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libvirt/docs/news.xml
Michal Privoznik 8a8961da36 news: Document init scripts 
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
2019-12-16 10:31:18 +01:00

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<?xml version="1.0"?>
<!-- libvirt release notes
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of the release notes.
Keep the style consistent with existing entries as much as possible.
Each change should be documented by a short, one-sentence summary, which
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This file is validated against docs/news.rng schema.
Use the following template to add a new release section:
<release version="FIXME" date="unreleased">
<section title="New features">
</section>
<section title="Improvements">
</section>
<section title="Bug fixes">
</section>
</release>
If relevant for a given release, add a section for these too:
<section title="Packaging changes">
</section>
<section title="Removed features">
</section>
<section title="Security">
</section>
-->
<libvirt>
<release version="v6.0.0" date="unreleased">
<section title="New features">
<change>
<summary>
docs: the python docutils toolset is now required
</summary>
<description>
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.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
qemu: xz save image compression is faster
</summary>
<description>
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 used.
</description>
</change>
</section>
<section title="Bug fixes">
</section>
<section title="Removed features">
<change>
<summary>
support for python2 is removed
</summary>
<description>
Libvirt is no longer able to be built using the
Python 2 binary. Python 3 must be used instead.
</description>
</change>
</section>
</release>
<release version="v5.10.0" date="2019-12-02">
<section title="New features">
<change>
<summary>
qemu: Introduce support for ARM CPU features
</summary>
<description>
The only features supported at the moment are SVE vector lengths,
which were introduced in QEMU 4.2.0.
</description>
</change>
<change>
<summary>
qemu: Support boot display for GPU mediated devices
</summary>
<description>
Until now, GPU mediated devices generally did not show any output
until the guest OS had initialized the vGPU. By specifying the
<code>ramfb</code> attribute, QEMU can be configured to use ramfb as
a boot display for the device: this allows for display of firmware
messages, boot loader menu, and other output before the guest OS has
initialized the vGPU.
</description>
</change>
<change>
<summary>
Add API to change the response timeout for guest agent commands
</summary>
<description>
By default, when a command is sent to the guest agent, libvirt waits
forever for a response from the guest agent. If the guest is
unresponsive for any reason, this can block the calling thread
indefinitely. By setting a custom timeout using
<code>virDomainAgentSetResponseTimeout()</code>, API users can change
this behavior.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
Devices CGroup v2 support
</summary>
<description>
Libvirt supported all controllers of CGroup v2 but the devices
controller which is implemented in this release.
</description>
</change>
<change>
<summary>
Cold plug of sound device
</summary>
<description>
The QEMU driver now can handle cold plug of
<code>&lt;sound/&gt;</code> devices.
</description>
</change>
<change>
<summary>
Probe for default CPU types
</summary>
<description>
With QEMU 4.2.0 we can probe for the default CPU model used by QEMU
for a particular machine type and store it in the domain XML. This
way the chosen CPU model is more visible to users and libvirt will
make sure the guest will see the exact same CPU after migration.
</description>
</change>
<change>
<summary>
Adaptation to qemu's blockdev
</summary>
<description>
QEMU introduced a new way of specifying disks on the command line
which enables fine-grained control over the block stack. Libvirt has
adapted to this.
</description>
</change>
</section>
<section title="Refactors">
<change>
<summary>
More GLib integration
</summary>
<description>
More patches were merged that replace our internal functions with
GLib ones. Also some effort was invested in replacing gnulib modules
with GLib functions.
</description>
</change>
<change>
<summary>
Rewrite of Perl scripts into Python
</summary>
<description>
Libvirt used Perl scripts to check for coding style, generate some
code and things like that. To bring the number of languages used
down, these scripts were rewritten into Python.
</description>
</change>
<change>
<summary>
Provide init scripts for sub-deaemons
</summary>
<description>
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 <code>--with-init-script</code>
configure option.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
Warn verbosely if using old loader:nvram pairs
</summary>
<description>
Some distributions still use <code>--with-loader-nvram</code> or
<code>nvram</code> variable in qemu.conf. This is now discouraged in
favour of FW descriptors. However, instead of silently ignoring user's
config, libvirt warns if outdated config is detected.
</description>
</change>
<change>
<summary>
Drop pconfig from Icelake-Server CPU model
</summary>
<description>
The pconfig feature was enabled in QEMU by accident in 3.1.0. All
other newer versions do not support it and it was removed from the
Icelake-Server CPU model in QEMU.
</description>
</change>
<change>
<summary>
Wait longer for device removal confirmation on PPC64
</summary>
<description>
After sending device hot unplug request to QEMU, libvirt waits up to
5 seconds for qemu to confirm the device removal. On some
architectures (like PPC64) this can take longer time and libvirt now
reflects that.
</description>
</change>
<change>
<summary>
Forcibly create nodes in domain's namespace
</summary>
<description>
The QEMU driver starts a domain in a namepsace with private
<code>/dev</code> and creates only those nodes there which the domain
is configured to have. However, it may have happened that if a node
changed its minor number this change wasn't propagated to the
namespace.
</description>
</change>
<change>
<summary>
Various AppArmor bugfixes
</summary>
<description>
The AppArmor driver now knows how to handle
<code>&lt;shmem/&gt;</code> devices and also snapshotting more disks
at once.
</description>
</change>
<change>
<summary>
Improved video model autoselection
</summary>
<description>
If a graphics device was added to XML that had no video device,
libvirt automatically added a video device which was always of type
'cirrus' on x86_64, even if the underlying qemu didn't support
cirrus. Libvirt now bases the decision on qemu's capabilities.
</description>
</change>
</section>
</release>
<release version="v5.9.0" date="2019-11-05">
<section title="Packaging changes">
<change>
<summary>
Start linking against GLib and using its features
</summary>
<description>
Up until now, libvirt has been dealing with platform portability and
the lack of certain features in libc by using gnulib and implementing
its own functions and data structures respectively; going forward, it
will prefer the facilities offered by GLib instead.
</description>
</change>
<change>
<summary>
Stop distributing generated documentation
</summary>
<description>
Most downstreams already patch the libvirt source to some extent, so
this change will probably not affect them.
</description>
</change>
<change>
<summary>
Rewrite several Perl scripts in Python
</summary>
<description>
Phasing out Perl usage is part of the project strategy.
</description>
</change>
</section>
<section title="New features">
<change>
<summary>
qemu: Introduce a new video model of type 'ramfb'
</summary>
<description>
Introduce a new video model type to the domain XML that supports the
<code>ramfb</code> standalone device in qemu.
</description>
</change>
<change>
<summary>
qemu: Implement the ccf-assist pSeries feature
</summary>
<description>
Users can now decide whether ccf-assist (Count Cache Flush Assist)
support should be available to pSeries guests.
</description>
</change>
<change>
<summary>
Xen: Support specifying ACPI firmware path
</summary>
<description>
The libxl driver now supports specifying an ACPI firmware path
using the <code>acpi</code> element.
</description>
</change>
<change>
<summary>
qemu: Support specifying resolution for video devices
</summary>
</change>
</section>
<section title="Removed features">
<change>
<summary>
logging: Drop support for including stack traces
</summary>
<description>
This feature was intended to aid debugging, but in practice it
resulted in logs that were too verbose to be useful and also resulted
in a significant performance penalty.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
qemu: Implement CPU comparison/baseline on s390x
</summary>
<description>
This functionality has been historically limited to x86_64, but it's
now available on s390x too.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
lib: autostart objects exactly once
</summary>
<description>
If libvirtd or any of the sub-daemons is started with socket
activation then objects might be autostarted more than once.
For instance, if a domain under <code> qemu:///session </code>
URI is mark as autostarted and the session daemon is started then the
domain is started with it. If user shuts the domain down and the
session daemon is started again, the user's wish to keep the
domain shut off is ignored and the domain is autostarted again.
This is now fixed.
</description>
</change>
<change>
<summary>
qemu: Properly advertise bochs-display availability
</summary>
<description>
Support for <code>bochs-display</code> was introduced in libvirt
5.6.0, but until now the model was not listed in the domain
capabilities.
</description>
</change>
<change>
<summary>
security: Don't remember labels for TPM devices
</summary>
<description>
Due to the way they're implemented in the kernel, trying to remember
labels for TPM devices makes it impossible to use them.
</description>
</change>
<change>
<summary>
security: Properly rollback after failure in a stacked driver
</summary>
<description>
When multiple security drivers are involved, failure in one of them
would result in only the corresponding changes being rolled back,
leaving the ones performed by drivers that had been activated earlier
in place. All changes are rolled back now.
</description>
</change>
<change>
<summary>
Fix build with musl libc
</summary>
</change>
<change>
<summary>
Improve compatibility with non-bash shells
</summary>
</change>
</section>
</release>
<release version="v5.8.0" date="2019-10-05">
<section title="New features">
<change>
<summary>
qemu: Support use of precreated tap/macvtap devices by unprivileged libvirtd
</summary>
<description>
It is now possible for an unprivileged libvirtd to make use
of tap and macvtap devices that were previously created by
some other entity. This is done by setting
<code>managed='no'</code> along with the device name in the
<code>target</code> subelement of <code>&lt;interface
type='ethernet'&gt;</code>.
</description>
</change>
<change>
<summary>
qemu: Support vhost-user-gpu
</summary>
<description>
Support for running virtio GPUs in separate processes with vhost-user
backend. It requires QEMU newer than 4.1.
</description>
</change>
<change>
<summary>
Introduce virConnectSetIdentity API
</summary>
<description>
When split daemons are in use, this API is used to forward uid,
gid and SELinux info from <code>virproxyd</code> to other driver
daemons such as <code>virtqemud</code>.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
qemu: Support running SLIRP networking in a separate process
</summary>
<description>
User can configure the slirp-helper path in <code>qemu.conf</code>.
It will start a slirp-helper process to provide SLIRP networking
when the VM is started with network interface "user". That will allow
stricter security policies for QEMU SLIRP network.
</description>
</change>
</section>
<section title="Removed features">
<change>
<summary>
Remove xenapi driver
</summary>
<description>
The xenapi driver is removed since it has not received any significant
development since its initial contribution nine years ago and has no
known user base.
</description>
</change>
</section>
</release>
<release version="v5.7.0" date="2019-09-03">
<section title="New features">
<change>
<summary>
qemu: Support Direct Mode for Hyper-V Synthetic timers
</summary>
<description>
The QEMU driver now supports Direct Mode for Hyper-V Synthetic timers
for Hyper-V guests.
</description>
</change>
<change>
<summary>
lib: Add virDomainGetGuestInfo()
</summary>
<description>
This API is intended to aggregate several guest agent information
queries and is inspired by stats API
<code>virDomainListGetStats()</code>. It is anticipated that this
information will be provided by a guest agent
running within the domain. It's exposed as <code>virsh
guestinfo</code>.
</description>
</change>
<change>
<summary>
Experimental split of libvirtd into separate daemons
</summary>
<description>
The big monolithic libvirtd daemon can now be replaced by smaller
per-driver daemons. The new split daemons are considered experimental
at this time and distributions are encouraged to continue using the
traditional libvirtd by default.
</description>
</change>
<change>
<summary>
qemu: Support kvm-hint-dedicated performance hint
</summary>
<description>
With <code>&lt;hint-dedicated state='on'/&gt;</code> and
<code>&lt;cpu mode='host-passthrough'/&gt;</code>, it
allows a guest to enable optimizations when running on dedicated
vCPUs. QEMU newer than 2.12.0 and kernel newer than 4.17
are required.
</description>
</change>
</section>
<section title="Removed features">
<change>
<summary>
Remove KVM assignment support
</summary>
<description>
The KVM style of PCI device assignment was removed from
the kernel in version 4.12.0 after being deprecated since 4.2.0.
Libvirt defaults to VFIO for a long time. Remove support for
KVM device assignment from libvirt too.
</description>
</change>
<change>
<summary>
libxml: min required libxml is now 2.9.1
</summary>
<description>
Support for building with libxml versions older than 2.9.1
has been dropped.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
virsh: Support setting bandwidth in migrate subcommand
</summary>
<description>
In addition to postcopy bandwidth, the <code>virsh migrate</code>
subcommand now supports specifying precopy bandwidth with the
<code>--bandwidth</code> parameter.
</description>
</change>
<change>
<summary>
libxl: Implement domain metadata getter/setter
</summary>
<description>
The libxl driver now supports <code>virDomainGetMetadata()</code> and
<code>virDomainSetMetadata()</code> APIs.
</description>
</change>
<change>
<summary>
test driver: Expand API coverage
</summary>
<description>
Additional APIs have been implemented in the test driver.
</description>
</change>
<change>
<summary>
Report RNG device in domain capabilities XML
</summary>
<description>
Libvirt now reports if RNG devices are supported by the underlying
hypervisor in the domain capabilities XML.
</description>
</change>
<change>
<summary>
Stop linking NSS plugins with libvirt.so
</summary>
<description>
This reduces the amount of code and 3rd party libraries are that
loaded into all processes.
</description>
</change>
<change>
<summary>
Split the setuid virt-login-shell binary into two pieces
</summary>
<description>
The setuid virt-login-shell binary is now a tiny shim that
sanitizes the process execution environment variables and
arguments, before launching the trusted virt-login-shell-helper
binary.
</description>
</change>
<change>
<summary>
qemu: Allow migration with disk cache on
</summary>
<description>
When QEMU supports flushing caches at the end of migration, we can
safely allow migration even if <code>disk/driver/@cache</code> is
neither <code>none</code> nor <code>directsync</code>.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
Various security label remembering fixes
</summary>
<description>
In the previous release libvirt introduced remembering of original
owners and SELinux labels on files. However, the feature did not work
properly with snapshots, on migrations or on network filesystems.
This is now fixed.
</description>
</change>
<change>
<summary>
Allow greater PCI domain numbers
</summary>
<description>
Libvirt used to require PCI domain number to be not greater than
0xFFFF. The code was changed to allow 32 bits long numbers.
</description>
</change>
<change>
<summary>
Various D-Bus fixes
</summary>
<description>
When D-Bus is not available, libvirt was reporting random errors.
These are now gone.
</description>
</change>
<change>
<summary>
Prefer read-only opening of PCI config files
</summary>
<description>
When enumerating PCI bus, libvirt opens config files under
<code>sysfs</code> mount and parses them to learn various aspects of
the device (e.g. its capabilities). Only in a very limited number of
cases it is actually writing into the file. However, it used to open
the file also for writing even if it was only reading from it.
