qapi/dump.json

# -*- Mode: Python -*-
#
# This work is licensed under the terms of the GNU GPL, version 2 or later.
# See the COPYING file in the top-level directory.

##
# = Dump guest memory
##

##
# @DumpGuestMemoryFormat:
#
# An enumeration of guest-memory-dump's format.
#
# @elf: elf format
#
# @kdump-zlib: kdump-compressed format with zlib-compressed
#
# @kdump-lzo: kdump-compressed format with lzo-compressed
#
# @kdump-snappy: kdump-compressed format with snappy-compressed
#
# @win-dmp: Windows full crashdump format,
#           can be used instead of ELF converting (since 2.13)
#
# Since: 2.0
##
{ 'enum': 'DumpGuestMemoryFormat',
  'data': [ 'elf', 'kdump-zlib', 'kdump-lzo', 'kdump-snappy', 'win-dmp' ] }

##
# @dump-guest-memory:
#
# Dump guest's memory to vmcore. It is a synchronous operation that can take
# very long depending on the amount of guest memory.
#
# @paging: if true, do paging to get guest's memory mapping. This allows
#          using gdb to process the core file.
#
#          IMPORTANT: this option can make QEMU allocate several gigabytes
#          of RAM. This can happen for a large guest, or a
#          malicious guest pretending to be large.
#
#          Also, paging=true has the following limitations:
#
#             1. The guest may be in a catastrophic state or can have corrupted
#                memory, which cannot be trusted
#             2. The guest can be in real-mode even if paging is enabled. For
#                example, the guest uses ACPI to sleep, and ACPI sleep state
#                goes in real-mode
#             3. Currently only supported on i386 and x86_64.
#
# @protocol: the filename or file descriptor of the vmcore. The supported
#            protocols are:
#
#            1. file: the protocol starts with "file:", and the following
#               string is the file's path.
#            2. fd: the protocol starts with "fd:", and the following string
#               is the fd's name.
#
# @detach: if true, QMP will return immediately rather than
#          waiting for the dump to finish. The user can track progress
#          using "query-dump". (since 2.6).
#
# @begin: if specified, the starting physical address.
#
# @length: if specified, the memory size, in bytes. If you don't
#          want to dump all guest's memory, please specify the start @begin
#          and @length
#
# @format: if specified, the format of guest memory dump. But non-elf
#          format is conflict with paging and filter, ie. @paging, @begin and
#          @length is not allowed to be specified with non-elf @format at the
#          same time (since 2.0)
#
# Note: All boolean arguments default to false
#
# Returns: nothing on success
#
# Since: 1.2
#
# Example:
#
# -> { "execute": "dump-guest-memory",
#      "arguments": { "protocol": "fd:dump" } }
# <- { "return": {} }
#
##
{ 'command': 'dump-guest-memory',
  'data': { 'paging': 'bool', 'protocol': 'str', '*detach': 'bool',
            '*begin': 'int', '*length': 'int',
            '*format': 'DumpGuestMemoryFormat'} }

##
# @DumpStatus:
#
# Describe the status of a long-running background guest memory dump.
#
# @none: no dump-guest-memory has started yet.
#
# @active: there is one dump running in background.
#
# @completed: the last dump has finished successfully.
#
# @failed: the last dump has failed.
#
# Since: 2.6
##
{ 'enum': 'DumpStatus',
  'data': [ 'none', 'active', 'completed', 'failed' ] }

##
# @DumpQueryResult:
#
# The result format for 'query-dump'.
#
# @status: enum of @DumpStatus, which shows current dump status
#
# @completed: bytes written in latest dump (uncompressed)
#
# @total: total bytes to be written in latest dump (uncompressed)
#
# Since: 2.6
##
{ 'struct': 'DumpQueryResult',
  'data': { 'status': 'DumpStatus',
            'completed': 'int',
            'total': 'int' } }

##
# @query-dump:
#
# Query latest dump status.
#
# Returns: A @DumpStatus object showing the dump status.
#
# Since: 2.6
#
# Example:
#
# -> { "execute": "query-dump" }
# <- { "return": { "status": "active", "completed": 1024000,
#                  "total": 2048000 } }
#
##
{ 'command': 'query-dump', 'returns': 'DumpQueryResult' }

##
# @DUMP_COMPLETED:
#
# Emitted when background dump has completed
#
# @result: final dump status
#
# @error: human-readable error string that provides
#         hint on why dump failed. Only presents on failure. The
#         user should not try to interpret the error string.
#
# Since: 2.6
#
# Example:
#
# { "event": "DUMP_COMPLETED",
#   "data": {"result": {"total": 1090650112, "status": "completed",
#                       "completed": 1090650112} } }
#
##
{ 'event': 'DUMP_COMPLETED' ,
  'data': { 'result': 'DumpQueryResult', '*error': 'str' } }

##
# @DumpGuestMemoryCapability:
#
# A list of the available formats for dump-guest-memory
#
# Since: 2.0
##
{ 'struct': 'DumpGuestMemoryCapability',
  'data': {
      'formats': ['DumpGuestMemoryFormat'] } }

##
# @query-dump-guest-memory-capability:
#
# Returns the available formats for dump-guest-memory
#
# Returns:  A @DumpGuestMemoryCapability object listing available formats for
#           dump-guest-memory
#
# Since: 2.0
#
# Example:
#
# -> { "execute": "query-dump-guest-memory-capability" }
# <- { "return": { "formats":
#                  ["elf", "kdump-zlib", "kdump-lzo", "kdump-snappy"] }
#
##
{ 'command': 'query-dump-guest-memory-capability',
  'returns': 'DumpGuestMemoryCapability' }