Dynamic address translation for a virtual machine

A computer system comprising:

• at least one processor;
• an assist controller;
• and
• a memory coupled to the at least one processor and the assist controller;
• wherein a set of computer program instructions are stored in the memory and executed by the at least one processor and the assist controller, in order to perform actions of:
• allocating a memory space for at least one guest operation system, by the at least one processor;
• in response to a request for building a shadow dynamic address translation table, obtaining a memory portion from the memory space by the assist controller, wherein the shadow dynamic address translation table includes a mapping between at least one guest logic memory address and at least one host physical memory address;
• building the shadow dynamic address translation table, by the assist controller, wherein building the shadow dynamic address translation table comprises:
• obtaining a guest logical memory address to be translated from the request of building the shadow dynamic address translation table;
• obtaining a guest dynamic address translation table including one or more mappings between one or more guest logical memory addresses and one or more guest physical memory addresses, from a guest operation system;
• searching the guest dynamic address translation table with the guest logical memory address to obtain a guest physical memory address;
• obtaining a host logical memory address based on the guest physical memory address;
• obtaining a host dynamic address translation table including one or more mappings between one or more host logical memory addresses and one or more host physical memory addresses, from a host operation system;
• searching the host dynamic address translation table with the host logical memory address to obtain a host physical memory address;
• and
• saving a mapping, between the guest logical memory address and the host physical memory address, to the shadow dynamic address translation table;
• and
• storing the shadow dynamic address translation table in the memory portion, by the assist controller.

A computer program product, comprising a computer readable storage medium having program instructions embodied therewith, wherein the computer readable storage medium is not a transitory signal per se;

• and
• wherein the program instructions are executable by an assist controller to perform a method comprising:
• in response to a request for building a shadow dynamic address translation table, obtaining a memory portion from a memory space, wherein the memory space is allocated for at least one guest operation system, and wherein the shadow dynamic address translation table includes a mapping between at least one guest logic memory address and at least one host physical memory address;
• building the shadow dynamic address translation table, wherein building the shadow dynamic address translation table comprises:
• obtaining a guest logical memory address to be translated from the request of building the shadow dynamic address translation table;
• obtaining a guest dynamic address translation table including one or more mappings between one or more guest logical memory addresses and one or more guest physical memory addresses, from a guest operation system;
• searching the guest dynamic address translation table with the guest logical memory address to obtain a guest physical memory address;
• obtaining a host logical memory address based on the guest physical memory address;
• obtaining a host dynamic address translation table including one or more mappings between one or more host logical memory addresses and one or more host physical memory addresses, from a host operation system;
• searching the host dynamic address translation table with the host logical memory address to obtain a host physical memory address;
• and
• saving a mapping, between the guest logical memory address and the host physical memory address, to the shadow dynamic address translation table;
• and
• storing the shadow dynamic address translation table in the memory portion.