</description>
</change>
<change>
<summary>
Fix AppArmor profile
</summary>
<description>
Since the <code>5.6.0</code> release, libvirt uses
<code>procfs</code> to learn the list of opened file descriptors when
spawning a command. However, our AppArmor profile was not allowing
such access.
</description>
</change>
<change>
<summary>
Don't block storage driver when starting or building a pool
</summary>
<description>
Starting or building a storage pool can take a long time to finish.
During this time the storage driver was blocked and thus no other API
involving the storage driver could run. This is now fixed.
</description>
</change>
</section>
</release>
<release version="v5.6.0" date="2019-08-05">
<section title="New features">
<change>
<summary>
qemu: Introduce a new video model of type 'bochs'
</summary>
<description>
Introduce a new video model type that supports the
<code>bochs-display</code> device that was added in qemu version 3.0.
</description>
</change>
<change>
<summary>
api: new virDomainCheckpoint APIs
</summary>
<description>
Introduce several new APIs for creating and managing
checkpoints in the test and qemu drivers (the latter
requires qcow2 images). Checkpoints serve as a way to tell
which portions of a disk have changed since a point in time.
</description>
</change>
<change>
<summary>
qemu: Add support for overriding max threads per process limit
</summary>
<description>
systemd-based systems impose a limit on the number of threads a
process can spawn, which in some cases can be exceeded by QEMU
processes running VMs. Add a <code>max_threads_per_process</code>
option to qemu.conf to override the system default.
</description>
</change>
<change>
<summary>
Remember original owners and SELinux labels of files
</summary>
<description>
When a domain is starting up libvirt changes DAC and
SELinux labels so that domain can access it. However,
it never remembered the original labels and therefore
the file was returned back to <code>root:root</code>.
With this release, the original labels are remembered
and restored properly.
</description>
</change>
<change>
<summary>
network: Allow passing arbitrary options to dnsmasq
</summary>
<description>
This works similarly to the existing support for passing arbitary
options to QEMU, and just like that feature it comes with no
support guarantees.
</description>
</change>
</section>
<section title="Removed features">
<change>
<summary>
xen: Remove sxpr config support
</summary>
<description>
Remove the sxpr style config parser and formatter a year after the
xend driver was removed.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
qemu: Allow XML validation for snapshot creation
</summary>
<description>
Add flag <code>VIR_DOMAIN_SNAPSHOT_CREATE_VALIDATE</code> to validate
snapshot input XML. For virsh, users can use it as <code>virsh
snapshot-create --validate</code>.
</description>
</change>
<change>
<summary>
Support encrypted soft TPM
</summary>
<description>
A soft TPM backend could be encrypted with passphrase. Now libvirt
supports using a <code>secret</code> object to hold the passphrase,
and referring to it via the <code>encryption</code> element of the
TPM device.
</description>
</change>
<change>
<summary>
test driver: Expand API coverage
</summary>
<description>
Additional APIs have been implemented in the test driver.
</description>
</change>
<change>
<summary>
Implement per-driver locking
</summary>
<description>
Drivers now acquire a lock when they're loaded, ensuring that there
can never be two instances of the same driver active at a time.
</description>
</change>
<change>
<summary>
nss: Report newer addresses first
</summary>
<description>
In some cases, a guest might be assigned a new IP address by DHCP
before the previous lease has expired, in which case the NSS plugin
will correctly report both addresses; many applications, however,
ignore all addresses but the first, and may thus end up trying to
connect using a stale address. To prevent that from happening, the
NSS plugin will now always report the newest address first.
</description>
</change>
<change>
<summary>
util: Optimize mass closing of FDs when spawning child processes
</summary>
<description>
When the limit on the number of FDs is very high, closing all
unwanted FDs after calling <code>fork()</code> can take a lot of
time and delay the start of the child process. libvirt will now
use an optimized algorithm that minimizes such delays.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
logging: Ensure virtlogd rollover takes priority over logrotate
</summary>
<description>
virtlogd implements its own rollover mechanism, but until now
logrotate could end up acting on the logs before virtlogd had a
chance to do so itself.
</description>
</change>
</section>
</release>
<release version="v5.5.0" date="2019-07-02">
<section title="Security">
<change>
<summary>
api: Prevent access to several APIs over read-only connections
</summary>
<description>
Certain APIs give root-equivalent access to the host, and as such
should be limited to privileged users. CVE-2019-10161,
CVE-2019-10166, CVE-2019-10167, CVE-2019-10168.
</description>
</change>
</section>
<section title="New features">
<change>
<summary>
qemu: Support SMMUv3 IOMMU
</summary>
<description>
SMMUv3 is an IOMMU implementation for ARM virt guests.
</description>
</change>
<change>
<summary>
network: Introduce the network port API
</summary>
<description>
This new public API can be used by virtualization drivers to
manage network resources associated with guests, and is a further
step towards splitting libvirtd into multiple daemons.
</description>
</change>
</section>
<section title="Removed features">
<change>
<summary>
qemu: Remove support for virDomainQemuAttach and virConnectDomainXMLFromNative APIs
</summary>
<description>
The qemu implementations for the APIs mentioned above were removed
and the APIs now return an error. The implementation was stale for a
long time and did not work with modern QEMU command lines, generated
from libvirt or otherwise.
</description>
</change>
<change>
<summary>
Stop supporting migration of config files from pre-XDG layout
</summary>
<description>
The new layout was introduced with libvirt 0.9.13 (Jul 2012).
</description>
</change>
<change>
<summary>
Remove Avahi mDNS support
</summary>
<description>
This feature was never used outside of virt-manager, which has
itself stopped using it a while ago.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
sysinfo: Report SMBIOS information on aarch64
</summary>
<description>
While SMBIOS support has historically been limited to x86_64, modern
aarch64 machines often offer access to the same information as well,
and libvirt now exposes it to the user when that's the case.
</description>
</change>
<change>
<summary>
test driver: Expand API coverage
</summary>
<description>
Even more APIs that were missing from the test driver have now been
implemented.
</description>
</change>
<change>
<summary>
virt-xml-validate: Allow input to be read from stdin
</summary>
</change>
<change>
<summary>
qemu: Validate spapr-vio addresses as 32-bit
</summary>
<description>
libvirt has always considered these addresses (used for pSeries
guests) as 64-bit, but the sPAPR specification says that they're
32-bit instead.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
qemu: Set process affinity correctly when using &lt;numatune&gt;
</summary>
<description>
libvirt would mistakenly interpret the <code>nodeset</code>
attribute as a list of CPUs instead of as a list of NUMA node, and
the process affinity would be set incorrectly as a result; this has
now been fixed.
</description>
</change>
</section>
</release>
<release version="v5.4.0" date="2019-06-03">
<section title="Security">
<change>
<summary>
cpu: Introduce support for the md-clear CPUID bit
</summary>
<description>
This bit is set when microcode provides the mechanism to invoke a
flush of various exploitable CPU buffers by invoking the x86
<code>VERW</code> instruction. CVE-2018-12126, CVE-2018-12127,
CVE-2018-12130, CVE-2019-11091.
</description>
</change>
<change>
<summary>
Restrict user access to virt-admin, virtlogd and virtlockd
</summary>
<description>
The intended users for these facilities are the <code>root</code>
user and the <code>libvirtd</code> service respectively, but these
restrictions were not enforced correctly. CVE-2019-10132.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
test driver: Expand API coverage
</summary>
<description>
Several APIs that were missing from the test driver have now been
implemented.
</description>
</change>
<change>
<summary>
Avoid unnecessary static linking
</summary>
<description>
Most binaries shipped as part of libvirt, for example
<code>virtlogd</code> and <code>libvirt_iohelper</code>, were
embedding parts of the library even though they also linked against
the <code>libvirt.so</code> dynamic library. This is no longer the
case, which results in both the disk and memory footprint being
reduced.
</description>
</change>
<change>
<summary>
qemu: Report stat-htlb-pgalloc and stat-htlb-pgfail balloon stats
</summary>
<description>
These stats have been introduced in QEMU 3.0.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
qemu: Fix emulator scheduler support
</summary>
<description>
Setting the scheduler for QEMU's main thread before QEMU had a chance
to start up other threads was misleading as it would affect other
threads (vCPU and I/O) as well. In some particular situations this
could also lead to an error when the thread for vCPU #0 was being
moved to its cpu,cpuacct cgroup. This was fixed so that the
scheduler for the main thread is set after QEMU starts.
</description>
</change>
<change>
<summary>
apparmor: Allow hotplug of vhost-scsi devices
</summary>
</change>
</section>
</release>
<release version="v5.3.0" date="2019-05-04">
<section title="New features">
<change>
<summary>
qemu: Add support for setting the emulator scheduler parameters
</summary>
<description>
I/O threads and vCPU threads already support setting schedulers, but
until now it was impossible to do so for the main QEMU thread
(emulator thread in the libvirt naming). This is, however, requested
for some very specific scenarios, for example when vCPU threads are
running at such priority that could starve the main thread.
</description>
</change>
</section>
<section title="Removed features">
<change>
<summary>
vbox: Drop support for VirtualBox 4.x releases
</summary>
<description>
Support for all the 4.x releases was ended by
VirtualBox maintainers in December 2015. Therefore,
libvirt support for these releases is dropped.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
qemu: Use PCI by default for RISC-V guests
</summary>
<description>
PCI support for RISC-V guests was already available in libvirt
5.1.0, but it required the user to opt-in by manually assigning
PCI addresses: with this release, RISC-V guests will use PCI
automatically when running against a recent enough (4.0.0+) QEMU
release.
</description>
</change>
<change>
<summary>
qemu: Advertise firmware autoselection in domain capabilities
</summary>
<description>
The firmware autoselection feature is now exposed in
domain capabilities and management applications can
query for accepted values, i.e. values that are accepted
and for which libvirt found firmware descriptor files.
Firmware Secure Boot support is also advertised.
</description>
</change>
<change>
<summary>
Drop YAJL 1 support
</summary>
<description>
YAJL 2 is widely adopted and maintaining side by side
support for two versions is unnecessary.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
rpc: cleanup in virNetTLSContextNew
</summary>
<description>
Failed new gnutls context allocations in virNetTLSContextNew
function results in double free and segfault. Occasional memory
leaks may also occur.
</description>
</change>
<change>
<summary>
virsh: various completers fixes
</summary>
<description>
There were some possible crashers, memory leaks, etc.
which are now fixed.
</description>
</change>
<change>
<summary>
qemu: Make hugepages work with memfd backend
</summary>
<description>
Due to a bug in command line generation libvirt did not
honor hugepages setting with memfd backend.
</description>
</change>
<change>
<summary>
Enforce ACL write permission for getting guest time &amp; hostname
</summary>
<description>
Getting the guest time and hostname both require use of
guest agent commands. These must not be allowed for
read-only users, so the permissions check must validate
"write" permission not "read".
</description>
</change>
</section>
</release>
<release version="v5.2.0" date="2019-04-03">
<section title="New features">
<change>
<summary>
Add Storage Pool Capabilities output
</summary>
<description>
Add support to list an enumerated list of supported Storage
Pools via the virConnectGetCapabilities API when connected
via a Storage Driver. Add support to get a more detailed
list XML output Storage Pool Capabilities vis the
virConnectGetStoragePoolCapabilites API.
</description>
</change>
<change>
<summary>
qemu: Support virtio-{non-}transitional device models
</summary>
<description>
<code>virtio-transitional</code> and
<code>virtio-non-transitional</code> <code>model</code> values
were added to the QEMU driver for the following devices:
<code>disk</code>, <code>interface</code>, <code>filesystem</code>,
<code>rng</code>, <code>vsock</code>, <code>memballoon</code>,
<code>controller</code> type <code>scsi</code>,
<code>controller</code> type <code>virtio-serial</code>,
<code>input</code> bus <code>virtio</code>
type <code>passthrough</code>,
<code>hostdev</code> type <code>scsi_host</code>. These new
models can be used to give fine grained control over what
virtio device version is presented to the guest.
</description>
</change>
<change>
<summary>
qemu: Enable firmware autoselection
</summary>
<description>
Libvirt allows users to provide loader path for some time now.
However, this puts some burden on users because they need to
know what firmware meets their requirements. Now that QEMU
ships firmware description files this burden can be moved onto
libvirt. It is as easy as setting the <code>firmware</code>
attribute in the <code>os</code> element (accepted values are
<code>bios</code> and <code>efi</code>). Moreover, libvirt
automatically enables domain features needed for firmware it
chooses.
</description>
</change>
<change>
<summary>
snapshots: Add support for topological listings
</summary>
<description>
A new flag VIR_DOMAIN_SNAPSHOT_LIST_TOPOLOGICAL is available
for the various snapshot listing APIs such as
virDomainListAllSnapshots(). For drivers that support the
flag, the listed snapshots are guaranteed to be sorted such
that parents occur before children.
</description>
</change>
<change>
<summary>
Xen: Add support for max grant frames setting
</summary>
<description>
Add support for Xen's max_grant_frames setting by adding a
new xenbus controller type with a maxGrantFrames attribute.
E.g. <code>&lt;controller type='xenbus' maxGrantFrames='64'/&gt;</code>
</description>
</change>
<change>
<summary>
qemu: Add support for parallel migration
</summary>
<description>
With QEMU 4.0.0 libvirt can enable parallel migration which causes
the memory pages to be processed in parallel by several threads and
sent to the destination host using several connections at the same
time. This may increase migration speed in case a single thread is
unable to saturate the network link.
</description>
</change>
</section>
<section title="Removed features">
<change>
<summary>
Drop support for Upstart and "Red Hat" init scripts
</summary>
<description>
Not a single one of the platforms we target still uses Upstart,
and the Upstart project itself has been abandoned for several years
now; the same is true for the "Red Hat" (really System V) init
scripts, since RHEL 7 and later releases use systemd.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
Report class information for PCI node device capability.
</summary>
</change>
<change>
<summary>
Split setup of IPv4 and IPv6 top level chain
</summary>
<description>
The requirement resulting from private chains improvement done
in <code>v5.1.0</code> was refined so that only tables from
corresponding IP version are required. This means that if a
network doesn't have <code>IPv6</code> enabled then those
tables are not required.
</description>
</change>
<change>
<summary>
Don't default to building the QEMU driver
</summary>
<description>
Historically, the QEMU driver has been special in that it was
enabled by default, with the option to explicitly opt-out of it;
starting now, we're enabling it opportunistically if we detect that
all requirements are available, just like we do with other drivers.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
virt-host-validate: Fix IOMMU check on s390x
</summary>
</change>
<change>
<summary>
qemu: Allow creating pSeries guests with graphics and no USB mouse
</summary>
<description>
It's now possible to prevent libvirt from automatically adding a
USB mouse to pSeries guests by including a USB tablet in the input
XML: doing so is desiderable as using a tablet results in a much
better user experience when working with GUIs.
