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

044 (3860B)

      1#!/usr/bin/env python3
      2# group: rw
      3#
      4# Tests growing a large refcount table.
      5#
      6# Copyright (C) 2012 Red Hat, Inc.
      7#
      8# This program is free software; you can redistribute it and/or modify
      9# it under the terms of the GNU General Public License as published by
     10# the Free Software Foundation; either version 2 of the License, or
     11# (at your option) any later version.
     12#
     13# This program is distributed in the hope that it will be useful,
     14# but WITHOUT ANY WARRANTY; without even the implied warranty of
     15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     16# GNU General Public License for more details.
     17#
     18# You should have received a copy of the GNU General Public License
     19# along with this program.  If not, see <http://www.gnu.org/licenses/>.
     20#
     21
     22import time
     23import os
     24import qcow2
     25from qcow2 import QcowHeader
     26import iotests
     27from iotests import qemu_img, qemu_img_verbose, qemu_io
     28import struct
     29import subprocess
     30import sys
     31
     32test_img = os.path.join(iotests.test_dir, 'test.img')
     33
     34class TestRefcountTableGrowth(iotests.QMPTestCase):
     35    '''Abstract base class for image mirroring test cases'''
     36
     37    def preallocate(self, name):
     38        fd = open(name, "r+b")
     39        try:
     40            off_reftable = 512
     41            off_refblock = off_reftable + (512 * 512)
     42            off_l1       = off_refblock + (512 * 512 * 64)
     43            off_l2       = off_l1 + (512 * 512 * 4 * 8)
     44            off_data     = off_l2 + (512 * 512 * 4 * 512)
     45
     46            # Write a new header
     47            h = QcowHeader(fd)
     48            h.refcount_table_offset = off_reftable
     49            h.refcount_table_clusters = 512
     50            h.l1_table_offset = off_l1
     51            h.l1_size = 512 * 512 * 4
     52            h.update(fd)
     53
     54            # Write a refcount table
     55            fd.seek(off_reftable)
     56
     57            for i in range(0, h.refcount_table_clusters):
     58                sector = b''.join(struct.pack('>Q',
     59                    off_refblock + i * 64 * 512 + j * 512)
     60                    for j in range(0, 64))
     61                fd.write(sector)
     62
     63            # Write the refcount blocks
     64            assert(fd.tell() == off_refblock)
     65            sector = b''.join(struct.pack('>H', 1) for j in range(0, 64 * 256))
     66            for block in range(0, h.refcount_table_clusters):
     67                fd.write(sector)
     68
     69            # Write the L1 table
     70            assert(fd.tell() == off_l1)
     71            assert(off_l2 + 512 * h.l1_size == off_data)
     72            table = b''.join(struct.pack('>Q', (1 << 63) | off_l2 + 512 * j)
     73                for j in range(0, h.l1_size))
     74            fd.write(table)
     75
     76            # Write the L2 tables
     77            assert(fd.tell() == off_l2)
     78            img_file_size = h.refcount_table_clusters * 64 * 256 * 512
     79            remaining = img_file_size - off_data
     80
     81            off = off_data
     82            while remaining > 1024 * 512:
     83                pytable = list((1 << 63) | off + 512 * j
     84                    for j in range(0, 1024))
     85                table = struct.pack('>1024Q', *pytable)
     86                fd.write(table)
     87                remaining = remaining - 1024 * 512
     88                off = off + 1024 * 512
     89
     90            table = b''.join(struct.pack('>Q', (1 << 63) | off + 512 * j)
     91                for j in range(0, remaining // 512))
     92            fd.write(table)
     93
     94
     95            # Data
     96            fd.truncate(img_file_size)
     97
     98
     99        finally:
    100            fd.close()
    101
    102
    103    def setUp(self):
    104        qemu_img('create', '-f', iotests.imgfmt, '-o', 'cluster_size=512', test_img, '16G')
    105        self.preallocate(test_img)
    106        pass
    107
    108
    109    def tearDown(self):
    110        os.remove(test_img)
    111        pass
    112
    113    def test_grow_refcount_table(self):
    114        qemu_io('-c', 'write 3800M 1M', test_img)
    115        qemu_img_verbose('check' , test_img)
    116        pass
    117
    118if __name__ == '__main__':
    119    iotests.main(supported_fmts=['qcow2'],
    120                 supported_protocols=['file'])