[Libvirt-announce] Release of libvirt-6.0.0
veillard at redhat.com
Wed Jan 15 15:34:57 UTC 2020
As planned the release is available, tagged in git, and the signed
tarball and source rpm are available from the usual place:
I also made the release of the pythn bindings which can be found at:
This release carries some serious changes, dropping the support for python2
and the phyp Power Hypervisor. This comes with a set of new features and
- support for python2 is removed
Libvirt is no longer able to be built using the Python 2 binary. Python
3 must be used instead.
- docs: the python docutils toolset is now required
The use of rst2html has been introduced for the website build process
since docs are now being written in the RST as an alternative to HTML.
- new PCI hostdev address type: unassigned
A new PCI hostdev address type 'unassigned' is introduced. An
unassigned PCI hostdev behaves like any regular PCI hostdev inside
Libvirt, but it is not usable by the guest. This gives the user a new
option to manage the binding of PCI devices via Libvirt, declaring PCI
hostdevs in the domain XML but allowing just a subset of them to be
assigned to the guest.
- Provide init scripts for sub-deaemons
So far libvirt shipped systemd unit files for sub-daemons. With this
release, init scripts are available too. Package maintainers can choose
which one to install via --with-init-script configure option.
- qemu: Support cold-unplug of sound devices
- qemu: Implement VIR_MIGRATE_PARAM_TLS_DESTINATION
This flag, which can be enabled using virsh's --tls-destination option,
allows migration to succeed in situations where there is a mismatch
between the destination's hostname and the information stored in its
- qemu: Support reporting memory bandwidth usage stats
Implement Intel RDT-MBM in libvirt. The stats can be obtained via virsh
- qemu: Allow accessing NVMe disks directly
Before this release there were two ways to configure a NVMe disk for a
domain. The first was using <disk/> with the <source/> pointing to the
/dev/nvmeXXXX. The other was using PCI assignment via <hostdev/>
element. Both have their disadvantages: the former adds latency of file
system and block layers of the host kernel, the latter prohibits domain
migration. In this release the third way of configuring NVMe disk is
added which combines the advantages and drops disadvantages of the
previous two ways. It's accessible via <disk type='nvme'/>.
- 'phyp' Power Hypervisor driver removed
The 'phyp' Power Hypervisor driver has not seen active development
since 2011 and does not seem to have any real world usage. It has now
- qemu: xz save image compression is faster
When using the xz format to compressed virtual machine saved state
images, the "-3" compression level preset is now used. This results in
slightly larger files, but with a massively reduced time to compress.
The xz format offers the best compression level for saved state images,
albeit still with the slowest running time. For the fastest possible
running time, at cost of the larest compressed size, lzop should be
- domain: Improve job stat handling
It is now possible to retrieve stats for completed and failed jobs.
- qemu: Don't hold monitor and agent job at the same time
Before this change, a malicious (or buggy) qemu-guest-agent running in
the guest could make other libvirt APIs unavailable for an unbounded
amount of time.
- qemu: Report error if backing image format is not specified explicitly
For a long time libvirt was assuming that a backing file is RAW when
the format was not specified. This didn't pose a problem until blockdev
support was enabled in last release. Libvirt now requires that the
format is specified in the image metadata or domain XML and the VM will
refuse to start otherwise. Additionally the error message now links to
the knowledge base which summarizes how to fix the images.
- qemu: Fix non-shared storage migration over NBD
- qemu: Generate a single MAC address for hotplugged network devices
Since libvirt 4.6.0, when hotplugging a network device that didn't have
a MAC address already assigned by the user, two separate addresses
would be generated: one for the live configuration, which would show up
immediately, and one for the inactive configuration, which would show
up after the first reboot. This situation was clearly undesirable, so a
single MAC address is now generated and used both for the live
configuration and the inactive one.
thanks everybody who helped on this release, with reports, fixes,
reviews, ideas, documentation, etc ...
Enjoy the release, next one will be scheduled at the end of
Daniel Veillard | Red Hat Developers Tools http://developer.redhat.com/
veillard at redhat.com | libxml Gnome XML XSLT toolkit http://xmlsoft.org/
http://veillard.com/ | virtualization library http://libvirt.org/
More information about the Libvirt-announce