</description>
</change>
<change>
<summary>
qemu: Set $HOME and XGD variables for qemu:///system guests
</summary>
<description>
This avoids files being accidentally created under <code>/</code> or
the guests not being able to start because they lack the necessary
permissions to write to that location.
</description>
</change>
</section>
</release>
<release version="v5.1.0" date="2019-03-04">
<section title="New features">
<change>
<summary>
bhyve: Add support for additional command-line arguments
</summary>
<description>
The bhyve driver now supports passing additional command-line
arguments to the bhyve process using the new
<code>&lt;bhyve:commandline&gt;</code> element in domain
configuration.
</description>
</change>
<change>
<summary>
network: Support setting a firewalld "zone" for virtual network bridges
</summary>
<description>
All libvirt virtual networks with bridges managed by libvirt
(i.e. those with forward mode of "nat", "route", "open", or
no forward mode) will now be placed in a special firewalld
zone called "libvirt" by default. The zone of any network
bridge can be changed using the <code>zone</code> attribute
of the network's <code>bridge</code> element.
</description>
</change>
<change>
<summary>
bhyve: Support for ignoring unknown MSRs reads and writes
</summary>
<description>
A new &lt;features&gt; element &lt;msrs unknown='ignore'/&gt; was
introduced and the bhyve driver supports it to control unknown
Model Specific Registers (MSRs) reads and writes.
</description>
</change>
<change>
<summary>
qemu: Add support for encrypted VNC TLS keys
</summary>
<description>
Use the password stored in the secret driver under the uuid
specified by the <code>vnc_tls_x509_secret_uuid</code> option
in qemu.conf.
</description>
</change>
<change>
<summary>
Add storage pool namespace options
</summary>
<description>
Allow for adjustment of RBD configuration options via Storage
Pool XML Namespace adjustments.
</description>
</change>
<change>
<summary>
qemu: Add support for setting post-copy migration bandwidth
</summary>
<description>
Users can now limit the bandwidth of post-copy migration, e.g.
via <code>virsh migrate --postcopy-bandwidth</code>.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
Create private chains for virtual network firewall rules
</summary>
<description>
Historically firewall rules for virtual networks were added
straight into the base chains. This works but has a number of
bugs and design limitations. To address them, libvirt now puts
firewall rules into its own chains. Note that with this change the
<code>filter</code>, <code>nat</code> and <code>mangle</code> tables
are required for both <code>IPv4</code> and <code>IPv6</code>.
</description>
</change>
<change>
<summary>
Detect CEPH and GPFS as shared FS
</summary>
<description>
When starting a migration libvirt performs some sanity checks
to make sure domain will be able to run on the destination.
One of the requirements is that the disk has to either be
migrated too or be accessible from a network filesystem. CEPH
and GPFS weren't detected as a network filesystem.
</description>
</change>
<change>
<summary>
Advertise network MTU via DHCP when specified
</summary>
<description>
If network MTU is set and the network has DHCP enabled,
advertise the MTU in DHCP transaction too so that clients can
adjust their link accordingly.
</description>
</change>
<change>
<summary>
qemu: Allocate memory at the configured NUMA nodes from start
</summary>
<description>
Libvirt used to just start QEMU, let it allocate memory for
the guest, and then use CGroups to move the memory to
configured NUMA nodes. This is suboptimal as huge chunks of
memory have to be moved. Moreover, this relies on ability to
move memory later which is not always true. A change was made
to set process affinity correctly from the start so that memory
is allocated on the configured nodes from the beginning.
</description>
</change>
<change>
<summary>
Support for newer Wireshark
</summary>
<description>
Adapt libvirt to use the more recent release requiring a
source build configuration of libvirt
<code>--with-wireshark</code> to upgrade to the more recent
version.
</description>
</change>
<change>
<summary>
Batch mode virsh and virt-admin parsing improvements
</summary>
<description>
When parsing a single-argument command_string in batch mode,
virsh and virt-admin now permit newlines in addition to
semicolons for splitting commands, and backslash-newline for
splitting long lines, to be more like shell parsing.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
qemu: Use CAP_DAC_OVERRIDE during QEMU capabilities probing
</summary>
<description>
By default, libvirt runs the QEMU process as <code>qemu:qemu</code>
which could cause issues during probing as some features like AMD SEV
might be inaccessible to QEMU because of file system permissions.
Therefore, <code>CAP_DAC_OVERRIDE</code> is granted to overcome these
for the purposes of probing.
</description>
</change>
<change>
<summary>
storage: Add default mount options for fs/netfs storage pools
</summary>
<description>
Altered the command line generation for fs/netfs storage pools to
add some default options. For Linux based systems, the options
added are "nodev, nosuid, noexec". For FreeBSD based systems,
the options added are "nosuid, noexec".
</description>
</change>
<change>
<summary>
qemu: Allow use of PCI for RISC-V guests
</summary>
<description>
This works with QEMU 4.0.0+ only and is opt-in at the moment, since
it requires users to manually assign PCI addresses, but is otherwise
fully functional.
</description>
</change>
<change>
<summary>
network: Fix virtual networks on systems using firewalld+nftables
</summary>
<description>
Because of the transitional state of firewalld's new support
for nftables, not all iptables features required by libvirt
are yet available, so libvirt must continue to use iptables
for its own packet filtering rules even when the firewalld
backend is set to use nftables. However, due to the way
iptables support is implemented in kernels using nftables
(iptables rules are converted to nftables rules and
processed in a separate hook from the native nftables
rules), guest networking was broken on hosts with firewalld
configured to use nftables as the backend. This has been
fixed by putting libvirt-managed bridges in their own
firewalld zone, so that guest traffic can be forwarded
beyond the host and host services can be exposed to guests
on the virtual network without opening up those same
services to the rest of the physical network. This means
that host access from virtual machines is no longer
controlled by the firewalld default zone (usually "public"),
but rather by the new firewalld zone called "libvirt"
(unless configured otherwise using the new zone
attribute of the network bridge element).
</description>
</change>
<change>
<summary>
qemu: Fix i6300esb watchdog hotplug on Q35
</summary>
<description>
Ensure that libvirt allocates a PCI address for the device so
that QEMU did not default to an address that would not allow
for device hotplug.
</description>
</change>
<change>
<summary>
lxc: Don't reboot host on virDomainReboot
</summary>
<description>
If the container is really a simple one (init is just bash and
the whole root is passed through) then virDomainReboot and
virDomainShutdown would reboot or shutdown the host. The
solution is to use different method to reboot or shutdown the
container in that case (e.g. signal).
</description>
</change>
<change>
<summary>
rpc: Various stream fixes
</summary>
<description>
One particular race was fixed, one locking problem and error
reporting from streams was made better.
</description>
</change>
<change>
<summary>
qemu: Fix guestfwd hotplug/hotunplug
</summary>
<description>
Fixed the generation of the guestfwd hotplug/unplug command
sent to QEMU to match the syntax used when creating the
initial command line.
</description>
</change>
<change>
<summary>
qemu: Forbid CDROMs on virtio bus
</summary>
<description>
Attempting to create an empty virtio-blk drive or attempting
to eject it results into an error. Forbid configurations
where users would attempt to use CDROMs in virtio bus.
</description>
</change>
<change>
<summary>
qemu: Use 'raw' for 'volume' disks without format
</summary>
<description>
Storage pools might want to specify format of the image when
translating the volume thus libvirt can't add any default
format when parsing the XML. Add an explicit format when
starting the VM and format is not present neither by user
specifying it nor by the storage pool translation function.
</description>
</change>
<change>
<summary>
qemu: Assume 'raw' default storage format also for network storage
</summary>
<description>
Post parse callback adds the 'raw' type only for local files.
Remote files can also have backing store (even local) so we
should do this also for network backed storage.
</description>
</change>
<change>
<summary>
qemu: Fix block job progress reporting and advocate for READY event
</summary>
<description>
In some cases QEMU can get to 100% and still not reach the
synchronised phase. Initiating a pivot in that case will fail.
Therefore it is strongly advised to wait for
<code>VIR_DOMAIN_BLOCK_JOB_READY</code> event which does not
suffer from this problem.
</description>
</change>
<change>
<summary>
qemu: Don't format image properties for empty drive
</summary>
<description>
If a <code>-drive</code> has no image, then formatting
attributes such as cache, readonly, etc. would cause errors to
be reported from QEMU. This was fixed by not supplying the
attributes for devices without an image.
</description>
</change>
<change>
<summary>
External snapshot metadata redefinition is fixed
</summary>
<description>
Attempting to use VIR_DOMAIN_SNAPSHOT_CREATE_REDEFINE to
reinstate the metadata describing an external snapshot
created earlier for an offline domain no longer fails.
</description>
</change>
</section>
</release>
<release version="v5.0.0" date="2019-01-15">
<section title="New features">
<change>
<summary>
Xen: Add support for openvswitch
</summary>
<description>
The libxl driver now supports virtual interfaces that connect to
an openvswitch bridge, including interfaces with VLAN tagging and
trunking configuration.
</description>
</change>
<change>
<summary>
qemu: Report whether KVM nesting is available
</summary>
<description>
Running nested KVM guests requires specific configuration steps to
be performed on the host; libvirt will now report in the host
capabilities whether KVM nesting support is available.
</description>
</change>
</section>
<section title="Removed features">
<change>
<summary>
Drop UML driver
</summary>
<description>
The UML driver was unmaintained and not tested for
quite some time now. Worse, there is a bug that causes
it to deadlock on some very basic operations (e.g.
dumping domain XML). These facts make us believe no one
uses it.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
qemu: Add support for ARMv6l guests
</summary>
</change>
<change>
<summary>
Support more NVDIMM configuration options
</summary>
<description>
Introduce more configuration options. For the source element, add
the 'alignsize' and 'pmem' subelements. For the target element, add
the 'readonly' subelement.
</description>
</change>
<change>
<summary>
cpu: Add support for "stibp" x86_64 feature
</summary>
<description>
Add cpu flag stibp (Single Thread Indirect Branch Predictors) to
prevent indirect branch predictions from being controlled by the
sibling Hyperthread.
</description>
</change>
<change>
<summary>
libxl: Handle external domain destroy
</summary>
<description>
Historically, if a domain was destroyed using <code>xl</code>
rather than through libvirt APIs, libvirt would not be aware of
the fact and keep considering it as running. This is no longer the
case.
</description>
</change>
<change>
<summary>
Start selecting the first available DRI device for OpenGL operations
</summary>
<description>
If OpenGL support is needed (either with SPICE gl enabled or with
egl-headless), libvirt is now able to pick the first available DRI
device for the job. At the same time, this improvement is also a
bugfix as it prevents permission-related issues with regards to our
mount namespaces and the default DRI render node's permissions which
would normally prevent QEMU from accessing such a device.
</description>
</change>
<change>
<summary>
qemu: Add support for postcopy-requests migration statistics
</summary>
<description>
The <code>virDomainJobInfo</code> can get number page requests
received from the destination host during post-copy migration.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
lxc: Don't forbid interfaces with type=direct
</summary>
<description>
Such interfaces are supported by lxc and should be allowed.
</description>
</change>
<change>
<summary>
qemu: Fully clean up RNG devices on detach
</summary>
<description>
Some RNG device types, such as those using EGD, might need extra
clean up on the host in addition to removing the guest-side device.
</description>
</change>
</section>
</release>
<release version="v4.10.0" date="2018-12-03">
<section title="New features">
<change>
<summary>
qemu: Add Hyper-V PV IPI and Enlightened VMCS support
</summary>
<description>
The QEMU driver now has support for Hyper-V PV IPI and Enlightened VMCS
for Windows and Hyper-V guests.
</description>
</change>
<change>
<summary>
qemu: Added support for PCI devices on S390
</summary>
<description>
PCI addresses can now include the new zpci element which contains
uid (user-defined identifier) and fid (PCI function identifier)
attributes and makes the corresponding devices usable by S390
guests.
</description>
</change>
<change>
<summary>
Support changing IOThread polling parameters for a live guest
</summary>
<description>
Introduced virDomainSetIOThreadParams which allows dynamically
setting the IOThread polling parameters used by QEMU to manage
the thread polling interval and the algorithm for growth or
shrink of the polling time. The values only affect a running
guest with IOThreads. The guest's IOThread polling values can
be viewed via the domain statistics.
</description>
</change>
<change>
<summary>
Xen: Add support for PVH
</summary>
<description>
The libxl driver now supports Xen's PVH virtual machine type.
PVH machines are enabled with the new "xenpvh" OS type, e.g.
<code>&lt;os&gt;&lt;type&gt;xenpvh&lt;/type&gt;&lt;/os&gt;</code>
</description>
</change>
<change>
<summary>
qemu: Added support for CMT (Cache Monitoring Technology)
</summary>
<description>
Introduced cache monitoring using the <code>monitor</code>
element in <code>cachetune</code> for vCPU threads. Added
interfaces to get and display the cache utilization statistics
through the command 'virsh domstats' via the
virConnectGetAllDomainStats API.
</description>
</change>
<change>
<summary>
qemu: Add support for nested HV for pSeries guests
</summary>
<description>
Nested HV support makes it possible to run nested (L2) guests
with minimal performance penalty when compared to regular (L1)
guests on ppc64 hardware.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
Xen: Handle soft reset shutdown event
</summary>
<description>
The pvops Linux kernel uses soft reset to handle the crash
machine operation. The libxl driver now supports the soft
reset shutdown event, allowing proper crash handling of
pvops-based HVM domains.
</description>
</change>
</section>
</release>
<release version="v4.9.0" date="2018-11-04">
<section title="New features">
<change>
<summary>
util: Add cgroup v2 support
</summary>
<description>
cgroup v2 support has been implemented in libvirt, with both
"unified" (v2 only) and "hybrid" (v2 + v1) setups being usable;
existing "legacy" (v1 only) setups will keep working.
</description>
</change>
<change>
<summary>
qemu: Add vfio AP support
</summary>
<description>
The QEMU driver now has support to passthrough adjunct processors
into QEMU guests on S390.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
rpc: Make 'genprotocol' output reproducible
</summary>
<description>
This is another step towards making libvirt builds fully
reproducible.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
security: Fix permissions for UNIX sockets
</summary>
<description>
Since 4.5.0, libvirt is using FD passing to hand sockets over to
QEMU, which in theory removes the need for them to be accessible by
the user under which the QEMU process is running; however, other
processes such as vdsm need to access the sockets as well, which
means adjusting permissions is still necessary.
