iotests: Test migration with all kinds of filter nodes

#!/usr/bin/env python

#

# Copyright (C) 2019 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/>.

#

# Creator/Owner: Kevin Wolf <kwolf@redhat.com>

#

# Test migration with filter drivers present. Keep everything in an

# iothread just for fun.

import iotests

import os

iotests.verify_image_format(supported_fmts=['qcow2'])

iotests.verify_platform(['linux'])

with iotests.FilePath('img') as img_path, \

     iotests.FilePath('mig_fifo') as fifo, \

     iotests.VM(path_suffix='a') as vm_a, \

     iotests.VM(path_suffix='b') as vm_b:

    def add_opts(vm):

        vm.add_object('iothread,id=iothread0')

        vm.add_object('throttle-group,id=tg0,x-bps-total=65536')

        vm.add_blockdev('file,filename=%s,node-name=drive0-file' % (img_path))

        vm.add_blockdev('%s,file=drive0-file,node-name=drive0-fmt' % (iotests.imgfmt))

        vm.add_blockdev('copy-on-read,file=drive0-fmt,node-name=drive0-cor')

        vm.add_blockdev('throttle,file=drive0-cor,node-name=drive0-throttle,throttle-group=tg0')

        vm.add_blockdev('blkdebug,image=drive0-throttle,node-name=drive0-dbg')

        vm.add_blockdev('null-co,node-name=null,read-zeroes=on')

        vm.add_blockdev('blkverify,test=drive0-dbg,raw=null,node-name=drive0-verify')

        if iotests.supports_quorum():

            vm.add_blockdev('quorum,children.0=drive0-verify,vote-threshold=1,node-name=drive0-quorum')

            root = "drive0-quorum"

        else:

            root = "drive0-verify"

        vm.add_device('virtio-blk,drive=%s,iothread=iothread0' % root)

    iotests.qemu_img_pipe('create', '-f', iotests.imgfmt, img_path, '64M')

    os.mkfifo(fifo)

    iotests.log('Launching source VM...')

    add_opts(vm_a)

    vm_a.launch()

    vm_a.enable_migration_events('A')

    iotests.log('Launching destination VM...')

    add_opts(vm_b)

    vm_b.add_incoming("exec: cat '%s'" % (fifo))

    vm_b.launch()

    vm_b.enable_migration_events('B')

    iotests.log('Starting migration to B...')

    iotests.log(vm_a.qmp('migrate', uri='exec:cat >%s' % (fifo)))

    with iotests.Timeout(3, 'Migration does not complete'):

        # Wait for the source first (which includes setup=setup)

        vm_a.wait_migration()

        # Wait for the destination second (which does not)

        vm_b.wait_migration()

    iotests.log(vm_a.qmp('query-migrate')['return']['status'])

    iotests.log(vm_b.qmp('query-migrate')['return']['status'])

    iotests.log(vm_a.qmp('query-status'))

    iotests.log(vm_b.qmp('query-status'))

Launching source VM...

Enabling migration QMP events on A...

{"return": {}}

Launching destination VM...

Enabling migration QMP events on B...

{"return": {}}

Starting migration to B...

{"return": {}}

{"data": {"status": "setup"}, "event": "MIGRATION", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}}

{"data": {"status": "active"}, "event": "MIGRATION", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}}

{"data": {"status": "completed"}, "event": "MIGRATION", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}}

{"data": {"status": "active"}, "event": "MIGRATION", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}}

{"data": {"status": "completed"}, "event": "MIGRATION", "timestamp": {"microseconds": "USECS", "seconds": "SECS"}}

completed

completed

{"return": {"running": false, "singlestep": false, "status": "postmigrate"}}

{"return": {"running": true, "singlestep": false, "status": "running"}}

254 rw backing quick

255 rw quick

256 rw quick

262 rw quick migration