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qemu/qapi/migration.json
Markus Armbruster 5305a4eeb8 qapi: Correct documentation indentation and whitespace 
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240322140910.328840-12-armbru@redhat.com>
[Add a previous patch's stray hunk]
2024-03-26 06:36:08 +01:00

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# -*- Mode: Python -*-
# vim: filetype=python
#
##
# = Migration
##
{ 'include': 'common.json' }
{ 'include': 'sockets.json' }
##
# @MigrationStats:
#
# Detailed migration status.
#
# @transferred: amount of bytes already transferred to the target VM
#
# @remaining: amount of bytes remaining to be transferred to the
# target VM
#
# @total: total amount of bytes involved in the migration process
#
# @duplicate: number of duplicate (zero) pages (since 1.2)
#
# @skipped: number of skipped zero pages. Always zero, only provided
# for compatibility (since 1.5)
#
# @normal: number of normal pages (since 1.2)
#
# @normal-bytes: number of normal bytes sent (since 1.2)
#
# @dirty-pages-rate: number of pages dirtied by second by the guest
# (since 1.3)
#
# @mbps: throughput in megabits/sec. (since 1.6)
#
# @dirty-sync-count: number of times that dirty ram was synchronized
# (since 2.1)
#
# @postcopy-requests: The number of page requests received from the
# destination (since 2.7)
#
# @page-size: The number of bytes per page for the various page-based
# statistics (since 2.10)
#
# @multifd-bytes: The number of bytes sent through multifd (since 3.0)
#
# @pages-per-second: the number of memory pages transferred per second
# (Since 4.0)
#
# @precopy-bytes: The number of bytes sent in the pre-copy phase
# (since 7.0).
#
# @downtime-bytes: The number of bytes sent while the guest is paused
# (since 7.0).
#
# @postcopy-bytes: The number of bytes sent during the post-copy phase
# (since 7.0).
#
# @dirty-sync-missed-zero-copy: Number of times dirty RAM
# synchronization could not avoid copying dirty pages. This is
# between 0 and @dirty-sync-count * @multifd-channels. (since
# 7.1)
#
# Features:
#
# @deprecated: Member @skipped is always zero since 1.5.3
#
# Since: 0.14
##
{ 'struct': 'MigrationStats',
'data': {'transferred': 'int', 'remaining': 'int', 'total': 'int' ,
'duplicate': 'int',
'skipped': { 'type': 'int', 'features': [ 'deprecated' ] },
'normal': 'int',
'normal-bytes': 'int', 'dirty-pages-rate': 'int',
'mbps': 'number', 'dirty-sync-count': 'int',
'postcopy-requests': 'int', 'page-size': 'int',
'multifd-bytes': 'uint64', 'pages-per-second': 'uint64',
'precopy-bytes': 'uint64', 'downtime-bytes': 'uint64',
'postcopy-bytes': 'uint64',
'dirty-sync-missed-zero-copy': 'uint64' } }
##
# @XBZRLECacheStats:
#
# Detailed XBZRLE migration cache statistics
#
# @cache-size: XBZRLE cache size
#
# @bytes: amount of bytes already transferred to the target VM
#
# @pages: amount of pages transferred to the target VM
#
# @cache-miss: number of cache miss
#
# @cache-miss-rate: rate of cache miss (since 2.1)
#
# @encoding-rate: rate of encoded bytes (since 5.1)
#
# @overflow: number of overflows
#
# Since: 1.2
##
{ 'struct': 'XBZRLECacheStats',
'data': {'cache-size': 'size', 'bytes': 'int', 'pages': 'int',
'cache-miss': 'int', 'cache-miss-rate': 'number',
'encoding-rate': 'number', 'overflow': 'int' } }
##
# @CompressionStats:
#
# Detailed migration compression statistics
#
# @pages: amount of pages compressed and transferred to the target VM
#
# @busy: count of times that no free thread was available to compress
# data
#
# @busy-rate: rate of thread busy
#
# @compressed-size: amount of bytes after compression
#
# @compression-rate: rate of compressed size
#
# Since: 3.1
##
{ 'struct': 'CompressionStats',
'data': {'pages': 'int', 'busy': 'int', 'busy-rate': 'number',
'compressed-size': 'int', 'compression-rate': 'number' } }
##
# @MigrationStatus:
#
# An enumeration of migration status.
#
# @none: no migration has ever happened.
#
# @setup: migration process has been initiated.
#
# @cancelling: in the process of cancelling migration.
#
# @cancelled: cancelling migration is finished.
#
# @active: in the process of doing migration.
#
# @postcopy-active: like active, but now in postcopy mode. (since
# 2.5)
#
# @postcopy-paused: during postcopy but paused. (since 3.0)
#
# @postcopy-recover: trying to recover from a paused postcopy. (since
# 3.0)
#
# @completed: migration is finished.
#
# @failed: some error occurred during migration process.
#
# @colo: VM is in the process of fault tolerance, VM can not get into
# this state unless colo capability is enabled for migration.
# (since 2.8)
#
# @pre-switchover: Paused before device serialisation. (since 2.11)
#
# @device: During device serialisation when pause-before-switchover is
# enabled (since 2.11)
#
# @wait-unplug: wait for device unplug request by guest OS to be
# completed. (since 4.2)
#
# Since: 2.3
##
{ 'enum': 'MigrationStatus',
'data': [ 'none', 'setup', 'cancelling', 'cancelled',
'active', 'postcopy-active', 'postcopy-paused',
'postcopy-recover', 'completed', 'failed', 'colo',
'pre-switchover', 'device', 'wait-unplug' ] }
##
# @VfioStats:
#
# Detailed VFIO devices migration statistics
#
# @transferred: amount of bytes transferred to the target VM by VFIO
# devices
#
# Since: 5.2
##
{ 'struct': 'VfioStats',
'data': {'transferred': 'int' } }
##
# @MigrationInfo:
#
# Information about current migration process.
#
# @status: @MigrationStatus describing the current migration status.
# If this field is not returned, no migration process has been
# initiated
#
# @ram: @MigrationStats containing detailed migration status, only
# returned if status is 'active' or 'completed'(since 1.2)
#
# @disk: @MigrationStats containing detailed disk migration status,
# only returned if status is 'active' and it is a block migration
#
# @xbzrle-cache: @XBZRLECacheStats containing detailed XBZRLE
# migration statistics, only returned if XBZRLE feature is on and
# status is 'active' or 'completed' (since 1.2)
#
# @total-time: total amount of milliseconds since migration started.
# If migration has ended, it returns the total migration time.
# (since 1.2)
#
# @downtime: only present when migration finishes correctly total
# downtime in milliseconds for the guest. (since 1.3)
#
# @expected-downtime: only present while migration is active expected
# downtime in milliseconds for the guest in last walk of the dirty
# bitmap. (since 1.3)
#
# @setup-time: amount of setup time in milliseconds *before* the
# iterations begin but *after* the QMP command is issued. This is
# designed to provide an accounting of any activities (such as
# RDMA pinning) which may be expensive, but do not actually occur
# during the iterative migration rounds themselves. (since 1.6)
#
# @cpu-throttle-percentage: percentage of time guest cpus are being
# throttled during auto-converge. This is only present when
# auto-converge has started throttling guest cpus. (Since 2.7)
#
# @error-desc: the human readable error description string. Clients
# should not attempt to parse the error strings. (Since 2.7)
#
# @postcopy-blocktime: total time when all vCPU were blocked during
# postcopy live migration. This is only present when the
# postcopy-blocktime migration capability is enabled. (Since 3.0)
#
# @postcopy-vcpu-blocktime: list of the postcopy blocktime per vCPU.
# This is only present when the postcopy-blocktime migration
# capability is enabled. (Since 3.0)
#
# @compression: migration compression statistics, only returned if
# compression feature is on and status is 'active' or 'completed'
# (Since 3.1)
#
# @socket-address: Only used for tcp, to know what the real port is
# (Since 4.0)
#
# @vfio: @VfioStats containing detailed VFIO devices migration
# statistics, only returned if VFIO device is present, migration
# is supported by all VFIO devices and status is 'active' or
# 'completed' (since 5.2)
#
# @blocked-reasons: A list of reasons an outgoing migration is
# blocked. Present and non-empty when migration is blocked.
# (since 6.0)
#
# @dirty-limit-throttle-time-per-round: Maximum throttle time
# (in microseconds) of virtual CPUs each dirty ring full round,
# which shows how MigrationCapability dirty-limit affects the
# guest during live migration. (Since 8.1)
#
# @dirty-limit-ring-full-time: Estimated average dirty ring full time
# (in microseconds) for each dirty ring full round. The value
# equals the dirty ring memory size divided by the average dirty
# page rate of the virtual CPU, which can be used to observe the
# average memory load of the virtual CPU indirectly. Note that
# zero means guest doesn't dirty memory. (Since 8.1)
#
# Features:
#
# @deprecated: Member @disk is deprecated because block migration is.
# Member @compression is deprecated because it is unreliable and
# untested. It is recommended to use multifd migration, which
# offers an alternative compression implementation that is
# reliable and tested.
#
# Since: 0.14
##
{ 'struct': 'MigrationInfo',
'data': {'*status': 'MigrationStatus', '*ram': 'MigrationStats',
'*disk': { 'type': 'MigrationStats', 'features': [ 'deprecated' ] },
'*vfio': 'VfioStats',
'*xbzrle-cache': 'XBZRLECacheStats',
'*total-time': 'int',
'*expected-downtime': 'int',
'*downtime': 'int',
'*setup-time': 'int',
'*cpu-throttle-percentage': 'int',
'*error-desc': 'str',
'*blocked-reasons': ['str'],
'*postcopy-blocktime': 'uint32',
'*postcopy-vcpu-blocktime': ['uint32'],
'*compression': { 'type': 'CompressionStats', 'features': [ 'deprecated' ] },
'*socket-address': ['SocketAddress'],
'*dirty-limit-throttle-time-per-round': 'uint64',
'*dirty-limit-ring-full-time': 'uint64'} }
