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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* 4 qmp/hmp for related information retrieving.
* New features are implemented by KVM and we may want to add them to existing models (e.g.
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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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