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qemu/scripts/analyze-migration.py
Chetan Pant 61f3c91a67 nomaintainer: Fix Lesser GPL version number 
There is no "version 2" of the "Lesser" General Public License.
It is either "GPL version 2.0" or "Lesser GPL version 2.1".
This patch replaces all occurrences of "Lesser GPL version 2" with
"Lesser GPL version 2.1" in comment section.

This patch contains all the files, whose maintainer I could not get
from ‘get_maintainer.pl’ script.

Signed-off-by: Chetan Pant <chetan4windows@gmail.com>
Message-Id: <20201023124424.20177-1-chetan4windows@gmail.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
[thuth: Adapted exec.c and qdev-monitor.c to new location]
Signed-off-by: Thomas Huth <thuth@redhat.com>
2020-11-15 17:04:40 +01:00

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#!/usr/bin/env python3
#
# Migration Stream Analyzer
#
# Copyright (c) 2015 Alexander Graf <agraf@suse.de>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, see <http://www.gnu.org/licenses/>.
import json
import os
import argparse
import collections
import struct
import sys
def mkdir_p(path):
try:
os.makedirs(path)
except OSError:
pass
class MigrationFile(object):
def __init__(self, filename):
self.filename = filename
self.file = open(self.filename, "rb")
def read64(self):
return int.from_bytes(self.file.read(8), byteorder='big', signed=True)
def read32(self):
return int.from_bytes(self.file.read(4), byteorder='big', signed=True)
def read16(self):
return int.from_bytes(self.file.read(2), byteorder='big', signed=True)
def read8(self):
return int.from_bytes(self.file.read(1), byteorder='big', signed=True)
def readstr(self, len = None):
return self.readvar(len).decode('utf-8')
def readvar(self, size = None):
if size is None:
size = self.read8()
if size == 0:
return ""
value = self.file.read(size)
if len(value) != size:
raise Exception("Unexpected end of %s at 0x%x" % (self.filename, self.file.tell()))
return value
def tell(self):
return self.file.tell()
# The VMSD description is at the end of the file, after EOF. Look for
# the last NULL byte, then for the beginning brace of JSON.
def read_migration_debug_json(self):
QEMU_VM_VMDESCRIPTION = 0x06
# Remember the offset in the file when we started
entrypos = self.file.tell()
# Read the last 10MB
self.file.seek(0, os.SEEK_END)
endpos = self.file.tell()
self.file.seek(max(-endpos, -10 * 1024 * 1024), os.SEEK_END)
datapos = self.file.tell()
data = self.file.read()
# The full file read closed the file as well, reopen it
self.file = open(self.filename, "rb")
# Find the last NULL byte, then the first brace after that. This should
# be the beginning of our JSON data.
nulpos = data.rfind(b'\0')
jsonpos = data.find(b'{', nulpos)
# Check backwards from there and see whether we guessed right
self.file.seek(datapos + jsonpos - 5, 0)
if self.read8() != QEMU_VM_VMDESCRIPTION:
raise Exception("No Debug Migration device found")
jsonlen = self.read32()
# Seek back to where we were at the beginning
self.file.seek(entrypos, 0)
# explicit decode() needed for Python 3.5 compatibility
return data[jsonpos:jsonpos + jsonlen].decode("utf-8")
def close(self):
self.file.close()
class RamSection(object):
RAM_SAVE_FLAG_COMPRESS = 0x02
RAM_SAVE_FLAG_MEM_SIZE = 0x04
RAM_SAVE_FLAG_PAGE = 0x08
RAM_SAVE_FLAG_EOS = 0x10
RAM_SAVE_FLAG_CONTINUE = 0x20
RAM_SAVE_FLAG_XBZRLE = 0x40
RAM_SAVE_FLAG_HOOK = 0x80
def __init__(self, file, version_id, ramargs, section_key):
if version_id != 4:
raise Exception("Unknown RAM version %d" % version_id)
self.file = file
self.section_key = section_key
self.TARGET_PAGE_SIZE = ramargs['page_size']
self.dump_memory = ramargs['dump_memory']
self.write_memory = ramargs['write_memory']
self.sizeinfo = collections.OrderedDict()
self.data = collections.OrderedDict()
self.data['section sizes'] = self.sizeinfo
self.name = ''
if self.write_memory:
self.files = { }
if self.dump_memory:
self.memory = collections.OrderedDict()
self.data['memory'] = self.memory
def __repr__(self):
return self.data.__repr__()
def __str__(self):
return self.data.__str__()
def getDict(self):
return self.data
def read(self):
# Read all RAM sections
while True:
addr = self.file.read64()
flags = addr & (self.TARGET_PAGE_SIZE - 1)
addr &= ~(self.TARGET_PAGE_SIZE - 1)
if flags & self.RAM_SAVE_FLAG_MEM_SIZE:
while True:
namelen = self.file.read8()
