Retaining the non-volatile memory express cached data during virtual machine migration in a cloud setup

A computer implemented method for virtual machine migration, comprising:

• in a source computing system with a first virtual machine, caching a data storage device in the source computing system, using a non-volatile memory express protocol;
• identifying a target computing system for migration of the first virtual machine to a second virtual machine in the target computing system;
• providing a virtual persistent memory device to the first virtual machine;
• generating a persistent cache disk associated with the first virtual machine, wherein cache content in the persistent cache disk is generated using the non-volatile memory express protocol;
• migrating the cache content of the persistent cache disk that was generated using the non-volatile memory express protocol, to the virtual persistent memory device;
• and
• migrating a copy of the virtual persistent memory device to a copy of the persistent cache disk generated in a second virtual machine in the target computing system.

A source computing system, comprising:

• a processor operating a hypervisor and a first virtual machine;
• and
• a memory coupled to the processor, the memory storing instructions to cause the processor to perform acts comprising:
• caching a data storage device in the source computing system, using a non-volatile memory express protocol;
• identifying a target computing system for migration of the first virtual machine to a second virtual machine in the target computing system;
• providing a virtual persistent memory device to the first virtual machine;
• generating a persistent cache disk associated with the first virtual machine, wherein cache content in the persistent cache disk is generated using the non-volatile memory express protocol;
• migrating the cache content of the persistent cache disk that was generated using the non-volatile memory express protocol, to the virtual persistent memory device;
• and
• migrating a copy of the virtual persistent memory device to a copy of the persistent cache disk generated in a second virtual machine in the target computing system.