Release of libvirt-10.4.0
by Jiri Denemark
The 10.4.0 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.
* New features
* qemu: Support for ras feature for virt machine type
It is now possible to set on/off ``ras`` feature in the domain XML for virt
(Arm) machine type as ``<ras state='on'/>``.
* SSH proxy for VM
Libvirt now installs a binary helper that allows connecting to QEMU domains
via SSH using the following scheme: ``ssh user@qemu/virtualMachine``.
* qemu: Support for ``virtio`` sound model
Sound devices can now be configured to use the virtio model with
``<sound model='virtio'/>``. This model is available from QEMU 8.2.0
onwards.
* network: use nftables to setup virtual network firewall rules
The network driver can now use nftables rules for the virtual
network firewalls, rather than iptables. With the standard build
options, nftables is preferred over iptables (with fallback to
iptables if nftables isn't installed), but this can be modified at
build time, or at runtime via the firewall_backend setting in
network.conf. (NB: the nwfilter driver still uses
ebtables/iptables).
* Improvements
* qemu: add zstd to supported compression formats
Extend the list of supported formats of QEMU save image by adding zstd
compression.
* qemu: Implement support for hotplugging evdev input devices
As of this release, hotplug and hotunplug of evdev ``<input/>`` devices is
supported.
* Bug fixes
* virsh/virt-admin: Fix ``--help`` option for all commands
A bug introduced in `v10.3.0 (2024-05-02)`_ caused that the attempt to print
help for any command by using the ``--help`` option in ``virsh`` and
``virt-admin`` would print::
$ virsh list --help
error: command 'list' doesn't support option --help
instead of the help output. A workaround for the affected version is to use
the help command::
$ virsh help list
* qemu: Fix ``virsh save`` and migration when storage in question is root_squashed NFS
Attempting to save a VM to a root_squash NFS mount or migrating with disks
hosted on such mount could, in some scenarios, result in error stating::
'Unknown error 255'
The bug was introduced in `v10.1.0 (2024-03-01)`_.
* qemu: Don't set affinity for isolcpus unless explicitly requested
When starting a domain, by default libvirt sets affinity of QEMU process to
all online CPUs. This also included isolated CPUs (``isolcpus=``) which is
wrong. As of this release, isolated CPUs are left untouched, unless
explicitly configured in domain XML.
* qemu_hotplug: Properly assign USB address to hotplugged usb-net device
Previously, the network device hotplug logic would try to ensure only CCW
or PCI addresses. With recent support for the usb-net model, USB addresses
for usb-net network devices are assigned automatically.
* qemu: Fix hotplug of ``virtiofs`` filesystem device with ``<boot order=`` set
The bug was introduced in `v10.3.0 (2024-05-02)`_ when attempting to reject
unsupported configurations. During hotplug the addresses are
assigned after validation and thus errorneously reject valid configs.
Enjoy.
Jirka
12 months
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