IOMMU-based direct memory access (DMA) tracking for enabling live migration of virtual machines (VMS) using passthrough physical devices
US12086084B2 · kind B2 · utility
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18Claims
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Key dates
| Filing date | Jan 18, 2022 |
| Grant date | Sep 10, 2024 |
| Priority date | — |
| Expiry date | Jan 18, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2009/45583
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Techniques for implementing IOMMU-based DMA tracking for enabling live migration of VMs that use passthrough physical devices are provided. In one set of embodiments, these techniques leverage an IOMMU feature known as dirty bit tracking which is available in most, if not all, modern IOMMU implementations. The use of this feature allows for the tracking of passthrough DMA in a manner that is device/vendor/driver agnostic, resulting in a solution that is universally applicable to all passthrough physical devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.