##
# @query-migrate:
#
# Returns information about current migration process. If migration
# is active there will be another json-object with RAM migration
# status and if block migration is active another one with block
# migration status.
#
# Returns: @MigrationInfo
#
# Since: 0.14
#
# Examples:
#
# 1. Before the first migration
#
# -> { "execute": "query-migrate" }
# <- { "return": {} }
#
# 2. Migration is done and has succeeded
#
# -> { "execute": "query-migrate" }
# <- { "return": {
# "status": "completed",
# "total-time":12345,
# "setup-time":12345,
# "downtime":12345,
# "ram":{
# "transferred":123,
# "remaining":123,
# "total":246,
# "duplicate":123,
# "normal":123,
# "normal-bytes":123456,
# "dirty-sync-count":15
# }
# }
# }
#
# 3. Migration is done and has failed
#
# -> { "execute": "query-migrate" }
# <- { "return": { "status": "failed" } }
#
# 4. Migration is being performed and is not a block migration:
#
# -> { "execute": "query-migrate" }
# <- {
# "return":{
# "status":"active",
# "total-time":12345,
# "setup-time":12345,
# "expected-downtime":12345,
# "ram":{
# "transferred":123,
# "remaining":123,
# "total":246,
# "duplicate":123,
# "normal":123,
# "normal-bytes":123456,
# "dirty-sync-count":15
# }
# }
# }
#
# 5. Migration is being performed and is a block migration:
#
# -> { "execute": "query-migrate" }
# <- {
# "return":{
# "status":"active",
# "total-time":12345,
# "setup-time":12345,
# "expected-downtime":12345,
# "ram":{
# "total":1057024,
# "remaining":1053304,
# "transferred":3720,
# "duplicate":123,
# "normal":123,
# "normal-bytes":123456,
# "dirty-sync-count":15
# },
# "disk":{
# "total":20971520,
# "remaining":20880384,
# "transferred":91136
# }
# }
# }
#
# 6. Migration is being performed and XBZRLE is active:
#
# -> { "execute": "query-migrate" }
# <- {
# "return":{
# "status":"active",
# "total-time":12345,
# "setup-time":12345,
# "expected-downtime":12345,
# "ram":{
# "total":1057024,
# "remaining":1053304,
# "transferred":3720,
# "duplicate":10,
# "normal":3333,
# "normal-bytes":3412992,
# "dirty-sync-count":15
# },
# "xbzrle-cache":{
# "cache-size":67108864,
# "bytes":20971520,
# "pages":2444343,
# "cache-miss":2244,
# "cache-miss-rate":0.123,
# "encoding-rate":80.1,
# "overflow":34434
# }
# }
# }
##
{ 'command': 'query-migrate', 'returns': 'MigrationInfo' }
##
# @MigrationCapability:
#
# Migration capabilities enumeration
#
# @xbzrle: Migration supports xbzrle (Xor Based Zero Run Length
# Encoding). This feature allows us to minimize migration traffic
# for certain work loads, by sending compressed difference of the
# pages
#
# @rdma-pin-all: Controls whether or not the entire VM memory
# footprint is mlock()'d on demand or all at once. Refer to
# docs/rdma.txt for usage. Disabled by default. (since 2.0)
#
# @zero-blocks: During storage migration encode blocks of zeroes
# efficiently. This essentially saves 1MB of zeroes per block on
# the wire. Enabling requires source and target VM to support
# this feature. To enable it is sufficient to enable the
# capability on the source VM. The feature is disabled by default.
# (since 1.6)
#
# @compress: Use multiple compression threads to accelerate live
# migration. This feature can help to reduce the migration
# traffic, by sending compressed pages. Please note that if
# compress and xbzrle are both on, compress only takes effect in
# the ram bulk stage, after that, it will be disabled and only
# xbzrle takes effect, this can help to minimize migration
# traffic. The feature is disabled by default. (since 2.4)
#
# @events: generate events for each migration state change (since 2.4)
#
# @auto-converge: If enabled, QEMU will automatically throttle down
# the guest to speed up convergence of RAM migration. (since 1.6)
#
# @postcopy-ram: Start executing on the migration target before all of
# RAM has been migrated, pulling the remaining pages along as
# needed. The capacity must have the same setting on both source
# and target or migration will not even start. NOTE: If the
# migration fails during postcopy the VM will fail. (since 2.6)
#
# @x-colo: If enabled, migration will never end, and the state of the
# VM on the primary side will be migrated continuously to the VM
# on secondary side, this process is called COarse-Grain LOck
# Stepping (COLO) for Non-stop Service. (since 2.8)
#
# @release-ram: if enabled, qemu will free the migrated ram pages on
# the source during postcopy-ram migration. (since 2.9)
#
# @block: If enabled, QEMU will also migrate the contents of all block
# devices. Default is disabled. A possible alternative uses
# mirror jobs to a builtin NBD server on the destination, which
# offers more flexibility. (Since 2.10)
#
# @return-path: If enabled, migration will use the return path even
# for precopy. (since 2.10)
#
# @pause-before-switchover: Pause outgoing migration before
# serialising device state and before disabling block IO (since
# 2.11)
#
# @multifd: Use more than one fd for migration (since 4.0)
#
# @dirty-bitmaps: If enabled, QEMU will migrate named dirty bitmaps.
# (since 2.12)
#
# @postcopy-blocktime: Calculate downtime for postcopy live migration
# (since 3.0)
#
# @late-block-activate: If enabled, the destination will not activate
# block devices (and thus take locks) immediately at the end of
# migration. (since 3.0)
#
# @x-ignore-shared: If enabled, QEMU will not migrate shared memory
# that is accessible on the destination machine. (since 4.0)
#
# @validate-uuid: Send the UUID of the source to allow the destination
# to ensure it is the same. (since 4.2)
#
# @background-snapshot: If enabled, the migration stream will be a
# snapshot of the VM exactly at the point when the migration
# procedure starts. The VM RAM is saved with running VM.
# (since 6.0)
#
# @zero-copy-send: Controls behavior on sending memory pages on
# migration. When true, enables a zero-copy mechanism for sending
# memory pages, if host supports it. Requires that QEMU be
# permitted to use locked memory for guest RAM pages. (since 7.1)
#
# @postcopy-preempt: If enabled, the migration process will allow
# postcopy requests to preempt precopy stream, so postcopy
# requests will be handled faster. This is a performance feature
# and should not affect the correctness of postcopy migration.
# (since 7.1)
#
# @switchover-ack: If enabled, migration will not stop the source VM
# and complete the migration until an ACK is received from the
# destination that it's OK to do so. Exactly when this ACK is
# sent depends on the migrated devices that use this feature. For
# example, a device can use it to make sure some of its data is
# sent and loaded in the destination before doing switchover.
# This can reduce downtime if devices that support this capability
# are present. 'return-path' capability must be enabled to use
# it. (since 8.1)
#
# @dirty-limit: If enabled, migration will throttle vCPUs as needed to
# keep their dirty page rate within @vcpu-dirty-limit. This can
# improve responsiveness of large guests during live migration,
# and can result in more stable read performance. Requires KVM
# with accelerator property "dirty-ring-size" set. (Since 8.1)
#
# @mapped-ram: Migrate using fixed offsets in the migration file for
# each RAM page. Requires a migration URI that supports seeking,
# such as a file. (since 9.0)
#
# Features:
#
# @deprecated: Member @block is deprecated. Use blockdev-mirror with
# NBD instead. Member @compress is deprecated because it is
# unreliable and untested. It is recommended to use multifd
# migration, which offers an alternative compression
# implementation that is reliable and tested.
#
# @unstable: Members @x-colo and @x-ignore-shared are experimental.
#
# Since: 1.2
##
{ 'enum': 'MigrationCapability',
'data': ['xbzrle', 'rdma-pin-all', 'auto-converge', 'zero-blocks',
{ 'name': 'compress', 'features': [ 'deprecated' ] },
'events', 'postcopy-ram',
{ 'name': 'x-colo', 'features': [ 'unstable' ] },
'release-ram',
{ 'name': 'block', 'features': [ 'deprecated' ] },
'return-path', 'pause-before-switchover', 'multifd',
'dirty-bitmaps', 'postcopy-blocktime', 'late-block-activate',
{ 'name': 'x-ignore-shared', 'features': [ 'unstable' ] },
'validate-uuid', 'background-snapshot',
'zero-copy-send', 'postcopy-preempt', 'switchover-ack',
'dirty-limit', 'mapped-ram'] }
##
# @MigrationCapabilityStatus:
#
# Migration capability information
#
# @capability: capability enum
#
# @state: capability state bool
#
# Since: 1.2
##
{ 'struct': 'MigrationCapabilityStatus',
'data': { 'capability': 'MigrationCapability', 'state': 'bool' } }
##
# @migrate-set-capabilities:
#
# Enable/Disable the following migration capabilities (like xbzrle)
#
# @capabilities: json array of capability modifications to make
#
# Since: 1.2
#
# Example:
#
# -> { "execute": "migrate-set-capabilities" , "arguments":
# { "capabilities": [ { "capability": "xbzrle", "state": true } ] } }
# <- { "return": {} }
##
{ 'command': 'migrate-set-capabilities',
'data': { 'capabilities': ['MigrationCapabilityStatus'] } }
##
# @query-migrate-capabilities:
#
# Returns information about the current migration capabilities status
#
# Returns: @MigrationCapabilityStatus
#
# Since: 1.2
#
# Example:
#
# -> { "execute": "query-migrate-capabilities" }
# <- { "return": [
# {"state": false, "capability": "xbzrle"},
# {"state": false, "capability": "rdma-pin-all"},
# {"state": false, "capability": "auto-converge"},
# {"state": false, "capability": "zero-blocks"},
# {"state": false, "capability": "compress"},
# {"state": true, "capability": "events"},
# {"state": false, "capability": "postcopy-ram"},
# {"state": false, "capability": "x-colo"}
# ]}
##
{ 'command': 'query-migrate-capabilities', 'returns': ['MigrationCapabilityStatus']}
