cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

render_block_graph.py (3813B)

      1#!/usr/bin/env python3
      2#
      3# Render Qemu Block Graph
      4#
      5# Copyright (c) 2018 Virtuozzo International GmbH. All rights reserved.
      6#
      7# This program is free software; you can redistribute it and/or modify
      8# it under the terms of the GNU General Public License as published by
      9# the Free Software Foundation; either version 2 of the License, or
     10# (at your option) any later version.
     11#
     12# This program is distributed in the hope that it will be useful,
     13# but WITHOUT ANY WARRANTY; without even the implied warranty of
     14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     15# GNU General Public License for more details.
     16#
     17# You should have received a copy of the GNU General Public License
     18# along with this program.  If not, see <http://www.gnu.org/licenses/>.
     19#
     20
     21import os
     22import sys
     23import subprocess
     24import json
     25from graphviz import Digraph
     26
     27sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'python'))
     28from qemu.qmp import (
     29    QEMUMonitorProtocol,
     30    QMPResponseError,
     31)
     32
     33
     34def perm(arr):
     35    s = 'w' if 'write' in arr else '_'
     36    s += 'r' if 'consistent-read' in arr else '_'
     37    s += 'u' if 'write-unchanged' in arr else '_'
     38    s += 'g' if 'graph-mod' in arr else '_'
     39    s += 's' if 'resize' in arr else '_'
     40    return s
     41
     42
     43def render_block_graph(qmp, filename, format='png'):
     44    '''
     45    Render graph in text (dot) representation into "@filename" and
     46    representation in @format into "@filename.@format"
     47    '''
     48
     49    bds_nodes = qmp.command('query-named-block-nodes')
     50    bds_nodes = {n['node-name']: n for n in bds_nodes}
     51
     52    job_nodes = qmp.command('query-block-jobs')
     53    job_nodes = {n['device']: n for n in job_nodes}
     54
     55    block_graph = qmp.command('x-debug-query-block-graph')
     56
     57    graph = Digraph(comment='Block Nodes Graph')
     58    graph.format = format
     59    graph.node('permission symbols:\l'
     60               '  w - Write\l'
     61               '  r - consistent-Read\l'
     62               '  u - write - Unchanged\l'
     63               '  g - Graph-mod\l'
     64               '  s - reSize\l'
     65               'edge label scheme:\l'
     66               '  <child type>\l'
     67               '  <perm>\l'
     68               '  <shared_perm>\l', shape='none')
     69
     70    for n in block_graph['nodes']:
     71        if n['type'] == 'block-driver':
     72            info = bds_nodes[n['name']]
     73            label = n['name'] + ' [' + info['drv'] + ']'
     74            if info['drv'] == 'file':
     75                label += '\n' + os.path.basename(info['file'])
     76            shape = 'ellipse'
     77        elif n['type'] == 'block-job':
     78            info = job_nodes[n['name']]
     79            label = info['type'] + ' job (' + n['name'] + ')'
     80            shape = 'box'
     81        else:
     82            assert n['type'] == 'block-backend'
     83            label = n['name'] if n['name'] else 'unnamed blk'
     84            shape = 'box'
     85
     86        graph.node(str(n['id']), label, shape=shape)
     87
     88    for e in block_graph['edges']:
     89        label = '%s\l%s\l%s\l' % (e['name'], perm(e['perm']),
     90                                  perm(e['shared-perm']))
     91        graph.edge(str(e['parent']), str(e['child']), label=label)
     92
     93    graph.render(filename)
     94
     95
     96class LibvirtGuest():
     97    def __init__(self, name):
     98        self.name = name
     99
    100    def command(self, cmd):
    101        # only supports qmp commands without parameters
    102        m = {'execute': cmd}
    103        ar = ['virsh', 'qemu-monitor-command', self.name, json.dumps(m)]
    104
    105        reply = json.loads(subprocess.check_output(ar))
    106
    107        if 'error' in reply:
    108            raise QMPResponseError(reply)
    109
    110        return reply['return']
    111
    112
    113if __name__ == '__main__':
    114    obj = sys.argv[1]
    115    out = sys.argv[2]
    116
    117    if os.path.exists(obj):
    118        # assume unix socket
    119        qmp = QEMUMonitorProtocol(obj)
    120        qmp.connect()
    121    else:
    122        # assume libvirt guest name
    123        qmp = LibvirtGuest(obj)
    124
    125    render_block_graph(qmp, out)