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libvirt/docs/news.xml
Michal Privoznik 445a340bd4 news: Document sparse streams
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
2017-05-18 15:05:18 +02:00

969 lines
34 KiB
XML

<?xml version="1.0"?>
<!-- libvirt release notes
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Keep the style consistent with existing entries as much as possible.
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This file is validated against docs/news.rng schema.
Use the following template to add a new release section:
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<section title="Bug fixes">
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</release>
-->
<libvirt>
<release version="v3.4.0" date="unreleased">
<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>
</section>
<section title="Improvements">
<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>
</section>
<section title="Bug fixes">
</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>