указание VirtualizationType при запуске экземпляров aws ec2 с boto3

Кто-нибудь знает, как установить VirtualizationType при запуске экземпляра aws ec2 с помощью boto3? я пробовал с

session = boto3.session.Session(
            aws_access_key_id=self.access_key_id,
            aws_secret_access_key=self.secret_access_key,
            region_name=self.region)
ec2resource = session.resource('ec2')
ec2resource.create_instances(
            ImageId=ami_id, MinCount=1, MaxCount=count, KeyName=key_name,
            InstanceType=type, SecurityGroups=security_groups, 
            VirtualizationType='paravirtual')

но получил

[2016-01-15 10:54:18 CST] INFO Calling ec2:run_instances with {'VirtualizationType': 'paravirtual', 'KeyName': 'common', 'SecurityGroups': ['default'], 'MaxCount': 2, 'MinCount': 1, 'InstanceType': 'm1.small', 'ImageId': 'ami-d05e75b8'}
Traceback (most recent call last):
  File "suites/ec2.py", line 21, in <module>
    print ec2.launch(count=2, VirtualizationType='paravirtual')
  File "/Users/bchung/Dropbox/PycharmProjects/perf/lib/aws/ec2.py", line 183, in launch
    InstanceType=type, SecurityGroups=security_groups, **kwargs)
  File "/Library/Python/2.7/site-packages/boto3/resources/factory.py", line 455, in do_action
    response = action(self, *args, **kwargs)
  File "/Library/Python/2.7/site-packages/boto3/resources/action.py", line 79, in __call__
    response = getattr(parent.meta.client, operation_name)(**params)
  File "/Library/Python/2.7/site-packages/botocore/client.py", line 310, in _api_call
    return self._make_api_call(operation_name, kwargs)
  File "/Library/Python/2.7/site-packages/botocore/client.py", line 383, in _make_api_call
    api_params, operation_model, context=request_context)
  File "/Library/Python/2.7/site-packages/botocore/client.py", line 425, in _convert_to_request_dict
    api_params, operation_model)
  File "/Library/Python/2.7/site-packages/botocore/validate.py", line 273, in serialize_to_request
    raise ParamValidationError(report=report.generate_report())
botocore.exceptions.ParamValidationError: 
    Parameter validation failed:
    Unknown parameter in input: "VirtualizationType", must be one of: 
    DryRun, ImageId, MinCount, MaxCount, KeyName, SecurityGroups, 
    SecurityGroupIds, UserData, InstanceType, Placement, KernelId,
    RamdiskId, BlockDeviceMappings, Monitoring, SubnetId, 
    DisableApiTermination, InstanceInitiatedShutdownBehavior, 
    PrivateIpAddress, ClientToken, AdditionalInfo, NetworkInterfaces, 
    IamInstanceProfile, EbsOptimized

Мне нужно установить VirtualizationType, потому что мне понадобятся некоторые старые типы экземпляров (m1.small), которые допускают только паравиртуальный вместо hvm, и это кажется, boto3 по умолчанию использует hvm:

Traceback (most recent call last):
  File "suites/ec2.py", line 21, in <module>
    print ec2.launch(count=2)
  File "/Users/bchung/Dropbox/PycharmProjects/perf/lib/aws/ec2.py", line 183, in launch
    InstanceType=type, SecurityGroups=security_groups, **kwargs)
  File "/Library/Python/2.7/site-packages/boto3/resources/factory.py", line 455, in do_action
    response = action(self, *args, **kwargs)
  File "/Library/Python/2.7/site-packages/boto3/resources/action.py", line 79, in __call__
    response = getattr(parent.meta.client, operation_name)(**params)
  File "/Library/Python/2.7/site-packages/botocore/client.py", line 310, in _api_call
    return self._make_api_call(operation_name, kwargs)
  File "/Library/Python/2.7/site-packages/botocore/client.py", line 396, in _make_api_call
    raise ClientError(parsed_response, operation_name)
botocore.exceptions.ClientError: An error occurred 
(InvalidParameterCombination) when calling the RunInstances operation:
 Non-Windows instances with a virtualization type of 'hvm' are currently not supported for this instance type.

Я проверил: http://boto3.readthedocs.org/en/latest/reference/services/ec2.html#EC2.ServiceResource.create_instances и http://boto3.readthedocs.org/en/latest/reference/services/ec2.html.#EC2.Client.run_instances

и в параметрах нет VirtualizationType, поэтому мне интересно, есть ли способ установить или, поскольку он будет устаревшим, поэтому boto3 просто не позволяет указать это?

Любые подсказки или предложения приветствуются, и спасибо заранее!