Fair and efficient guest to hypervisor virtual machine socket protocol

A method, comprising:

• in response to a host determining to reject a message received from a guest that was previously accepted for processing by the host, transmitting a rejection to the guest;
• after transmitting the rejection and in response to determining that resources to handle the message previously rejected by the host have become available for the guest, transmitting an indication to the guest that the host is able to reaccept the message;
• and
• in response to receiving the message from the guest a second time, accepting the message in an execution queue in a virtual memory of the host on behalf of the guest.

A system, comprising:

• a processor;
• and
• a memory including instructions that when executed by the processor provide a host configured to manage resources in the system among a plurality of guests via operations including:
• in response to a host determining to reject a message received from a certain guest of the plurality of guests that was previously accepted by the host for processing, transmitting a rejection to the certain guest;
• in response to determining that resources to handle the message previously rejected by the host have become available for the certain guest, transmitting an indication to the certain guest that the host is able to reaccept the message;
• and
• in response to receiving the message from the certain guest a second time, accepting the message in an execution queue in a virtual memory of the host on behalf of the certain guest.