US 2025/0147786 A1Published application

Flexible memory management for virtual machines

AssigneeGoogle Inc.

InventorsVaibhav Balwant Nagarnaik, Rahul Chaturvedi, Steven Aaron Richman

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Abstract

A virtual machine monitor (VMM) of a computing system may provide flexible memory management for guest virtual machines (guest VMs). The VMM may allocate a flexible amount of memory that is accessible to a guest VM. A guest VM may be configured, such as by VMM, to utilize a larger fixed amount of guest memory. A memory access error may be generated when guest VM accesses a memory location outside of the flexible memory. The VMM may receive the memory access error and allocate additional memory including at least the memory location to the flexible memory. The memory location may then be accessed without triggering a failure.

Claims20

Dependent claims

A method comprising:

allocating, by a virtual machine monitor executing at a host computing system, an amount of memory for a guest virtual machine, the amount of memory being less than a maximum amount of memory the guest virtual machine is configured to utilize, wherein the host computing system provides an execution environment for the guest virtual machine;
and
after starting a boot process of the guest virtual machine:
responsive to an attempt to access a memory location of the guest virtual machine that is unallocated, receiving, by the virtual machine monitor, a memory access error that includes an indication of the memory location that was attempted to be accessed;
responsive to receiving the memory access error, allocating, by the virtual machine monitor, additional memory for the guest virtual machine, wherein the additional memory includes the memory location;
and
accessing, by the virtual machine monitor, the memory location.

4 more elements

Dependencies are inferred from the claim text.