Simulated input/output devices

A system comprising:

• a processor:
• a memory storing computer executable instructions that when executed by the processor cause the processor to:
• retrieve, using a plurality of concurrent threads of execution, a plurality of host requests from a plurality of endpoint queues that correspond to communication endpoints;
• store the retrieved plurality of host requests in a first queue to form a reordered sequence of host requests;
• receive a sequence of controller requests from a simulated device that simulates a communication controller in accordance with a communication protocol;
• store the reordered sequence of host requests and the sequence of controller requests in a second queue, wherein the second queue merges the reordered sequence of host requests and the sequence of controller requests to form a merged sequence of requests;
• and
• perform commands represented by the merged sequence of requests in sequential order, wherein the commands access data that represents the state of the simulated device.

A system comprising:

• a simulation computer system including a simulated communication controller and simulated hardware model, and a remote simulator interface;
• and
• a host computer system including a remote daemon process that communicates with a simulated communication interface device driver that communicates with an operating system of the host computer,
• wherein the remote simulator interface sends output of the simulated communication controller via a network to the remote daemon process on the host computer system,
• the remote daemon process sends the output of the simulated communication controller to the device driver, and
• the device driver translates the output to transactions of a communication protocol and sends the transactions to the operating system of the host computer.

A system comprising:

• a processor configured to:
• receive, at a host machine, one or more transactions from a host operating system;
• translate the one or more transactions to commands using a virtual device driver that communicates with the host operating system and appears to the host operating system as a device driver;
• receive, at a remote daemon process, the commands;
• forward, using the remote daemon process, the commands to a remote interface server process;
• translate, using the remote interface server process, the commands to register read and write operations;
• execute a hardware simulator that simulates operation of a device, including a simulated controller and simulated registers;
• and
• perform the register read and write operations on the simulated registers in the simulated controller, wherein the read and write operations simulate the transactions from the host operating system.

A system comprising:

• a processor configured to:
• execute a hardware simulator that simulates operation of a device, including a simulated controller and simulated registers;
• receive one or more read and write operations at a remote interface server from a simulated controller, the read and write operations referencing the simulated registers;
• translate, at the remote interface server, the read and write operations to commands;
• send the commands from the remote interface server to a remote daemon process via network communication;
• receive the commands at the remote daemon process;
• send the commands from the remote daemon process to a virtual device driver that communicates with the a operating system;
• receive, using a simulator server process at a host machine, commands from a remote simulator interface;
• translate the commands received from the remote simulator interface to transactions;
• and
• provide the transactions to a host operating system via a device driver, wherein the host processes the transactions, and the transactions are based on the read and write operations generated by the simulated controller.