# We assume that no RAM chunk is big enough to ever
# hit the first byte of the address, so when we see
# a zero here we know it has to be an address, not the
# length of the next block.
if namelen == 0:
self.file.file.seek(-1, 1)
break
self.name = self.file.readstr(len = namelen)
len = self.file.read64()
self.sizeinfo[self.name] = '0x%016x' % len
if self.write_memory:
print(self.name)
mkdir_p('./' + os.path.dirname(self.name))
f = open('./' + self.name, "wb")
f.truncate(0)
f.truncate(len)
self.files[self.name] = f
flags &= ~self.RAM_SAVE_FLAG_MEM_SIZE
if flags & self.RAM_SAVE_FLAG_COMPRESS:
if flags & self.RAM_SAVE_FLAG_CONTINUE:
flags &= ~self.RAM_SAVE_FLAG_CONTINUE
else:
self.name = self.file.readstr()
fill_char = self.file.read8()
# The page in question is filled with fill_char now
if self.write_memory and fill_char != 0:
self.files[self.name].seek(addr, os.SEEK_SET)
self.files[self.name].write(chr(fill_char) * self.TARGET_PAGE_SIZE)
if self.dump_memory:
self.memory['%s (0x%016x)' % (self.name, addr)] = 'Filled with 0x%02x' % fill_char
flags &= ~self.RAM_SAVE_FLAG_COMPRESS
elif flags & self.RAM_SAVE_FLAG_PAGE:
if flags & self.RAM_SAVE_FLAG_CONTINUE:
flags &= ~self.RAM_SAVE_FLAG_CONTINUE
else:
self.name = self.file.readstr()
if self.write_memory or self.dump_memory:
data = self.file.readvar(size = self.TARGET_PAGE_SIZE)
else: # Just skip RAM data
self.file.file.seek(self.TARGET_PAGE_SIZE, 1)
if self.write_memory:
self.files[self.name].seek(addr, os.SEEK_SET)
self.files[self.name].write(data)
if self.dump_memory:
hexdata = " ".join("{0:02x}".format(ord(c)) for c in data)
self.memory['%s (0x%016x)' % (self.name, addr)] = hexdata
flags &= ~self.RAM_SAVE_FLAG_PAGE
elif flags & self.RAM_SAVE_FLAG_XBZRLE:
raise Exception("XBZRLE RAM compression is not supported yet")
elif flags & self.RAM_SAVE_FLAG_HOOK:
raise Exception("RAM hooks don't make sense with files")
# End of RAM section
if flags & self.RAM_SAVE_FLAG_EOS:
break
if flags != 0:
raise Exception("Unknown RAM flags: %x" % flags)
def __del__(self):
if self.write_memory:
for key in self.files:
self.files[key].close()
class HTABSection(object):
HASH_PTE_SIZE_64 = 16
def __init__(self, file, version_id, device, section_key):
if version_id != 1:
raise Exception("Unknown HTAB version %d" % version_id)
self.file = file
self.section_key = section_key
def read(self):
header = self.file.read32()
if (header == -1):
# "no HPT" encoding
return
if (header > 0):
# First section, just the hash shift
return
# Read until end marker
while True:
index = self.file.read32()
n_valid = self.file.read16()
n_invalid = self.file.read16()
if index == 0 and n_valid == 0 and n_invalid == 0:
break
self.file.readvar(n_valid * self.HASH_PTE_SIZE_64)
def getDict(self):
return ""
class ConfigurationSection(object):
def __init__(self, file):
self.file = file
def read(self):
name_len = self.file.read32()
name = self.file.readstr(len = name_len)
class VMSDFieldGeneric(object):
def __init__(self, desc, file):
self.file = file
self.desc = desc
self.data = ""
def __repr__(self):
return str(self.__str__())
def __str__(self):
return " ".join("{0:02x}".format(c) for c in self.data)
def getDict(self):
return self.__str__()
def read(self):
size = int(self.desc['size'])
self.data = self.file.readvar(size)
return self.data
class VMSDFieldInt(VMSDFieldGeneric):
def __init__(self, desc, file):
super(VMSDFieldInt, self).__init__(desc, file)
self.size = int(desc['size'])
self.format = '0x%%0%dx' % (self.size * 2)
self.sdtype = '>i%d' % self.size
self.udtype = '>u%d' % self.size
def __repr__(self):
if self.data < 0:
return ('%s (%d)' % ((self.format % self.udata), self.data))
else:
return self.format % self.data
def __str__(self):
return self.__repr__()
def getDict(self):
return self.__str__()
def read(self):
super(VMSDFieldInt, self).read()
self.sdata = int.from_bytes(self.data, byteorder='big', signed=True)
self.udata = int.from_bytes(self.data, byteorder='big', signed=False)
self.data = self.sdata
return self.data
class VMSDFieldUInt(VMSDFieldInt):
def __init__(self, desc, file):
