Cloud Hypervisor v0.11.0 Released!
Posted October 29, 2020 by Cloud Hypervisor Team ‐ 3 min read
This release has been tracked through the 0.11.0 project.
cloud-hypervisor version 0.11.0 include:
io_uring support by default for
Provided that the host OS supports it (Linux kernel 5.8+) then
be used for a significantly higher performance block device.
Windows Guest Support
This is the first release where we officially support Windows running as a guest. Full details of how to setup the image and run Cloud Hypervisor with a Windows guest can be found in the dedicated Windows documentation.
vhost-user “Self Spawning” Deprecation
Automatically spawning a
vhost-user-block backend is now
deprecated. Users of this functionality will receive a warning and should make
adjustments. The functionality will be removed in the next release.
Support for using the
virtio-mmio transport, rather than using PCI, has been
removed. This has been to simplify the code and significantly
reduce the testing burden of the project.
Snapshot/Restore support for ARM64
When running on the ARM64 architecture snapshot and restore has now been implemented.
Improved Linux Boot Time
The time to boot the Linux kernel has been significantly improved by the identifying some areas of delays around PCI bus probing, IOAPIC programming and MPTABLE issues. Full details can be seen in #1728.
SIGTERM/SIGINT Interrupt Signal Handling
When the VMM process receives the
SIGINT signals then it will
trigger the VMM process to cleanly deallocate resources before exiting. The
guest VM will not be cleanly shutdown but the VMM process will clean up its
Default Log Level Changed
The default logging level was changed to include warnings which should make it easier to see potential issues. New logging documentation was also added.
--balloon Parameter Added
Control of the setup of
virtio-balloon has been moved from
--memory to its
own dedicated parameter. This makes it easier to add more balloon specific
controls without overloading
Support for using a new
virtio-watchdog has been added which can be used to
have the VMM reboot the guest if the guest userspace fails to ping the
watchdog. This is enabled with
--watchdog and requires kernel support.
Notable Bug Fixes
- MTRR bit was missing from CPUID advertised to guest
- “Return” key could not be used under
CMD.EXEunder Windows SAC (#1170)
- CPU identification string is now exposed to the guest
discard_writes=onno longer marks the guest memory as read only so avoids excessive VM exits (#1795)
- PCI device hotplug after an unplug was fixed (#1802)
- When using the ACPI method to resize the guest memory the full reserved size can be used (#1803)
- Snapshot and restore followed by a second snapshot and restore now works correctly
- Snapshot and restore of VMs with more than 2GiB in one region now work correctly
Many thanks to everyone who has contributed to our 0.11.0 release including some new faces.
- Anatol Belski firstname.lastname@example.org
- Bo Chen email@example.com
- Daniel Verkamp firstname.lastname@example.org
- Henry Wang Henry.Wang@arm.com
- Hui Zhu email@example.com
- Jiangbo Wu firstname.lastname@example.org
- Josh Soref email@example.com
- Julio Montes firstname.lastname@example.org
- Michael Zhao email@example.com
- Muminul Islam firstname.lastname@example.org
- pierwill email@example.com
- Praveen Paladugu firstname.lastname@example.org
- Rob Bradford email@example.com
- Sebastien Boeuf firstname.lastname@example.org
- Wei Liu email@example.com
See the GitHub Release for the release assets.