libvirt releases
================
# v3.8.0 (unreleased)
* New features
* Improvements
- qemu: Set DAC permissions properly for spice rendernode
When a rendernode path is set for SPICE GL on qemu:///system, we now
correctly set DAC permissions on the device at VM startup. This is the
last remaining hurdle to let SPICE GL work for qemu:///system without
any external host changes.
- nodedev: Add switchdev offload query to NIC capabilities
Allow querying the NIC interface capabilities for the availability of
switchdev offloading (also known as kernel-forward-plane-offload).
* Bug fixes
# v3.7.0 (2017-09-04)
* New features
- qemu: Add managedsave-edit commands
Using managedsave-dumpxml, managedsave-define and managedsave-edit
commands, now we can dump and edit the XML configuration of domain
which has managedsave image.
- qemu: Add migrate-getmaxdowntime command
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
- bhyve: Support autoport for VNC ports
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.
- qemu: Added support for setting heads of virtio GPU
- qemu: Added support to configure reconnect timeout for chardev devices
When you have a TCP or UNIX chardev device and it's connected somewhere
you can configure reconnect timeout if the connection is closed.
* Improvements
- qemu: Report a clear error when dropping a VM during startup
"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).
- apparmor: Update for QEMU 2.10 compatibility
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 virt-aa-helper or AppArmor will
reject the requests and the guest will not be able to run.
- virsh: List Unix sockets in 'domdisplay' output
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 virsh domdisplay, causing the respective endpoints to be
missing from the output.
- qemu: Don't check whether offline migration is safe
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.
- virt-host-validate: Fix IOMMU detection on ppc64
* Bug fixes
- qemu: Better support for international domain names (with wide
characters)
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.
- qemu: Support long domain names with namespaces
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.
- qemu: Tolerate missing emulator binary during libvirtd restart
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.
- qemu: Prevent pSeries guests from disappearing in some situations
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.
- qemu: Honor <on_reboot/> setting
The setting was accepted by the parser, but not actually implemented.
- Fix --verbose option for all daemons
Since v3.0.0, the option had been ignored by all libvirt daemons
(libvirtd, virtlogd and virtlockd); it's now working as intended once
again.
# v3.6.0 (2017-08-02)
* New features
- hyperv: Implement virDomainSetMemory and virDomainSendKey APIs
- qemu: Support multiple PHBs for pSeries guests
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 pci-root to the guest
configuration.
- qemu: Isolate hostdevs on pSeries guests
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).
* Improvements
- qemu: platform serial devices can now use chardev features
QEMU VMs that depend on platform serial devices can now use QEMU's
-chardev 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.
- Require use of GCC 4.4 or Clang compilers
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.
- qemu: shared disks with directsync cache should be safe for migration
At present shared disks can be migrated with either readonly or
cache=none. But cache=directsync should be safe for migration, because
both cache=directsync and cache=none don't use the host page cache, and
cache=direct write through qemu block layer cache.
- Handle hotplug change on VLAN configuration using OVS
Libvirt was taught to handle VLAN change for running OVS interface.
* Bug fixes
- qemu: Use vCPU 'node-id' property and pass it back to qemu
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.
- Miscellaneous stream fixes
After introducing sparse stream features there were still some known
bugs left. Those are fixed in this release.
- qemu: Miscellaneous domain NS fixes
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.
- Various CPU driver improvements
There were some minor bugs when using 'host-model' CPU.
# v3.5.0 (2017-07-04)
* New features
- qemu: Add support for loadparm for a boot device
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.
- Support controlling how video devices are exposed to the bhyve guests
The vgaconf attribute was added to video's driver element. Possible
values are: on, off, and io. It controlls the way how bhyve exposes
video devices to its guests; various guest OSes might require different
settings to boot properly.
- qemu: Add support for live updates of coalesce settings
Users can now use virsh update-device to change the coalesce settings
of an interfaces while the domain is running.
- qemu: Allow VirtIO devices to use vIOMMU
It is now possible to turn on IOTBL for the vIOMMU and have VirtIO
devices use it, provided they have been configured appropriately.