super(VMSDFieldUInt, self).__init__(desc, file)
def read(self):
super(VMSDFieldUInt, self).read()
self.data = self.udata
return self.data
class VMSDFieldIntLE(VMSDFieldInt):
def __init__(self, desc, file):
super(VMSDFieldIntLE, self).__init__(desc, file)
self.dtype = '<i%d' % self.size
class VMSDFieldBool(VMSDFieldGeneric):
def __init__(self, desc, file):
super(VMSDFieldBool, self).__init__(desc, file)
def __repr__(self):
return self.data.__repr__()
def __str__(self):
return self.data.__str__()
def getDict(self):
return self.data
def read(self):
super(VMSDFieldBool, self).read()
if self.data[0] == 0:
self.data = False
else:
self.data = True
return self.data
class VMSDFieldStruct(VMSDFieldGeneric):
QEMU_VM_SUBSECTION = 0x05
def __init__(self, desc, file):
super(VMSDFieldStruct, self).__init__(desc, file)
self.data = collections.OrderedDict()
# When we see compressed array elements, unfold them here
new_fields = []
for field in self.desc['struct']['fields']:
if not 'array_len' in field:
new_fields.append(field)
continue
array_len = field.pop('array_len')
field['index'] = 0
new_fields.append(field)
for i in range(1, array_len):
c = field.copy()
c['index'] = i
new_fields.append(c)
self.desc['struct']['fields'] = new_fields
def __repr__(self):
return self.data.__repr__()
def __str__(self):
return self.data.__str__()
def read(self):
for field in self.desc['struct']['fields']:
try:
reader = vmsd_field_readers[field['type']]
except:
reader = VMSDFieldGeneric
field['data'] = reader(field, self.file)
field['data'].read()
if 'index' in field:
if field['name'] not in self.data:
self.data[field['name']] = []
a = self.data[field['name']]
if len(a) != int(field['index']):
raise Exception("internal index of data field unmatched (%d/%d)" % (len(a), int(field['index'])))
a.append(field['data'])
else:
self.data[field['name']] = field['data']
if 'subsections' in self.desc['struct']:
for subsection in self.desc['struct']['subsections']:
if self.file.read8() != self.QEMU_VM_SUBSECTION:
raise Exception("Subsection %s not found at offset %x" % ( subsection['vmsd_name'], self.file.tell()))
name = self.file.readstr()
version_id = self.file.read32()
self.data[name] = VMSDSection(self.file, version_id, subsection, (name, 0))
self.data[name].read()
def getDictItem(self, value):
# Strings would fall into the array category, treat
# them specially
if value.__class__ is ''.__class__:
return value
try:
return self.getDictOrderedDict(value)
except:
try:
return self.getDictArray(value)
except:
try:
return value.getDict()
except:
return value
def getDictArray(self, array):
r = []
for value in array:
r.append(self.getDictItem(value))
return r
def getDictOrderedDict(self, dict):
r = collections.OrderedDict()
for (key, value) in dict.items():
r[key] = self.getDictItem(value)
return r
def getDict(self):
return self.getDictOrderedDict(self.data)
vmsd_field_readers = {
"bool" : VMSDFieldBool,
"int8" : VMSDFieldInt,
"int16" : VMSDFieldInt,
"int32" : VMSDFieldInt,
"int32 equal" : VMSDFieldInt,
"int32 le" : VMSDFieldIntLE,
"int64" : VMSDFieldInt,
"uint8" : VMSDFieldUInt,
"uint16" : VMSDFieldUInt,
"uint32" : VMSDFieldUInt,
"uint32 equal" : VMSDFieldUInt,
"uint64" : VMSDFieldUInt,
"int64 equal" : VMSDFieldInt,
"uint8 equal" : VMSDFieldInt,
"uint16 equal" : VMSDFieldInt,
"float64" : VMSDFieldGeneric,
"timer" : VMSDFieldGeneric,
"buffer" : VMSDFieldGeneric,
"unused_buffer" : VMSDFieldGeneric,
"bitmap" : VMSDFieldGeneric,
"struct" : VMSDFieldStruct,
"unknown" : VMSDFieldGeneric,
}
class VMSDSection(VMSDFieldStruct):
def __init__(self, file, version_id, device, section_key):
self.file = file
self.data = ""
self.vmsd_name = ""
self.section_key = section_key
desc = device
if 'vmsd_name' in device:
self.vmsd_name = device['vmsd_name']
# A section really is nothing but a FieldStruct :)
super(VMSDSection, self).__init__({ 'struct' : desc }, file)
###############################################################################
class MigrationDump(object):
QEMU_VM_FILE_MAGIC = 0x5145564d
QEMU_VM_FILE_VERSION = 0x00000003
QEMU_VM_EOF = 0x00
