Cloud Hypervisor v23.0 Released!

Posted April 14, 2022 by Cloud Hypervisor Team ‐ 2 min read

This release has been tracked through the v23.0 project.

vDPA Support

A vDPA device has a datapath that complies with the virtio specification but with a vendor specific control path. The addition of --vdpa and the REST API equivalent allows the use of these devices with Cloud Hypervisor.

Updated OS Support list

The list of officially supported and tested OS versions has been updated to include Ubuntu “jammy” 22.04 and EOLed versions removed.

AArch64 Memory Map Improvements

The memory map when running on AArch64 has been improved for the handling of the UEFI region which means that the booted guest OS now has full access to its allocated RAM. (#3938)

AMX Support

Under a compile time gate of amx it is possible compile in support for the AMX instruction set extension for guest use. This also requires runtime enabling with --cpu features=amx.

Notable Bug Fixes

  • Generate error when incorrect HTTP method used for some API endpoints (#3887)
  • CMOS based reset is now available to support rebooting on “jammy” (#3914)
  • ACPI tables are not produced for memory hotplug when running with virtio-mem (#3883)
  • virtio-iommu backed PCI segments are now comprehensively placed behind the vIOMMU (#3870)
  • Seccomp rules have been extended for virtio-fs to support direct access (#3848)


Deprecated features will be removed in a subsequent release and users should plan to use alternatives

  • The mergeable option from the virtio-pmem support has been deprecated (#3968)
  • The dax option from the virtio-fs support has been deprecated (#3889)


Many thanks to everyone who has contributed to our release:


See the GitHub Release for the release assets.