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qemu/scripts/vmstate-static-checker.py
Amit Shah 426d1d016a vmstate-static-checker: script to validate vmstate changes 
This script compares the vmstate dumps in JSON format as output by QEMU
with the -dump-vmstate option.

It flags various errors, like version mismatch, sections going away,
size mismatches, etc.

This script is tolerant of a few changes that do not change the on-wire
format, like embedding a few fields within substructs.

The script takes -s/--src and -d/--dest parameters, to which filenames
are given as arguments.

Example:

(in a qemu 2.0 tree):
./x86_64-softmmu/qemu-system-x86_64 -dump-vmstate qemu-2.0.json

(in a qemu 2.2 tree:)
./x86_64-softmmu/qemu-system-x86_64 -dump-vmstate -M pc-i440fx-2.0 \
   qemu-2.2-m2.0.json

./scripts/vmstate-static-checker.py -s qemu-2.0.json -d qemu-2.2-m2.0.json

The script also takes a --reverse parameter to switch the src and dest
jsons.  This is just a shorthand for reversing the src and dest.

The --help parameter shows usage information.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
2014-06-23 19:14:51 +02:00

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#!/usr/bin/python
#
# Compares vmstate information stored in JSON format, obtained from
# the -dump-vmstate QEMU command.
#
# Copyright 2014 Amit Shah <amit.shah@redhat.com>
# Copyright 2014 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, see <http://www.gnu.org/licenses/>.
import argparse
import json
import sys
# Count the number of errors found
taint = 0
def bump_taint():
global taint
# Ensure we don't wrap around or reset to 0 -- the shell only has
# an 8-bit return value.
if taint < 255:
taint = taint + 1
def check_fields_match(name, s_field, d_field):
if s_field == d_field:
return True
# Some fields changed names between qemu versions. This list
# is used to whitelist such changes in each section / description.
changed_names = {
'e1000': ['dev', 'parent_obj'],
'ehci': ['dev', 'pcidev'],
'I440FX': ['dev', 'parent_obj'],
'ich9_ahci': ['card', 'parent_obj'],
'ioh-3240-express-root-port': ['port.br.dev',
'parent_obj.parent_obj.parent_obj',
'port.br.dev.exp.aer_log',
'parent_obj.parent_obj.parent_obj.exp.aer_log'],
'mch': ['d', 'parent_obj'],
'pci_bridge': ['bridge.dev', 'parent_obj', 'bridge.dev.shpc', 'shpc'],
'pcnet': ['pci_dev', 'parent_obj'],
'PIIX3': ['pci_irq_levels', 'pci_irq_levels_vmstate'],
'piix4_pm': ['dev', 'parent_obj', 'pci0_status',
'acpi_pci_hotplug.acpi_pcihp_pci_status[0x0]'],
'rtl8139': ['dev', 'parent_obj'],
'qxl': ['num_surfaces', 'ssd.num_surfaces'],
'usb-host': ['dev', 'parent_obj'],
'usb-mouse': ['usb-ptr-queue', 'HIDPointerEventQueue'],
'usb-tablet': ['usb-ptr-queue', 'HIDPointerEventQueue'],
'xhci': ['pci_dev', 'parent_obj'],
'xio3130-express-downstream-port': ['port.br.dev',
'parent_obj.parent_obj.parent_obj',
'port.br.dev.exp.aer_log',
'parent_obj.parent_obj.parent_obj.exp.aer_log'],
'xio3130-express-upstream-port': ['br.dev', 'parent_obj.parent_obj',
'br.dev.exp.aer_log',
'parent_obj.parent_obj.exp.aer_log'],
}
if not name in changed_names:
return False
if s_field in changed_names[name] and d_field in changed_names[name]:
return True
return False
def exists_in_substruct(fields, item):
# Some QEMU versions moved a few fields inside a substruct. This
# kept the on-wire format the same. This function checks if
# something got shifted inside a substruct. For example, the
# change in commit 1f42d22233b4f3d1a2933ff30e8d6a6d9ee2d08f
if not "Description" in fields:
return False
if not "Fields" in fields["Description"]:
return False
substruct_fields = fields["Description"]["Fields"]
if substruct_fields == []:
return False
return check_fields_match(fields["Description"]["name"],
substruct_fields[0]["field"], item)
def check_fields(src_fields, dest_fields, desc, sec):
# This function checks for all the fields in a section. If some
# fields got embedded into a substruct, this function will also
# attempt to check inside the substruct.
d_iter = iter(dest_fields)
s_iter = iter(src_fields)
# Using these lists as stacks to store previous value of s_iter
# and d_iter, so that when time comes to exit out of a substruct,
# we can go back one level up and continue from where we left off.
s_iter_list = []
d_iter_list = []
advance_src = True
advance_dest = True
while True:
if advance_src:
try:
s_item = s_iter.next()
except StopIteration:
if s_iter_list == []:
break
s_iter = s_iter_list.pop()
continue
else:
# We want to avoid advancing just once -- when entering a
# dest substruct, or when exiting one.
advance_src = True
if advance_dest:
try:
d_item = d_iter.next()
except StopIteration:
if d_iter_list == []:
# We were not in a substruct
print "Section \"" + sec + "\",",
print "Description " + "\"" + desc + "\":",
print "expected field \"" + s_item["field"] + "\",",
print "while dest has no further fields"
bump_taint()
break
d_iter = d_iter_list.pop()
advance_src = False
continue
else:
advance_dest = True
if not check_fields_match(desc, s_item["field"], d_item["field"]):
