Cloud Hypervisor v0.13.0 Released!

Posted February 12, 2021 by Cloud Hypervisor Team ‐ 2 min read

This release has been tracked through the 0.13.0 project.

Highlights for cloud-hypervisor version 0.13.0 include:

Wider VFIO device support

It is now possible to use Cloud Hypervisor’s VFIO support to passthrough PCI devices that do not support MSI or MSI-X and instead rely on INTx interrupts. Most notably this widens the support to most NVIDIA cards with the proprietary drivers.

Improve huge page support

Through the addition of hugepage_size on --memory it is now possible to specify the desired size of the huge pages used when allocating the guest memory. The user is required to ensure they have sufficient pages of the desired size in their pool.

MACvTAP support

It is now possible to provide file descriptors using the fd parameter to --net which point at TAP devices that have already been opened by the user. This aids integration with libvirt but also permits the use of MACvTAP support. This is documented in dedicated macvtap documentation.

VHD disk image support

It is now possible to use VHD (fixed) disk images as well as QCOWv2 and raw disk image with Cloud Hypervisor.

Improved Virtio device threading

Device threads are now derived from the main VMM thread which allows more restrictive seccomp filters to be applied to them. The threads also have a predictable name derived from the device id.

Clean shutdown support via synthetic power button

It is now possible to request that the guest VM shut itself down by triggering a synthetic ACPI power button press from the VMM. If the guest is listening for such an event (e.g. using systemd) then it will process the event and cleanly shut down. This functionality is exposed through the HTTP API and can be triggered via ch-remote --api-socket=<API socket> power-button.


Many thanks to everyone who has contributed to our 0.13.0 release including some new faces.


See the GitHub Release for the release assets.