##
# @MultiFDCompression:
#
# An enumeration of multifd compression methods.
#
# @none: no compression.
#
# @zlib: use zlib compression method.
#
# @zstd: use zstd compression method.
#
# Since: 5.0
##
{ 'enum': 'MultiFDCompression',
'data': [ 'none', 'zlib',
{ 'name': 'zstd', 'if': 'CONFIG_ZSTD' } ] }
##
# @MigMode:
#
# @normal: the original form of migration. (since 8.2)
#
# @cpr-reboot: The migrate command stops the VM and saves state to the
# URI. After quitting QEMU, the user resumes by running QEMU
# -incoming.
#
# This mode allows the user to quit QEMU, optionally update and
# reboot the OS, and restart QEMU. If the user reboots, the URI
# must persist across the reboot, such as by using a file.
#
# Unlike normal mode, the use of certain local storage options
# does not block the migration, but the user must not modify the
# contents of guest block devices between the quit and restart.
#
# This mode supports VFIO devices provided the user first puts the
# guest in the suspended runstate, such as by issuing
# guest-suspend-ram to the QEMU guest agent.
#
# Best performance is achieved when the memory backend is shared
# and the @x-ignore-shared migration capability is set, but this
# is not required. Further, if the user reboots before restarting
# such a configuration, the shared memory must persist across the
# reboot, such as by backing it with a dax device.
#
# @cpr-reboot may not be used with postcopy, background-snapshot,
# or COLO.
#
# (since 8.2)
##
{ 'enum': 'MigMode',
'data': [ 'normal', 'cpr-reboot' ] }
##
# @ZeroPageDetection:
#
# @none: Do not perform zero page checking.
#
# @legacy: Perform zero page checking in main migration thread.
#
# @multifd: Perform zero page checking in multifd sender thread if
# multifd migration is enabled, else in the main migration thread
# as for @legacy.
#
# Since: 9.0
##
{ 'enum': 'ZeroPageDetection',
'data': [ 'none', 'legacy', 'multifd' ] }
##
# @BitmapMigrationBitmapAliasTransform:
#
# @persistent: If present, the bitmap will be made persistent or
# transient depending on this parameter.
#
# Since: 6.0
##
{ 'struct': 'BitmapMigrationBitmapAliasTransform',
'data': {
'*persistent': 'bool'
} }
##
# @BitmapMigrationBitmapAlias:
#
# @name: The name of the bitmap.
#
# @alias: An alias name for migration (for example the bitmap name on
# the opposite site).
#
# @transform: Allows the modification of the migrated bitmap. (since
# 6.0)
#
# Since: 5.2
##
{ 'struct': 'BitmapMigrationBitmapAlias',
'data': {
'name': 'str',
'alias': 'str',
'*transform': 'BitmapMigrationBitmapAliasTransform'
} }
##
# @BitmapMigrationNodeAlias:
#
# Maps a block node name and the bitmaps it has to aliases for dirty
# bitmap migration.
#
# @node-name: A block node name.
#
# @alias: An alias block node name for migration (for example the node
# name on the opposite site).
#
# @bitmaps: Mappings for the bitmaps on this node.
#
# Since: 5.2
##
{ 'struct': 'BitmapMigrationNodeAlias',
'data': {
'node-name': 'str',
'alias': 'str',
'bitmaps': [ 'BitmapMigrationBitmapAlias' ]