</description>
</change>
<change>
<summary>
cpu_map: Add Icelake model definitions
</summary>
<description>
These CPU models will be available in the upcoming 3.1.0 QEMU
release.
</description>
</change>
<change>
<summary>
util: Properly parse URIs with missing trailing slash
</summary>
<description>
Some storage URIs were not parsed correctly, in which case libvirt
ended up emitting XML that it would then refuse to parse back.
</description>
</change>
</section>
</release>
<release version="v4.8.0" date="2018-10-01">
<section title="New features">
<change>
<summary>
Xen: Support PM Suspend and Wakeup
</summary>
<description>
The libxl driver now supports the virDomainPMSuspendForDuration
and virDomainPMWakeup APIs.
</description>
</change>
</section>
<section title="Removed features">
<change>
<summary>
Xen: Drop support for Xen 4.4 and 4.5
</summary>
<description>
Xen 4.4 and 4.5 are no longer supported by the Xen community.
Drop support for these older versions and require Xen >= 4.6.
</description>
</change>
<change>
<summary>
nwfilter: Disallow binding creation in session mode
</summary>
<description>
Ensure that a filter binding creation is not attempted in session
mode and generates a proper error message.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
qemu: Retrieve guest hostname through QEMU Guest Agent command
</summary>
<description>
QEMU is now able to retrieve the guest hostname using a new QEMU-GA
command called 'guest-get-host-name'. Virsh users can execute
'domhostname' for QEMU driver for domains configured to use the
Guest Agent.
</description>
</change>
<change>
<summary>
virsh: Implement vsh-table in virsh and virsh-admin
</summary>
<description>
The new API fixes problems with table-alignment, making the tables
more readable and deals with unicode.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
storage: Allow inputvol to be encrypted
</summary>
<description>
When creating a storage volume based on another volume, the base
input volume is allowed to be encrypted.
</description>
</change>
<change>
<summary>
virsh: Require explicit --domain for domxml-to-native
</summary>
<description>
The --domain option for domxml-to-native virsh command has always
been documented as required, but commit v4.3.0-127-gd86531daf2
accidentally made it optional.
</description>
</change>
<change>
<summary>
lxc_monitor: Avoid AB / BA lock race
</summary>
<description>
A deadlock situation could occur when autostarting a LXC domain
'guest' due to two threads attempting to take opposing locks while
holding opposing locks (AB BA problem).
</description>
</change>
</section>
</release>
<release version="v4.7.0" date="2018-09-03">
<section title="New features">
<change>
<summary>
storage: add storage pool iscsi-direct
</summary>
<description>
Introduce a new storage pool backend that uses libiscsi instead of
iscsiadm. It support basic pool operations: checkPool and refreshPool.
</description>
</change>
<change>
<summary>
Add support for MBA (Memory Bandwidth Allocation technology)
</summary>
<description>
Domain vCPU threads can now have allocated some parts of host memory
bandwidth by using the <code>memorytune</code> element in <code>cputune</code>.
</description>
</change>
<change>
<summary>
qemu: Add support for RISC-V guests
</summary>
<description>
riscv32 and riscv64 guest architectures are now supported.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
qemu: Add ccw support for vhost-vsock
</summary>
<description>
Support the vhost-vsock-ccw device on S390.
</description>
</change>
<change>
<summary>
qemu: Make default machine type independent of QEMU
</summary>
<description>
We can't control whether or not QEMU will change its default
machine type in the future, or whether downstream distributions
will decide to compile out some machine types, so our only option
to provide a predictable behavior is taking care of the default
ourselves; management applications and users are encouraged to
explicitly pick a machine type when creating new guests.
</description>
</change>
<change>
<summary>
apparmor: Various improvements
</summary>
<description>
Rules have been added to deal with a number of scenarios that
didn't work correctly.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
esx: Truncate CPU model name
</summary>
<description>
Some CPU model names are too long to be stored into the
corresponding property, and should be explicitly truncated
to avoid unexpected behavior in users of the
<code>virNodeGetInfo()</code> API such as
<code>virsh nodeinfo</code>.
</description>
</change>
<change>
<summary>
utils: Remove arbitrary limit on socket_id/core_id
</summary>
<description>
Both values were assumed to be smaller than 4096, but in fact
they are entirely hardware-dependent and there have been reports
of machines presenting much bigger values, preventing libvirt from
working correctly; all such limits have now been removed.
</description>
</change>
</section>
</release>
<release version="v4.6.0" date="2018-08-06">
<section title="New features">
<change>
<summary>
qemu: Implement the HTM pSeries feature
</summary>
<description>
Users can now decide whether HTM (Hardware Transactional Memory)
support should be available to the guest.
</description>
</change>
<change>
<summary>
qemu: Enable VNC console for mediated devices
</summary>
<description>
Host devices now support a new atribute 'display' which can be used
to turn on frame buffer rendering on a vgpu mediated device instead of
on an emulated GPU, like QXL.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
qemu: Introduce a new video model of type 'none'
</summary>
<description>
Introduce a new video model type that disables the automatic addition
of a video device to domains with 'graphics' specified in their XML.
This can be useful with GPU mediated devices which can serve as the
only rendering devices within the guest.
</description>
</change>
<change>
<summary>
virsh: Add --alias to attach-disk and attach-interface commands
</summary>
<description>
Add option --alias to set customized device alias name when
using attach-disk or attach-interface commands.
</description>
</change>
<change>
<summary>
virsh: Support usb and sata address to attach-disk
</summary>
<description>
Usb or sata address could be used when attach-disk with --address.
For example, use usb address as usb:&lt;bus&gt;.&lt;port&gt;, use
sata address as &lt;controller&gt;.&lt;bus&gt;.&lt;unit&gt;.
</description>
</change>
</section>
</release>
<release version="v4.5.0" date="2018-07-02">
<section title="New features">
<change>
<summary>
qemu: Provide TPM emulator support
</summary>
<description>
Support QEMU's TPM emulator based on swtpm. Each QEMU guest gets
its own virtual TPM.
</description>
</change>
<change>
<summary>
bhyve: Support specifying guest CPU topology
</summary>
<description>
Bhyve's guest CPU topology could be specified using the
<code>&lt;cpu&gt;&lt;topology ../&gt;&lt;/cpu&gt;</code> element.
</description>
</change>
<change>
<summary>
qemu: Add support for extended TSEG size
</summary>
<description>
Support specifying extended TSEG size for SMM in QEMU.
</description>
</change>
<change>
<summary>
qemu: Add support for SEV guests
</summary>
<description>
SEV (Secure Encrypted Virtualization) is a feature available on AMD
CPUs that encrypts the guest memory and makes it inaccessible even
to the host OS.
</description>
</change>
</section>
<section title="Removed features">
<change>
<summary>
Remove support for qcow/default encrypted volumes
</summary>
<description>
Disallow using a qcow encrypted volume for the guest and
disallow creation of the qcow or default encrypted volume
from the storage driver. Support for qcow encrypted volumes
has been phasing out since QEMU 2.3 and by QEMU 2.9 creation
of a qcow encrypted volume via qemu-img required usage of
secret objects, but that support was never added to libvirt.
</description>
</change>
<change>
<summary>
Make GnuTLS mandatory
</summary>
<description>
Building without GnuTLS is no longer possible.
</description>
</change>
<change>
<summary>
qemu: Remove allow_disk_format_probing configuration option
</summary>
<description>
The option represented a security risk when used with malicious
disk images, so users were recommended against enabling it; with
this release, it's been removed altogether.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
capabilities: Provide info about host IOMMU support
</summary>
<description>
Capabilities XML now provide information about host IOMMU support.
</description>
</change>
<change>
<summary>
virsh: Add --all to domblkinfo command
</summary>
<description>
Alter the <code>domblkinfo</code> command to add the option
--all in order to display the size details of each domain
block device from one command in a output table.
</description>
</change>
<change>
<summary>
qemu: Allow concurrent access to monitor and guest agent
</summary>
<description>
Historically libvirt prevented concurrent accesses to
the qemu monitor and the guest agent. Therefore two
independent calls (one querying the monitor and the
other querying guest agent) would serialize which hurts
performance. The code was reworked to allow two
independent calls run at the same time.
</description>
</change>
<change>
<summary>
qemu: Allow configuring the page size for HPT pSeries guests
</summary>
<description>
For HPT pSeries guests, the size of the host pages used to back guest
memory and the usable guest page sizes are connected; the new setting
can be used to request that a certain page size is available in the
guest.
</description>
</change>
<change>
<summary>
Add support to use an raw input volume for encryption
</summary>
<description>
It is now possible to provide a raw input volume as input for
to generate a luks encrypted volume via either virsh vol-create-from
or virStorageVolCreateXMLFrom.
</description>
</change>
<change>
<summary>
qemu: Add support for vsock hot (un)plug and cold (un)plug
</summary>
</change>
<change>
<summary>
qemu: Add support for NBD over TLS
</summary>
<description>
NBD volumes can now be accessed securely.
</description>
</change>
<change>
<summary>
qemu: Implement FD passing for Unix sockets
</summary>
<description>
Instead of having QEMU open the socket and then connecting to it,
which is inherently racy, starting with QEMU 2.12 we can open the
socket ourselves and pass it to QEMU, avoiding race conditions.
</description>
</change>
<change>
<summary>
virsh: Introduce --nowait option for domstat command
</summary>
<description>
When this option is specified, virsh will try to fetch the guest
stats but abort instead of stalling if they can't be retrieved right
away.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
qemu: Fix a potential libvirtd crash on VM reconnect
</summary>
<description>
Initialization of the driver worker pool needs to come before libvirtd
trying to reconnect to all machines, since one of the QEMU processes
migh have already emitted events which need to be handled prior to
us getting to the worker pool initialization.
</description>
</change>
<change>
<summary>
qemu: Fix domain resume after failed migration
</summary>
<description>
Recent versions of QEMU activate block devices before the guest CPU
has been started, which makes it impossible to roll back a failed
migration. Use the <code>late-block-activate</code> migration
capability if supported to avoid the issue.
</description>
</change>
<change>
<summary>
vmx: Permit guests to have an odd number of vCPUs
</summary>
<description>
An odd number of vCPUs greater than 1 was forbidden in the past,
but current versions of ESXi have lifted that restriction.
</description>
</change>
</section>
</release>
<release version="v4.4.0" date="2018-06-04">
<section title="New features">
<change>
<summary>
bhyve: Support locking guest memory
</summary>
<description>
Bhyve's guest memory may be wired using the
<code>&lt;memoryBacking&gt;&lt;locked/&gt;&lt;/memoryBacking&gt;</code>
element.
</description>
</change>
<change>
<summary>
qemu: Provide VFIO channel I/O passthrough support
</summary>
<description>
Support passthrough devices that use channel I/O based mechanism in
a QEMU virtual machine.
</description>
</change>
<change>
<summary>
qemu: Add support for migration of VMs with non-shared storage over TLS
</summary>
<description>
It's now possible to use the VIR_MIGRATE_TLS flag together with
VIR_MIGRATE_NON_SHARED_DISK. The connection is then secured using the
TLS environment which is setup for the migration connection.
</description>
</change>
<change>
<summary>
Add support for VM Generation ID
</summary>
<description>
The VM Generatation ID exposes a 128-bit, cryptographically
random, integer value identifier, referred to as a Globally
Unique Identifier (GUID) to the guest in order to notify the
guest operating system when the virtual machine is executed
with a different configuration. Add a new domain XML processing
and a domain capabilities feature.
</description>
</change>
<change>
<summary>
Introduce virDomainDetachDeviceAlias
</summary>
<description>
This new API enables users to detach device using only its alias.
</description>
</change>
<change>
<summary>
Introduce new virConnectCompareHypervisorCPU and virConnectBaselineHypervisorCPU APIs
</summary>
<description>
Unlike the old virConnectCompareCPU and virConnectBaselineCPU APIs,
both new APIs consider capabilities of a specific hypervisor.
</description>
</change>
<change>
<summary>
Introduce SCSI persistent reservations support
</summary>
<description>
The QEMU driver gained support for qemu-pr-helper which enables
guests to issue SCSI commands for persistent reservation.
</description>
</change>
<change>
<summary>
qemu: Implement multiple screen support for virDomainScreenshot
</summary>
<description>
While the virDomainScreenshot API supported multihead video cards,
the implementation was missing. But now that QEMU implemented it
libvirt has done as well.
</description>
</change>
<change>
<summary>
qemu: add support for vhost-vsock-device
</summary>
<description>
A new vsock device was introduced, allowing communication between
the guest and the host via the AF_VSOCK family.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
qemu: Add suport for OpenGL rendering with SDL
</summary>
<description>
Domains using SDL as a graphics backend will now be able to use
OpenGL accelerated rendering.
</description>
</change>
<change>
<summary>
qemu: Add support for 'output' audio codec
</summary>
<description>
Support QEMU's 'hda-output' codec advertising only a line-out for ich6
and ich9 sound devices.
</description>
</change>
<change>
<summary>
virsh: Enhance event name completion
</summary>
<description>
Implement event name completion for some commands (e.g. event,
secret-event, pool-event and nodedev-event)
</description>
</change>
</section>
</release>
<release version="v4.3.0" date="2018-05-02">
<section title="New features">
<change>
<summary>
qemu: Add support for the pcie-to-pci-bridge controller
</summary>
<description>
Pure PCIe guests such as x86_64/q35 and aarch64/virt will now
add this controller when traditional PCI devices are in use.
</description>
</change>
<change>
<summary>
Xen: Support setting CPU features for host-passthrough model
</summary>
<description>
The CPU model presented to Xen HVM domains is equivalent to libvirt's
host-passthrough model, although individual features can be enabled
and disabled via the cpuid setting. The libvirt libxl driver now
supports enabling and disabling individual features of the
host-passthrough CPU model.
</description>
</change>
</section>
<section title="Removed features">
<change>
<summary>
Xen: Drop the legacy xend-based driver
</summary>
<description>
The xm/xend toolstack was deprecated in Xen 4.2 and removed
from the Xen sources in the 4.5 development cycle. The libvirt
driver based on xend is now removed from the libvirt sources.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
qemu: Support hot plug and hot unplug of mediated devices
</summary>
<description>
Libvirt now allows mediated devices to be hot plugged and hot
unplugged from a guest rather than reporting an error that this isn't
supported. In fact, kernel has been supporting this since 4.10.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
Improve handling of device mapper targets
</summary>
<description>
When starting a domain with a disk backed by a device
mapper volume libvirt also needs to allow the storage
backing the device mapper in CGroups. In the past
kernel did not care, but starting from 4.16 CGroups are
consulted on each access to the device mapper target.
