Method and apparatus for managing memory

An apparatus for managing memory, comprising:

• at least one virtual machine memory management module, at least one virtual machine manager, a virtual PCIe device integrated in the virtual machine manager, and a host memory management module, wherein the virtual machine memory management module and the virtual machine manager both correspond to a virtual machine, wherein when the virtual machine is running, the virtual machine memory management module:
• receives a memory allocation request sent by a user process in the virtual machine;
• sends, according to the memory allocation request sent by the user process, the memory allocation request to the virtual PCIe device in the virtual machine manager to enable the virtual PCIe device to request memory from the host memory management module;
• and
• configures the memory space to the user process after acquiring, via the virtual PCIe device, the memory space allocated by the host memory management module.