* Improvements
- qemu: block copy job can be used with persistent domains
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.
- JSON pseudo-protocol backing store parser supports new format of qemu 2.9
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.
- Capabilities now include info about host's CAT settings
Various information about resource control from the host is gathered
and presented in capabilities if available.
- apparmor: Several improvements
Allow access to Ceph config, EFI firmware on both x86_64 and aarch64,
device tree on ppc64 and more.
- qemu: Support host-model on POWER9 machines
* Bug fixes
- qemu: snapshot: retrieve image metadata from user provided files
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.
- Parse decimal numbers in a locale-independent way
Some locales, such as de_DE and pt_BR, 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.
- Support compilation with newer compiler and libc versions
Several fixes have been included to make compilation with Clang 4.0.0,
GCC 7.1 and glibc >= 2.25.90 possible.
- qemu: Query name for vhost-user interfaces at runtime
This makes it possible to use virsh subcommands such as domiflist and
domifstat on vhost-user interfaces.
- qemu: Set MTU for hotplugged interfaces correctly
When hotplugging a network interface, the MTU was only set on the guest
side. Set it on the host side as well.
- qemu: Forbid updating MTU for interfaces of running guests
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.
- qemu: Fix specifying QXL heads with older QEMU releases
Specifying the number of QXL heads was not working correctly for QEMU
releases older than 1.6.
- qemu: Fix migration to older libvirt/QEMU versions
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.
# v3.4.0 (2017-06-02)
* New features
- Improved streams to efficiently transfer sparseness
New extension to virStream was implemented so that
virStorageVolDownload and virStorageVolUpload can preserve file
sparseness.
- I/O APIC type can be specified for QEMU/KVM domains
The ioapic tag was added to domain features, so the type of the I/O
APIC can now be specified (e.g. putting it in userspace for KVM
domains).
- The reason for VM shutdown is reported, if known
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.
* Improvements
- Repository now has new README.md file
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.
- qemu: Use GICv2 by default for aarch64/virt TCG guests
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.
- Additional capabilities for the node_device module
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.
- Node devices now report Mediated device capabilities
Endpoint devices support new mdev capability and their parents now
report the supported types in new mdev_types capability.
- Capabilities now report information about host caches
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.
- POWER9 CPU model was added
It is now properly reported in host capabilities.
- libxl: NUMA sibling distances are now reported in host capabilities
- VMDK version 3 files are now properly detected
- Interrupt remapping and Extended interrupt mode for IOMMU devices
These two new features can now be controlled with new <driver
intremap='on/off' eim='on/off'/> tag for iommu devices.
- Graphics in libxl domains now have default addresses
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.
- Default USB controllers are now added for devices in libxl domains
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.
- Limits for RPC messages were increased
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
virConnectGetAllDomainStats() call and push through even bigger
requests and replies for all APIs.
* Bug fixes
- qemu: Create memory_backing_dir on startup
Libvirt's policy is that directories are created on startup if they
don't exist. We've missed this one.
- PCIe 4.0 cards now report proper link speeds
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.
- qemu: Do not report errors on shutdown
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.
- User-specified UNIX socket paths for virtio channels should not be reset
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.
- Fix address reservation during RNG hot-plug
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.
# v3.3.0 (2017-05-05)
* New features
- net: Add support for coalesce settings
Enabling data batching through these settings can improve network
performance for guests.
- qemu: Add support for guest CPU cache specification
This features allows fine-grained control of the cache behavior of the
guest CPU.
- qemu: Add support for the qemu-xhci USB controller
* Improvements
- hyperv: Support Hyper-V 2012 and newer
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.
- libxl: Add support for nested HVM domains
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.
- qemu: Implement ACPI support for aarch64 guests
Up until this point, ACPI support was only advertised for x86_64 guests
and disabling it for aarch64 guests was not possible at all.
- vz: Add support for changing the number of vCPUs
- qemu: Automatically choose the best USB controller for guests
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.