# Some fields were put in substructs, keeping the
# on-wire format the same, but breaking static tools
# like this one.
# First, check if dest has a new substruct.
if exists_in_substruct(d_item, s_item["field"]):
# listiterators don't have a prev() function, so we
# have to store our current location, descend into the
# substruct, and ensure we come out as if nothing
# happened when the substruct is over.
#
# Essentially we're opening the substructs that got
# added which didn't change the wire format.
d_iter_list.append(d_iter)
substruct_fields = d_item["Description"]["Fields"]
d_iter = iter(substruct_fields)
advance_src = False
continue
# Next, check if src has substruct that dest removed
# (can happen in backward migration: 2.0 -> 1.5)
if exists_in_substruct(s_item, d_item["field"]):
s_iter_list.append(s_iter)
substruct_fields = s_item["Description"]["Fields"]
s_iter = iter(substruct_fields)
advance_dest = False
continue
print "Section \"" + sec + "\",",
print "Description \"" + desc + "\":",
print "expected field \"" + s_item["field"] + "\",",
print "got \"" + d_item["field"] + "\"; skipping rest"
bump_taint()
break
check_version(s_item, d_item, sec, desc)
if not "Description" in s_item:
# Check size of this field only if it's not a VMSTRUCT entry
check_size(s_item, d_item, sec, desc, s_item["field"])
check_description_in_list(s_item, d_item, sec, desc)
def check_subsections(src_sub, dest_sub, desc, sec):
for s_item in src_sub:
found = False
for d_item in dest_sub:
if s_item["name"] != d_item["name"]:
continue
found = True
check_descriptions(s_item, d_item, sec)
if not found:
print "Section \"" + sec + "\", Description \"" + desc + "\":",
print "Subsection \"" + s_item["name"] + "\" not found"
bump_taint()
def check_description_in_list(s_item, d_item, sec, desc):
if not "Description" in s_item:
return
if not "Description" in d_item:
print "Section \"" + sec + "\", Description \"" + desc + "\",",
print "Field \"" + s_item["field"] + "\": missing description"
bump_taint()
return
check_descriptions(s_item["Description"], d_item["Description"], sec)
def check_descriptions(src_desc, dest_desc, sec):
check_version(src_desc, dest_desc, sec, src_desc["name"])
if not check_fields_match(sec, src_desc["name"], dest_desc["name"]):
print "Section \"" + sec + "\":",
print "Description \"" + src_desc["name"] + "\"",
print "missing, got \"" + dest_desc["name"] + "\" instead; skipping"
bump_taint()
return
for f in src_desc:
if not f in dest_desc:
print "Section \"" + sec + "\"",
print "Description \"" + src_desc["name"] + "\":",
print "Entry \"" + f + "\" missing"
bump_taint()
continue
if f == 'Fields':
check_fields(src_desc[f], dest_desc[f], src_desc["name"], sec)
if f == 'Subsections':
check_subsections(src_desc[f], dest_desc[f], src_desc["name"], sec)
def check_version(s, d, sec, desc=None):
if s["version_id"] > d["version_id"]:
print "Section \"" + sec + "\"",
if desc:
print "Description \"" + desc + "\":",
print "version error:", s["version_id"], ">", d["version_id"]
bump_taint()
if not "minimum_version_id" in d:
return
if s["version_id"] < d["minimum_version_id"]:
print "Section \"" + sec + "\"",
if desc:
print "Description \"" + desc + "\":",
print "minimum version error:", s["version_id"], "<",
print d["minimum_version_id"]
bump_taint()
def check_size(s, d, sec, desc=None, field=None):
if s["size"] != d["size"]:
print "Section \"" + sec + "\"",
if desc:
print "Description \"" + desc + "\"",
if field:
print "Field \"" + field + "\"",
print "size mismatch:", s["size"], ",", d["size"]
bump_taint()
def check_machine_type(s, d):
if s["Name"] != d["Name"]:
print "Warning: checking incompatible machine types:",
print "\"" + s["Name"] + "\", \"" + d["Name"] + "\""
return
def main():
help_text = "Parse JSON-formatted vmstate dumps from QEMU in files SRC and DEST. Checks whether migration from SRC to DEST QEMU versions would break based on the VMSTATE information contained within the JSON outputs. The JSON output is created from a QEMU invocation with the -dump-vmstate parameter and a filename argument to it. Other parameters to QEMU do not matter, except the -M (machine type) parameter."
parser = argparse.ArgumentParser(description=help_text)
parser.add_argument('-s', '--src', type=file, required=True,
help='json dump from src qemu')
parser.add_argument('-d', '--dest', type=file, required=True,
help='json dump from dest qemu')
parser.add_argument('--reverse', required=False, default=False,
action='store_true',
help='reverse the direction')
args = parser.parse_args()
src_data = json.load(args.src)
dest_data = json.load(args.dest)
args.src.close()
args.dest.close()
if args.reverse:
temp = src_data
src_data = dest_data
dest_data = temp
for sec in src_data:
if not sec in dest_data:
print "Section \"" + sec + "\" does not exist in dest"
bump_taint()
continue
s = src_data[sec]
d = dest_data[sec]
if sec == "vmschkmachine":
check_machine_type(s, d)
continue
check_version(s, d, sec)
for entry in s:
if not entry in d:
print "Section \"" + sec + "\": Entry \"" + entry + "\"",
print "missing"
bump_taint()
continue
if entry == "Description":
check_descriptions(s[entry], d[entry], sec)
return taint
if __name__ == '__main__':
sys.exit(main())
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