Splitting direct memory access windows
US-2015058597-A1 · Feb 26, 2015 · US
Merging direct memory access windows
US9104600B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9104600-B2 |
| Application number | US-201313973621-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 22, 2013 |
| Priority date | Aug 22, 2013 |
| Publication date | Aug 11, 2015 |
| Grant date | Aug 11, 2015 |
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Abstract
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A computing device may merge two translation tables used when performing a DMA operation into a single, combined translation table. To merge the translation tables, the computing device may update a register in the IOMMU to include a pointer to the combined translation table. In addition, the IOMMU may clear one of the registers from having a pointer to one of the merged translation table. Doing so means the entries in this translation table are now no longer assigned. The IOMMU may update the register with the pointer to the combined translation table to include the unassigned entries in the combined translation table. In this manner, the entries from the two translation tables are merged into the single, combined table. The combined translation table may be owned or assigned to a service provider that originally owned one of the merged translation tables or to a completely different service provider.
First claim
Opening claim text (preview).
What is claimed is: 1. A computing system, comprising: a hypervisor configured to determine when to merge a first direct memory access (DMA) translation table assigned to a first service provider and a second DMA translation table assigned to a second service provider into a combined translation table, the combined translation table performing a virtual address to physical address translation for accessing data stored in respective DMA windows which define respective portions of m…
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- G06F12/1081Primary
Physics · mapped topic
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Frequently asked questions
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- What does patent US9104600B2 cover?
- A computing device may merge two translation tables used when performing a DMA operation into a single, combined translation table. To merge the translation tables, the computing device may update a register in the IOMMU to include a pointer to the combined translation table. In addition, the IOMMU may clear one of the registers from having a pointer to one of the merged translation table. Doin…
- Who is the assignee on this patent?
- IBM
- What technology area does this patent fall under?
- Primary CPC classification G06F12/1081. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Aug 11 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).