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blog: Add release v40.0
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Signed-off-by: Rob Bradford <[email protected]>
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---
title: "Cloud Hypervisor v40.0 Released!"
date: 2024-06-21T11:12:02Z
draft: false
contributors: [Cloud Hypervisor Team]
---
This release has been tracked in our [roadmap
project](https://github.com/orgs/cloud-hypervisor/projects/6) as iteration
v40.0. The following user visible changes have been made:

### Support for Restoring File Descriptor Backed Network Devices

It is now possible to pass file descriptors over the HTTP API (and using
`ch-remote`) when restoring to update the file descriptors for network devices.
This enables snapshot & restore functionality for guests using `macvtap` or
other file descriptor backed network devices. (#6286)

### Notable Bug Fixes

* Default values have been removed from required fields in the OpenAPI metadata
(#6495)
* The help syntax of `ch-remote remove-device` has been improved (#6456)
* A double close of file descriptors has been fixed when using `--serial`
(#6486)
* To prevent loops a limit on the nesting level for QCOW2 backing files has
been introduced (#6482)
* Boot time performance has been improved with multiple cores by avoiding
`cpuid` instructions and by seeding the in kernel file descriptor table
(#6498, #6478)
* L1 cache details are more likely to be propagated into the guest (#6523)
* The default topology for guests now uses multiple cores rather than sockets
(#6504)

### Contributors

Many thanks to everyone who has contributed to our release:

* Alexandru Matei <[email protected]>
* Bo Chen <[email protected]>
* Jinank Jain <[email protected]>
* Josh Soref <[email protected]>
* Muminul Islam <[email protected]>
* Nuno Das Neves <[email protected]>
* Omer Faruk Bayram <[email protected]>
* Praveen K Paladugu <[email protected]>
* Purna Pavan Chandra <[email protected]>
* Rob Bradford <[email protected]>
* SamrutGadde <[email protected]>
* Sean Banko <[email protected]>
* Songqian Li <[email protected]>
* Wei Liu <[email protected]>
* Yi Wang <[email protected]>
* Yu Li <[email protected]>
### Download
See the <a href="https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v40.0">GitHub Release</a> for the release assets.

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