Add migration stream analyzation script
This patch adds a python tool to the scripts directory that can read
a dumped migration stream if it contains the JSON description of the
device states. I constructs a human readable JSON stream out of it.
It's very simple to use:
$ qemu-system-x86_64
(qemu) migrate "exec:cat > mig"
$ ./scripts/analyze_migration.py -f mig
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Alexander Graf
Juan Quintela
parent
8118f0950f
commit
b17425701d
592
scripts/analyze-migration.py
Executable file
592
scripts/analyze-migration.py
Executable file
@ -0,0 +1,592 @@
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#!/usr/bin/env python
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#
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# Migration Stream Analyzer
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#
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# Copyright (c) 2015 Alexander Graf <agraf@suse.de>
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, see <http://www.gnu.org/licenses/>.
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import numpy as np
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import json
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import os
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import argparse
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import collections
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import pprint
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def mkdir_p(path):
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try:
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os.makedirs(path)
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except OSError:
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pass
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class MigrationFile(object):
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def __init__(self, filename):
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self.filename = filename
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self.file = open(self.filename, "rb")
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def read64(self):
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return np.asscalar(np.fromfile(self.file, count=1, dtype='>i8')[0])
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def read32(self):
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return np.asscalar(np.fromfile(self.file, count=1, dtype='>i4')[0])
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def read16(self):
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return np.asscalar(np.fromfile(self.file, count=1, dtype='>i2')[0])
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def read8(self):
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return np.asscalar(np.fromfile(self.file, count=1, dtype='>i1')[0])
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def readstr(self, len = None):
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if len is None:
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len = self.read8()
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if len == 0:
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return ""
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return np.fromfile(self.file, count=1, dtype=('S%d' % len))[0]
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def readvar(self, size = None):
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if size is None:
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size = self.read8()
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if size == 0:
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return ""
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value = self.file.read(size)
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if len(value) != size:
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raise Exception("Unexpected end of %s at 0x%x" % (self.filename, self.file.tell()))
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return value
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def tell(self):
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return self.file.tell()
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# The VMSD description is at the end of the file, after EOF. Look for
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# the last NULL byte, then for the beginning brace of JSON.
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def read_migration_debug_json(self):
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QEMU_VM_VMDESCRIPTION = 0x06
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# Remember the offset in the file when we started
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entrypos = self.file.tell()
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# Read the last 10MB
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self.file.seek(0, os.SEEK_END)
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endpos = self.file.tell()
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self.file.seek(max(-endpos, -10 * 1024 * 1024), os.SEEK_END)
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datapos = self.file.tell()
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data = self.file.read()
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# The full file read closed the file as well, reopen it
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self.file = open(self.filename, "rb")
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# Find the last NULL byte, then the first brace after that. This should
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# be the beginning of our JSON data.
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nulpos = data.rfind("\0")
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jsonpos = data.find("{", nulpos)
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# Check backwards from there and see whether we guessed right
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self.file.seek(datapos + jsonpos - 5, 0)
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if self.read8() != QEMU_VM_VMDESCRIPTION:
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raise Exception("No Debug Migration device found")
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jsonlen = self.read32()
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# Seek back to where we were at the beginning
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self.file.seek(entrypos, 0)
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return data[jsonpos:jsonpos + jsonlen]
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def close(self):
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self.file.close()
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class RamSection(object):
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RAM_SAVE_FLAG_COMPRESS = 0x02
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RAM_SAVE_FLAG_MEM_SIZE = 0x04
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RAM_SAVE_FLAG_PAGE = 0x08
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RAM_SAVE_FLAG_EOS = 0x10
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RAM_SAVE_FLAG_CONTINUE = 0x20
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RAM_SAVE_FLAG_XBZRLE = 0x40
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RAM_SAVE_FLAG_HOOK = 0x80
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def __init__(self, file, version_id, ramargs, section_key):
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if version_id != 4:
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raise Exception("Unknown RAM version %d" % version_id)
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self.file = file
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self.section_key = section_key
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self.TARGET_PAGE_SIZE = ramargs['page_size']
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self.dump_memory = ramargs['dump_memory']
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self.write_memory = ramargs['write_memory']
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self.sizeinfo = collections.OrderedDict()
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self.data = collections.OrderedDict()
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self.data['section sizes'] = self.sizeinfo
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self.name = ''
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if self.write_memory:
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self.files = { }
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if self.dump_memory:
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self.memory = collections.OrderedDict()
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self.data['memory'] = self.memory
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def __repr__(self):
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return self.data.__repr__()
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def __str__(self):
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return self.data.__str__()
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def getDict(self):
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return self.data
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def read(self):
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# Read all RAM sections
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while True:
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addr = self.file.read64()
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flags = addr & (self.TARGET_PAGE_SIZE - 1)
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addr &= ~(self.TARGET_PAGE_SIZE - 1)
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if flags & self.RAM_SAVE_FLAG_MEM_SIZE:
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while True:
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namelen = self.file.read8()
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# We assume that no RAM chunk is big enough to ever
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# hit the first byte of the address, so when we see
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# a zero here we know it has to be an address, not the
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# length of the next block.
