content: blog: Release v48.0

content/en/blog/v48.0/index.md

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+---
+title: "Cloud Hypervisor v48.0 Released!"
+date: 2025-09-12T23:05:40Z
+draft: false
+contributors: [Cloud Hypervisor Team]
+---
+This release has been tracked in [v48.0 group](https://github.com/orgs/cloud-hypervisor/projects/6/views/4?filterQuery=release%3A%22Release+48%22) of our [roadmap project](https://github.com/orgs/cloud-hypervisor/projects/6/).
+
+### Experimental `fw_cfg` Device Support
+
+This feature enables passing configuration data and files, such as VM
+boot configurations (kernel, kernel cmdline, e820 memory map, and ACPI
+tables), from the host to the guest. (#7117)
+
+### Experimental `ivshmem` Device Support
+
+Support for inter-VM shared memory has been added. For more information,
+please refer to the [ivshmem documentation](docs/ivshmem.md). (#6703)
+
+### Firmware Boot Support on `riscv64`
+
+In addition to direct kernel boot, firmware boot support has been added
+on `riscv64` hosts. (#7249)
+
+### Increased vCPU Limit on x86_64/kvm
+
+The maximum number of supported vCPUs on x86_64 hosts using KVM has been
+raised from 254 to 8192. (#7299)
+
+### Improved Block Performance with Small Block Sizes
+
+Performance for `virtio-blk` with small block sizes (16KB and below)
+is enhanced via submitting async IO requests in batches. (#7146)
+
+### Faster VM Pause Operation
+
+The VM pause operation now is significantly faster particularly for VMs
+with a large number of vCPUs. (#7290)
+
+### Updated Documentation on Windows Guest Support
+
+Our Windows documentation now includes instructions to run Windows 11
+guests, in addition to Windows Server guests. (#7218)
+
+### Policy on AI Generated Code
+
+We will decline any contributions known to contain contents generated or
+derived from using Large Language Models (LLMs). Details can be found
+in our [contributing documentation](CONTRIBUTING.md). (#7162)
+
+### Removed SGX Support
+
+The SGX support has been removed, as announced in the deprecation notice two
+release cycles ago. (#7093)
+
+### Notable Bug Fixes
+
+* Seccomp filter fixes with glibc v2.42 (#7327)
+* Various fixes related to  (#7331, #7334, #7335)
+
+### Contributors
+
+Many thanks to everyone who has contributed to our release:
+
+*  Alex Orozco <alexorozco@google.com>
+*  Alyssa Ross <hi@alyssa.is>
+*  Anirudh Rayabharam <anrayabh@microsoft.com>
+*  Bo Chen <bchen@crusoe.ai>
+*  Demi Marie Obenour <demiobenour@gmail.com>
+*  Lucas Grosche <lucas.grosche@cyberus-technology.de>
+*  Muminul Islam <muislam@microsoft.com>
+*  Oliver Anderson <oliver.anderson@cyberus-technology.de>
+*  Peter Oskolkov <posk@google.com>
+*  Philipp Schuster <philipp.schuster@cyberus-technology.de>
+*  Ruoqing He <heruoqing@iscas.ac.cn>
+*  Shubham Chakrawar <schakrawar@crusoe.ai>
+*  Songqian Li <sionli@tencent.com>
+*  Wei Liu <liuwe@microsoft.com>
+### Download
+ See the <a href="https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v48.0">GitHub Release</a> for the release assets.