- daemon: Increase default task limit for libvirtd
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.
- docs: Include man pages describing key code names and values
- virsh: Report initialization errors
Sometimes virsh might be unable to start: when that happens, report
useful diagnostics instead of failing silently.
* Bug fixes
- nss: Don't require a network restart for libvirt_guest
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.
- storage: Remove unavailable transient pools after restart
Solve an issue where transient storage pools would be stuck in an
unmanageable state if the source disappeared and libvirtd was
subsequently restarted.
- storage: Fix capacity value for LUKS encrypted volumes
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.
- qemu: Fix regression when hyperv/vendor_id feature is used
Guests using the feature would not be started at all; it is now
possible to start them as expected.
- qemu: Do not crash on USB address with no port and invalid bus
- crypto: Always pad data before encrypting it
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.
# v3.2.0 (2017-04-02)
* New features
- The virt-host-validate tool now supports bhyve hypervisor
- Introduce NVDIMM memory model
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.
- qemu: Introduce support for generic PCIe Root Ports
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.
- qemu: Add support for checking guest CPU ABI compatibility
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.
- qemu: Add support to migrate using TLS
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.
- qemu: add mediated devices framework support
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.
- qemu: Add support for setting TSC frequency
Setting TSC frequency is required to enable migration for domains with
'invtsc' CPU feature turned on.
- Add support for block device threshold event
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.
- bhyve: Add support for UEFI boot ROM, VNC, and USB tablet
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.
* Improvements
- qemu: Detect host CPU model by asking QEMU on x86_64
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.
- perf: Add more perf statistics
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.
- Write hyperv crash information into vm log
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.
* Bug fixes
- QEMU: Use adaptive timeout for connecting to monitor
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.
- Overwrite (clear) 2 KB instead of just 512 bytes when initializing
logical device
- Describe the logical backend requirements better for pool-create-as
# v3.1.0 (2017-03-03)
* New features
- storage: Add Virtuozzo storage backend storage pool
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.
- qemu: Add support for memory backing with file source
Add support in numa topology for file source inside memory backing
(hugepages are not needed) Three new elements <source/>,<access/> and
<allocation/> were added to <memoryBacking/> element. Also new
configuration parameter memory_backing_dir was added to qemu.conf.
- network: make openvswitch call timeout configurable
Adding the ability to specify the timeout value in seconds for
openvswitch calls in the libvirtd configuration file.
- bhyve: add e1000 NIC support
Add support for e1000 NIC. Previously, the only available option was
virtio-net.
- libxl: add tunneled migration support
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.
- qemu: add rendernode argument
Add a new attribute 'rendernode' to <gl> spice element.
- nodedev: add drm capability
Add a new 'drm' capability for Direct Rendering Manager (DRM) devices,
providing device type information.
- Add API for individual/specific vCPU hotplug
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.
* Improvements
- virsh: pool-list: allow both --uuid and --name in one command
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.
- Introduce MTU to domain <interface/> and <network>
Allow setting MTU size for some types of domain interface and network.
- libxl: improve support for <timer> configurations
Add support for multiple timers. Extend the tsc timer to support the
emulate mode. Improve conversion of timer XML to/from xl.cfg.
- storage: modularize the storage driver
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.
* Bug fixes
- nodedev: Fabric name must not be required for fc_host capability
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.
- bhyve: change address allocation schema for SATA disks
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 <address
type='pci'> from the <disk> elements with <target bus='sata'/> and let
libvirt regenerate it properly.
- libxl: maximum memory fixes
Fix reporting of domain maximum memory. Fix setting dom0 maximum
memory.
- libxl: fix disk detach when <driver> not specified
- libxl: fix dom0 autoballooning with Xen 4.8
- qemu: Allow empty script path to <interface/>
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.
# v3.0.0 (2017-01-17)
* New features
- Domain events for metadata content changes
The domain events framework has a new event ID that can be used to get
notifications when domain metadata content changes.
