Return a list of the VMs that in this location

def _list_nodes_full(location=None):
    '''
    Return a list of the VMs that in this location
    '''
    provider = __active_provider_name__ or 'ec2'
    if ':' in provider:
        comps = provider.split(':')
        provider = comps[0]

    params = {'Action': 'DescribeInstances'}
    instances = aws.query(params,
                          location=location,
                          provider=provider,
                          opts=__opts__,
                          sigver='4')
    if 'error' in instances:
        raise SaltCloudSystemExit(
            'An error occurred while listing nodes: {0}'.format(
                instances['error']['Errors']['Error']['Message']
            )
        )

    ret = _extract_instance_info(instances)

    __utils__['cloud.cache_node_list'](ret, provider, __opts__)
    return ret