QEMU_VM_SECTION_START = 0x01
QEMU_VM_SECTION_PART = 0x02
QEMU_VM_SECTION_END = 0x03
QEMU_VM_SECTION_FULL = 0x04
QEMU_VM_SUBSECTION = 0x05
QEMU_VM_VMDESCRIPTION = 0x06
QEMU_VM_CONFIGURATION = 0x07
QEMU_VM_SECTION_FOOTER= 0x7e
def __init__(self, filename):
self.section_classes = { ( 'ram', 0 ) : [ RamSection, None ],
( 'spapr/htab', 0) : ( HTABSection, None ) }
self.filename = filename
self.vmsd_desc = None
def read(self, desc_only = False, dump_memory = False, write_memory = False):
# Read in the whole file
file = MigrationFile(self.filename)
# File magic
data = file.read32()
if data != self.QEMU_VM_FILE_MAGIC:
raise Exception("Invalid file magic %x" % data)
# Version (has to be v3)
data = file.read32()
if data != self.QEMU_VM_FILE_VERSION:
raise Exception("Invalid version number %d" % data)
self.load_vmsd_json(file)
# Read sections
self.sections = collections.OrderedDict()
if desc_only:
return
ramargs = {}
ramargs['page_size'] = self.vmsd_desc['page_size']
ramargs['dump_memory'] = dump_memory
ramargs['write_memory'] = write_memory
self.section_classes[('ram',0)][1] = ramargs
while True:
section_type = file.read8()
if section_type == self.QEMU_VM_EOF:
break
elif section_type == self.QEMU_VM_CONFIGURATION:
section = ConfigurationSection(file)
section.read()
elif section_type == self.QEMU_VM_SECTION_START or section_type == self.QEMU_VM_SECTION_FULL:
section_id = file.read32()
name = file.readstr()
instance_id = file.read32()
version_id = file.read32()
section_key = (name, instance_id)
classdesc = self.section_classes[section_key]
section = classdesc[0](file, version_id, classdesc[1], section_key)
self.sections[section_id] = section
section.read()
elif section_type == self.QEMU_VM_SECTION_PART or section_type == self.QEMU_VM_SECTION_END:
section_id = file.read32()
self.sections[section_id].read()
elif section_type == self.QEMU_VM_SECTION_FOOTER:
read_section_id = file.read32()
if read_section_id != section_id:
raise Exception("Mismatched section footer: %x vs %x" % (read_section_id, section_id))
else:
raise Exception("Unknown section type: %d" % section_type)
file.close()
def load_vmsd_json(self, file):
vmsd_json = file.read_migration_debug_json()
self.vmsd_desc = json.loads(vmsd_json, object_pairs_hook=collections.OrderedDict)
for device in self.vmsd_desc['devices']:
key = (device['name'], device['instance_id'])
value = ( VMSDSection, device )
self.section_classes[key] = value
def getDict(self):
r = collections.OrderedDict()
for (key, value) in self.sections.items():
key = "%s (%d)" % ( value.section_key[0], key )
r[key] = value.getDict()
return r
###############################################################################
class JSONEncoder(json.JSONEncoder):
def default(self, o):
if isinstance(o, VMSDFieldGeneric):
return str(o)
return json.JSONEncoder.default(self, o)
parser = argparse.ArgumentParser()
parser.add_argument("-f", "--file", help='migration dump to read from', required=True)
parser.add_argument("-m", "--memory", help='dump RAM contents as well', action='store_true')
parser.add_argument("-d", "--dump", help='what to dump ("state" or "desc")', default='state')
parser.add_argument("-x", "--extract", help='extract contents into individual files', action='store_true')
args = parser.parse_args()
jsonenc = JSONEncoder(indent=4, separators=(',', ': '))
if args.extract:
dump = MigrationDump(args.file)
dump.read(desc_only = True)
print("desc.json")
f = open("desc.json", "wb")
f.truncate()
f.write(jsonenc.encode(dump.vmsd_desc))
f.close()
dump.read(write_memory = True)
dict = dump.getDict()
print("state.json")
f = open("state.json", "wb")
f.truncate()
f.write(jsonenc.encode(dict))
f.close()
elif args.dump == "state":
dump = MigrationDump(args.file)
dump.read(dump_memory = args.memory)
dict = dump.getDict()
print(jsonenc.encode(dict))
elif args.dump == "desc":
dump = MigrationDump(args.file)
dump.read(desc_only = True)
print(jsonenc.encode(dump.vmsd_desc))
else:
raise Exception("Please specify either -x, -d state or -d dump")
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