Tags · 0x88888888/cloud-hypervisor

v0.9.0

This release has been tracked through the 0.9.0 project.

Highlights for cloud-hypervisor version 0.9.0 include:

io_uring Based Block Device Support
----------------------------------

If the io_uring feature is enabled and the host kernel supports it then
io_uring will be used for block devices. This results a very significant
performance improvement.

Block and Network Device Statistics
-----------------------------------

Statistics for activity of the virtio network and block devices is now
exposed through a new vm.counters HTTP API entry point. These take the
form of simple counters which can be used to observe the activity of the
VM.

HTTP API Responses
------------------

The HTTP API for adding devices now responds with the name that was
assigned to the device as well the PCI BDF.

CPU Topology
------------

A topology parameter has been added to --cpus which allows the
configuration of the guest CPU topology allowing the user to specify the
numbers of sockets, packages per socket, cores per package and threads
per core.

Release Build Optimization
--------------------------

Our release build is now built with LTO (Link Time Optimization) which
results in a ~20% reduction in the binary size.

Hypervisor Abstraction
----------------------

A new abstraction has been introduced, in the form of a hypervisor crate
so as to enable the support of additional hypervisors beyond KVM.

Snapshot/Restore Improvements
-----------------------------

Multiple improvements have been made to the VM snapshot/restore support
that was added in the last release. This includes persisting more vCPU
state and in particular preserving the guest paravirtualized clock in
order to avoid vCPU hangs inside the guest when running with multiple
vCPUs.

Virtio Memory Ballooning Support
--------------------------------

A virtio-balloon device has been added, controlled through the resize
control, which allows the reclamation of host memory by resizing a
memory balloon inside the guest.

Enhancements to ARM64 Support
-----------------------------

The ARM64 support introduced in the last release has been further
enhanced with support for using PCI for exposing devices into the guest
as well as multiple bug fixes. It also now supports using an initramfs
when booting.

Intel SGX Support
-----------------

The guest can now use Intel SGX if the host supports it. Details can be
found in the dedicated SGX documentation.

Seccomp Sandbox Improvements
----------------------------

The most frequently used virtio devices are now isolated with their own
seccomp filters. It is also now possible to pass --seccomp=log which
result in the logging of requests that would have otherwise been denied
to further aid development.

Notable Bug Fixes
-----------------

* Our virtio-vsock implementation has been resynced with the
implementation from Firecracker and includes multiple bug fixes. CPU
hotplug has been fixed so that it is now possible to add, remove, and
re-add vCPUs (cloud-hypervisor#1338)
* A workaround is now in place for when KVM reports MSRs available MSRs
that are in fact unreadable preventing snapshot/restore from working
correctly (cloud-hypervisor#1543).
* virtio-mmio based devices are now more widely tested (cloud-hypervisor#275).
* Multiple issues have been fixed with virtio device configuration
(cloud-hypervisor#1217)
* Console input was wrongly consumed by both virtio-console and the
serial. (cloud-hypervisor#1521)

Contributors
------------

Many thanks to everyone who has contributed to our 0.9.0 release including some new faces.

* Anatol Belski [email protected]
* Bo Chen [email protected]
* Dr. David Alan Gilbert [email protected]
* Henry Wang [email protected]
* Howard Zhang [email protected]
* Hui Zhu [email protected]
* Jianyong Wu [email protected]
* Jose Carlos Venegas Munoz [email protected]
* LiYa'nan [email protected]
* Michael Zhao [email protected]
* Muminul Islam [email protected]
* Praveen Paladugu [email protected]
* Ricardo Koller [email protected]
* Rob Bradford [email protected]
* Samuel Ortiz [email protected]
* Sebastien Boeuf [email protected]
* Stefano Garzarella [email protected]
* Wei Liu [email protected]

Aug 6, 2020
d714cf8
zip
tar.gz

v0.8.0

v0.8.0

This release has been tracked through the [0.8.0 project](https://github.com/cloud-hypervisor/cloud-hypervisor/projects/10).

