Hypervisor direct memory access

US10503537B2 · kind B2 · utility

Assignee

• MICROSOFT TECHNOLOGY LICENSING, LLC · US

Inventors

• Aditya Bhandari · Seattle, US
• Bruce J. Sherwin, Jr. · Woodinville, US
• Xin David ZHANG · Duvall, US

Key dates

• Filing date: Jan 19, 2018
• Grant date: Dec 10, 2019
• Expiry date: Feb 8, 2038

Classification

• Technology area (CPC —): General

Abstract

This disclosure generally relates to hypervisor memory virtualization. Techniques disclosed herein improve peripheral component interconnect express (PCI-e) device interoperability with a virtual machine. As an example, when a direct-memory access request is received from a PCI-e device but the target memory is currently unmapped, an indication may be provided to a memory paging processor so as to page-in the memory, such that the PCI-e device may continue to function normally. In some examples, the access request may be buffered and replayed once the memory is paged-in, or the access request may be retried, among other examples.