</description>
</change>
</section>
</release>
<release version="v4.2.0" date="2018-04-01">
<section title="New features">
<change>
<summary>
Support building with Python 3
</summary>
<description>
Python is required to build libvirt, and up until now only Python 2
could be used as an interpreter. All scripts used during build have
now been made compatible with Python 3, which means both major
releases of the language are fully supported.
</description>
</change>
<change>
<summary>
qemu: Provide ccw address support for graphics and input devices
</summary>
<description>
Support the virtio-gpu-ccw device as a video device and
virtio-{keyboard, mouse, tablet}-ccw devices as input devices
on S390.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
qemu: Add logging of guest crash information on S390
</summary>
<description>
On S390, when the guest crashes and QEMU exposes the guest crash
information, log the relevant data to the domain log file.
</description>
</change>
<change>
<summary>
qemu: use arp table of host to get the IP address of guests
</summary>
<description>
Find IP address of a VM by arp table on hosts.
If someone customizing IP address inside VM, it will be helpful.
</description>
</change>
<change>
<summary>
Xen: Remove hard-coded scheduler weight
</summary>
<description>
The libxl driver was accidentally hard-coding the per-domain
scheduler weight to 1000, silently ignoring any user-provided
<code>&lt;shares&gt;</code> in <code>&lt;cputune&gt;</code>. The
driver now honors <code>&lt;shares&gt;</code>, and defers setting
a default value to Xen. Note that the Xen default is 256, so any
domains started after this improvement will have one fourth the
shares of previously started domains. If all domains must have
equal CPU shares, administrators must manually set the weight of
previously started domains to 256, or restart them.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
qemu: TLS migration now enforces use of TLS for the NBD connection
</summary>
<description>
When the VIR_MIGRATE_TLS flag was used with the migration API libvirt
did not ensure that the NBD connection was using TLS as well. The code
now rejects such migration as the TLS transport for NBD is not ready
yet, but prevents a false sense of security that TLS would be used.
The support TLS for NBD will be added soon.
</description>
</change>
</section>
</release>
<release version="v4.1.0" date="2018-03-05">
<section title="New features">
<change>
<summary>
Added support for CAT (Cache allocation Technology)
</summary>
<description>
Domain vCPU threads can now have allocated some parts of host cache
using the <code>cachetune</code> element in <code>cputune</code>.
</description>
</change>
<change>
<summary>
Allow opening secondary drivers
</summary>
<description>
Up until now it was possible to connect to only hypervisor drivers
(e.g. qemu:///system, lxc:///, vbox:///system, and so on). The
internal drivers (like network driver, node device driver, etc.) were
hidden from users and users could use them only indirectly. Starting
with this release new connection URIs are accepted. For instance
network:///system, storage:///system and so on.
</description>
</change>
<change>
<summary>
virtlogd, virtlockd: Add support for admin protocol
</summary>
<description>
These two daemons now support admin protocol through which some admin
info can be gathered or some configuration tweaked on the fly.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
virsh: Enhance bash completion
</summary>
<description>
Implement more bash completions so that basic libvirt
objects can be auto-completed (e.g. networks,
interfaces, NWFilters, and so on).
</description>
</change>
<change>
<summary>
qemu: Use VIR_ERR_DEVICE_MISSING for various hotplug/detach messages
</summary>
</change>
<change>
<summary>
qemu: Allow showing the dump progress for memory only dump
</summary>
<description>
Alter the QEMU dump-guest-memory command processing to check
for and allow asynchronous completion which then allows for
the virsh dump --memory-only --verbose command to display percent
completion data.
</description>
</change>
<change>
<summary>
conf: add support for setting Chassis SMBIOS data fields
</summary>
</change>
<change>
<summary>
libxl: add support for setting clock offset and adjustment
</summary>
</change>
<change>
<summary>
Make port allocator global
</summary>
<description>
Up until now each driver had their own port allocator module. This
meant that info on port usage was not shared. Starting with this
release, the port allocator module is made global and therefore
drivers allocate ports from global pool.
</description>
</change>
<change>
<summary>
Fixed some compiler warnings that appear with GCC 8
</summary>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
qemu: Check for unsafe migration more thoroughly
</summary>
<description>
If a domain disk is stored on local filesystem (e.g. ext4) but is
not being migrated it is very likely that domain is not able to
run on destination. Regardless of share/cache mode.
</description>
</change>
<change>
<summary>
qemu: Fix updating device with boot order
</summary>
<description>
Starting with 3.7.0 release updating any device with boot order would
fail with 'boot order X is already used by another device' while in
fact it was the very same device.
</description>
</change>
<change>
<summary>
virlog: determine the hostname on startup CVE-2018-6764
</summary>
<description>
At later point it might not be possible or even safe to use
getaddrinfo(). It can in turn result in a load of NSS module which
can even be loaded from unsage guest filesystem and thus escape the
confinment of its container.
</description>
</change>
<change>
<summary>
qemu: Rework vCPU statistics fetching
</summary>
<description>
Fetching vCPU statistics was very expensive because it lead to waking
up vCPU threads in QEMU and thus it degraded performance. The code
was reworked so that fetching statistics does not wake up halted
vCPUs.
</description>
</change>
<change>
<summary>
qemu: unlink memory backing file on domain shutdown
</summary>
<description>
Depending on the filesystem where domain memory is stored, some files
might have been left behind. This is not a problem on hugetlbfs, but
it is a problem on regular filesystems like ext4.
</description>
</change>
<change>
<summary>
qemu: Fix shutting down domains in parallel
</summary>
<description>
If multiple domains were being shut down in parallel, libvirtd might
have deadlocked.
</description>
</change>
<change>
<summary>
nodedev: Update PCI mdev capabilities dynamically
</summary>
<description>
PCI devices may have other nested capabilities, like SRIOV and mdev
which depend on the device being plugged into the native vendor
driver. However, in case such a device is directly assigned to a guest
using VFIO driver, the device will naturally lose these capabilities
and libvirt needs to reflect that.
</description>
</change>
</section>
</release>
<release version="v4.0.0" date="2018-01-19">
<section title="New features">
<change>
<summary>
tools: Provide bash completion support
</summary>
<description>
Both <code>virsh</code> and <code>virt-admin</code> now implement
basic bash completion support.
</description>
</change>
<change>
<summary>
qemu: Refresh capabilities on host microcode update
</summary>
<description>
A microcode update can cause the CPUID bits to change; therefore,
the capabilities cache should be rebuilt when such an update is
detected on the host.
</description>
</change>
<change>
<summary>
lxc: Set hostname based on container name
</summary>
</change>
</section>
<section title="Improvements">
<change>
<summary>
CPU frequency reporting improvements
</summary>
<description>
The CPU frequency will now be reported by <code>virsh nodeinfo</code>
and other tools for s390 hosts; at the same time; CPU frequency has
been disabled on aarch64 hosts because there's no way to detect it
reliably.
</description>
</change>
<change>
<summary>
libxl: Mark domain0 as persistent
</summary>
</change>
<change>
<summary>
Xen: Add support for multiple IP addresses on interface devices
</summary>
</change>
<change>
<summary>
qemu: Add support for hot unplugging redirdev device
</summary>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
qemu: Enforce vCPU hotplug granularity constraints
</summary>
<description>
QEMU 2.7 and newer don't allow guests to start unless the initial
vCPUs count is a multiple of the vCPU hotplug granularity, so
validate it and report an error if needed.
</description>
</change>
</section>
</release>
<release version="v3.10.0" date="2017-12-04">
<section title="New features">
<change>
<summary>
conf: Support defining distances between virtual NUMA cells
</summary>
<description>
A NUMA hardware architecture supports the notion of distances
between NUMA cells. This can now be specified using the
<code>&lt;distances&gt;</code> element within the NUMA cell
configuration. Drivers which support this include Xen and QEMU.
</description>
</change>
<change>
<summary>
Xen: Support defining vNUMA topology
</summary>
<description>
Xen now supports defining a virtual NUMA topology for VMs,
including specifying distances between NUMA cells.
</description>
</change>
<change>
<summary>
qemu: Add the ability to configure HPT resizing for pSeries guests
</summary>
<description>
The user can now decide whether HPT (Hash Page Table) resizing
should be enabled, disabled or required instead of leaving it up to
hypervisor defaults and negotiation between the guest and the host.
</description>
</change>
<change>
<summary>
qemu: Add vmcoreinfo feature
</summary>
<description>
Starting with QEMU 2.11, the guest can save kernel debug
details when this feature is enabled and the kernel supports
it. It is useful to process kernel dump with KASLR enabled,
and also provides various kernel details to crash tools.
</description>
</change>
<change>
<summary>
conf: Move the auth and encryption definitions to disk source
</summary>
<description>
Allow parsing and formatting of the <code>auth</code> and
<code>encryption</code> sub-elements to be a child of the
<code>source</code> element. This will allow adding an
<code>auth</code> sub-element to a <code>backingStore</code>
or <code>mirror</code> elements as a means to track specific
authentication and/or encryption needs.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
vbox: Add VirtualBox 5.2 support
</summary>
</change>
<change>
<summary>
vbox: Add support for configuring storage controllers
</summary>
<description>
The VirtualBox driver now supports the <code>&lt;controller&gt;</code>
element in the domain XML for configuring storage controllers in VBOX
VMs. Additionally, libvirt's domain XML schema was updated to allow
optional <code>model</code> attribute for <code>&lt;controller
type='ide'&gt;</code> which is used by the VBOX driver to set the
IDE controller model to be one of 'piix4', 'piix4' (default), or
'ich6'. Finally, with this change <code>dumpxml</code> generates
<code>&lt;controller&gt;</code> elements that correspond to current
VBOX VM storage controller configuration.
</description>
</change>
<change>
<summary>
vbox: Add support for attaching empty removable disks
</summary>
<description>
The VirutalBox driver now supports adding CD-ROM and floppy disk
devices that do not have the disk source specified. Previously such
devices were silently ignored.
</description>
</change>
<change>
<summary>
vbox: Add support for attaching SAS storage controllers
</summary>
<description>
In VirtualBox, SCSI and SAS are distinct controller types whereas
libvirt does not make such distinction. Therefore, the VBOX driver was
updated to allow attaching SAS controllers via <code>&lt;controller
type='scsi' model='lsisas1068'&gt;</code> element. If there are
both SCSI and SAS controllers present in the VBOX VM, the domain XML
can associate the disk device using the <code>&lt;address&gt;</code>
element with the <code>controller</code> attribute, and optionally,
set the port via <code>unit</code> attribute.
</description>
</change>
<change>
<summary>
qemu: Generate predictable paths for qemu memory backends
</summary>
<description>
In some cases management applications need to know
paths passed to memory-backend-file objects upfront.
Libvirt now generates predictable paths so applications
can prepare the files if they need to do so.
</description>
</change>
<change>
<summary>
Shareable disks work properly with recent qemu
</summary>
<description>
Recent qemu versions added image locking to avoid potential corruption
of disk images. This broke shareable disks with libvirt since the
feature was turned on by default in qemu. Libvirt now enables sharing
of those disks in qemu so that the image locking is not applied in
that case. Additionally libvirt now checks that shareable disks have
supported format (raw) to avoid metadata corruption.
</description>
</change>
<change>
<summary>
Improve serial console behavior on non-x86 architectures
</summary>
<description>
ppc64, aarch64 and s390x guests were treating the &lt;serial&gt;
and &lt;console&gt; elements differently from x86, in some cases
presenting misleading information to the user. The behavior is now
consistent across all architectures and the information reported
is always accurate.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
vbox: Do not ignore failures to attach disk devices when defining
</summary>
<description>
The <code>define</code> now fails and reports an error if any of the
<code>controller</code> or <code>disk</code> devices specified in the
domain XML fail to attach to the VirtualBox VM.
</description>
</change>
<change>
<summary>
vbox: Fix dumpxml to always output disk devices
</summary>
<description>
The VirtualBox driver was ignoring any disk devices in
<code>dumpxml</code> output if there was a SAS storage controller
attached to the VM.
</description>
</change>
<change>
<summary>
vbox: Fix dumpxml to always generate valid domain XML
</summary>
<description>
When a VirtualBox VM has multiple disks attached, each to a different
storage controller that uses 'sd' prefix for block device names e.g.
one disk attached to SATA and one to SCSI controller, it no longer
generates XML where both would have 'sda' device name assigned.
Instead it properly assigns 'sda' and 'sdb' to those disks in the
order of appearance.
</description>
</change>
<change>
<summary>
Securely pass iSCSI authentication data
</summary>
<description>
Rather than supplying the authentication data as part of the
iSCSI URL for a disk or host device, utilize the encrypted
secret object to securely pass the authentication data.
</description>
</change>
</section>
</release>
<release version="v3.9.0" date="2017-11-02">
<section title="New features">
<change>
<summary>
Add capability to allow hot (un)plug of a domain watchdog device
</summary>
</change>
<change>
<summary>
Allow users to set device aliases
</summary>
<description>
Users can set aliases to domain devices and thus identify them
easily.
</description>
</change>
<change>
<summary>
qemu: Support multiqueue for virtio-blk
</summary>
<description>
Multiqueue support for <code>virtio-blk</code> has been available
in QEMU ever since 2.7.0, and now libvirt guests can enable it.
</description>
</change>
<change>
<summary>
Add virDomainSetLifecycleAction API
</summary>
<description>
Provided a new API to allow dynamic guest lifecycle control for
guest reactions to poweroff, restart, or crash type events related
to the domain XML <code>on_poweroff</code>, <code>on_reboot</code>,
and <code>on_crash</code> elements. The
<code>virsh set-lifecycle-action</code> command was created to
control the actions.
</description>
</change>
<change>
<summary>
qemu: Allow cold(un)plugging and hot(un)plugging input devices
</summary>
</change>
<change>
<summary>
net: Implement QoS for vhostuser
</summary>
</change>
</section>
<section title="Improvements">
<change>
<summary>
Allow a logical volume to be create using LUKS
</summary>
<description>
A logical volume may be created using an <code>encryption</code>
element using "luks" format. This does require a previously created
<code>secret</code> to store the passphrase used to encrypt the
volume Adding the volume to a domain can then either provide the
secret or allow the consumer in the guest to provide the passphrase
in order to decrypt the volume.
</description>
</change>
<change>
<summary>
net: Ignore auto-generated MAC address when detaching an interface
</summary>
<description>
If the MAC address has not been specified by the user, libvirt will
try and fill in the gaps by generating one; however, for some error
paths that led to some confusing error messages, so when an
auto-generated MAC address is specified the error message will not
include the auto-generated MAC.