} }
##
# @MigrationParameter:
#
# Migration parameters enumeration
#
# @announce-initial: Initial delay (in milliseconds) before sending
# the first announce (Since 4.0)
#
# @announce-max: Maximum delay (in milliseconds) between packets in
# the announcement (Since 4.0)
#
# @announce-rounds: Number of self-announce packets sent after
# migration (Since 4.0)
#
# @announce-step: Increase in delay (in milliseconds) between
# subsequent packets in the announcement (Since 4.0)
#
# @compress-level: Set the compression level to be used in live
# migration, the compression level is an integer between 0 and 9,
# where 0 means no compression, 1 means the best compression
# speed, and 9 means best compression ratio which will consume
# more CPU.
#
# @compress-threads: Set compression thread count to be used in live
# migration, the compression thread count is an integer between 1
# and 255.
#
# @compress-wait-thread: Controls behavior when all compression
# threads are currently busy. If true (default), wait for a free
# compression thread to become available; otherwise, send the page
# uncompressed. (Since 3.1)
#
# @decompress-threads: Set decompression thread count to be used in
# live migration, the decompression thread count is an integer
# between 1 and 255. Usually, decompression is at least 4 times as
# fast as compression, so set the decompress-threads to the number
# about 1/4 of compress-threads is adequate.
#
# @throttle-trigger-threshold: The ratio of bytes_dirty_period and
# bytes_xfer_period to trigger throttling. It is expressed as
# percentage. The default value is 50. (Since 5.0)
#
# @cpu-throttle-initial: Initial percentage of time guest cpus are
# throttled when migration auto-converge is activated. The
# default value is 20. (Since 2.7)
#
# @cpu-throttle-increment: throttle percentage increase each time
# auto-converge detects that migration is not making progress.
# The default value is 10. (Since 2.7)
#
# @cpu-throttle-tailslow: Make CPU throttling slower at tail stage At
# the tail stage of throttling, the Guest is very sensitive to CPU
# percentage while the @cpu-throttle -increment is excessive
# usually at tail stage. If this parameter is true, we will
# compute the ideal CPU percentage used by the Guest, which may
# exactly make the dirty rate match the dirty rate threshold.
# Then we will choose a smaller throttle increment between the one
# specified by @cpu-throttle-increment and the one generated by
# ideal CPU percentage. Therefore, it is compatible to
# traditional throttling, meanwhile the throttle increment won't
# be excessive at tail stage. The default value is false. (Since
# 5.1)
#
# @tls-creds: ID of the 'tls-creds' object that provides credentials
# for establishing a TLS connection over the migration data
# channel. On the outgoing side of the migration, the credentials
# must be for a 'client' endpoint, while for the incoming side the
# credentials must be for a 'server' endpoint. Setting this to a
# non-empty string enables TLS for all migrations. An empty
# string means that QEMU will use plain text mode for migration,
# rather than TLS. (Since 2.7)
#
# @tls-hostname: migration target's hostname for validating the
# server's x509 certificate identity. If empty, QEMU will use the
# hostname from the migration URI, if any. A non-empty value is
# required when using x509 based TLS credentials and the migration
# URI does not include a hostname, such as fd: or exec: based
# migration. (Since 2.7)
#
# Note: empty value works only since 2.9.
#
# @tls-authz: ID of the 'authz' object subclass that provides access
# control checking of the TLS x509 certificate distinguished name.
# This object is only resolved at time of use, so can be deleted
# and recreated on the fly while the migration server is active.
# If missing, it will default to denying access (Since 4.0)
#
# @max-bandwidth: maximum speed for migration, in bytes per second.
# (Since 2.8)
#
# @avail-switchover-bandwidth: to set the available bandwidth that
# migration can use during switchover phase. NOTE! This does not
# limit the bandwidth during switchover, but only for calculations
# when making decisions to switchover. By default, this value is
# zero, which means QEMU will estimate the bandwidth
# automatically. This can be set when the estimated value is not
# accurate, while the user is able to guarantee such bandwidth is
# available when switching over. When specified correctly, this
# can make the switchover decision much more accurate.
# (Since 8.2)
#
# @downtime-limit: set maximum tolerated downtime for migration.
# maximum downtime in milliseconds (Since 2.8)
#
# @x-checkpoint-delay: The delay time (in ms) between two COLO
# checkpoints in periodic mode. (Since 2.8)
#
# @block-incremental: Affects how much storage is migrated when the
# block migration capability is enabled. When false, the entire
# storage backing chain is migrated into a flattened image at the
# destination; when true, only the active qcow2 layer is migrated
# and the destination must already have access to the same backing
# chain as was used on the source. (since 2.10)
#
# @multifd-channels: Number of channels used to migrate data in
# parallel. This is the same number that the number of sockets
# used for migration. The default value is 2 (since 4.0)
#
# @xbzrle-cache-size: cache size to be used by XBZRLE migration. It
# needs to be a multiple of the target page size and a power of 2
# (Since 2.11)
#
# @max-postcopy-bandwidth: Background transfer bandwidth during
# postcopy. Defaults to 0 (unlimited). In bytes per second.
# (Since 3.0)
#
# @max-cpu-throttle: maximum cpu throttle percentage. Defaults to 99.
# (Since 3.1)
#
# @multifd-compression: Which compression method to use. Defaults to
# none. (Since 5.0)
#
# @multifd-zlib-level: Set the compression level to be used in live
# migration, the compression level is an integer between 0 and 9,
# where 0 means no compression, 1 means the best compression
# speed, and 9 means best compression ratio which will consume
# more CPU. Defaults to 1. (Since 5.0)
#
# @multifd-zstd-level: Set the compression level to be used in live
# migration, the compression level is an integer between 0 and 20,
# where 0 means no compression, 1 means the best compression
# speed, and 20 means best compression ratio which will consume
# more CPU. Defaults to 1. (Since 5.0)
#
# @block-bitmap-mapping: Maps block nodes and bitmaps on them to
# aliases for the purpose of dirty bitmap migration. Such aliases
# may for example be the corresponding names on the opposite site.
# The mapping must be one-to-one, but not necessarily complete: On
# the source, unmapped bitmaps and all bitmaps on unmapped nodes
# will be ignored. On the destination, encountering an unmapped
# alias in the incoming migration stream will result in a report,
# and all further bitmap migration data will then be discarded.
# Note that the destination does not know about bitmaps it does
# not receive, so there is no limitation or requirement regarding
# the number of bitmaps received, or how they are named, or on
# which nodes they are placed. By default (when this parameter
# has never been set), bitmap names are mapped to themselves.
# Nodes are mapped to their block device name if there is one, and
# to their node name otherwise. (Since 5.2)
#
# @x-vcpu-dirty-limit-period: Periodic time (in milliseconds) of dirty
# limit during live migration. Should be in the range 1 to
# 1000ms. Defaults to 1000ms. (Since 8.1)
#
# @vcpu-dirty-limit: Dirtyrate limit (MB/s) during live migration.
# Defaults to 1. (Since 8.1)
#
# @mode: Migration mode. See description in @MigMode. Default is
# 'normal'. (Since 8.2)
#
# @zero-page-detection: Whether and how to detect zero pages.
# See description in @ZeroPageDetection. Default is 'multifd'.
# (since 9.0)
#
# Features:
#
# @deprecated: Member @block-incremental is deprecated. Use
# blockdev-mirror with NBD instead. Members @compress-level,
# @compress-threads, @decompress-threads and @compress-wait-thread
# are deprecated because @compression is deprecated.
#
# @unstable: Members @x-checkpoint-delay and
# @x-vcpu-dirty-limit-period are experimental.
#
# Since: 2.4
##
{ 'enum': 'MigrationParameter',
'data': ['announce-initial', 'announce-max',
'announce-rounds', 'announce-step',
{ 'name': 'compress-level', 'features': [ 'deprecated' ] },
{ 'name': 'compress-threads', 'features': [ 'deprecated' ] },
{ 'name': 'decompress-threads', 'features': [ 'deprecated' ] },
{ 'name': 'compress-wait-thread', 'features': [ 'deprecated' ] },
'throttle-trigger-threshold',
'cpu-throttle-initial', 'cpu-throttle-increment',
'cpu-throttle-tailslow',
'tls-creds', 'tls-hostname', 'tls-authz', 'max-bandwidth',
'avail-switchover-bandwidth', 'downtime-limit',
{ 'name': 'x-checkpoint-delay', 'features': [ 'unstable' ] },
{ 'name': 'block-incremental', 'features': [ 'deprecated' ] },
'multifd-channels',
'xbzrle-cache-size', 'max-postcopy-bandwidth',
'max-cpu-throttle', 'multifd-compression',
'multifd-zlib-level', 'multifd-zstd-level',
'block-bitmap-mapping',
{ 'name': 'x-vcpu-dirty-limit-period', 'features': ['unstable'] },
'vcpu-dirty-limit',
'mode',
'zero-page-detection'] }
##
# @MigrateSetParameters:
#
# @announce-initial: Initial delay (in milliseconds) before sending
# the first announce (Since 4.0)
#
# @announce-max: Maximum delay (in milliseconds) between packets in
# the announcement (Since 4.0)
#
# @announce-rounds: Number of self-announce packets sent after
# migration (Since 4.0)
#
# @announce-step: Increase in delay (in milliseconds) between
# subsequent packets in the announcement (Since 4.0)
#
# @compress-level: Set the compression level to be used in live
# migration, the compression level is an integer between 0 and 9,
# where 0 means no compression, 1 means the best compression
# speed, and 9 means best compression ratio which will consume
# more CPU.
#
# @compress-threads: Set compression thread count to be used in live
# migration, the compression thread count is an integer between 1
# and 255.
#
# @compress-wait-thread: Controls behavior when all compression
# threads are currently busy. If true (default), wait for a free
# compression thread to become available; otherwise, send the page
# uncompressed. (Since 3.1)
#
# @decompress-threads: Set decompression thread count to be used in
# live migration, the decompression thread count is an integer
# between 1 and 255. Usually, decompression is at least 4 times as
# fast as compression, so set the decompress-threads to the number
# about 1/4 of compress-threads is adequate.
#
# @throttle-trigger-threshold: The ratio of bytes_dirty_period and
# bytes_xfer_period to trigger throttling. It is expressed as
# percentage. The default value is 50. (Since 5.0)
#
# @cpu-throttle-initial: Initial percentage of time guest cpus are
# throttled when migration auto-converge is activated. The
# default value is 20. (Since 2.7)
#
# @cpu-throttle-increment: throttle percentage increase each time
# auto-converge detects that migration is not making progress.
# The default value is 10. (Since 2.7)
#
# @cpu-throttle-tailslow: Make CPU throttling slower at tail stage At
# the tail stage of throttling, the Guest is very sensitive to CPU
# percentage while the @cpu-throttle -increment is excessive
# usually at tail stage. If this parameter is true, we will
# compute the ideal CPU percentage used by the Guest, which may
# exactly make the dirty rate match the dirty rate threshold.
