release cycles (e.g. v48.0). (#7090)

Notable Bug Fixes

  • Remove path as required for DiskConfig from the OpenAPI spec file (#7017)
  • Properly parse PCI capabilities (#7018)
  • Reprogram PCI device BAR when its MSE bit is set (#7063)
  • Update IOMMU mappings of MMIO regions with BAR reprogram for VFIO devices (#7064)
  • Avoid resizing VMs to zero vCPUs (#7086)
  • Fix extended topology enumeration leaf exposed to the guest (#7087)

Contributors

Many thanks to everyone who has contributed to our release:

Download

See the GitHub Release for the release assets.