- Event notifications for the secret object
The secret object now supports event notifications, covering lifcycle
changes and secret value changes.
- New localPtr attribute for "ip" element in network XML
- qemu: Support QEMU group I/O throttling
Add the capability to allow group I/O throttling via a new domain
<disk> <iotune> subelement "group_name" to allow sharing I/O throttling
quota between multiple drives.
- nss: Introduce libvirt_guest
New libvirt_guest nss module that translates libvirt guest names into
IP addresses.
- daemon: Add support for runtime logging settings adjustment
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.
- storage: Add virStorageVolInfoFlags API
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.
- libxl: Implement virDomainGetMaxVcpus API
- storage: Add overwrite flag checking for logical pool
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).
- qemu: Add support for guest CPU configuration on s390(x)
* Improvements
- perf: Add more perf statistics
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.
- conf: Display <physical> for volume xml
Add a display of the <physical> size of a disk volume in the output of
the volume XML.
- qemu: Use virtio-pci by default for aarch64 mach-virt guests
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.
- vbox: remove support for VirtualBox 3.x and older
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.
- virsh: pool-info: introduce option --bytes
Add option --bytes to virsh pool-info in order ti allow display of
units in bytes rather than default of human readable output.
- scsi: Add parent wwnn/wwpn or fabric capability for createVport
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.
- qemu: aggregate pcie-root-ports onto multiple functions of a slot
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.
* Bug fixes
- lxc: fix accidental killing of containers during libvirtd restart
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.
- qemu: Correct GetBlockInfo values
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.
- qemu: Make virtio console usable on ppc64 guests
The chardev detection code has been improved and can now handle this
configuration properly.
- qemu: Enable mount namespace
To avoid funny races with udev relabelling devices under our hands and
to enhance security, libvirt now spawns each qemu process with its own
/dev.
- storage: Fix implementation of no-overwrite for file system backend
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.
- qemu: Create hugepage path on per domain basis
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.
- conf: Reject domains with duplicate drive addresses
Reject duplicate drive addresses for disks and hostdevs at domain
definition.
- libxl: reverse defaults on HVM net device attach
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.
- libxl: always enable pae for x86_64 HVM
By default pae is disabled in libxl. Without an explicit <pae/> setting
in the domain <features> configuration, an x86_64 HVM domain would be
get an i686 environment. pae should always be enabled for x86_64 HVM
domains.
- qemu: Fix XML dump of autogenerated websocket
As a result autogenerated websocket port is regenerated on domain
restore, migration and such as it should be.
# v2.5.0 (2016-12-04)
* New features
- shmem: Add support for additional models
The shmem device can now utilize QEMU's ivshmem-plain and
ivshmem-doorbell, more modern versions of ivshmem.
- vbox: Add VirtualBox 5.1 support
- libssh: New transport
The new libssh transport allows one to connect to a running libvirtd
via SSH, using the libssh library; for example:
qemu+libssh://server/system.
- vhost-scsi: Add support scsi_host hostdev passthrough
Add the capability to pass through a scsi_host HBA and the associated
LUNs to the guest.
- Allow debugging of gluster volumes in qemu
Users can now enable debug logging for native gluster volumes in qemu
using the "gluster_debug_level" option in qemu.conf
- Pre-allocate memory slots for memory hotplug
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
- qemu: Express devices will be placed on PCIe bus by default
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.
* Improvements
- docs: Better documentation for migration APIs and flags
- vbox: Address thread safety issues
- virsh: Add support for passing an alternative persistent XML to migrate
command
- vhostuser: Allow hotplug of multiqueue devices
- NEWS: Switch to an improved format
List user-visible changes instead of single commits for a better
high-level overview of differences between libvirt releases.
- website: Modernize layout and branding
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.
* Bug fixes
- vz: Fix migration in P2P mode
- Forbid newline character in names of some libvirt objects
- Fix compilation on macOS
==============================================================================
Older libvirt releases didn't have proper release notes: if you are interested
in changes between them, you should check out ChangeLog* and docs/news-*.html.