# Then we will choose a smaller throttle increment between the one
# specified by @cpu-throttle-increment and the one generated by
# ideal CPU percentage. Therefore, it is compatible to
# traditional throttling, meanwhile the throttle increment won't
# be excessive at tail stage. The default value is false. (Since
# 5.1)
#
# @tls-creds: ID of the 'tls-creds' object that provides credentials
# for establishing a TLS connection over the migration data
# channel. On the outgoing side of the migration, the credentials
# must be for a 'client' endpoint, while for the incoming side the
# credentials must be for a 'server' endpoint. Setting this to a
# non-empty string enables TLS for all migrations. An empty
# string means that QEMU will use plain text mode for migration,
# rather than TLS. This is the default. (Since 2.7)
#
# @tls-hostname: migration target's hostname for validating the
# server's x509 certificate identity. If empty, QEMU will use the
# hostname from the migration URI, if any. A non-empty value is
# required when using x509 based TLS credentials and the migration
# URI does not include a hostname, such as fd: or exec: based
# migration. (Since 2.7)
#
# Note: empty value works only since 2.9.
#
# @tls-authz: ID of the 'authz' object subclass that provides access
# control checking of the TLS x509 certificate distinguished name.
# This object is only resolved at time of use, so can be deleted
# and recreated on the fly while the migration server is active.
# If missing, it will default to denying access (Since 4.0)
#
# @max-bandwidth: maximum speed for migration, in bytes per second.
# (Since 2.8)
#
# @avail-switchover-bandwidth: to set the available bandwidth that
# migration can use during switchover phase. NOTE! This does not
# limit the bandwidth during switchover, but only for calculations
# when making decisions to switchover. By default, this value is
# zero, which means QEMU will estimate the bandwidth
# automatically. This can be set when the estimated value is not
# accurate, while the user is able to guarantee such bandwidth is
# available when switching over. When specified correctly, this
# can make the switchover decision much more accurate.
# (Since 8.2)
#
# @downtime-limit: set maximum tolerated downtime for migration.
# maximum downtime in milliseconds (Since 2.8)
#
# @x-checkpoint-delay: The delay time (in ms) between two COLO
# checkpoints in periodic mode. (Since 2.8)
#
# @block-incremental: Affects how much storage is migrated when the
# block migration capability is enabled. When false, the entire
# storage backing chain is migrated into a flattened image at the
# destination; when true, only the active qcow2 layer is migrated
# and the destination must already have access to the same backing
# chain as was used on the source. (since 2.10)
#
# @multifd-channels: Number of channels used to migrate data in
# parallel. This is the same number that the number of sockets
# used for migration. The default value is 2 (since 4.0)
#
# @xbzrle-cache-size: cache size to be used by XBZRLE migration. It
# needs to be a multiple of the target page size and a power of 2
# (Since 2.11)
#
# @max-postcopy-bandwidth: Background transfer bandwidth during
# postcopy. Defaults to 0 (unlimited). In bytes per second.
# (Since 3.0)
#
# @max-cpu-throttle: maximum cpu throttle percentage. Defaults to 99.
# (Since 3.1)
#
# @multifd-compression: Which compression method to use. Defaults to
# none. (Since 5.0)
#
# @multifd-zlib-level: Set the compression level to be used in live
# migration, the compression level is an integer between 0 and 9,
# where 0 means no compression, 1 means the best compression
# speed, and 9 means best compression ratio which will consume
# more CPU. Defaults to 1. (Since 5.0)
#
# @multifd-zstd-level: Set the compression level to be used in live
# migration, the compression level is an integer between 0 and 20,
# where 0 means no compression, 1 means the best compression
# speed, and 20 means best compression ratio which will consume
# more CPU. Defaults to 1. (Since 5.0)
#
# @block-bitmap-mapping: Maps block nodes and bitmaps on them to
# aliases for the purpose of dirty bitmap migration. Such aliases
# may for example be the corresponding names on the opposite site.
# The mapping must be one-to-one, but not necessarily complete: On
# the source, unmapped bitmaps and all bitmaps on unmapped nodes
# will be ignored. On the destination, encountering an unmapped
# alias in the incoming migration stream will result in a report,
# and all further bitmap migration data will then be discarded.
# Note that the destination does not know about bitmaps it does
# not receive, so there is no limitation or requirement regarding
# the number of bitmaps received, or how they are named, or on
# which nodes they are placed. By default (when this parameter
# has never been set), bitmap names are mapped to themselves.
# Nodes are mapped to their block device name if there is one, and
# to their node name otherwise. (Since 5.2)
#
# @x-vcpu-dirty-limit-period: Periodic time (in milliseconds) of dirty
# limit during live migration. Should be in the range 1 to
# 1000ms. Defaults to 1000ms. (Since 8.1)
#
# @vcpu-dirty-limit: Dirtyrate limit (MB/s) during live migration.
# Defaults to 1. (Since 8.1)
#
# @mode: Migration mode. See description in @MigMode. Default is
# 'normal'. (Since 8.2)
#
# @zero-page-detection: Whether and how to detect zero pages.
# See description in @ZeroPageDetection. Default is 'multifd'.
# (since 9.0)
#
# Features:
#
# @deprecated: Member @block-incremental is deprecated. Use
# blockdev-mirror with NBD instead. Members @compress-level,
# @compress-threads, @decompress-threads and @compress-wait-thread
# are deprecated because @compression is deprecated.
#
# @unstable: Members @x-checkpoint-delay and
# @x-vcpu-dirty-limit-period are experimental.
#
# TODO: either fuse back into MigrationParameters, or make
# MigrationParameters members mandatory
#
# Since: 2.4
##
{ 'struct': 'MigrateSetParameters',
'data': { '*announce-initial': 'size',
'*announce-max': 'size',
'*announce-rounds': 'size',
'*announce-step': 'size',
'*compress-level': { 'type': 'uint8',
'features': [ 'deprecated' ] },
'*compress-threads': { 'type': 'uint8',
'features': [ 'deprecated' ] },
'*compress-wait-thread': { 'type': 'bool',
'features': [ 'deprecated' ] },
'*decompress-threads': { 'type': 'uint8',
'features': [ 'deprecated' ] },
'*throttle-trigger-threshold': 'uint8',
'*cpu-throttle-initial': 'uint8',
'*cpu-throttle-increment': 'uint8',
'*cpu-throttle-tailslow': 'bool',
'*tls-creds': 'StrOrNull',
'*tls-hostname': 'StrOrNull',
'*tls-authz': 'StrOrNull',
'*max-bandwidth': 'size',
'*avail-switchover-bandwidth': 'size',
'*downtime-limit': 'uint64',
'*x-checkpoint-delay': { 'type': 'uint32',
'features': [ 'unstable' ] },
'*block-incremental': { 'type': 'bool',
'features': [ 'deprecated' ] },
'*multifd-channels': 'uint8',
'*xbzrle-cache-size': 'size',
'*max-postcopy-bandwidth': 'size',
'*max-cpu-throttle': 'uint8',
'*multifd-compression': 'MultiFDCompression',
'*multifd-zlib-level': 'uint8',
'*multifd-zstd-level': 'uint8',
'*block-bitmap-mapping': [ 'BitmapMigrationNodeAlias' ],
'*x-vcpu-dirty-limit-period': { 'type': 'uint64',
'features': [ 'unstable' ] },
'*vcpu-dirty-limit': 'uint64',
'*mode': 'MigMode',
'*zero-page-detection': 'ZeroPageDetection'} }
##
# @migrate-set-parameters:
#
# Set various migration parameters.
#
# Since: 2.4
#
# Example:
#
# -> { "execute": "migrate-set-parameters" ,
# "arguments": { "multifd-channels": 5 } }
# <- { "return": {} }
##
{ 'command': 'migrate-set-parameters', 'boxed': true,
'data': 'MigrateSetParameters' }
##
# @MigrationParameters:
#
# The optional members aren't actually optional.
#
# @announce-initial: Initial delay (in milliseconds) before sending
# the first announce (Since 4.0)
#
# @announce-max: Maximum delay (in milliseconds) between packets in
# the announcement (Since 4.0)
#
# @announce-rounds: Number of self-announce packets sent after
# migration (Since 4.0)
#
# @announce-step: Increase in delay (in milliseconds) between
# subsequent packets in the announcement (Since 4.0)
#
# @compress-level: compression level
#
# @compress-threads: compression thread count
#
# @compress-wait-thread: Controls behavior when all compression
# threads are currently busy. If true (default), wait for a free
# compression thread to become available; otherwise, send the page
# uncompressed. (Since 3.1)
#
# @decompress-threads: decompression thread count
#
# @throttle-trigger-threshold: The ratio of bytes_dirty_period and
# bytes_xfer_period to trigger throttling. It is expressed as
# percentage. The default value is 50. (Since 5.0)
#
# @cpu-throttle-initial: Initial percentage of time guest cpus are
# throttled when migration auto-converge is activated. (Since
# 2.7)
#
# @cpu-throttle-increment: throttle percentage increase each time
# auto-converge detects that migration is not making progress.
# (Since 2.7)
#
# @cpu-throttle-tailslow: Make CPU throttling slower at tail stage At
# the tail stage of throttling, the Guest is very sensitive to CPU
# percentage while the @cpu-throttle -increment is excessive
# usually at tail stage. If this parameter is true, we will
# compute the ideal CPU percentage used by the Guest, which may
# exactly make the dirty rate match the dirty rate threshold.
# Then we will choose a smaller throttle increment between the one
# specified by @cpu-throttle-increment and the one generated by
# ideal CPU percentage. Therefore, it is compatible to
# traditional throttling, meanwhile the throttle increment won't
# be excessive at tail stage. The default value is false. (Since
# 5.1)
#
# @tls-creds: ID of the 'tls-creds' object that provides credentials
# for establishing a TLS connection over the migration data
# channel. On the outgoing side of the migration, the credentials
# must be for a 'client' endpoint, while for the incoming side the
# credentials must be for a 'server' endpoint. An empty string
# means that QEMU will use plain text mode for migration, rather
# than TLS. (Since 2.7)
#
# Note: 2.8 omits empty @tls-creds instead.
#
# @tls-hostname: migration target's hostname for validating the
# server's x509 certificate identity. If empty, QEMU will use the
# hostname from the migration URI, if any. (Since 2.7)
#
# Note: 2.8 omits empty @tls-hostname instead.
#
# @tls-authz: ID of the 'authz' object subclass that provides access
# control checking of the TLS x509 certificate distinguished name.
# (Since 4.0)
#
# @max-bandwidth: maximum speed for migration, in bytes per second.
# (Since 2.8)
#
# @avail-switchover-bandwidth: to set the available bandwidth that
# migration can use during switchover phase. NOTE! This does not
# limit the bandwidth during switchover, but only for calculations
# when making decisions to switchover. By default, this value is
# zero, which means QEMU will estimate the bandwidth
# automatically. This can be set when the estimated value is not
# accurate, while the user is able to guarantee such bandwidth is
# available when switching over. When specified correctly, this
# can make the switchover decision much more accurate.
# (Since 8.2)
#
# @downtime-limit: set maximum tolerated downtime for migration.
# maximum downtime in milliseconds (Since 2.8)
#
# @x-checkpoint-delay: the delay time between two COLO checkpoints.
