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-rw-r--r--tests/qemu-iotests/iotests.py9
1 files changed, 6 insertions, 3 deletions
diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 557925314b..1f913a1b2c 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -118,13 +118,16 @@ class VM(object):
self._args.append('-monitor')
self._args.append(args)
- def add_drive(self, path, opts=''):
+ def add_drive(self, path, opts='', interface='virtio'):
'''Add a virtio-blk drive to the VM'''
- options = ['if=virtio',
+ options = ['if=%s' % interface,
'format=%s' % imgfmt,
'cache=%s' % cachemode,
- 'file=%s' % path,
'id=drive%d' % self._num_drives]
+
+ if path is not None:
+ options.append('file=%s' % path)
+
if opts:
options.append(opts)