</description>
</change>
<change>
<summary>
net: Enable MAC address lookup for virDomainInterfaceStats
</summary>
</change>
<change>
<summary>
apparmor: Several improvements
</summary>
<description>
Changes include permitting access to data about USB devices and
<code>dnsmasq</code> instances, allowing spaces in guest names and
many more.
</description>
</change>
<change>
<summary>
cpu: Use CPU information obtained from QEMU when possible
</summary>
<description>
Recent QEMU versions can expose information about which CPU models
are available and usable on the host; libvirt will now make use of
such information whenever possible.
</description>
</change>
<change>
<summary>
hyperv: Various improvements
</summary>
<description>
The error reported when clients can't connect to Hyper-V has been
made more descriptive, and memory limits for guests are now mapped
to more appropriate libvirt equivalents.
</description>
</change>
<change>
<summary>
qemu: Report QEMU error on failed migration
</summary>
<description>
Instead of reporting a generic error, ask QEMU for a more detailed
and thus hopefully more helpful one.
</description>
</change>
<change>
<summary>
vbox: Implement autoport for RDP
</summary>
<description>
libvirt will now obtain the (dynamically allocated) RDP port number
from VirtualBox itself, avoiding conflicts between multiple guests
wanting to use RDP at the same time.
</description>
</change>
<change>
<summary>
qemu: Allow rotation of small logs
</summary>
<description>
On a host where numerous unique instances are executed per day, it's
quite possible that, even though each of the single log files are
fairly small, collectively the quantity and volume may add tens of
thousands of log files to the <code>/var/log/libvirt/qemu/</code>
directory. Removing the constraints that log have to be bigger than
100 KiB before they can be rotated solves the issue.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
Fix swapped interface statistics and QoS
</summary>
<description>
Due to internal implementation, reported statistics for
some types of interfaces were swapped (RX appeared in
TX and vice versa). Similarly, QoS was set in reversed
way.
</description>
</change>
<change>
<summary>
Properly resize local LUKS encrypted volume
</summary>
<description>
Resizing of a local LUKS encrypted volume will now use qemu-img
to resize the volume. This will require configuring a secret for
the LUKS encrypted volume.
</description>
</change>
<change>
<summary>
qemu: Reserve PCI addresses for implicit i440fx devices
</summary>
<description>
Failing to do so causes the addresses to be considered usable by
libvirt, which means they could be assigned to more than one device
resulting in the guest failing to start.
</description>
</change>
<change>
<summary>
spec: Restart libvirtd only at the end of the upgrade process
</summary>
<description>
Use <code>%posttrans</code> to make sure <code>libvirtd</code>
is not restarted before all other components, such as the library
itself and storage / hypervisor drivers, have already been upgraded.
</description>
</change>
</section>
<section title="Security">
<change>
<summary>
qemu: Ensure TLS clients always verify the server certificate
</summary>
<description>
While it's reasonable to turn off client certificate validation,
as setting it up can be non-trivial, clients should always verify
the server certificate to avoid MITM attacks. However, libvirt was
using the same knob to control both checks, leading to
CVE-2017-1000256 / LSN-2017-0002.
</description>
</change>
</section>
</release>
<release version="v3.8.0" date="2017-10-04">
<section title="New features">
<change>
<summary>
qemu: Added support for cold-(un)plug of watchdog devices
</summary>
</change>
<change>
<summary>
qemu: Added support for setting IP address os usernet interfaces
</summary>
</change>
<change>
<summary>
qemu: Added support for Veritas Hyperscale (VxHS) block devices
</summary>
</change>
<change>
<summary>
storage: Added new events for pool-build and pool-delete
</summary>
</change>
</section>
<section title="Improvements">
<change>
<summary>
qemu: Set DAC permissions properly for spice rendernode
</summary>
<description>
When a <code>rendernode</code> path is set for SPICE GL on
<code>qemu:///system</code>, we now correctly set DAC permissions
on the device at VM startup. This is the last remaining hurdle to
let SPICE GL work for <code>qemu:///system</code> without any
external host changes.
</description>
</change>
<change>
<summary>
nodedev: Add switchdev offload query to NIC capabilities
</summary>
<description>
Allow querying the NIC interface capabilities for the
availability of switchdev offloading (also known as
kernel-forward-plane-offload).
</description>
</change>
<change>
<summary>
New CPU models for AMD and Intel
</summary>
<description>
AMD EPYC and Intel Skylake-Server CPU models were added together with
their features
</description>
</change>
<change>
<summary>
Improve long waiting when saving a domain
</summary>
<description>
While waiting for a write to disk to be finished, e.g. during save,
even simple operations like <code>virsh list</code> would be blocking
due to domain lock. This is now resolved by unlocking the domain
in places where it is not needed.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
Proper units are now used in virsh manpage for dom(mem)stats
</summary>
<description>
Previously the documentation used multiples of 1000, but now it is
fixed to use multiples of 1024.
</description>
</change>
<change>
<summary>
qemu: Fix error reporting when disk attachment fails
</summary>
<description>
There was a possibility for the actual error to be overridden or
cleared during the rollback.
</description>
</change>
<change>
<summary>
qemu: Fix assignment of graphics ports after daemon restart
</summary>
<description>
This could be seen with newer kernels that have bug regarding
SO_REUSEADDR. After libvirtd was restarted it could assign already
used address to new guests which would make them fail to start. This
is fixed by marking used ports unavailable when reconnecting to
running QEMU domains.
</description>
</change>
<change>
<summary>
Fix message decoding which was causing a very strange bug
</summary>
<description>
When parsing an RPC message with file descriptors was interrupted and
had to restart, the offset of the payload was calculated badly causing
strange issues like not being able to find a domain that was not
requested.
</description>
</change>
</section>
</release>
<release version="v3.7.0" date="2017-09-04">
<section title="New features">
<change>
<summary>
qemu: Add managedsave-edit commands
</summary>
<description>
Using managedsave-dumpxml, managedsave-define and managedsave-edit
commands, now we can dump and edit the XML configuration of domain
which has managedsave image.
</description>
</change>
<change>
<summary>
qemu: Add migrate-getmaxdowntime command
</summary>
<description>
Currently, the maximum tolerable downtime for a domain being migrated
is write-only from libvirt, via migrate-setmaxdowntime. This
implements a complementary migrate-getmaxdowntime command
</description>
</change>
<change>
<summary>
bhyve: Support autoport for VNC ports
</summary>
<description>
It's no longer necessary to explicitly specify VNC port for the bhyve
guests. With the autoport feature it will be allocated automatically.
Please refer to the bhyve driver documentation for examples.
</description>
</change>
<change>
<summary>
qemu: Added support for setting heads of virtio GPU
</summary>
</change>
<change>
<summary>
qemu: Added support to configure reconnect timeout for chardev devices
</summary>
<description>
When you have a TCP or UNIX chardev device and it's connected somewhere
you can configure reconnect timeout if the connection is closed.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
qemu: Report a clear error when dropping a VM during startup
</summary>
<description>
"Failed to load config for domain 'DOMNAME'" is now reported if a VM
config can't be parsed for some reason, and thus provides a clear
indication for users (and devs).
</description>
</change>
<change>
<summary>
apparmor: Update for QEMU 2.10 compatibility
</summary>
<description>
Starting with QEMU 2.10, disk images and NVRAM files get
automatically locked to prevent them from being corrupted; however,
file locking needs to be explicitly allowed through
<code>virt-aa-helper</code> or AppArmor will reject the requests and
the guest will not be able to run.
</description>
</change>
<change>
<summary>
virsh: List Unix sockets in 'domdisplay' output
</summary>
<description>
VNC and SPICE graphics can use Unix sockets instead of TCP/IP sockets
as connection endpoints, but such a configuration was not handled
correctly by <code>virsh domdisplay</code>, causing the respective
endpoints to be missing from the output.
</description>
</change>
<change>
<summary>
qemu: Don't check whether offline migration is safe
</summary>
<description>
Since offline migration only copies the guest definition to the
destination host, data corruption is not a concern and the operation
can always be performed safely.
</description>
</change>
<change>
<summary>
virt-host-validate: Fix IOMMU detection on ppc64
</summary>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
qemu: Better support for international domain names (with wide characters)
</summary>
<description>
There were some issues with multi-byte domains getting lost
on daemon restart due to truncation, so the code now handles
multi-byte names a bit better.
</description>
</change>
<change>
<summary>
qemu: Support long domain names with namespaces
</summary>
<description>
Domains with extremely long names would fail to start due to
temporary namespace paths being created with the whole name.
The path is now generated with shortened name instead.
</description>
</change>
<change>
<summary>
qemu: Tolerate missing emulator binary during libvirtd restart
</summary>
<description>
For some time libvirt required qemu capabilities being present when
parsing VM configs during startup. As a side effect VM configs would
fail to parse and thus vanish, if the emulator binary would be
uninstalled or broken. Libvirt now tolerates when capabilities
are missing during startup.
</description>
</change>
<change>
<summary>
qemu: Prevent pSeries guests from disappearing in some situations
</summary>
<description>
pSeries guest would disappear if any of the host devices they were
configured to use was not available during libvirtd startup, which
could easily happen for SR-IOV Virtual Functions. This scenario is
now handled correctly.
</description>
</change>
<change>
<summary>
qemu: Honor &lt;on_reboot/&gt; setting
</summary>
<description>
The setting was accepted by the parser, but not actually implemented.
</description>
</change>
<change>
<summary>
Fix --verbose option for all daemons
</summary>
<description>
Since v3.0.0, the option had been ignored by all libvirt daemons
(<code>libvirtd</code>, <code>virtlogd</code> and
<code>virtlockd</code>); it's now working as intended once again.
</description>
</change>
</section>
</release>
<release version="v3.6.0" date="2017-08-02">
<section title="New features">
<change>
<summary>
hyperv: Implement virDomainSetMemory and virDomainSendKey APIs
</summary>
</change>
<change>
<summary>
qemu: Support multiple PHBs for pSeries guests
</summary>
<description>
pSeries guests can now have multiple PHBs (PCI Host Bridges), which
show up as separate PCI domains in the guest. To create additional
PHBs, simply add PCI controllers with model <code>pci-root</code>
to the guest configuration.
</description>
</change>
<change>
<summary>
qemu: Isolate hostdevs on pSeries guests
</summary>
<description>
To enable better error reporting and recovery, unrelated hostdevs
will now be automatically isolated on pSeries guests by placing them
on separate PHBs (PCI Host Bridges).
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
qemu: platform serial devices can now use chardev features
</summary>
<description>
QEMU VMs that depend on platform serial devices can now use
QEMU's <code>-chardev</code> option, which enables access to
advanced features like log file configuration. This applies
to the default serial devices for arm, aarch64, and some ppc
configurations.
</description>
</change>
<change>
<summary>
Require use of GCC 4.4 or Clang compilers
</summary>
<description>
We only ever test libvirt with GCC or Clang (which
provides a GCC compatible compilation environment).
Between them, these compilers cover every supported
operating system platform, including Windows.
</description>
</change>
<change>
<summary>
qemu: shared disks with directsync cache should be safe for migration
</summary>
<description>
At present shared disks can be migrated with either readonly or
<code>cache=none</code>. But <code>cache=directsync</code> should be
safe for migration, because both <code>cache=directsync</code> and
<code>cache=none</code> don't use the host page cache, and
<code>cache=direct</code> write through qemu block layer cache.
</description>
</change>
<change>
<summary>
Handle hotplug change on VLAN configuration using OVS
</summary>
<description>
Libvirt was taught to handle VLAN change for running OVS interface.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
qemu: Use vCPU 'node-id' property and pass it back to qemu
</summary>
<description>
vCPU properties gathered from query-hotpluggable-cpus need to be
passed back to QEMU. As QEMU did not use the node-id property until
now and libvirt forgot to pass it back properly (it was parsed but
not passed around) we did not honor this.
</description>
</change>
<change>
<summary>
Miscellaneous stream fixes
</summary>
<description>
After introducing sparse stream features there were still some known
bugs left. Those are fixed in this release.
</description>
</change>
<change>
<summary>
qemu: Miscellaneous domain NS fixes
</summary>
<description>
Libvirt starts qemu domains in separate Linux namespaces for a while
now. However, there were still some bugs lingering. For instance
libvirt did not know how to handle file based bind mounts.
</description>
</change>
<change>
<summary>
Various CPU driver improvements
</summary>
<description>
There were some minor bugs when using 'host-model' CPU.
</description>
</change>
</section>
</release>
<release version="v3.5.0" date="2017-07-04">
<section title="New features">
<change>
<summary>
qemu: Add support for loadparm for a boot device
</summary>
<description>
Add an optional boot parameter 'loadparm' for a boot device.
Loadparm is an 8 byte parameter that, when present, is queried by
S390 guests via sclp or diag 308. Linux guests on S390 use it to
select a boot entry.
</description>
</change>
<change>
<summary>
Support controlling how video devices are exposed to the bhyve guests
</summary>
<description>
The <code>vgaconf</code> attribute was added to <code>video</code>'s
<code>driver</code> element. Possible values are: <code>on</code>,
<code>off</code>, and <code>io</code>. It controls the way how
bhyve exposes video devices to its guests; various guest OSes might
require different settings to boot properly.
</description>
</change>
<change>
<summary>
qemu: Add support for live updates of coalesce settings
</summary>
<description>
Users can now use <code>virsh update-device</code> to change
the coalesce settings of an interfaces while the domain is
running.
</description>
</change>
<change>
<summary>
qemu: Allow VirtIO devices to use vIOMMU
</summary>
<description>
It is now possible to turn on IOTBL for the vIOMMU and have VirtIO
devices use it, provided they have been configured appropriately.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
qemu: block copy job can be used with persistent domains
</summary>
<description>
Until now it was not possible to use block copy with persistent VMs.
In use cases where it's not required to recover the job after VM
shutdown, it's possible to specify VIR_DOMAIN_BLOCK_COPY_TRANSIENT_JOB
flag to start the copy job.
</description>
</change>
<change>
<summary>
JSON pseudo-protocol backing store parser supports new format of qemu 2.9
</summary>
<description>
QEMU 2.9 modified a few structures corresponding to the JSON format
of specifying a backing store for a disk image. Libvirt now implements
the new format.
</description>
</change>
<change>
<summary>
Capabilities now include info about host's CAT settings
</summary>
<description>
Various information about resource control from the host is
gathered and presented in capabilities if available.
</description>
</change>
<change>
<summary>
apparmor: Several improvements
</summary>
<description>
Allow access to Ceph config, EFI firmware on both x86_64 and
aarch64, device tree on ppc64 and more.