# (Since 2.8)
#
# @block-incremental: Affects how much storage is migrated when the
# block migration capability is enabled. When false, the entire
# storage backing chain is migrated into a flattened image at the
# destination; when true, only the active qcow2 layer is migrated
# and the destination must already have access to the same backing
# chain as was used on the source. (since 2.10)
#
# @multifd-channels: Number of channels used to migrate data in
# parallel. This is the same number that the number of sockets
# used for migration. The default value is 2 (since 4.0)
#
# @xbzrle-cache-size: cache size to be used by XBZRLE migration. It
# needs to be a multiple of the target page size and a power of 2
# (Since 2.11)
#
# @max-postcopy-bandwidth: Background transfer bandwidth during
# postcopy. Defaults to 0 (unlimited). In bytes per second.
# (Since 3.0)
#
# @max-cpu-throttle: maximum cpu throttle percentage. Defaults to 99.
# (Since 3.1)
#
# @multifd-compression: Which compression method to use. Defaults to
# none. (Since 5.0)
#
# @multifd-zlib-level: Set the compression level to be used in live
# migration, the compression level is an integer between 0 and 9,
# where 0 means no compression, 1 means the best compression
# speed, and 9 means best compression ratio which will consume
# more CPU. Defaults to 1. (Since 5.0)
#
# @multifd-zstd-level: Set the compression level to be used in live
# migration, the compression level is an integer between 0 and 20,
# where 0 means no compression, 1 means the best compression
# speed, and 20 means best compression ratio which will consume
# more CPU. Defaults to 1. (Since 5.0)
#
# @block-bitmap-mapping: Maps block nodes and bitmaps on them to
# aliases for the purpose of dirty bitmap migration. Such aliases
# may for example be the corresponding names on the opposite site.
# The mapping must be one-to-one, but not necessarily complete: On
# the source, unmapped bitmaps and all bitmaps on unmapped nodes
# will be ignored. On the destination, encountering an unmapped
# alias in the incoming migration stream will result in a report,
# and all further bitmap migration data will then be discarded.
# Note that the destination does not know about bitmaps it does
# not receive, so there is no limitation or requirement regarding
# the number of bitmaps received, or how they are named, or on
# which nodes they are placed. By default (when this parameter
# has never been set), bitmap names are mapped to themselves.
# Nodes are mapped to their block device name if there is one, and
# to their node name otherwise. (Since 5.2)
#
# @x-vcpu-dirty-limit-period: Periodic time (in milliseconds) of dirty
# limit during live migration. Should be in the range 1 to
# 1000ms. Defaults to 1000ms. (Since 8.1)
#
# @vcpu-dirty-limit: Dirtyrate limit (MB/s) during live migration.
# Defaults to 1. (Since 8.1)
#
# @mode: Migration mode. See description in @MigMode. Default is
# 'normal'. (Since 8.2)
#
# @zero-page-detection: Whether and how to detect zero pages.
# See description in @ZeroPageDetection. Default is 'multifd'.
# (since 9.0)
#
# Features:
#
# @deprecated: Member @block-incremental is deprecated. Use
# blockdev-mirror with NBD instead. Members @compress-level,
# @compress-threads, @decompress-threads and @compress-wait-thread
# are deprecated because @compression is deprecated.
#
# @unstable: Members @x-checkpoint-delay and
# @x-vcpu-dirty-limit-period are experimental.
#
# Since: 2.4
##
{ 'struct': 'MigrationParameters',
'data': { '*announce-initial': 'size',
'*announce-max': 'size',
'*announce-rounds': 'size',
'*announce-step': 'size',
'*compress-level': { 'type': 'uint8',
'features': [ 'deprecated' ] },
'*compress-threads': { 'type': 'uint8',
'features': [ 'deprecated' ] },
'*compress-wait-thread': { 'type': 'bool',
'features': [ 'deprecated' ] },
'*decompress-threads': { 'type': 'uint8',
'features': [ 'deprecated' ] },
'*throttle-trigger-threshold': 'uint8',
'*cpu-throttle-initial': 'uint8',
'*cpu-throttle-increment': 'uint8',
'*cpu-throttle-tailslow': 'bool',
'*tls-creds': 'str',
'*tls-hostname': 'str',
'*tls-authz': 'str',
'*max-bandwidth': 'size',
'*avail-switchover-bandwidth': 'size',
'*downtime-limit': 'uint64',
'*x-checkpoint-delay': { 'type': 'uint32',
'features': [ 'unstable' ] },
'*block-incremental': { 'type': 'bool',
'features': [ 'deprecated' ] },
'*multifd-channels': 'uint8',
'*xbzrle-cache-size': 'size',
'*max-postcopy-bandwidth': 'size',
'*max-cpu-throttle': 'uint8',
'*multifd-compression': 'MultiFDCompression',
'*multifd-zlib-level': 'uint8',
'*multifd-zstd-level': 'uint8',
'*block-bitmap-mapping': [ 'BitmapMigrationNodeAlias' ],
'*x-vcpu-dirty-limit-period': { 'type': 'uint64',
'features': [ 'unstable' ] },
'*vcpu-dirty-limit': 'uint64',
'*mode': 'MigMode',
'*zero-page-detection': 'ZeroPageDetection'} }
##
# @query-migrate-parameters:
#
# Returns information about the current migration parameters
#
# Returns: @MigrationParameters
#
# Since: 2.4
#
# Example:
#
# -> { "execute": "query-migrate-parameters" }
# <- { "return": {
# "multifd-channels": 2,
# "cpu-throttle-increment": 10,
# "cpu-throttle-initial": 20,
# "max-bandwidth": 33554432,
# "downtime-limit": 300
# }
# }
##
{ 'command': 'query-migrate-parameters',
'returns': 'MigrationParameters' }
##
# @migrate-start-postcopy:
#
# Followup to a migration command to switch the migration to postcopy
# mode. The postcopy-ram capability must be set on both source and
# destination before the original migration command.
#
# Since: 2.5
#
# Example:
#
# -> { "execute": "migrate-start-postcopy" }
# <- { "return": {} }
##
{ 'command': 'migrate-start-postcopy' }
##
# @MIGRATION:
#
# Emitted when a migration event happens
#
# @status: @MigrationStatus describing the current migration status.
#
# Since: 2.4
#
# Example:
#
# <- {"timestamp": {"seconds": 1432121972, "microseconds": 744001},
# "event": "MIGRATION",
# "data": {"status": "completed"} }
##
{ 'event': 'MIGRATION',
'data': {'status': 'MigrationStatus'}}
##
# @MIGRATION_PASS:
#
# Emitted from the source side of a migration at the start of each
# pass (when it syncs the dirty bitmap)
#
# @pass: An incrementing count (starting at 1 on the first pass)
#
# Since: 2.6
#
# Example:
#
# <- { "timestamp": {"seconds": 1449669631, "microseconds": 239225},
# "event": "MIGRATION_PASS", "data": {"pass": 2} }
##
{ 'event': 'MIGRATION_PASS',
'data': { 'pass': 'int' } }
##
# @COLOMessage:
#
# The message transmission between Primary side and Secondary side.
#
# @checkpoint-ready: Secondary VM (SVM) is ready for checkpointing
#
# @checkpoint-request: Primary VM (PVM) tells SVM to prepare for
# checkpointing
#
# @checkpoint-reply: SVM gets PVM's checkpoint request
#
# @vmstate-send: VM's state will be sent by PVM.
#
# @vmstate-size: The total size of VMstate.
#
# @vmstate-received: VM's state has been received by SVM.
#
# @vmstate-loaded: VM's state has been loaded by SVM.
#
# Since: 2.8
##
{ 'enum': 'COLOMessage',
'data': [ 'checkpoint-ready', 'checkpoint-request', 'checkpoint-reply',
'vmstate-send', 'vmstate-size', 'vmstate-received',
'vmstate-loaded' ] }
##
# @COLOMode:
#
# The COLO current mode.
#
# @none: COLO is disabled.
#
# @primary: COLO node in primary side.
#
# @secondary: COLO node in slave side.
#
# Since: 2.8
##
{ 'enum': 'COLOMode',
'data': [ 'none', 'primary', 'secondary'] }
##
# @FailoverStatus:
#
# An enumeration of COLO failover status
#
# @none: no failover has ever happened
#
# @require: got failover requirement but not handled
#
# @active: in the process of doing failover
#
# @completed: finish the process of failover
#
# @relaunch: restart the failover process, from 'none' -> 'completed'
# (Since 2.9)
#
# Since: 2.8
##
{ 'enum': 'FailoverStatus',
'data': [ 'none', 'require', 'active', 'completed', 'relaunch' ] }
##
# @COLO_EXIT:
#
# Emitted when VM finishes COLO mode due to some errors happening or
# at the request of users.
#
# @mode: report COLO mode when COLO exited.
#
# @reason: describes the reason for the COLO exit.
#
# Since: 3.1
#
# Example:
#
# <- { "timestamp": {"seconds": 2032141960, "microseconds": 417172},
# "event": "COLO_EXIT", "data": {"mode": "primary", "reason": "request" } }
##
{ 'event': 'COLO_EXIT',
'data': {'mode': 'COLOMode', 'reason': 'COLOExitReason' } }
##
# @COLOExitReason:
#
# The reason for a COLO exit.
#
# @none: failover has never happened. This state does not occur in
# the COLO_EXIT event, and is only visible in the result of
# query-colo-status.
#
# @request: COLO exit is due to an external request.
#
# @error: COLO exit is due to an internal error.
#
# @processing: COLO is currently handling a failover (since 4.0).
#
# Since: 3.1
##
{ 'enum': 'COLOExitReason',
'data': [ 'none', 'request', 'error' , 'processing' ] }
##
# @x-colo-lost-heartbeat:
#
# Tell qemu that heartbeat is lost, request it to do takeover
# procedures. If this command is sent to the PVM, the Primary side
# will exit COLO mode. If sent to the Secondary, the Secondary side
# will run failover work, then takes over server operation to become
# the service VM.
#
# Features:
#
# @unstable: This command is experimental.
#
# Since: 2.8
#
# Example:
#
# -> { "execute": "x-colo-lost-heartbeat" }
# <- { "return": {} }
##
{ 'command': 'x-colo-lost-heartbeat',
'features': [ 'unstable' ],
'if': 'CONFIG_REPLICATION' }
##
# @migrate_cancel:
#
# Cancel the current executing migration process.
#
# Notes: This command succeeds even if there is no migration process
# running.
#
# Since: 0.14
#
# Example:
#
# -> { "execute": "migrate_cancel" }
# <- { "return": {} }
##
{ 'command': 'migrate_cancel' }
##
# @migrate-continue:
#
# Continue migration when it's in a paused state.
#
# @state: The state the migration is currently expected to be in
#
# Since: 2.11
#
# Example:
#
# -> { "execute": "migrate-continue" , "arguments":
# { "state": "pre-switchover" } }
# <- { "return": {} }
##
{ 'command': 'migrate-continue', 'data': {'state': 'MigrationStatus'} }
##
# @MigrationAddressType:
#
# The migration stream transport mechanisms.
#
# @socket: Migrate via socket.
#
# @exec: Direct the migration stream to another process.
#
# @rdma: Migrate via RDMA.
#
# @file: Direct the migration stream to a file.
#
# Since: 8.2
##
{ 'enum': 'MigrationAddressType',
'data': [ 'socket', 'exec', 'rdma', 'file' ] }
##
# @FileMigrationArgs:
#
# @filename: The file to receive the migration stream
#
# @offset: The file offset where the migration stream will start
#
# Since: 8.2
##
{ 'struct': 'FileMigrationArgs',
'data': { 'filename': 'str',
'offset': 'uint64' } }
##
# @MigrationExecCommand:
#
# @args: command (list head) and arguments to execute.
#
# Since: 8.2
##
{ 'struct': 'MigrationExecCommand',
'data': {'args': [ 'str' ] } }
##
# @MigrationAddress:
#
# Migration endpoint configuration.
#
# @transport: The migration stream transport mechanism
#
# Since: 8.2
##
{ 'union': 'MigrationAddress',
'base': { 'transport' : 'MigrationAddressType'},
'discriminator': 'transport',
'data': {
'socket': 'SocketAddress',
'exec': 'MigrationExecCommand',
'rdma': 'InetSocketAddress',
'file': 'FileMigrationArgs' } }
##
# @MigrationChannelType:
#
# The migration channel-type request options.
#
# @main: Main outbound migration channel.
#
# Since: 8.1
##
{ 'enum': 'MigrationChannelType',
'data': [ 'main' ] }
##
# @MigrationChannel:
#
# Migration stream channel parameters.
#
# @channel-type: Channel type for transferring packet information.
#
# @addr: Migration endpoint configuration on destination interface.
#
# Since: 8.1
##
{ 'struct': 'MigrationChannel',
'data': {
'channel-type': 'MigrationChannelType',
'addr': 'MigrationAddress' } }
