Cloud Hypervisor v0.6.0 Released!

Posted March 20, 2020 by Cloud Hypervisor Team ‐ 2 min read


This release has been tracked through the 0.6.0 project.

Highlights for cloud-hypervisor version 0.6.0 include:

Directly Assigned Devices Hotplug

We continued our efforts around supporting dynamically changing the guest resources. After adding support for CPU and memory hotplug, Cloud Hypervisor now supports hot plugging and hot unplugging directly assigned (a.k.a. VFIO) devices into an already running guest. This closes the features gap for providing a complete Kata Containers workloads support with Cloud Hypervisor.

Shared Filesystem Improvements

We enhanced our shared filesystem support through many virtio-fs improvements. By adding support for DAX, parallel processing of multiple requests, FS_IO, LSEEK and the MMIO virtio transport layer to our vhost_user_fs daemon, we improved our filesystem sharing performance, but also made it more stable and compatible with other virtio-fs implementations.

Block and Networking IO Self Offloading

When choosing to offload the paravirtualized block and networking I/O to an external process (through the vhost-user protocol), Cloud Hypervisor now automatically spawns its default vhost-user-blk and vhost-user-net backends into their own, separate processes. This provides a seamless parvirtualized I/O user experience for those who want to run their guest I/O into separate executions contexts.

Command Line Interface

More and more Cloud Hypervisor services are exposed through the Rest API and thus only accessible via relatively cumbersome HTTP calls. In order to abstract those calls into a more user friendly tool, we created a Cloud Hypervisor Command Line Interface (CLI) called ch-remote. The ch-remote binary is created with each build and available e.g. at cloud-hypervisor/target/debug/ch-remote when doing a debug build.

Please check ch-remote --help for a complete description of all available commands.

PVH Boot

In addition to the traditional Linux boot protocol, Cloud Hypervisor now supports direct kernel booting through the PVH ABI.


With the 0.6.0 release, we are welcoming a few new contributors. Many thanks to them and to everyone that contributed to this release:


See the GitHub Release for the release assets.