Determining virtual adapter access controls in a computing environment

A computer program product, comprising:

• a computer readable storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising:
• initiating, by a control component of a computing environment, sending of one or more requests over a network of the computing environment by an activated virtual adapter, the activated virtual adapter being hosted on a physical adapter of a host system coupled to the network, the activated virtual adapter for use by a guest, hosted by the host system, in performing data input and output, wherein the one or more requests retrieve access control information from the network, the access control information indicative of one or more access controls enforced by the network in controlling access by the activated virtual adapter to one or more network components of the network, and wherein the initiating comprises the control component providing one or more indications to the physical adapter, absent involvement of the guest, that the one or more requests be sent by the virtual adapter;
• based on the initiating, obtaining, by the control component, the access control information from the physical adapter;
• and
• determining, by the control component, based on the obtained access control information, the one or more access controls being enforced by the network in controlling access by the activated virtual adapter to the one or more network components.