Highlights for `cloud-hypervisor` version 0.8.0 include:

Experimental Snapshot and Restore Support
-----------------------------------------

This release includes the first version of the snapshot and restore feature.
This allows a VM to be paused and then subsequently snapshotted. At a later
point that snapshot may be restored into a new running VM identical to the
original VM at the point it was paused.

This feature can be used for offline migration from one VM host to another, to
allow the upgrading or rebooting of the host machine transparently to the guest
or for templating the VM. This is an experimental feature and cannot be used on
a VM using passthrough (VFIO) devices. Issues with SMP have also been observed
(cloud-hypervisor#1176).

Experimental ARM64 Support
--------------------------

Included in this release is experimental support for running on ARM64.
Currently only `virtio-mmio` devices and a serial port are supported. Full
details can be found in the [ARM64 documentation](docs/arm64.md).

Support for Using 5-level Paging in Guests
------------------------------------------

If the host supports it the guest is now enabled for 5-level paging (aka LA57).
This works when booting the Linux kernel with a vmlinux, bzImage or firmware
based boot. However booting an ELF kernel built with `CONFIG_PVH=y` does not
work due to current limitations in the PVH boot process.

Virtio Device Interrupt Suppression for Network Devices
-------------------------------------------------------

With `virtio-net` and `vhost-user-net` devices the guest can suppress
interrupts from the VMM by using the `VIRTIO_RING_F_EVENT_IDX` feature. This
can lead to an improvement in performance by reducing the number of interrupts
the guest must service.

`vhost_user_fs` Improvements
----------------------------

The implementation in Cloud Hypervisor of the VirtioFS server now supports sandboxing itself with `seccomp`.

Notable Bug Fixes
-----------------

* VMs that have not yet been booted can now be deleted (cloud-hypervisor#1110).
* By creating the `tap` device ahead of creating the VM it is not required to
  run the `cloud-hypervisor` binary with `CAP_NET_ADMIN` (cloud-hypervisor#1273).
* Block I/O via `virtio-block` or `vhost-user-block` now correctly adheres to
  the specification and synchronizes to the underlying filesystem as required
  based on guest feature negotiation. This avoids potential data loss (cloud-hypervisor#399,
  cloud-hypervisor#1216).
* When booting with a large number of vCPUs then the ACPI table would be
  overwritten by the SMP `MPTABLE`. When compiled with the `acpi` feature the
  `MPTABLE` will no longer be generated (cloud-hypervisor#1132).
* Shutting down VMs that have been paused is now supported (cloud-hypervisor#816).
* Created socket files are deleted on shutdown (cloud-hypervisor#1083).
* Trying to use passthrough devices (VFIO) will be rejected on `mmio` builds
  (cloud-hypervisor#751).

Command Line and API Changes
----------------------------

This is non exhaustive list of HTTP API and command line changes:

* All user visible socket parameters are now consistently called `socket`
  rather than `sock` in some cases.
* The `ch-remote` tool now shows any error message generated by the VMM
* The `wce` parameter has been removed from `--disk` as the feature is always
  offered for negotiation.
* `--net` has gained a `host_mac` option that allows the setting of the MAC
  address for the `tap` device on the host.

Contributors
------------

Many thanks to everyone who has contributed to our 0.8.0 release including some new faces.

* Anatol Belski <[email protected]>
* Arron Wang <[email protected]>
* Bo Chen <[email protected]>
* Dr. David Alan Gilbert <[email protected]>
* Henry Wang <[email protected]>
* Hui Zhu <[email protected]>
* LiYa'nan <[email protected]>
* Michael Zhao <[email protected]>
* Rob Bradford <[email protected]>
* Samuel Ortiz <[email protected]>
* Sebastien Boeuf <[email protected]>
* Sergio Lopez <[email protected]>

Jun 11, 2020
52b8396
zip
tar.gz

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Tags: 0x88888888/cloud-hypervisor