Method for migrating memory data of virtual machine, and related apparatus and cluster system

A physical host, comprising:

• a memory that stores instructions;
• and
• a processor coupled to the memory and configured to execute the instructions to:
• obtain a data sending request for sending memory data of a first virtual machine, wherein the data sending request comprises an identity of the first virtual machine and a physical frame number PFN of the memory data that is requested to be sent,
• query a correspondence information base according to the identity of the first virtual machine to obtain a correspondence of the first virtual machine, wherein the correspondence information base comprises a correspondence of a virtual machine to be migrated, and the correspondence of the virtual machine is a correspondence established between a PFN of memory of the virtual machine and a physical memory page address of the memory of the virtual machine after an address space of the memory of the virtual machine, the PFN of the memory of the virtual machine corresponding to the address space, and the physical memory page address of the memory of the virtual machine corresponding to the PFN of the memory of the virtual machine are obtained based on an identity of the virtual machine,
• query the correspondence of the first virtual machine according to the PFN of the memory data that is requested to be sent, so as to obtain a physical memory page address of the memory data that is requested to be sent, and
• send, to a destination physical host by using a remote direct memory access (RDMA) network adapter, memory data stored at the physical memory page address of the memory data that is requested to be sent.

A physical host, comprising a hardware layer, a host running on the hardware layer, and at least one virtual machine (VM) running on the host, wherein the hardware layer comprises a remote direct memory access RDMA network adapter, the at least one virtual machine comprises a first virtual machine, and the host is configured to:

• obtain a data sending request for sending memory data of the first virtual machine, wherein the data sending request comprises an identity of the first virtual machine and a physical frame number PFN of the memory data that is requested to be sent;
• query a correspondence information base according to the identity of the first virtual machine to obtain a correspondence of the first virtual machine, wherein the correspondence information base comprises a correspondence of a virtual machine to be migrated, and the correspondence of the virtual machine is a correspondence established between a PFN of memory of the virtual machine and a physical memory page address of the memory of the virtual machine after an address space of the memory of the virtual machine, the PFN of the memory of the virtual machine corresponding to the address space, and the physical memory page address of the memory of the virtual machine corresponding to the PFN of the memory of the virtual machine are obtained based on an identity of the virtual machine;
• query the correspondence of the first virtual machine according to the PFN of the memory data that is requested to be sent, so as to obtain a physical memory page address of the memory data that is requested to be sent;
• and
• send, to a destination physical host by using the remote direct memory access RDMA network adapter, memory data stored at the physical memory page address of the memory data that is requested to be sent.

A cluster system, comprising a plurality of physical hosts, wherein the plurality of physical hosts comprise a source physical host and a destination physical host, and wherein the source physical host comprises:

• an RDMA network adapter;
• a memory that stores instructions;
• and
• a processor coupled to the memory and configured to execute the instructions to:
• obtain a data sending request for sending memory data of a first virtual machine, wherein the data sending request comprises an identity of the first virtual machine and a physical frame number PFN of the memory data that is requested to be sent;
• query a correspondence information base according to the identity of the first virtual machine to obtain a correspondence of the first virtual machine, wherein the correspondence information base comprises a correspondence of a virtual machine to be migrated, and the correspondence of the virtual machine is a correspondence established between a PFN of memory of the virtual machine and a physical memory page address of the memory of the virtual machine after an address space of the memory of the virtual machine, the PFN of the memory of the virtual machine corresponding to the address space, and the physical memory page address of the memory of the virtual machine corresponding to the PFN of the memory of the virtual machine are obtained based on an identity of the virtual machine;
• query the correspondence of the first virtual machine according to the PFN of the memory data that is requested to be sent, so as to obtain a physical memory page address of the memory data that is requested to be sent;
• and
• send, to a destination physical host by using a remote direct memory access (RDMA) network adapter, memory data stored at the physical memory page address of the memory data that is requested to be sent.