blog: Add release v40.0

Signed-off-by: Rob Bradford <[email protected]>

Author: rbradford

content/en/blog/v40.0/index.md

@@ -0,0 +1,55 @@
+---
+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.