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9b89b6a287
Giving QMP its own subdirectory in docs/ is hardly worthwhile when we have just four files, and one of them isn't even in the subdirectory. Move the files from docs/qmp/ to docs/, renaming docs/qmp/README to docs/qmp-intro. Update MAINTAINERS. The new pattern also captures the fourth file docs/writing-qmp-commands.txt. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <1443111117-29831-2-git-send-email-armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
88 lines
2.1 KiB
Plaintext
88 lines
2.1 KiB
Plaintext
QEMU Machine Protocol
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=====================
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Introduction
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------------
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The QEMU Machine Protocol (QMP) allows applications to operate a
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QEMU instance.
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QMP is JSON[1] based and features the following:
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- Lightweight, text-based, easy to parse data format
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- Asynchronous messages support (ie. events)
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- Capabilities Negotiation
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For detailed information on QMP's usage, please, refer to the following files:
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o qmp-spec.txt QEMU Machine Protocol current specification
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o qmp-commands.txt QMP supported commands (auto-generated at build-time)
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o qmp-events.txt List of available asynchronous events
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[1] http://www.json.org
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Usage
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-----
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You can use the -qmp option to enable QMP. For example, the following
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makes QMP available on localhost port 4444:
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$ qemu [...] -qmp tcp:localhost:4444,server,nowait
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However, for more flexibility and to make use of more options, the -mon
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command-line option should be used. For instance, the following example
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creates one HMP instance (human monitor) on stdio and one QMP instance
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on localhost port 4444:
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$ qemu [...] -chardev stdio,id=mon0 -mon chardev=mon0,mode=readline \
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-chardev socket,id=mon1,host=localhost,port=4444,server,nowait \
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-mon chardev=mon1,mode=control,pretty=on
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Please, refer to QEMU's manpage for more information.
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Simple Testing
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--------------
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To manually test QMP one can connect with telnet and issue commands by hand:
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$ telnet localhost 4444
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Trying 127.0.0.1...
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Connected to localhost.
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Escape character is '^]'.
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{
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"QMP": {
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"version": {
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"qemu": {
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"micro": 50,
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"minor": 6,
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"major": 1
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},
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"package": ""
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},
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"capabilities": [
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]
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}
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}
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{ "execute": "qmp_capabilities" }
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{
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"return": {
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}
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}
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{ "execute": "query-status" }
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{
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"return": {
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"status": "prelaunch",
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"singlestep": false,
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"running": false
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}
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}
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Please, refer to the qapi-schema.json file for a complete command reference.
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QMP wiki page
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-------------
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http://wiki.qemu-project.org/QMP
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