The QEMU Machine Protocol (QMP) is a [http://www.json.org/ JSON]-based protocol which allows applications
Features:
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= Asynchronous QMP-Shell =
...h a more modern TUI interface that is asynchronous and provides improvised features compared to the existing interfaces.
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= QMP Introspection =
...that introspection is limited to syntax and does not tell everything about QMP; developers should still read the documentation to learn semantic constrain
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=== Removed features and incompatible changes ===
...[https://qemu-project.gitlab.io/qemu/about/removed-features.html 'Removed features'] page for details of suggested replacement functionality.
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...ture introduces QEMU block layer I/O limits together with command-line and QMP interfaces for configuring limits. This allows I/O limits to be imposed ac
* [[Features/DiskIOLimits/Requirements|Requirements]]
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The first patchset that brings basic tracing features to QEMU.
http://wiki.qemu.org/Features/Tracing/Roadmap
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* The CPU is now a device. Adding CPUs via -device or HMP/QMP device_add is not supported yet.
* Various minor bugfixes; no new features in this release.
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...changes that update user-visible interface options (command line options, QMP, etc.). Use the source of this page to populate a new one for the new feat
* qmp commands
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Or, if you're using the QMP (QEMU Machine Protocol), issue this equivalent command:
...like [http://git.qemu.org/?p=qemu.git;a=blob;f=qapi-schema.json;h=8b1a423 qmp-shell] (from QEMU Git source).
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using QEMU's QMP commands. Backup software and management stack developers
* [[Features/IncrementalBackup]]
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...ally use qemu colo via qmp commands. For automatically managed colo, see [[Features/COLO/Managed HOWTO]]
# qemu-system-x86_64 -enable-kvm -cpu qemu64,+kvmclock -m 2048 -qmp stdio \
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* the <code>query-cpus-fast</code> QMP command reports bogus <code>arch</code> data for all architectures except <
== Targeted Features ==
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easy to understand and implement. The fine-grained features are marked
== QMP interface ==
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* CPU model probing was implemented through the <tt>query-cpu-model-*</tt> QMP commands
...oleted by <tt>query-cpu-model-expansion</tt> QMP commands and <tt>filtered-features</tt> property
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=== HMP/QMP/QAPI ===
* Run kvm-autotest under QMP [LuizCapitulino]
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...col-visible changes as much as possible. Provide a C library interface to QMP such that can be used to write thorough in-tree unit tests.
...tor. This spec describes the types of changes that are needed to decouple QMP from the human monitor and fix the deficiencies that are currently present.
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; QEMU User-mode Emulation User's Guide (docs/user, [[Features/Documentation/user]])
; QEMU System Emulation User's Guide (docs/system, [[Features/Documentation/system]])
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...cpu-add QMP command. More details [[Features/CPUHotplug#cpu-add_interface|Features/CPUHotplug]].
...ltered-features" to allow introspection of supported and not supported CPU features.
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=== QMP legacy interface to the QAPI ===
...onverted). You can find more details in the [http://wiki.qemu.org/QMP#TODO QMP TODO page].
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...ts/qemu-iotests/. It contains test for disk image formats and block layer features.
launch QEMU and interact with the QMP monitor (JSON), which is hard to
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=== QMP ===
* The sendkey monitor command is now available via QMP.
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...registers mean we can boot more recent Linux kernels that probe for these features
* Removed dependency on external kernel headers, all supported KVM features are now built into the binary
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* The "autoload" parameter of the "block-dirty-bitmap-add" QMP command has been removed (it's no longer needed).
=== New deprecated options and features ===
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The idea is to be able to issue a command to QEMU via the monitor or QMP, which causes QEMU to create a new snapshot image with the original image a
...QAPI/GuestAgent Guest Agent]. Please check the guest [http://wiki.qemu.org/Features/QAPI/GuestAgent Guest Agent] page for design and implementation details.
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...[https://qemu-project.gitlab.io/qemu/about/removed-features.html 'Removed features' ] page for details of suggested replacement functionality
=== New deprecated options and features ===
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* QMP command blockdev-add is still a work in progress. It doesn't support all b
* [[Features/HRandomHypercall | H_RANDOM hypercall]] device for providing good random da
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=== New deprecated options and features ===
...System Emulation User's Guide for the full list of historically deprecated features/options.
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** Tracing framework is described at [[Features/Tracing]] and in docs/tracing.txt in the source tree.
...tion/QMP|QMP]]. See also https://www.linux-kvm.org/images/1/17/2010-forum-qmp-status-talk.pp.pdf
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=== New deprecated options and features ===
...System Emulation User's Guide for the full list of historically deprecated features/options.
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=== New deprecated options and features ===
...eprecated Features"] appendix for the full list of historically deprecated features/options.
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* COLO Block Replication (Please refer to [http://wiki.qemu.org/Features/BlockReplication BlockReplication])
For automatically managed colo: [[Features/COLO/Managed HOWTO]]
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...[https://qemu-project.gitlab.io/qemu/system/removed-features.html 'Removed features' ] page for details of suggested replacement functionality
* The ''change'' QMP command has been removed. Use ''blockdev-change-medium'' or ''change-vnc-pa
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* Various bug fixes, no new features.
...U Enhanced Disk (qed) image format. It is a disk image format that forgoes features found in qcow2 in favor of better levels of performance and data integrity.
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...[https://qemu-project.gitlab.io/qemu/about/removed-features.html 'Removed features'] page for details of suggested replacement functionality.
==== Other removed features ====
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...eprecated Features"] appendix for the full list of historically deprecated features/options.
