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
  (vmm: openapi: Remove path as required for DiskConfig #7017)
• Properly parse PCI capabilities (pci: be more robust when parsing PCI capabilities #7018)
• Reprogram PCI device BAR when its MSE bit is set (Reprogram PCI device BAR when its MSE bit is set #7063)
• Update IOMMU mappings of MMIO regions with BAR reprogram for VFIO
  devices (pci: vfio: Update IOMMU mappings of MMIO regions with BAR reprogram #7064)
• Avoid resizing VMs to zero vCPUs (Don't allow resizing VM to 0 vCPUs #7086)
• Fix extended topology enumeration leaf exposed to the guest (Fix extended topology enumeration leaf #7087)

Contributors

Many thanks to everyone who has contributed to our release:

• Bingxin Li bl497@cam.ac.uk
• Bo Chen bchen@crusoe.ai
• Fabiano Fidêncio fidencio@northflank.com
• Gregory Anders ganders@cloudflare.com
• Jinank Jain jinankjain@microsoft.com
• Julian Stecklina julian.stecklina@cyberus-technology.de
• Muminul Islam muislam@microsoft.com
• Paolo Bonzini pbonzini@redhat.com
• Philipp Schuster philipp.schuster@cyberus-technology.de
• Rob Bradford rbradford@rivosinc.com
• Ruoqing He heruoqing@iscas.ac.cn
• Thomas Prescher thomas.prescher@cyberus-technology.de
• abm-77 andrewmiller77@protonmail.com