</description>
</change>
<change>
<summary>
qemu: Support host-model on POWER9 machines
</summary>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
qemu: snapshot: retrieve image metadata from user provided files
</summary>
<description>
Disk images of an external snapshot created with
VIR_DOMAIN_SNAPSHOT_CREATE_REUSE_EXT flag specified would not be
scanned for metadata after recent changes.
The metadata is necessary to allow keeping relative paths between
images when doing a block-commit.
</description>
</change>
<change>
<summary>
Parse decimal numbers in a locale-independent way
</summary>
<description>
Some locales, such as <code>de_DE</code> and <code>pt_BR</code>,
use comma rather than dot to separate the integer part from the
fractional part of a decimal number; however, several data sources
such as the kernel use a locale-independent representation and need
to be treated accordingly.
</description>
</change>
<change>
<summary>
Support compilation with newer compiler and libc versions
</summary>
<description>
Several fixes have been included to make compilation with Clang
4.0.0, GCC 7.1 and glibc >= 2.25.90 possible.
</description>
</change>
<change>
<summary>
qemu: Query name for vhost-user interfaces at runtime
</summary>
<description>
This makes it possible to use <code>virsh</code> subcommands such
as <code>domiflist</code> and <code>domifstat</code> on vhost-user
interfaces.
</description>
</change>
<change>
<summary>
qemu: Set MTU for hotplugged interfaces correctly
</summary>
<description>
When hotplugging a network interface, the MTU was only set on the
guest side. Set it on the host side as well.
</description>
</change>
<change>
<summary>
qemu: Forbid updating MTU for interfaces of running guests
</summary>
<description>
The MTU setting can't be modified while the guest is running, so any
attempt to alter it at runtime will now result in an error rather
than being silently ignored.
</description>
</change>
<change>
<summary>
qemu: Fix specifying QXL heads with older QEMU releases
</summary>
<description>
Specifying the number of QXL heads was not working correctly for
QEMU releases older than 1.6.
</description>
</change>
<change>
<summary>
qemu: Fix migration to older libvirt/QEMU versions
</summary>
<description>
When the guest is started, libvirt updates the CPU definition to
reflect the actual CPU features to enforce ABI. We need to send
original and updated CPU definition in order to support migration
to older libvirt/QEMU versions. Only the updated CPU definition
was sent to destination.
</description>
</change>
</section>
</release>
<release version="v3.4.0" date="2017-06-02">
<section title="New features">
<change>
<summary>
Improved streams to efficiently transfer sparseness
</summary>
<description>
New extension to virStream was implemented so that
virStorageVolDownload and virStorageVolUpload can preserve file
sparseness.
</description>
</change>
<change>
<summary>
I/O APIC type can be specified for QEMU/KVM domains
</summary>
<description>
The <code>ioapic</code> tag was added to domain
<code>features</code>, so the type of the I/O APIC can now
be specified (e.g. putting it in userspace for KVM domains).
</description>
</change>
<change>
<summary>
The reason for VM shutdown is reported, if known
</summary>
<description>
QEMU 2.10 will be able to report the reason for shutting
down (whether that was caused by the guest or not), and
libvirt is prepared for that and reports that information in
its shutdown event as well, if it is known.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
Repository now has new README.md file
</summary>
<description>
The new file uses markdown syntax, so it looks better on
github and possibly other web pages, but it has also more
useful information. The old README is now symlink to the
new file.
</description>
</change>
<change>
<summary>
qemu: Use GICv2 by default for aarch64/virt TCG guests
</summary>
<description>
The emulated GICv3 has some limitations that make it unusable as a
default; use GICv2 until they're sorted out. This change makes it
once again possible to run aarch64/virt guests on a x86_64 host
without having to tweak their configuration.
</description>
</change>
<change>
<summary>
Additional capabilities for the node_device module
</summary>
<description>
Introduce two new capabilities to the node_device module. The first
is for CCW devices, most common on the S390 architecture. The second
is for fibre channel-backed SCSI devices and exposes the
fc_remote_port sub-capability to SCSI target devices.
</description>
</change>
<change>
<summary>
Node devices now report Mediated device capabilities
</summary>
<description>
Endpoint devices support new <code>mdev</code> capability
and their parents now report the supported types in new
<code>mdev_types</code> capability.
</description>
</change>
<change>
<summary>
Capabilities now report information about host caches
</summary>
<description>
If supported in the kernel, host capabilities will now list
L3 caches. The code for other levels was added as well, but
only L3 caches are reported currently.
</description>
</change>
<change>
<summary>
POWER9 CPU model was added
</summary>
<description>
It is now properly reported in host capabilities.
</description>
</change>
<change>
<summary>
libxl: NUMA sibling distances are now reported in host capabilities
</summary>
</change>
<change>
<summary>
VMDK version 3 files are now properly detected
</summary>
</change>
<change>
<summary>
Interrupt remapping and Extended interrupt mode for IOMMU devices
</summary>
<description>
These two new features can now be controlled with new
<code>&lt;driver intremap='on/off' eim='on/off'/&gt;</code>
tag for <code>iommu</code> devices.
</description>
</change>
<change>
<summary>
Graphics in libxl domains now have default addresses
</summary>
<description>
Even though there were default addresses before this change,
they were not saved in the XML. It is now possible to see
and control the listen addresses properly.
</description>
</change>
<change>
<summary>
Default USB controllers are now added for devices in libxl domains
</summary>
<description>
Even though they were added automatically when USB device
was attached, they could've been missing in some other
cases. The logic is now fixed so there are always USB
controllers, even if there was none of them in the specified
XML.
</description>
</change>
<change>
<summary>
Limits for RPC messages were increased
</summary>
<description>
Hitting the RPC limits we have is easier every day, so they
were increased once again and some guessing logic was
improved as well. It is now possible to get more stats than
ever using the <code>virConnectGetAllDomainStats()</code>
call and push through even bigger requests and replies for
all APIs.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
qemu: Create memory_backing_dir on startup
</summary>
<description>
Libvirt's policy is that directories are created on startup if
they don't exist. We've missed this one.
</description>
</change>
<change>
<summary>
PCIe 4.0 cards now report proper link speeds
</summary>
<description>
It could happen that the link speed for PCIe devices was not
properly reported or the nodedev-dumpxml just failed. That
was due to mistake in the field width, but should now work
properly.
</description>
</change>
<change>
<summary>
qemu: Do not report errors on shutdown
</summary>
<description>
For some users, in some rare cases, it could happen that
there was an error message "internal error: End of file from
qemu monitor" in the logs even though no problem happened.
The detection of these false positives was improved and such
errors should not show any more.
</description>
</change>
<change>
<summary>
User-specified UNIX socket paths for virtio channels should not be reset
</summary>
<description>
It could happen, in some cases, that libvirt would mistake a
user-specified path for its own generated one and thus
remove it from the XML. The detection of such addresses was
improved now.
</description>
</change>
<change>
<summary>
Fix address reservation during RNG hot-plug
</summary>
<description>
When error occurred in a specific point in time during the
hot-plug of an RNG device, it could happen that an address
was released even though another device was already using
it, making it possible to hot-plug another device with that
address, effectively having duplicated addresses in the XML.
</description>
</change>
</section>
</release>
<release version="v3.3.0" date="2017-05-05">
<section title="New features">
<change>
<summary>
net: Add support for coalesce settings
</summary>
<description>
Enabling data batching through these settings can improve network
performance for guests.
</description>
</change>
<change>
<summary>
qemu: Add support for guest CPU cache specification
</summary>
<description>
This features allows fine-grained control of the cache behavior
of the guest CPU.
</description>
</change>
<change>
<summary>
qemu: Add support for the qemu-xhci USB controller
</summary>
</change>
</section>
<section title="Improvements">
<change>
<summary>
hyperv: Support Hyper-V 2012 and newer
</summary>
<description>
Starting with Hyper-V 2012 the API has changed causing the existing
driver to be unable to send and process requests properly. This has
been resolved by adding abstractions to handle the differences and
ease handling such breaks if they happen in the future.
</description>
</change>
<change>
<summary>
libxl: Add support for nested HVM domains
</summary>
<description>
Xen has supported nested HVM domains since version 4.4. The
libvirt libxl driver now supports nested HVM domains by
specifying the host-passthrough CPU mode when defining a
domain.
</description>
</change>
<change>
<summary>
qemu: Implement ACPI support for aarch64 guests
</summary>
<description>
Up until this point, ACPI support was only advertised for x86_64
guests and disabling it for aarch64 guests was not possible at all.
</description>
</change>
<change>
<summary>
vz: Add support for changing the number of vCPUs
</summary>
</change>
<change>
<summary>
qemu: Automatically choose the best USB controller for guests
</summary>
<description>
The recently introduced qemu-xhci USB controller is the best choice
for both ppc64 and aarch64 guests, so use it by default on those
architectures if available.
</description>
</change>
<change>
<summary>
daemon: Increase default task limit for libvirtd
</summary>
<description>
The default number of tasks for the pids cgroup controller is 512,
which libvirtd can quickly bump into when starting lots of guests.
Raise the limit to a more reasonable 32768.
</description>
</change>
<change>
<summary>
docs: Include man pages describing key code names and values
</summary>
</change>
<change>
<summary>
virsh: Report initialization errors
</summary>
<description>
Sometimes virsh might be unable to start: when that happens, report
useful diagnostics instead of failing silently.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
nss: Don't require a network restart for libvirt_guest
</summary>
<description>
Previously, the libvirt_guest NSS module would only work properly
after the corresponding network had been restarted; now newly
started guests will be reported correctly right away.
</description>
</change>
<change>
<summary>
storage: Remove unavailable transient pools after restart
</summary>
<description>
Solve an issue where transient storage pools would be stuck in an
unmanageable state if the source disappeared and libvirtd was
subsequently restarted.
</description>
</change>
<change>
<summary>
storage: Fix capacity value for LUKS encrypted volumes
</summary>
<description>
The 'capacity' value (e.g. guest logical size) for a LUKS volume is
smaller than the 'physical' value of the file in the file system, so
we need to account for that.
</description>
</change>
<change>
<summary>
qemu: Fix regression when hyperv/vendor_id feature is used
</summary>
<description>
Guests using the feature would not be started at all; it is now
possible to start them as expected.
</description>
</change>
<change>
<summary>
qemu: Do not crash on USB address with no port and invalid bus
</summary>
</change>
<change>
<summary>
crypto: Always pad data before encrypting it
</summary>
<description>
If this step is not performed, when the data length matches the
chunk size the decryption routines will misinterpret the last byte
of data as the padding length and fail to decode it correctly.
</description>
</change>
</section>
</release>
<release version="v3.2.0" date="2017-04-02">
<section title="New features">
<change>
<summary>
The virt-host-validate tool now supports bhyve hypervisor
</summary>
</change>
<change>
<summary>
Introduce NVDIMM memory model
</summary>
<description>
NVDIMM is new type of memory introduced into QEMU 2.6. The idea is
that we have a non-volatile memory module that keeps the data
persistent across domain reboots and offers much faster data
accesses. However, due to a bug in QEMU, this feature is not enabled
for QEMUs older than 2.9.0.
</description>
</change>
<change>
<summary>
qemu: Introduce support for generic PCIe Root Ports
</summary>
<description>
For new controllers, a generic device (pcie-root-port) will be used
by default instead of the Intel-specific device (ioh3420), provided
the QEMU binary supports it.
</description>
</change>
<change>
<summary>
qemu: Add support for checking guest CPU ABI compatibility
</summary>
<description>
When migrating a domain to a different host, restoring a domain from
a file or reverting a snapshot libvirt will make sure the guest CPU
QEMU presents to the guest OS exactly matches the one provided on
the source host (or before the domain's state was saved). This
enhanced check may also be requested when starting a new domain to
ensure the virtual CPU exactly matches the one specified in the XML.
</description>
</change>
<change>
<summary>
qemu: Add support to migrate using TLS
</summary>
<description>
Add the ability to migrate QEMU guests using TLS via a new flag
VIR_MIGRATE_TLS or virsh migrate '--tls' option. Requires using at
least QEMU 2.9.0 in order to work properly.
</description>
</change>
<change>
<summary>
qemu: add mediated devices framework support
</summary>
<description>
Recent kernel version introduced new mediated device framework, so
provide an initial support of this framework for libvirt, mainly by
introducing a new host device type in the XML.
</description>
</change>
<change>
<summary>
qemu: Add support for setting TSC frequency
</summary>
<description>
Setting TSC frequency is required to enable migration for domains
with 'invtsc' CPU feature turned on.
</description>
</change>
<change>
<summary>
Add support for block device threshold event
</summary>
<description>
When using thin provisioning, management tools need to resize the
disk in certain cases. To avoid having them to poll disk usage
this version introduces an event which will be fired when a given
offset of the storage is written by the hypervisor. Together with the
API it allows registering thresholds for given storage backing
volumes and this event will then notify management if the threshold
is exceeded. Currently only the qemu driver supports this.
</description>
</change>
<change>
<summary>
bhyve: Add support for UEFI boot ROM, VNC, and USB tablet
</summary>
<description>
The bhyve driver now supports booting using the UEFI boot ROM,
so non-FreeBSD guests that support UEFI could be booted without
using an external boot loader like grub-bhyve. Video is also
supported now, allowing to connect to guests via VNC and use
an USB tablet as an input device. Please refer to
the driver page for domain XML examples.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
qemu: Detect host CPU model by asking QEMU on x86_64
</summary>
<description>
Previously, libvirt detected the host CPU model using CPUID
instruction, which caused libvirt to detect a lot of CPU features
that are not supported by QEMU/KVM. Asking QEMU makes sure we
don't start it with unsupported features.
</description>
</change>
<change>
<summary>
perf: Add more perf statistics
</summary>
<description>
Add support to get the count of cpu clock time, task clock time,
page faults, context switches, cpu migrations, minor page faults,
major page faults, alignment faults, emulation faults by
applications running on the platform.
</description>
</change>
<change>
<summary>
Write hyperv crash information into vm log
</summary>
<description>
qemu's implementation of the hyperv panic notifier now reports
information about the crash from the guest os. Starting with this
version, libvirt logs the information to the vm log file for possible
debugging.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
QEMU: Use adaptive timeout for connecting to monitor
</summary>
<description>
When starting qemu, libvirt waits for qemu to create the monitor
socket which libvirt connects to. Historically, there was sharp 30
second timeout after which the qemu process was killed. This
approach is suboptimal as in some scenarios with huge amounts of
guest RAM it can take a minute or more for kernel to allocate and
zero out pages for qemu. The timeout is now flexible and computed by
libvirt at domain startup.