...necessary to specify "read-only=on" explicitly on the command line and in QMP commands for the setup to keep working; the default "read-only=off" setting
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...[https://qemu-project.gitlab.io/qemu/about/removed-features.html 'Removed features' ] page for details of suggested replacement functionality
=== New deprecated options and features ===
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== Write a C QMP library based on QEMU JSON and QMP code ==
...mplementing a higher level API based on this code that exposes each of the QMP functions.
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There are several features still pending:
* QEMU currently offers dirty blocks in a "push-only" mechanism via the QMP command drive-backup, which unconditionally sends all dirty blocks over the
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...nds attached to the monitor interface that are currently inaccessible over QMP (QEMU Machine Protocol). I intend to give continuity to this effort, conver
* Status: some patches have been merged into upstream, but no QMP yet. These cleanups are needed before trying to specify the protocol.
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One is Jeff Cody's multiple-device snapshot series, documented [[Features/SnapshotsMultipleDevices|here]].
...rive-mirror and blockdev-snapshot-sync can be part of a transaction. Other QMP commands are not, and will never be part of a transaction even in future ve
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=== Removed features and incompatible changes ===
...[https://qemu-project.gitlab.io/qemu/about/removed-features.html 'Removed features'] page for details of suggested replacement functionality.
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* HMP netdev_add doesn't let you reuse the ID of a deleted netdev, QMP netdev_add fails to reject duplicate ID (not a regression for 5.2 as error
== Targeted Features ==
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=== Deprecated options and features ===
...qmp command "query-cpus" is now deprecated. Use the new "query-cpus-fast" qmp command instead, which does not interrupt all running vCPUs. (However, the
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=== Removed features and incompatible changes ===
...[https://qemu-project.gitlab.io/qemu/about/removed-features.html 'Removed features'] page for details of suggested replacement functionality.
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...[https://qemu-project.gitlab.io/qemu/about/removed-features.html 'Removed features' ] page for details of suggested replacement functionality.
=== New deprecated options and features ===
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...and can be used by firmware directly. This will in the future enable new features without modifications of all firmware components (SeaBIOS, OVMF, CoreBoot)
* New command "blockdev-add" provides a QMP interface for block device hotplug.
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* QMP command blockdev-add is still a work in progress. It doesn't support all b
* Support for several new CPUID features related to AVX-512 instruction set extensions.
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=== New deprecated options and features ===
* <code>cpu-add</code> QMP/HMP command
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=== Removed features and incompatible changes ===
...[https://qemu-project.gitlab.io/qemu/about/removed-features.html 'Removed features'] page for details of suggested replacement functionality.
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* New monitor command "info memdev" (with the QMP counterpart "query-memdev").
* New QMP command "query-acpi-ospm-status" and event "ACPI_DEVICE_OST" provide inform
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...It should integrate into the existing build system. Currently, we allow features to be specified in for inclusion in a boolean fashion (either 'y' or 'n' to
...mechanism to support third party extensions to QEMU or out of tree drivers/features
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...[https://qemu-project.gitlab.io/qemu/about/removed-features.html 'Removed features' ] page for details of suggested replacement functionality
=== New deprecated options and features ===
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=== Removed features and incompatible changes ===
...[https://qemu-project.gitlab.io/qemu/about/removed-features.html 'Removed features'] page for details of suggested replacement functionality.
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.../master/system/deprecated.html#recently-removed-features "Recently removed features"] chapter of the QEMU System Emulation User's Guide.
=== New deprecated options and features ===
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...g a pflash drive. This feature is not supported when KVM is enabled. See [[Features/PC System Flash]] for more information.
* KVM guests support Hyper-V enlightenments. These are enabled by the -cpu features hv_spinlocks, hv_relaxed and hv_vapic.
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* No more modifying guest drivers to add simple storage protocol features
*** Enforce that new QMP/QAPI commands and block jobs add themselves to the matrix
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* Initial support for KVM on AArch64 systems (some features such as migration are not yet implemented)
...5420 is needed. In particular hotplug, pvpanic device and other ACPI based features now work for OVMF.
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* Support for network boot, see http://wiki.qemu-project.org/Features/S390xNetworkBoot
* blockdev-add: This QMP command is no longer experimental, together with blockdev-del. Notable chan
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=== New deprecated options and features ===
...eprecated Features"] appendix for the full list of historically deprecated features/options.
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...e. Only x3270 is supported as client. See https://wiki.qemu.org/index.php/Features/3270 for details.
...vfio-ccw (channel device passthrough). See https://wiki.qemu.org/index.php/Features/Channel_I/O_Passthrough for details.
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* QMP command blockdev-add is still a work in progress. It doesn't support all b
* new 'info hotpluggable-cpus' and corresponding 'query-hotpluggable-cpus' QMP commands<br>to list present/possible CPUs with properties necessary to add
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...For example, we should have a good page describing each of the migration features and parameters. Maybe we can have something generated from qapi/migration.
= New Features =
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* QMP command blockdev-add is still a work in progress. It doesn't support all b
* Support for the XSAVE/XSAVEOPT, MPX, FSGSBASE and PKE features
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* QMP command blockdev-add is still a work in progress. It doesn't support all b
* qmp: New MIGRATION event to communicate change in the migration state
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Future qemu is expected to support these features (some already implemented):
= Live features =
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...than q35 does (e.g. interrupt remapping). As time permits, some additional features could already be added so that q35 could be manually configured to expose t
Minimally required VT-d features for q35 are:
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- QMP: Fix asynchronous events delivery (Luiz Capitulino)
- QMP: Emit asynchronous events on all QMP monitors (Adam Litke)
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