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iotests: Refactor blockdev-reopen test for iothreads 

We'll want to test more than one successful case in the future, so
prepare the test for that by a refactoring that runs each scenario in a
separate VM.

test_iothreads_switch_{backing,overlay} currently produce errors, but
these are cases that should actually work, by switching either the
backing file node or the overlay node to the AioContext of the other
node.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Tested-by: Peter Krempa <pkrempa@redhat.com>
Message-Id: <20200306141413.30705-2-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2020-03-06 15:14:12 +01:00
parent 19ae9ae014
commit 97518e11c3
2 changed files with 39 additions and 12 deletions
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47
tests/qemu-iotests/245
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@ -970,8 +970,7 @@ class TestBlockdevReopen(iotests.QMPTestCase):
self.assertEqual(self.get_node('hd1'), None)
self.assert_qmp(self.get_node('hd2'), 'ro', True)
# We don't allow setting a backing file that uses a different AioContext
def test_iothreads(self):
def run_test_iothreads(self, iothread_a, iothread_b, errmsg = None):
opts = hd_opts(0)
result = self.vm.qmp('blockdev-add', conv_keys = False, **opts)
self.assert_qmp(result, 'return', {})
@ -986,20 +985,48 @@ class TestBlockdevReopen(iotests.QMPTestCase):
result = self.vm.qmp('object-add', qom_type='iothread', id='iothread1')
self.assert_qmp(result, 'return', {})
result = self.vm.qmp('x-blockdev-set-iothread', node_name='hd0', iothread='iothread0')
result = self.vm.qmp('device_add', driver='virtio-scsi', id='scsi0',
iothread=iothread_a)
self.assert_qmp(result, 'return', {})
self.reopen(opts, {'backing': 'hd2'}, "Cannot use a new backing file with a different AioContext")
result = self.vm.qmp('x-blockdev-set-iothread', node_name='hd2', iothread='iothread1')
result = self.vm.qmp('device_add', driver='virtio-scsi', id='scsi1',
iothread=iothread_b)
self.assert_qmp(result, 'return', {})
self.reopen(opts, {'backing': 'hd2'}, "Cannot use a new backing file with a different AioContext")
if iothread_a:
result = self.vm.qmp('device_add', driver='scsi-hd', drive='hd0',
share_rw=True, bus="scsi0.0")
self.assert_qmp(result, 'return', {})
result = self.vm.qmp('x-blockdev-set-iothread', node_name='hd2', iothread='iothread0')
self.assert_qmp(result, 'return', {})
if iothread_b:
result = self.vm.qmp('device_add', driver='scsi-hd', drive='hd2',
share_rw=True, bus="scsi1.0")
self.assert_qmp(result, 'return', {})
self.reopen(opts, {'backing': 'hd2'})
# Attaching the backing file may or may not work
self.reopen(opts, {'backing': 'hd2'}, errmsg)
# But removing the backing file should always work
self.reopen(opts, {'backing': None})
self.vm.shutdown()
# We don't allow setting a backing file that uses a different AioContext if
# neither of them can switch to the other AioContext
def test_iothreads_error(self):
self.run_test_iothreads('iothread0', 'iothread1',
"Cannot use a new backing file with a different AioContext")
def test_iothreads_compatible_users(self):
self.run_test_iothreads('iothread0', 'iothread0')
def test_iothreads_switch_backing(self):
self.run_test_iothreads('iothread0', None,
"Cannot use a new backing file with a different AioContext")
def test_iothreads_switch_overlay(self):
self.run_test_iothreads(None, 'iothread0',
"Cannot use a new backing file with a different AioContext")
if __name__ == '__main__':
iotests.main(supported_fmts=["qcow2"],

4
tests/qemu-iotests/245.out
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@ -1,6 +1,6 @@
..................
.....................
----------------------------------------------------------------------
Ran 18 tests
Ran 21 tests
OK
{"execute": "job-finalize", "arguments": {"id": "commit0"}}