</description>
</change>
<change>
<summary>
Overwrite (clear) 2 KB instead of just 512 bytes when initializing logical device
</summary>
</change>
<change>
<summary>
Describe the logical backend requirements better for pool-create-as
</summary>
</change>
</section>
</release>
<release version="v3.1.0" date="2017-03-03">
<section title="New features">
<change>
<summary>
storage: Add Virtuozzo storage backend storage pool
</summary>
<description>
Add new storage backend to support pool and volume management
within the Virtuozzo Storage environment. Virtuozzo Storage is
a highly available distributed software defined storage with
built-in replication and disaster recovery.
</description>
</change>
<change>
<summary>
qemu: Add support for memory backing with file source
</summary>
<description>
Add support in numa topology for file source inside memory backing
(hugepages are not needed) Three new elements
&lt;source/&gt;,&lt;access/&gt; and &lt;allocation/&gt; were added
to &lt;memoryBacking/&gt; element. Also new configuration parameter
<code>memory_backing_dir</code> was added to qemu.conf.
</description>
</change>
<change>
<summary>
network: make openvswitch call timeout configurable
</summary>
<description>
Adding the ability to specify the timeout value in seconds for
openvswitch calls in the libvirtd configuration file.
</description>
</change>
<change>
<summary>
bhyve: add e1000 NIC support
</summary>
<description>
Add support for e1000 NIC. Previously, the only available option
was <code>virtio-net</code>.
</description>
</change>
<change>
<summary>
libxl: add tunneled migration support
</summary>
<description>
Add tunneled migration to libxl driver, which is always capable of
strong encryption and doesn't require any extra network connection
other than what's required for remote access of libvirtd.
</description>
</change>
<change>
<summary>
qemu: add rendernode argument
</summary>
<description>
Add a new attribute 'rendernode' to &lt;gl&gt; spice element.
</description>
</change>
<change>
<summary>
nodedev: add drm capability
</summary>
<description>
Add a new 'drm' capability for Direct Rendering Manager (DRM)
devices, providing device type information.
</description>
</change>
<change>
<summary>
Add API for individual/specific vCPU hotplug
</summary>
<description>
The new API allows selecting specific vCPUs to be added/removed from
the VM. The existing APIs allowed only adding/removing from the end
which did not play well with NUMA.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
virsh: pool-list: allow both --uuid and --name in one command
</summary>
<description>
Adjust the virsh-pool command to support the --uuid and/or --name
options in order to print just the --name and/or --uuid of pools.
</description>
</change>
<change>
<summary>
Introduce MTU to domain &lt;interface/&gt; and &lt;network&gt;
</summary>
<description>
Allow setting MTU size for some types of domain interface
and network.
</description>
</change>
<change>
<summary>
libxl: improve support for &lt;timer&gt; configurations
</summary>
<description>
Add support for multiple timers. Extend the tsc timer to
support the emulate mode. Improve conversion of timer XML
to/from xl.cfg.
</description>
</change>
<change>
<summary>
storage: modularize the storage driver
</summary>
<description>
Split up the storage driver backends into loadable modules so that
binary distributions don't have to compromise on shipping the storage
driver with all backends which may pull in too many dependencies.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
nodedev: Fabric name must not be required for fc_host capability
</summary>
<description>
fabric_name is one of many fc_host attributes in Linux that is
optional and left to the low-level driver to decide if it is
implemented. For example the zfcp device driver does not provide a
fabric name for an fcp host. The requirement for the existence of
a fabric name has been removed by making it optional.
</description>
</change>
<change>
<summary>
bhyve: change address allocation schema for SATA disks
</summary>
<description>
Previously, the bhyve driver assigned PCI addresses to SATA disks
directly rather than assigning that to a controller and
using SATA addresses for disks. It was implemented this way
because bhyve has no notion of an explicit SATA controller.
However, as this doesn't match libvirt's understanding of
disk addresses, the bhyve driver was changed to follow
the common schema and have PCI addresses for SATA controllers
and SATA addresses for disks. If you're having issues
because of this, it's recommended to edit the domain's XML
and remove &lt;address type='pci'&gt; from the &lt;disk&gt;
elements with &lt;target bus='sata'/&gt; and let libvirt
regenerate it properly.
</description>
</change>
<change>
<summary>
libxl: maximum memory fixes
</summary>
<description>
Fix reporting of domain maximum memory. Fix setting dom0
maximum memory.
</description>
</change>
<change>
<summary>
libxl: fix disk detach when &lt;driver&gt; not specified
</summary>
</change>
<change>
<summary>
libxl: fix dom0 autoballooning with Xen 4.8
</summary>
</change>
<change>
<summary>
qemu: Allow empty script path to &lt;interface/&gt;
</summary>
<description>
Historically, this was always allowed. Unfortunately, due to some
rework done for 1.3.2 release a bug was dragged in which suddenly
stop allowing domain with such configuration to start.
</description>
</change>
</section>
</release>
<release version="v3.0.0" date="2017-01-17">
<section title="New features">
<change>
<summary>
Domain events for metadata content changes
</summary>
<description>
The domain events framework has a new event ID that can
be used to get notifications when domain metadata content
changes.
</description>
</change>
<change>
<summary>
Event notifications for the secret object
</summary>
<description>
The secret object now supports event notifications, covering
lifcycle changes and secret value changes.
</description>
</change>
<change>
<summary>
New localPtr attribute for "ip" element in network XML
</summary>
</change>
<change>
<summary>
qemu: Support QEMU group I/O throttling
</summary>
<description>
Add the capability to allow group I/O throttling via a new
domain &lt;disk&gt; &lt;iotune&gt; subelement "group_name"
to allow sharing I/O throttling quota between multiple drives.
</description>
</change>
<change>
<summary>
nss: Introduce libvirt_guest
</summary>
<description>
New <code>libvirt_guest</code> nss module that translates libvirt
guest names into IP addresses.
</description>
</change>
<change>
<summary>
daemon: Add support for runtime logging settings adjustment
</summary>
<description>
Logging-related settings like log outputs and filters can now be
adjusted during runtime using the admin interface without the
necessity of the daemon's restart.
</description>
</change>
<change>
<summary>
storage: Add virStorageVolInfoFlags API
</summary>
<description>
Add the API to support using the VIR_STORAGE_VOL_GET_PHYSICAL
flag in order to return the host physical size in bytes
of the image container in the allocation field of the
_virStorageVolInfo structure. The --physical flag has been
added to the virsh vol-info command to access the data.
</description>
</change>
<change>
<summary>
libxl: Implement virDomainGetMaxVcpus API
</summary>
</change>
<change>
<summary>
storage: Add overwrite flag checking for logical pool
</summary>
<description>
Add support for the OVERWRITE flags for the logical storage
backend including checking for existing data on the target
volumes when building a new logical pool on target volume(s).
</description>
</change>
<change>
<summary>
qemu: Add support for guest CPU configuration on s390(x)
</summary>
</change>
</section>
<section title="Improvements">
<change>
<summary>
perf: Add more perf statistics
</summary>
<description>
Add support to get the count of branch instructions
executed, branch misses, bus cycles, stalled frontend
cpu cycles, stalled backend cpu cycles, and ref cpu
cycles by applications running on the platform.
</description>
</change>
<change>
<summary>
conf: Display &lt;physical&gt; for volume xml
</summary>
<description>
Add a display of the &lt;physical&gt; size of a disk
volume in the output of the volume XML.
</description>
</change>
<change>
<summary>
qemu: Use virtio-pci by default for aarch64 mach-virt guests
</summary>
<description>
virtio-pci provides several advantages over virtio-mmio, such
as the ability to hotplug devices and improved performance.
While opting in to virtio-pci has been possible for a while,
newly-defined guests will now use it automatically.
</description>
</change>
<change>
<summary>
vbox: remove support for VirtualBox 3.x and older
</summary>
<description>
Those old VirtualBox versions have been unsupported by
upstream for a long time and the API of 4.0 and newer has
diverged enough to require code abstractions to handle differences.
Removing support for those old versions drops lots of code from
the driver and simplifies the logic to ease implementation of new
features going forward.
</description>
</change>
<change>
<summary>
virsh: pool-info: introduce option --bytes
</summary>
<description>
Add option --bytes to virsh pool-info in order ti allow display
of units in bytes rather than default of human readable output.
</description>
</change>
<change>
<summary>
scsi: Add parent wwnn/wwpn or fabric capability for createVport
</summary>
<description>
Improve the algorithm searching for the parent scsi_host device
for vHBA/NPIV scsi_host creation. Rather than supplying the
"parent" by name, it's now possible to define the parent by
it's wwnn/wwpn or fabric_wwn in the node device create XML or
the storage pool XML.
</description>
</change>
<change>
<summary>
qemu: aggregate pcie-root-ports onto multiple functions of a slot
</summary>
<description>
When pcie-root-ports are added to pcie-root in order to
provide a place to connect PCI Express endpoint devices,
libvirt now aggregates multiple root ports together onto the
same slot (up to 8 per slot) in order to conserve slots.
Using this method, it's possible to connect more than 200
endpoint devices to a guest that uses PCIe without requiring
setup of any PCIe switches.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
lxc: fix accidental killing of containers during libvirtd restart
</summary>
<description>
The libvirt_lxc process was previously not moved into the
container scope. As a result, if systemd reloads its config
after a container is started, when libvirtd is later restarted
it will accidentally kill the containers.
</description>
</change>
<change>
<summary>
qemu: Correct GetBlockInfo values
</summary>
<description>
For an active domain, correct the physical value provided for
a raw sparse file backed storage and the allocation value provided
for a qcow2 file backed storage that hasn't yet been opened on
the domain.
</description>
</change>
<change>
<summary>
qemu: Make virtio console usable on ppc64 guests
</summary>
<description>
The chardev detection code has been improved and can now handle this
configuration properly.
</description>
</change>
<change>
<summary>
qemu: Enable mount namespace
</summary>
<description>
To avoid funny races with udev relabelling devices under our hands and
to enhance security, libvirt now spawns each qemu process with its own
<code>/dev</code>.
</description>
</change>
<change>
<summary>
storage: Fix implementation of no-overwrite for file system backend
</summary>
<description>
Fix file system storage backend implementation of the OVERWRITE
flags to be consistent between code and documentation. Add checks
to ensure that when building a new file system on a target volume
that there is not something already on the disk in a format that
libvirt can recognize.
</description>
</change>
<change>
<summary>
qemu: Create hugepage path on per domain basis
</summary>
<description>
Historically, all hugepage enabled domains shared the same path under
hugetlbfs. This left libvirt unable to correctly set security labels
on it. With this release, however, each domain is put into a
separate path which is also correctly labeled.
</description>
</change>
<change>
<summary>
conf: Reject domains with duplicate drive addresses
</summary>
<description>
Reject duplicate drive addresses for disks and hostdevs at
domain definition.
</description>
</change>
<change>
<summary>
libxl: reverse defaults on HVM net device attach
</summary>
<description>
Fixes network interface attach for HVM domains when no model is
specified. Emulated hotplug isn't yet supported and hence we should
default to the general working scenario.
</description>
</change>
<change>
<summary>
libxl: always enable pae for x86_64 HVM
</summary>
<description>
By default pae is disabled in libxl. Without an explicit &lt;pae/&gt;
setting in the domain &lt;features&gt; configuration, an x86_64 HVM
domain would be get an i686 environment. pae should always be enabled
for x86_64 HVM domains.
</description>
</change>
<change>
<summary>
qemu: Fix XML dump of autogenerated websocket
</summary>
<description>
As a result autogenerated websocket port is regenerated on domain restore,
migration and such as it should be.
</description>
</change>
</section>
</release>
<release version="v2.5.0" date="2016-12-04">
<section title="New features">
<change>
<summary>
shmem: Add support for additional models
</summary>
<description>
The shmem device can now utilize QEMU's ivshmem-plain and
ivshmem-doorbell, more modern versions of ivshmem.
</description>
</change>
<change>
<summary>
vbox: Add VirtualBox 5.1 support
</summary>
</change>
<change>
<summary>
libssh: New transport
</summary>
<description>
The new libssh transport allows one to connect to a running
libvirtd via SSH, using the libssh library; for example:
<code>qemu+libssh://server/system</code>.
</description>
</change>
<change>
<summary>
vhost-scsi: Add support scsi_host hostdev passthrough
</summary>
<description>
Add the capability to pass through a scsi_host HBA and the
associated LUNs to the guest.
</description>
</change>
<change>
<summary>
Allow debugging of gluster volumes in qemu
</summary>
<description>
Users can now enable debug logging for native gluster
volumes in qemu using the "gluster_debug_level" option in qemu.conf
</description>
</change>
<change>
<summary>
Pre-allocate memory slots for memory hotplug
</summary>
<description>
Slot numbers for memory devices are now automatically allocated and
thus persistent. In addition slot numbers can be specified without
providing a base address, which simplifies user configuration
</description>
</change>
<change>
<summary>
qemu: Express devices will be placed on PCIe bus by default
</summary>
<description>
For machine types that use a PCI Express root bus
(e.g. x86_64/Q35 and aarch64/virt), any unaddressed PCI
device that is an Express device (all virtio-1.0 devices,
e1000e, nec-xhci, vfio assigned devices) will be placed on
an Express controller (i.e. a pcie-root-port) instead of a
legacy PCI controller (i.e. pci-bridge) with the root ports
added as needed.
</description>
</change>
</section>
<section title="Improvements">
<change>
<summary>
docs: Better documentation for migration APIs and flags
</summary>
</change>
<change>
<summary>
vbox: Address thread safety issues
</summary>
</change>
<change>
<summary>
virsh: Add support for passing an alternative persistent XML to migrate command
</summary>
</change>
<change>
<summary>
vhostuser: Allow hotplug of multiqueue devices
</summary>
</change>
<change>
<summary>
NEWS: Switch to an improved format
</summary>
<description>
List user-visible changes instead of single commits for a better
high-level overview of differences between libvirt releases.
</description>
</change>
<change>
<summary>
website: Modernize layout and branding
</summary>
<description>
The libvirt website looked very cluttered and outdated; it has now
been completely overhauled, resulting in a design that's better
organized and more pleasant to look at.
</description>
</change>
</section>
<section title="Bug fixes">
<change>
<summary>
vz: Fix migration in P2P mode
</summary>
</change>
<change>
<summary>
Forbid newline character in names of some libvirt objects
</summary>
</change>
<change>
<summary>
Fix compilation on macOS
</summary>
</change>
</section>
</release>
</libvirt>
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