content: blog: Release v44.0

content/en/blog/v44.0/index.md

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+---
+title: "Cloud Hypervisor v44.0 Released!"
+date: 2025-02-03T19:34:45Z
+draft: false
+contributors: [Cloud Hypervisor Team]
+---
+# v44.0
+
+This release has been tracked in our [roadmap project](https://github.com/orgs/cloud-hypervisor/projects/6) as iteration
+v44.0. The following user visible changes have been made:
+
+### Configurable `virtio-iommu` Address Width
+
+The `iommu_address_width` option has been added to `--platform` to allow users
+to limit the `virtio-iommu` address space in the guest. (#6900)
+
+### Notable Performance Improvements
+
+The `VIRTIO_BLK_F_SEG_MAX` feature has been enabled for `virtio-block` devices,
+which brings significant performance improvements on throughput. (#6885)
+
+The `io_uring` entries are no longer forced to use async helper workers,
+delegating the decision to the kernel. This change resolved the issue of having
+excessive amount of worker threads when `io_uring` is being used, which is
+expected to improve performance, such as reducing memory usage and reduce CPU
+contention.
+
+### New Fuzzers
+
+Our continuous fuzzing infrastructure is augmented with two new fuzzers to cover
+x86 instruction emulator and `virtio-vsock`.
+
+### Notable Bug Fixes
+
+* Fix short read and short write that impact QCOW and VHDX support. (#6884)
+* Various bug fixes on VHDX support. (#6890, #6899)
+
+### Contributors
+
+Many thanks to everyone who has contributed to our release:
+
+* Arvind Vasudev <[email protected]>
+* Bo Chen <[email protected]>
+* Nikolay Edigaryev <[email protected]>
+* Rob Bradford <[email protected]>
+* Ruoqing He <[email protected]>
+* Wei Liu <[email protected]>
+
+# v43.0
+
+This release has been tracked in our [roadmap
+project](https://github.com/orgs/cloud-hypervisor/projects/6) as iteration
+v43.0. The following user visible changes have been made:
+
+### Live Migration over TCP Connections
+
+Support has been added to enable direct live migration from two hosts via TCP
+connections. This supplements the existing support for migrating over a UNIX
+socket which can then be tunnelled as desired. The documentation has been
+updated. (#6850)
+
+### Notable Performance Improvements
+
+The `VIRTIO_RING_F_INDIRECT_DESC` feature has been enabled for `virtio-block`
+devices. This significantly increases the throughput of the devices with a
+small negative impact on latency. (#6826)
+
+### Notable Bug Fixes
+
+* Cloud Hypervisor now accepts VFIO devices that use I/O PCI BARs on non x86-64
+  architectures. Whether they function depends on the host PCI host bridge
+  support - previously they would be rejected even if the driver did not use
+  these BARs. (#6871)
+* Command line groups were adjusted to ensure that at least one payload
+  parameter was provided if any other VM parameters provided. (#6832)
+
+### Contributors
+
+Many thanks to everyone who has contributed to our release:
+
+* Alyssa Ross <[email protected]>
+* Andrew Consroe <[email protected]>
+* Bo Chen <[email protected]>
+* Jinrong Liang <[email protected]>
+* Julian Stecklina <[email protected]>
+* Muminul Islam <[email protected]>
+* Rob Bradford <[email protected]>
+* Ruoqing He <[email protected]>
+* Wojtek Czekalski <[email protected]>
+### Download
+ See the <a href="https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v44.0">GitHub Release</a> for the release assets.