Memory page tables sharing method and apparatus

A memory sharing method, used in a heterogeneous system, wherein the heterogeneous system comprises a host side and a first device side, and the method comprises:

• performing, by the host side, unified addressing on memory space of the heterogeneous system, to obtain a memory page table, wherein the memory page table comprises mapping from a virtual address to a physical address in the heterogeneous system;
• the first device side accesses a first virtual address in the heterogeneous system by querying, by a system memory management unit (SMMU) on the first device side, the memory page table based on the first virtual address, to obtain a first physical address, wherein the first physical address comprises a physical address on the host side;
• and
• accessing, by the first device side, a memory on the host side based on the first physical address,
• wherein the querying by SMMU on the first device side, the memory page table based on the first virtual address comprises:
• sending, by the SMMU on the first device side, the first virtual address to an agent SMMU on the first device side;
• querying, by the agent SMMU on the first device side, the memory page table, to obtain the first physical address;
• and
• sending, by the agent SMMU on the first device side, the physical first physical address to the SMMU of a first device via a dispatch module.

An electronic device, comprising a processor, wherein the processor is coupled to a storage, the processor is configured to store instructions, and when the instructions are executed by the processor, the electronic device is enabled to:

• establish, by a host side, a first memory page table, wherein the first memory page table comprises mapping from a virtual address on the host side to a physical address on the host side;
• establish, by a first device side, a second memory page table, wherein the second memory page table comprises mapping from a virtual address on the first device side to a physical address on the first device side, and the physical address on the host side and the physical address on the first device side are physical addresses obtained through unified addressing;
• and
• update, by an agent system memory management unit (SMMU) on the first device side, the second memory page table based on the first memory page table, and update, by the host side, the first memory page table based on the second memory page table.