##
# @migrate:
#
# Migrates the current running guest to another Virtual Machine.
#
# @uri: the Uniform Resource Identifier of the destination VM
#
# @channels: list of migration stream channels with each stream in the
# list connected to a destination interface endpoint.
#
# @blk: do block migration (full disk copy)
#
# @inc: incremental disk copy migration
#
# @detach: this argument exists only for compatibility reasons and is
# ignored by QEMU
#
# @resume: resume one paused migration, default "off". (since 3.0)
#
# Features:
#
# @deprecated: Members @inc and @blk are deprecated. Use
# blockdev-mirror with NBD instead.
#
# Since: 0.14
#
# Notes:
#
# 1. The 'query-migrate' command should be used to check
# migration's progress and final result (this information is
# provided by the 'status' member)
#
# 2. All boolean arguments default to false
#
# 3. The user Monitor's "detach" argument is invalid in QMP and
# should not be used
#
# 4. The uri argument should have the Uniform Resource Identifier
# of default destination VM. This connection will be bound to
# default network.
#
# 5. For now, number of migration streams is restricted to one,
# i.e. number of items in 'channels' list is just 1.
#
# 6. The 'uri' and 'channels' arguments are mutually exclusive;
# exactly one of the two should be present.
#
# Example:
#
# -> { "execute": "migrate", "arguments": { "uri": "tcp:0:4446" } }
# <- { "return": {} }
#
# -> { "execute": "migrate",
# "arguments": {
# "channels": [ { "channel-type": "main",
# "addr": { "transport": "socket",
# "type": "inet",
# "host": "10.12.34.9",
# "port": "1050" } } ] } }
# <- { "return": {} }
#
# -> { "execute": "migrate",
# "arguments": {
# "channels": [ { "channel-type": "main",
# "addr": { "transport": "exec",
# "args": [ "/bin/nc", "-p", "6000",
# "/some/sock" ] } } ] } }
# <- { "return": {} }
#
# -> { "execute": "migrate",
# "arguments": {
# "channels": [ { "channel-type": "main",
# "addr": { "transport": "rdma",
# "host": "10.12.34.9",
# "port": "1050" } } ] } }
# <- { "return": {} }
#
# -> { "execute": "migrate",
# "arguments": {
# "channels": [ { "channel-type": "main",
# "addr": { "transport": "file",
# "filename": "/tmp/migfile",
# "offset": "0x1000" } } ] } }
# <- { "return": {} }
#
##
{ 'command': 'migrate',
'data': {'*uri': 'str',
'*channels': [ 'MigrationChannel' ],
'*blk': { 'type': 'bool', 'features': [ 'deprecated' ] },
'*inc': { 'type': 'bool', 'features': [ 'deprecated' ] },
'*detach': 'bool', '*resume': 'bool' } }
##
# @migrate-incoming:
#
# Start an incoming migration, the qemu must have been started with
# -incoming defer
#
# @uri: The Uniform Resource Identifier identifying the source or
# address to listen on
#
# @channels: list of migration stream channels with each stream in the
# list connected to a destination interface endpoint.
#
# Since: 2.3
#
# Notes:
#
# 1. It's a bad idea to use a string for the uri, but it needs to
# stay compatible with -incoming and the format of the uri is
# already exposed above libvirt.
#
# 2. QEMU must be started with -incoming defer to allow
# migrate-incoming to be used.
#
# 3. The uri format is the same as for -incoming
#
# 4. For now, number of migration streams is restricted to one,
# i.e. number of items in 'channels' list is just 1.
#
# 5. The 'uri' and 'channels' arguments are mutually exclusive;
# exactly one of the two should be present.
#
# Example:
#
# -> { "execute": "migrate-incoming",
# "arguments": { "uri": "tcp:0:4446" } }
# <- { "return": {} }
#
# -> { "execute": "migrate-incoming",
# "arguments": {
# "channels": [ { "channel-type": "main",
# "addr": { "transport": "socket",
# "type": "inet",
# "host": "10.12.34.9",
# "port": "1050" } } ] } }
# <- { "return": {} }
#
# -> { "execute": "migrate-incoming",
# "arguments": {
# "channels": [ { "channel-type": "main",
# "addr": { "transport": "exec",
# "args": [ "/bin/nc", "-p", "6000",
# "/some/sock" ] } } ] } }
# <- { "return": {} }
#
# -> { "execute": "migrate-incoming",
# "arguments": {
# "channels": [ { "channel-type": "main",
# "addr": { "transport": "rdma",
# "host": "10.12.34.9",
# "port": "1050" } } ] } }
# <- { "return": {} }
##
{ 'command': 'migrate-incoming',
'data': {'*uri': 'str',
'*channels': [ 'MigrationChannel' ] } }
##
# @xen-save-devices-state:
#
# Save the state of all devices to file. The RAM and the block
# devices of the VM are not saved by this command.
#
# @filename: the file to save the state of the devices to as binary
# data. See xen-save-devices-state.txt for a description of the
# binary format.
#
# @live: Optional argument to ask QEMU to treat this command as part
# of a live migration. Default to true. (since 2.11)
#
# Since: 1.1
#
# Example:
#
# -> { "execute": "xen-save-devices-state",
# "arguments": { "filename": "/tmp/save" } }
# <- { "return": {} }
##
{ 'command': 'xen-save-devices-state',
'data': {'filename': 'str', '*live':'bool' } }
##
# @xen-set-global-dirty-log:
#
# Enable or disable the global dirty log mode.
#
# @enable: true to enable, false to disable.
#
# Since: 1.3
#
# Example:
#
# -> { "execute": "xen-set-global-dirty-log",
# "arguments": { "enable": true } }
# <- { "return": {} }
##
{ 'command': 'xen-set-global-dirty-log', 'data': { 'enable': 'bool' } }
##
# @xen-load-devices-state:
#
# Load the state of all devices from file. The RAM and the block
# devices of the VM are not loaded by this command.
#
# @filename: the file to load the state of the devices from as binary
# data. See xen-save-devices-state.txt for a description of the
# binary format.
#
# Since: 2.7
#
# Example:
#
# -> { "execute": "xen-load-devices-state",
# "arguments": { "filename": "/tmp/resume" } }
# <- { "return": {} }
##
{ 'command': 'xen-load-devices-state', 'data': {'filename': 'str'} }
##
# @xen-set-replication:
#
# Enable or disable replication.
#
# @enable: true to enable, false to disable.
#
# @primary: true for primary or false for secondary.
#
# @failover: true to do failover, false to stop. Cannot be specified
# if 'enable' is true. Default value is false.
#
# Example:
#
# -> { "execute": "xen-set-replication",
# "arguments": {"enable": true, "primary": false} }
# <- { "return": {} }
#
# Since: 2.9
##
{ 'command': 'xen-set-replication',
'data': { 'enable': 'bool', 'primary': 'bool', '*failover': 'bool' },
'if': 'CONFIG_REPLICATION' }
##
# @ReplicationStatus:
#
# The result format for 'query-xen-replication-status'.
#
# @error: true if an error happened, false if replication is normal.
#
# @desc: the human readable error description string, when @error is
# 'true'.
#
# Since: 2.9
##
{ 'struct': 'ReplicationStatus',
'data': { 'error': 'bool', '*desc': 'str' },
'if': 'CONFIG_REPLICATION' }
##
# @query-xen-replication-status:
#
# Query replication status while the vm is running.
#
# Returns: A @ReplicationStatus object showing the status.
#
# Example:
#
# -> { "execute": "query-xen-replication-status" }
# <- { "return": { "error": false } }
#
# Since: 2.9
##
{ 'command': 'query-xen-replication-status',
'returns': 'ReplicationStatus',
'if': 'CONFIG_REPLICATION' }
##
# @xen-colo-do-checkpoint:
#
# Xen uses this command to notify replication to trigger a checkpoint.
#
# Example:
#
# -> { "execute": "xen-colo-do-checkpoint" }
# <- { "return": {} }
#
# Since: 2.9
##
{ 'command': 'xen-colo-do-checkpoint',
'if': 'CONFIG_REPLICATION' }
##
# @COLOStatus:
#
# The result format for 'query-colo-status'.
#
# @mode: COLO running mode. If COLO is running, this field will
# return 'primary' or 'secondary'.
#
# @last-mode: COLO last running mode. If COLO is running, this field
# will return same like mode field, after failover we can use this
# field to get last colo mode. (since 4.0)
#
# @reason: describes the reason for the COLO exit.
#
# Since: 3.1
##
{ 'struct': 'COLOStatus',
'data': { 'mode': 'COLOMode', 'last-mode': 'COLOMode',
'reason': 'COLOExitReason' },
'if': 'CONFIG_REPLICATION' }
##
# @query-colo-status:
#
# Query COLO status while the vm is running.
#
# Returns: A @COLOStatus object showing the status.
#
# Example:
#
# -> { "execute": "query-colo-status" }
# <- { "return": { "mode": "primary", "last-mode": "none", "reason": "request" } }
#
# Since: 3.1
##
{ 'command': 'query-colo-status',
'returns': 'COLOStatus',
'if': 'CONFIG_REPLICATION' }
##
# @migrate-recover:
#
# Provide a recovery migration stream URI.
#
# @uri: the URI to be used for the recovery of migration stream.
#
# Example:
#
# -> { "execute": "migrate-recover",
# "arguments": { "uri": "tcp:192.168.1.200:12345" } }
# <- { "return": {} }
#
# Since: 3.0
##
{ 'command': 'migrate-recover',
'data': { 'uri': 'str' },
'allow-oob': true }
##
# @migrate-pause:
#
# Pause a migration. Currently it only supports postcopy.
#
# Example:
#
# -> { "execute": "migrate-pause" }
# <- { "return": {} }
#
# Since: 3.0
##
{ 'command': 'migrate-pause', 'allow-oob': true }
##
# @UNPLUG_PRIMARY:
#
# Emitted from source side of a migration when migration state is
# WAIT_UNPLUG. Device was unplugged by guest operating system. Device
# resources in QEMU are kept on standby to be able to re-plug it in
# case of migration failure.
#
# @device-id: QEMU device id of the unplugged device
#
# Since: 4.2
#
# Example:
#
# <- { "event": "UNPLUG_PRIMARY",
# "data": { "device-id": "hostdev0" },
# "timestamp": { "seconds": 1265044230, "microseconds": 450486 } }
##
{ 'event': 'UNPLUG_PRIMARY',
'data': { 'device-id': 'str' } }
##
# @DirtyRateVcpu:
#
# Dirty rate of vcpu.
#
# @id: vcpu index.
#
# @dirty-rate: dirty rate.
#
# Since: 6.2
##
{ 'struct': 'DirtyRateVcpu',
'data': { 'id': 'int', 'dirty-rate': 'int64' } }
##
# @DirtyRateStatus:
#
# Dirty page rate measurement status.
#
# @unstarted: measuring thread has not been started yet
#
# @measuring: measuring thread is running
#
# @measured: dirty page rate is measured and the results are available
#
# Since: 5.2
##
{ 'enum': 'DirtyRateStatus',
'data': [ 'unstarted', 'measuring', 'measured'] }
##
# @DirtyRateMeasureMode:
#
# Method used to measure dirty page rate. Differences between
# available methods are explained in @calc-dirty-rate.
#
# @page-sampling: use page sampling
#
# @dirty-ring: use dirty ring
#
# @dirty-bitmap: use dirty bitmap
#
# Since: 6.2
##
{ 'enum': 'DirtyRateMeasureMode',
'data': ['page-sampling', 'dirty-ring', 'dirty-bitmap'] }
##
# @TimeUnit:
#
# Specifies unit in which time-related value is specified.
#
# @second: value is in seconds
#
# @millisecond: value is in milliseconds
#
# Since: 8.2
##
{ 'enum': 'TimeUnit',
'data': ['second', 'millisecond'] }
##
# @DirtyRateInfo:
#
# Information about measured dirty page rate.
#
# @dirty-rate: an estimate of the dirty page rate of the VM in units
# of MiB/s. Value is present only when @status is 'measured'.
#
# @status: current status of dirty page rate measurements
#
# @start-time: start time in units of second for calculation
#
# @calc-time: time period for which dirty page rate was measured,
# expressed and rounded down to @calc-time-unit.
#
# @calc-time-unit: time unit of @calc-time (Since 8.2)
#
# @sample-pages: number of sampled pages per GiB of guest memory.
# Valid only in page-sampling mode (Since 6.1)
#
# @mode: mode that was used to measure dirty page rate (Since 6.2)
#
# @vcpu-dirty-rate: dirty rate for each vCPU if dirty-ring mode was
# specified (Since 6.2)
#
# Since: 5.2
##
{ 'struct': 'DirtyRateInfo',
'data': {'*dirty-rate': 'int64',
'status': 'DirtyRateStatus',
'start-time': 'int64',
'calc-time': 'int64',
'calc-time-unit': 'TimeUnit',
'sample-pages': 'uint64',
'mode': 'DirtyRateMeasureMode',
'*vcpu-dirty-rate': [ 'DirtyRateVcpu' ] } }