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if namelen == 0:
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self.file.file.seek(-1, 1)
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break
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self.name = self.file.readstr(len = namelen)
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len = self.file.read64()
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self.sizeinfo[self.name] = '0x%016x' % len
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if self.write_memory:
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print self.name
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mkdir_p('./' + os.path.dirname(self.name))
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f = open('./' + self.name, "wb")
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f.truncate(0)
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f.truncate(len)
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self.files[self.name] = f
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flags &= ~self.RAM_SAVE_FLAG_MEM_SIZE
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if flags & self.RAM_SAVE_FLAG_COMPRESS:
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if flags & self.RAM_SAVE_FLAG_CONTINUE:
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flags &= ~self.RAM_SAVE_FLAG_CONTINUE
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else:
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self.name = self.file.readstr()
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fill_char = self.file.read8()
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# The page in question is filled with fill_char now
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if self.write_memory and fill_char != 0:
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self.files[self.name].seek(addr, os.SEEK_SET)
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self.files[self.name].write(chr(fill_char) * self.TARGET_PAGE_SIZE)
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if self.dump_memory:
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self.memory['%s (0x%016x)' % (self.name, addr)] = 'Filled with 0x%02x' % fill_char
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flags &= ~self.RAM_SAVE_FLAG_COMPRESS
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elif flags & self.RAM_SAVE_FLAG_PAGE:
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if flags & self.RAM_SAVE_FLAG_CONTINUE:
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flags &= ~self.RAM_SAVE_FLAG_CONTINUE
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else:
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self.name = self.file.readstr()
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if self.write_memory or self.dump_memory:
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data = self.file.readvar(size = self.TARGET_PAGE_SIZE)
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else: # Just skip RAM data
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self.file.file.seek(self.TARGET_PAGE_SIZE, 1)
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if self.write_memory:
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self.files[self.name].seek(addr, os.SEEK_SET)
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self.files[self.name].write(data)
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if self.dump_memory:
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hexdata = " ".join("{0:02x}".format(ord(c)) for c in data)
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self.memory['%s (0x%016x)' % (self.name, addr)] = hexdata
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flags &= ~self.RAM_SAVE_FLAG_PAGE
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elif flags & self.RAM_SAVE_FLAG_XBZRLE:
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raise Exception("XBZRLE RAM compression is not supported yet")
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elif flags & self.RAM_SAVE_FLAG_HOOK:
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raise Exception("RAM hooks don't make sense with files")
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# End of RAM section
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if flags & self.RAM_SAVE_FLAG_EOS:
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break
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if flags != 0:
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raise Exception("Unknown RAM flags: %x" % flags)
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def __del__(self):
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if self.write_memory:
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for key in self.files:
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self.files[key].close()
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class HTABSection(object):
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HASH_PTE_SIZE_64 = 16
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def __init__(self, file, version_id, device, section_key):
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if version_id != 1:
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raise Exception("Unknown HTAB version %d" % version_id)
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self.file = file
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self.section_key = section_key
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def read(self):
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header = self.file.read32()
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if (header > 0):
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# First section, just the hash shift
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return
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# Read until end marker
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while True:
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index = self.file.read32()
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n_valid = self.file.read16()
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n_invalid = self.file.read16()
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if index == 0 and n_valid == 0 and n_invalid == 0:
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break
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self.file.readvar(n_valid * HASH_PTE_SIZE_64)
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def getDict(self):
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return ""
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class VMSDFieldGeneric(object):
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def __init__(self, desc, file):
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self.file = file
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self.desc = desc
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self.data = ""
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def __repr__(self):
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return str(self.__str__())
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def __str__(self):
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return " ".join("{0:02x}".format(ord(c)) for c in self.data)
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def getDict(self):
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return self.__str__()
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def read(self):
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size = int(self.desc['size'])
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self.data = self.file.readvar(size)
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return self.data
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class VMSDFieldInt(VMSDFieldGeneric):
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def __init__(self, desc, file):
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super(VMSDFieldInt, self).__init__(desc, file)
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self.size = int(desc['size'])
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self.format = '0x%%0%dx' % (self.size * 2)
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self.sdtype = '>i%d' % self.size
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self.udtype = '>u%d' % self.size
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def __repr__(self):
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if self.data < 0:
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return ('%s (%d)' % ((self.format % self.udata), self.data))
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else:
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return self.format % self.data
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def __str__(self):
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return self.__repr__()
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def getDict(self):
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return self.__str__()
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def read(self):
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super(VMSDFieldInt, self).read()
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self.sdata = np.fromstring(self.data, count=1, dtype=(self.sdtype))[0]
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self.udata = np.fromstring(self.data, count=1, dtype=(self.udtype))[0]
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self.data = self.sdata
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return self.data
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class VMSDFieldUInt(VMSDFieldInt):
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def __init__(self, desc, file):
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super(VMSDFieldUInt, self).__init__(desc, file)
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def read(self):
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super(VMSDFieldUInt, self).read()
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self.data = self.udata
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return self.data
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class VMSDFieldIntLE(VMSDFieldInt):
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def __init__(self, desc, file):
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super(VMSDFieldIntLE, self).__init__(desc, file)
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self.dtype = '<i%d' % self.size
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class VMSDFieldBool(VMSDFieldGeneric):
