The 7.1.0 release of both libvirt and libvirt-python is tagged and
signed tarballs and source RPMs are available at
https://libvirt.org/sources/
https://libvirt.org/sources/python/
Thanks everybody who helped with this release by sending patches,
reviewing, testing, or providing any other feedback. Your work is
greatly appreciated.
* Portability
* Implement Apple Silicon support
libvirt now runs on the ARM-based Apple Silicon Macs.
* New features
* Introduce virtio-pmem ``<memory/>`` model
The virtio-pmem is a virtio variant of NVDIMM and just like NVDIMM
virtio-pmem also allows accessing host pages bypassing guest page cache.
* Introduce ``<boot order/>`` for ``<filesystem>``
Booting is possible from virtiofs filesystems. Introduce an option
to control the boot order, like we do for other bootable devices.
* hyperv: implement new APIs
The ``virDomainUndefine()``, ``virDomainUndefineFlags()``,
``virDomainDefineXML()``, ``virDomainAttachDevice()``, and
``virDomainAttachDeviceFlags()``, ``virConnectListAllNetworks()``,
``virConnectNumOfNetworks()``, ``virNetworkLookupByName()``,
``virNetworkLookupByUUID()``, ``virConnectNumOfDefinedNetworks()``,
``virConnectListDefinedNetworks()``, ``virNetworkGetAutostart()``,
``virNetworkIsActive()``, ``virNetworkIsPersistent()``,
``virNetworkGetXMLDesc()``, and ``virDomainScreenshot()``, APIs have been
implemented in the Hyper-V driver.
* Support <teaming> element in plain <hostdev> devices
This is useful when libvirt doesn't have the privileges necessary
to set the hostdev device's MAC address (which is a necessary
part of the alternate <interface type='hostdev'>).
* Introduce ``<disk type='vhostuser'>`` support
Introduces support for QEMU vhost-user-blk device that can be used
to access storage exported via the vhost-user protocol by daemons such
as the ``qemu-storage-daemon``.
* Bug fixes
* qemu: Fix disk quiescing rollback when creating external snapshots
If the qemu guest agent call to freeze filesystems failed when creating
an external snapshot with ``VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE`` flag the
filesystems would be unconditionally thawed. This could cause problems when
the filesystems were frozen by an explicit call to ``virDomainFSFreeze``
since the guest agent then rejects any further freeze attempts once are
filesystems frozen, an explicit freeze followed by a quiesced snapshot
would fail and thaw filesystems.
Users are also encouraged to use ``virDomainFSFreeze/Thaw`` manually instead
of relying on ``VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE`` if they need finer
grained control.
* cgroups: Fix how we setup and configure cgroups on hosts with systemd
When libvirt is running on host with systemd we register every VM with
machined which creates the VM root cgroup for us as well. Before this fix
we were directly modifying files in the VM root cgroup which was incorrect
because all the files are managed by systemd. The implication was that any
change done by libvirt to cgroup attributes supported by systemd could be
removed which happens for example by running ``systemctl daemon-reload``.
To fix the issue libvirt now uses DBus calls for some of the cgroup
attributes that distribute the resources proportionally to the cgroup
siblings and for the rest we have a new sub-cgroup that libvirt can
managed directly.
For more details why this is necessary see
`systemd cgroup <https://systemd.io/CGROUP_DELEGATION/>`_ documentation.
* qemu: Fix swtpm device with aarch64
The TPM TIS device name for x86 is ``tpm-tis``, whereas for aarch64 it is
``tpm-tis-device``. Fix the use of TPM TIS device with aarch64 by using
the proper device name when building the QEMU command line.
* libxl: Fix domain shutdown
Commit fa30ee04a2 introduced the possibility of a race between the
shutdown and death threads used to process domain shutdown and death
events from libxl. On normal domain shutdown the shutdown thread handles
all aspects of shutting down and cleaning up the domain. The death
thread is only used to handle out-of-band domain destruction and is
inhibited when domain shutdown is under libvirt's control. The race is
avoided by also inhibiting the death thread when libvirt starts the
shutdown thread.
Enjoy.
Jirka
