Communication method, apparatus and system for virtual machine and host machine

A communication system for a virtual machine and a host machine, the system comprising:

• a host machine and at least one virtual machine deployed on the host machine, wherein:
• for the at least one virtual machine, the virtual machine is configured to:
• poll a first command completion identifier queue set in a shared memory;
• compare, in response to detecting an update of the first command completion identifier queue, the first command completion identifier queue with a second command completion identifier queue stored in the virtual machine to determine an identifier of a currently completed command;
• and
• update the second command completion identifier queue based on the identifier of the currently completed command.

A communication apparatus for a virtual machine and a host machine, the apparatus comprising:

• at least one processor;
• and
• a memory storing instructions, wherein the instructions when executed by the at least one processor, cause the at least one processor to perform operations, the operations comprising:
• polling a first command completion identifier queue set in a shared memory;
• comparing, in response to detecting an update of the first command completion identifier queue, the first command completion identifier queue with a second command completion identifier queue stored in the virtual machine to determine an identifier of a currently completed command;
• and
• updating the second command completion identifier queue based on the identifier of the currently completed command.

A non-transitory computer readable storage medium, storing a computer program thereon, the computer program, when executed by a processor of a host machine that has at least one virtual machine deployed thereon, causes the processor to perform actions, the actions including:

• polling a first command completion identifier queue set in a shared memory;
• comparing, in response to detecting an update of the first command completion identifier queue, the first command completion identifier queue with a second command completion identifier queue stored in the virtual machine to determine an identifier of a currently completed command;
• and
• updating the second command completion identifier queue based on the identifier of the currently completed command.