5:05 a.m.
The 11.2.0 release of both libvirt and libvirt-python is tagged and
signed tarballs are available at
https://download.libvirt.org/
https://download.libvirt.org/python/
Thanks everybody who helped with this release by sending patches,
reviewing, testing, or providing feedback. Your work is greatly
appreciated.
* Removed features
* Remove support for qemu-6.1 and older
Libvirt now requires *qemu-6.2* or newer based on our platform support
policy.
* New features
* qemu: Add new 'image_format' parameter to virDomainSaveParams
``virDomainSaveParams`` now supports an ``image_format`` parameter for
specifying the save image format on a per-domain basis. The parameter
accepts the same values as the driver-wide ``save_image_format`` setting
in ``qemu.conf``. An image format specified via ``virDomainSaveParams``
takes precedence over the driver-wide setting.
* qemu: Added guest load averages to the output of virDomainGetGuestInfo
This feature will be available with qemu guest agent 10.0 onwards.
* qemu: Add support for multiple iothreads for ``virtio-scsi`` controller
It's now possible to map multiple iothreads to the ``virtio-scsi`` controller
or even map them to specific virtqueues similarly to the ``virtio-blk``
device allowing for better performance in certain scenarios.
* qemu: integrate support for VM shutdown on host shutdown
It is now possible to instruct the QEMU driver to automatically perform
managed save, graceful shutdown, or hard poweroff on running VMs, when a
host shutdown is requested. This feature is intended to eventually replace
usage of the libvirt-guests script. The new approach improves on the
libvirt-guests script, by proactively monitoring logind for a signal that
a host shutdown has been requested. It will initiate the chosen action on
running guests immediately, allowing shutdown inhibitors to be released
sooner. The new solution is also able to iteratively try multiple actions
until one of them succeeds in shutting down the VM.
Since it must be mutually exclusive with the libvirt-guests script, this
feature currently requires a manual opt-in through editing of the
/etc/libvirt/qemu.conf configuration file. The libvirt-guests script must
be disabled before doing this.
* qemu: Add 'sparse' as a new save image format
QEMU's ``file`` migration has been supplemented with the new stream format
``mapped-ram``, where RAM pages are mapped directly to offsets in the
migration file. ``mapped-ram`` is now supported by augmenting the existing
save image formats with the ``sparse`` format.
* qemu: Add support for parallel save/restore
The ``sparse`` image format can support reading and writing by multiple
channels. ``virDomainSaveParams`` and ``virDomainRestoreParams`` now
support specifying the number of IO channels used for parallel save and
restore. Using multiple channels can reduce the time required to save
and restore domains.
* virsh: Introduce new hypervisor-cpu-models command
Added a new virsh command ``hypervisor-cpu-models``. The command pulls from
the existing domcapabilities XML and uses xpath to parse CPU model strings.
By default, only models reported as usable by the hypervisor on the host
system are printed. A user may specify ``--all`` to also print models which
are not supported on the host.
* qemu: Introduce os/shim element
For secure boot environments where ``<loader/>`` is signed, it may be
unfeasible to keep the binary up to date (esp. when revoking certificates
contained within). To address that, new ``<shim/>`` element is introduced
which allows hypervisor to side load another UEFI binary, which can then
contain new certification authorities and/or list of revocations.
* ch: Enable SEV SNP support
Cloud Hypervisor guests can be now started with SEV SNP enabled.
* qemu: Support for Block Disk Along with Throttle Filters
Introduce support for multiple throttle groups per block disk in QEMU,
enhancing I/O control and performance optimization. This update builds
on the existing throttling functionality by allowing more granular control
with the ability to assign different throttle groups to multiple block
devices, improving shared throttling across devices.
* Improvements
* qemu: Improved guest agent corner case error reporting
The APIs using the guest agent now report two specific error codes aimed at
helping management applications/users to differentiate between timeout
while libvirt was synchronizing with the guest agent and timeout after a
command was already sent.
The new error codes are ``VIR_ERR_AGENT_COMMAND_TIMEOUT`` and
``VIR_ERR_AGENT_COMMAND_FAILED``.
* qemu: Use common check for shared memory use for ``vhost-user`` network devices
Historically libvirt printed only a warning if the ``vhost-user`` network
was misconfigured. Since we enforce proper configuration for other device
types using ``vhost-user`` it is now enforced also for network devices and
prints an actual error on misconfiguration.
* Introduce constants for discoverability of entries in bulk stats APIs
Libvirt introduced constants exposed by our API description XML which allows
discoverability of new entries in typed parameter names returned by
``virConnectGetAllDomainStats``, ``virDomainListGetStats``, and
``virDomainGetGuestInfo``.
* qemu: Reflect MAC address change in live domain XML
When a guest changes MAC address on one of its vNICs the new MAC address is
now visible in the live XML under ``currentAddress`` attribute of
``<mac/>`` element. At the same time,
``VIR_DOMAIN_EVENT_ID_NIC_MAC_CHANGE`` event is emitted so that management
applications can update their internal state.
* Bug fixes
* qemu: attach virtio-mem with CCW address
Attaching a virtio-mem device on s390 without an address type now gets a
default type CCW address assigned. A specified CCW address is now used for
the virtio-mem device instead of getting overwritten by a PCI address.
* ch: Various memory leak fixes
There were some memory leaks identified in the Cloud Hypervisor driver.
They are fixed now.
Enjoy.
Jirka