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def __init__(self, desc, file):
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super(VMSDFieldBool, self).__init__(desc, file)
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def __repr__(self):
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return self.data.__repr__()
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def __str__(self):
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return self.data.__str__()
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def getDict(self):
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return self.data
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def read(self):
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super(VMSDFieldBool, self).read()
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if self.data[0] == 0:
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self.data = False
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else:
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self.data = True
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return self.data
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class VMSDFieldStruct(VMSDFieldGeneric):
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QEMU_VM_SUBSECTION = 0x05
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def __init__(self, desc, file):
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super(VMSDFieldStruct, self).__init__(desc, file)
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self.data = collections.OrderedDict()
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# When we see compressed array elements, unfold them here
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new_fields = []
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for field in self.desc['struct']['fields']:
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if not 'array_len' in field:
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new_fields.append(field)
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continue
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array_len = field.pop('array_len')
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field['index'] = 0
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new_fields.append(field)
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for i in xrange(1, array_len):
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c = field.copy()
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c['index'] = i
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new_fields.append(c)
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self.desc['struct']['fields'] = new_fields
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def __repr__(self):
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return self.data.__repr__()
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def __str__(self):
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return self.data.__str__()
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def read(self):
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for field in self.desc['struct']['fields']:
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try:
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reader = vmsd_field_readers[field['type']]
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except:
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reader = VMSDFieldGeneric
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field['data'] = reader(field, self.file)
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field['data'].read()
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if 'index' in field:
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if field['name'] not in self.data:
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self.data[field['name']] = []
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a = self.data[field['name']]
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if len(a) != int(field['index']):
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raise Exception("internal index of data field unmatched (%d/%d)" % (len(a), int(field['index'])))
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a.append(field['data'])
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else:
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self.data[field['name']] = field['data']
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if 'subsections' in self.desc['struct']:
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for subsection in self.desc['struct']['subsections']:
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if self.file.read8() != self.QEMU_VM_SUBSECTION:
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raise Exception("Subsection %s not found at offset %x" % ( subsection['vmsd_name'], self.file.tell()))
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name = self.file.readstr()
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version_id = self.file.read32()
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self.data[name] = VMSDSection(self.file, version_id, subsection, (name, 0))
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self.data[name].read()
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def getDictItem(self, value):
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# Strings would fall into the array category, treat
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# them specially
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if value.__class__ is ''.__class__:
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return value
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try:
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return self.getDictOrderedDict(value)
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except:
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try:
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return self.getDictArray(value)
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except:
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try:
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return value.getDict()
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except:
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return value
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def getDictArray(self, array):
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r = []
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for value in array:
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r.append(self.getDictItem(value))
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return r
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def getDictOrderedDict(self, dict):
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r = collections.OrderedDict()
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for (key, value) in dict.items():
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r[key] = self.getDictItem(value)
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return r
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def getDict(self):
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return self.getDictOrderedDict(self.data)
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vmsd_field_readers = {
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"bool" : VMSDFieldBool,
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"int8" : VMSDFieldInt,
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"int16" : VMSDFieldInt,
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"int32" : VMSDFieldInt,
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"int32 equal" : VMSDFieldInt,
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"int32 le" : VMSDFieldIntLE,
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"int64" : VMSDFieldInt,
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"uint8" : VMSDFieldUInt,
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"uint16" : VMSDFieldUInt,
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"uint32" : VMSDFieldUInt,
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"uint32 equal" : VMSDFieldUInt,
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"uint64" : VMSDFieldUInt,
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"int64 equal" : VMSDFieldInt,
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"uint8 equal" : VMSDFieldInt,
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"uint16 equal" : VMSDFieldInt,
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"float64" : VMSDFieldGeneric,
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"timer" : VMSDFieldGeneric,
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"buffer" : VMSDFieldGeneric,
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"unused_buffer" : VMSDFieldGeneric,
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"bitmap" : VMSDFieldGeneric,
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"struct" : VMSDFieldStruct,
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"unknown" : VMSDFieldGeneric,
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}
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class VMSDSection(VMSDFieldStruct):
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def __init__(self, file, version_id, device, section_key):
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self.file = file
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self.data = ""
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self.vmsd_name = ""
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self.section_key = section_key
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desc = device
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if 'vmsd_name' in device:
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self.vmsd_name = device['vmsd_name']
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# A section really is nothing but a FieldStruct :)
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super(VMSDSection, self).__init__({ 'struct' : desc }, file)
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###############################################################################
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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
|
||||
|
||||
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_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()
|
||||
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")
|
||||
Loading…
Reference in New Issue
Block a user