Re: [Qemu-devel] [PATCH 11/12] iotests: add dirty bitmap migration test

[John Snow <jsnow@redhat.com>]

On 05/13/2015 11:30 AM, Vladimir Sementsov-Ogievskiy wrote:
> The test starts two vms (vm_a, vm_b), create dirty bitmap in
> the first one, do several writes to corresponding device and
> then migrate vm_a to vm_b with dirty bitmaps.
> 
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@parallels.com>
> ---
>  tests/qemu-iotests/117     | 84 ++++++++++++++++++++++++++++++++++++++++++++++
>  tests/qemu-iotests/117.out |  5 +++
>  tests/qemu-iotests/group   |  1 +
>  3 files changed, 90 insertions(+)
>  create mode 100755 tests/qemu-iotests/117
>  create mode 100644 tests/qemu-iotests/117.out
> 
> diff --git a/tests/qemu-iotests/117 b/tests/qemu-iotests/117
> new file mode 100755
> index 0000000..9fab5d0
> --- /dev/null
> +++ b/tests/qemu-iotests/117
> @@ -0,0 +1,84 @@
> +#!/usr/bin/env python
> +#
> +# Tests for dirty bitmaps migration.
> +#
> +# (C) Vladimir Sementsov-Ogievskiy 2015
> +#
> +# 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 os
> +import iotests
> +import time
> +from iotests import qemu_img
> +
> +disk_a = os.path.join(iotests.test_dir, 'disk_a')
> +disk_b = os.path.join(iotests.test_dir, 'disk_b')
> +fifo   = os.path.join(iotests.test_dir, 'fifo')
> +
> +size   = 0x40000000 # 1G
> +sector_size = 512
> +granularity = 0x10000
> +regions = [
> +    { 'start': 0,          'count': 0x100000 },
> +    { 'start': 0x10000000, 'count': 0x20000  },
> +    { 'start': 0x39990000, 'count': 0x10000  }
> +    ]
> +
> +class TestDirtyBitmapMigration(iotests.QMPTestCase):
> +
> +    def setUp(self):
> +        os.mkfifo(fifo)
> +        qemu_img('create', '-f', iotests.imgfmt, disk_a, str(size))
> +        qemu_img('create', '-f', iotests.imgfmt, disk_b, str(size))
> +        self.vm_a = iotests.VM().add_drive(disk_a)
> +        self.vm_b = iotests.VM().add_drive(disk_b)
> +        self.vm_b.add_incoming_migration("exec: cat " + fifo)
> +        self.vm_a.launch()
> +        self.vm_b.launch()
> +
> +    def tearDown(self):
> +        self.vm_a.shutdown()
> +        self.vm_b.shutdown()
> +        os.remove(disk_a)
> +        os.remove(disk_b)
> +        os.remove(fifo)
> +
> +    def test_migration(self):
> +        result = self.vm_a.qmp('block-dirty-bitmap-add', node='drive0',
> +                               name='bitmap', granularity=granularity)
> +        self.assert_qmp(result, 'return', {});
> +
> +        for r in regions:
> +          self.vm_a.hmp_qemu_io('drive0',
> +                                'write %d %d' % (r['start'], r['count']))
> +
> +        result = self.vm_a.qmp('query-block');
> +        md5 = result['return'][0]['dirty-bitmaps'][0]['md5']
> +
> +        result = self.vm_a.qmp('migrate-set-capabilities',
> +                               capabilities=[{'capability': 'dirty-bitmaps',
> +                                              'state': True}])
> +        self.assert_qmp(result, 'return', {})
> +
> +        result = self.vm_a.qmp('migrate', uri='exec:cat>' + fifo)
> +        self.assertIsNotNone(self.vm_a.event_wait("STOP"))
> +        self.assertIsNotNone(self.vm_b.event_wait("RESUME"))

I recently got stung for this myself, but apparently certain versions we
target with QEMU don't have Python 2.7, which is when the
assertIsNotNone helper was introduced.

We can use e.g. assertNotEqual(self.vm_a.event_wait("STOP"), None) instead.

> +
> +        result = self.vm_b.qmp('query-block');
> +        self.assert_qmp(result, 'return[0]/dirty-bitmaps[0]/md5', md5);
> +
> +
> +if __name__ == '__main__':
> +    iotests.main()
> diff --git a/tests/qemu-iotests/117.out b/tests/qemu-iotests/117.out
> new file mode 100644
> index 0000000..ae1213e
> --- /dev/null
> +++ b/tests/qemu-iotests/117.out
> @@ -0,0 +1,5 @@
> +.
> +----------------------------------------------------------------------
> +Ran 1 tests
> +
> +OK
> diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
> index 6ca3466..6812681 100644
> --- a/tests/qemu-iotests/group
> +++ b/tests/qemu-iotests/group
> @@ -121,6 +121,7 @@
>  114 rw auto quick
>  115 rw auto
>  116 rw auto quick
> +117 rw auto quick
>  121 rw auto
>  122 rw auto
>  123 rw auto quick
> 

With that edit:

Reviewed-by: John Snow <jsnow@redhat.com>