##
# @calc-dirty-rate:
#
# Start measuring dirty page rate of the VM. Results can be retrieved
# with @query-dirty-rate after measurements are completed.
#
# Dirty page rate is the number of pages changed in a given time
# period expressed in MiB/s. The following methods of calculation are
# available:
#
# 1. In page sampling mode, a random subset of pages are selected and
# hashed twice: once at the beginning of measurement time period,
# and once again at the end. If two hashes for some page are
# different, the page is counted as changed. Since this method
# relies on sampling and hashing, calculated dirty page rate is
# only an estimate of its true value. Increasing @sample-pages
# improves estimation quality at the cost of higher computational
# overhead.
#
# 2. Dirty bitmap mode captures writes to memory (for example by
# temporarily revoking write access to all pages) and counting page
# faults. Information about modified pages is collected into a
# bitmap, where each bit corresponds to one guest page. This mode
# requires that KVM accelerator property "dirty-ring-size" is *not*
# set.
#
# 3. Dirty ring mode is similar to dirty bitmap mode, but the
# information about modified pages is collected into ring buffer.
# This mode tracks page modification per each vCPU separately. It
# requires that KVM accelerator property "dirty-ring-size" is set.
#
# @calc-time: time period for which dirty page rate is calculated.
# By default it is specified in seconds, but the unit can be set
# explicitly with @calc-time-unit. Note that larger @calc-time
# values will typically result in smaller dirty page rates because
# page dirtying is a one-time event. Once some page is counted
# as dirty during @calc-time period, further writes to this page
# will not increase dirty page rate anymore.
#
# @calc-time-unit: time unit in which @calc-time is specified.
# By default it is seconds. (Since 8.2)
#
# @sample-pages: number of sampled pages per each GiB of guest memory.
# Default value is 512. For 4KiB guest pages this corresponds to
# sampling ratio of 0.2%. This argument is used only in page
# sampling mode. (Since 6.1)
#
# @mode: mechanism for tracking dirty pages. Default value is
# 'page-sampling'. Others are 'dirty-bitmap' and 'dirty-ring'.
# (Since 6.1)
#
# Since: 5.2
#
# Example:
#
# -> {"execute": "calc-dirty-rate", "arguments": {"calc-time": 1,
# 'sample-pages': 512} }
# <- { "return": {} }
#
# Measure dirty rate using dirty bitmap for 500 milliseconds:
#
# -> {"execute": "calc-dirty-rate", "arguments": {"calc-time": 500,
# "calc-time-unit": "millisecond", "mode": "dirty-bitmap"} }
#
# <- { "return": {} }
##
{ 'command': 'calc-dirty-rate', 'data': {'calc-time': 'int64',
'*calc-time-unit': 'TimeUnit',
'*sample-pages': 'int',
'*mode': 'DirtyRateMeasureMode'} }
##
# @query-dirty-rate:
#
# Query results of the most recent invocation of @calc-dirty-rate.
#
# @calc-time-unit: time unit in which to report calculation time.
# By default it is reported in seconds. (Since 8.2)
#
# Since: 5.2
#
# Examples:
#
# 1. Measurement is in progress:
#
# <- {"status": "measuring", "sample-pages": 512,
# "mode": "page-sampling", "start-time": 1693900454, "calc-time": 10,
# "calc-time-unit": "second"}
#
# 2. Measurement has been completed:
#
# <- {"status": "measured", "sample-pages": 512, "dirty-rate": 108,
# "mode": "page-sampling", "start-time": 1693900454, "calc-time": 10,
# "calc-time-unit": "second"}
##
{ 'command': 'query-dirty-rate', 'data': {'*calc-time-unit': 'TimeUnit' },
'returns': 'DirtyRateInfo' }
##
# @DirtyLimitInfo:
#
# Dirty page rate limit information of a virtual CPU.
#
# @cpu-index: index of a virtual CPU.
#
# @limit-rate: upper limit of dirty page rate (MB/s) for a virtual
# CPU, 0 means unlimited.
#
# @current-rate: current dirty page rate (MB/s) for a virtual CPU.
#
# Since: 7.1
##
{ 'struct': 'DirtyLimitInfo',
'data': { 'cpu-index': 'int',
'limit-rate': 'uint64',
'current-rate': 'uint64' } }
##
# @set-vcpu-dirty-limit:
#
# Set the upper limit of dirty page rate for virtual CPUs.
#
# Requires KVM with accelerator property "dirty-ring-size" set. A
# virtual CPU's dirty page rate is a measure of its memory load. To
# observe dirty page rates, use @calc-dirty-rate.
#
# @cpu-index: index of a virtual CPU, default is all.
#
# @dirty-rate: upper limit of dirty page rate (MB/s) for virtual CPUs.
#
# Since: 7.1
#
# Example:
#
# -> {"execute": "set-vcpu-dirty-limit"}
# "arguments": { "dirty-rate": 200,
# "cpu-index": 1 } }
# <- { "return": {} }
##
{ 'command': 'set-vcpu-dirty-limit',
'data': { '*cpu-index': 'int',
'dirty-rate': 'uint64' } }
##
# @cancel-vcpu-dirty-limit:
#
# Cancel the upper limit of dirty page rate for virtual CPUs.
#
# Cancel the dirty page limit for the vCPU which has been set with
# set-vcpu-dirty-limit command. Note that this command requires
# support from dirty ring, same as the "set-vcpu-dirty-limit".
#
# @cpu-index: index of a virtual CPU, default is all.
#
# Since: 7.1
#
# Example:
#
# -> {"execute": "cancel-vcpu-dirty-limit"},
# "arguments": { "cpu-index": 1 } }
# <- { "return": {} }
##
{ 'command': 'cancel-vcpu-dirty-limit',
'data': { '*cpu-index': 'int'} }
##
# @query-vcpu-dirty-limit:
#
# Returns information about virtual CPU dirty page rate limits, if
# any.
#
# Since: 7.1
#
# Example:
#
# -> {"execute": "query-vcpu-dirty-limit"}
# <- {"return": [
# { "limit-rate": 60, "current-rate": 3, "cpu-index": 0},
# { "limit-rate": 60, "current-rate": 3, "cpu-index": 1}]}
##
{ 'command': 'query-vcpu-dirty-limit',
'returns': [ 'DirtyLimitInfo' ] }
##
# @MigrationThreadInfo:
#
# Information about migrationthreads
#
# @name: the name of migration thread
#
# @thread-id: ID of the underlying host thread
#
# Since: 7.2
##
{ 'struct': 'MigrationThreadInfo',
'data': {'name': 'str',
'thread-id': 'int'} }
##
# @query-migrationthreads:
#
# Returns information of migration threads
#
# Returns: @MigrationThreadInfo
#
# Since: 7.2
##
{ 'command': 'query-migrationthreads',
'returns': ['MigrationThreadInfo'] }
##
# @snapshot-save:
#
# Save a VM snapshot
#
# @job-id: identifier for the newly created job
#
# @tag: name of the snapshot to create
#
# @vmstate: block device node name to save vmstate to
#
# @devices: list of block device node names to save a snapshot to
#
# Applications should not assume that the snapshot save is complete
# when this command returns. The job commands / events must be used
# to determine completion and to fetch details of any errors that
# arise.
#
# Note that execution of the guest CPUs may be stopped during the time
# it takes to save the snapshot. A future version of QEMU may ensure
# CPUs are executing continuously.
#
# It is strongly recommended that @devices contain all writable block
# device nodes if a consistent snapshot is required.
#
# If @tag already exists, an error will be reported
#
# Example:
#
# -> { "execute": "snapshot-save",
# "arguments": {
# "job-id": "snapsave0",
# "tag": "my-snap",
# "vmstate": "disk0",
# "devices": ["disk0", "disk1"]
# }
# }
# <- { "return": { } }
# <- {"event": "JOB_STATUS_CHANGE",
# "timestamp": {"seconds": 1432121972, "microseconds": 744001},
# "data": {"status": "created", "id": "snapsave0"}}
# <- {"event": "JOB_STATUS_CHANGE",
# "timestamp": {"seconds": 1432122172, "microseconds": 744001},
# "data": {"status": "running", "id": "snapsave0"}}
# <- {"event": "STOP",
# "timestamp": {"seconds": 1432122372, "microseconds": 744001} }
# <- {"event": "RESUME",
# "timestamp": {"seconds": 1432122572, "microseconds": 744001} }
# <- {"event": "JOB_STATUS_CHANGE",
# "timestamp": {"seconds": 1432122772, "microseconds": 744001},
# "data": {"status": "waiting", "id": "snapsave0"}}
# <- {"event": "JOB_STATUS_CHANGE",
# "timestamp": {"seconds": 1432122972, "microseconds": 744001},
# "data": {"status": "pending", "id": "snapsave0"}}
# <- {"event": "JOB_STATUS_CHANGE",
# "timestamp": {"seconds": 1432123172, "microseconds": 744001},
# "data": {"status": "concluded", "id": "snapsave0"}}
# -> {"execute": "query-jobs"}
# <- {"return": [{"current-progress": 1,
# "status": "concluded",
# "total-progress": 1,
# "type": "snapshot-save",
# "id": "snapsave0"}]}
#
# Since: 6.0
##
{ 'command': 'snapshot-save',
'data': { 'job-id': 'str',
'tag': 'str',
'vmstate': 'str',
'devices': ['str'] } }
##
# @snapshot-load:
#
# Load a VM snapshot
#
# @job-id: identifier for the newly created job
#
# @tag: name of the snapshot to load.
#
# @vmstate: block device node name to load vmstate from
#
# @devices: list of block device node names to load a snapshot from
#
# Applications should not assume that the snapshot load is complete
# when this command returns. The job commands / events must be used
# to determine completion and to fetch details of any errors that
# arise.
#
# Note that execution of the guest CPUs will be stopped during the
# time it takes to load the snapshot.
#
# It is strongly recommended that @devices contain all writable block
# device nodes that can have changed since the original @snapshot-save
# command execution.
#
# Example:
#
# -> { "execute": "snapshot-load",
# "arguments": {
# "job-id": "snapload0",
# "tag": "my-snap",
# "vmstate": "disk0",
# "devices": ["disk0", "disk1"]
# }
# }
# <- { "return": { } }
# <- {"event": "JOB_STATUS_CHANGE",
# "timestamp": {"seconds": 1472124172, "microseconds": 744001},
# "data": {"status": "created", "id": "snapload0"}}
# <- {"event": "JOB_STATUS_CHANGE",
# "timestamp": {"seconds": 1472125172, "microseconds": 744001},
# "data": {"status": "running", "id": "snapload0"}}
# <- {"event": "STOP",
# "timestamp": {"seconds": 1472125472, "microseconds": 744001} }
# <- {"event": "RESUME",
# "timestamp": {"seconds": 1472125872, "microseconds": 744001} }
# <- {"event": "JOB_STATUS_CHANGE",
# "timestamp": {"seconds": 1472126172, "microseconds": 744001},
# "data": {"status": "waiting", "id": "snapload0"}}
# <- {"event": "JOB_STATUS_CHANGE",
# "timestamp": {"seconds": 1472127172, "microseconds": 744001},
# "data": {"status": "pending", "id": "snapload0"}}
# <- {"event": "JOB_STATUS_CHANGE",
# "timestamp": {"seconds": 1472128172, "microseconds": 744001},
# "data": {"status": "concluded", "id": "snapload0"}}
# -> {"execute": "query-jobs"}
# <- {"return": [{"current-progress": 1,
# "status": "concluded",
# "total-progress": 1,
# "type": "snapshot-load",
# "id": "snapload0"}]}
#
# Since: 6.0
##
{ 'command': 'snapshot-load',
'data': { 'job-id': 'str',
'tag': 'str',
'vmstate': 'str',
'devices': ['str'] } }
##
# @snapshot-delete:
#
# Delete a VM snapshot
#
# @job-id: identifier for the newly created job
#
# @tag: name of the snapshot to delete.
#
# @devices: list of block device node names to delete a snapshot from
#
# Applications should not assume that the snapshot delete is complete
# when this command returns. The job commands / events must be used
# to determine completion and to fetch details of any errors that
# arise.
#
# Example:
#
# -> { "execute": "snapshot-delete",
# "arguments": {
# "job-id": "snapdelete0",
# "tag": "my-snap",
# "devices": ["disk0", "disk1"]
# }
# }
# <- { "return": { } }
# <- {"event": "JOB_STATUS_CHANGE",
# "timestamp": {"seconds": 1442124172, "microseconds": 744001},
# "data": {"status": "created", "id": "snapdelete0"}}
# <- {"event": "JOB_STATUS_CHANGE",
# "timestamp": {"seconds": 1442125172, "microseconds": 744001},
# "data": {"status": "running", "id": "snapdelete0"}}
# <- {"event": "JOB_STATUS_CHANGE",
# "timestamp": {"seconds": 1442126172, "microseconds": 744001},
# "data": {"status": "waiting", "id": "snapdelete0"}}
# <- {"event": "JOB_STATUS_CHANGE",
# "timestamp": {"seconds": 1442127172, "microseconds": 744001},
# "data": {"status": "pending", "id": "snapdelete0"}}
# <- {"event": "JOB_STATUS_CHANGE",
# "timestamp": {"seconds": 1442128172, "microseconds": 744001},
# "data": {"status": "concluded", "id": "snapdelete0"}}
# -> {"execute": "query-jobs"}
# <- {"return": [{"current-progress": 1,
# "status": "concluded",
# "total-progress": 1,
# "type": "snapshot-delete",
# "id": "snapdelete0"}]}
#
# Since: 6.0
##
{ 'command': 'snapshot-delete',
'data': { 'job-id': 'str',
'tag': 'str',
'devices': ['str'] } }
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