Direct I/O device access by a virtual machine with memory...

Details Direct I/O device access by a virtual machine with memory... Direct I/O device access by a virtual machine with memory...

2010-04-29

2011-12-27

Lee, Chun-Kuan (Department: 2181)

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

C710S001000, C710S002000, C710S003000, C710S004000, C710S005000, C710S006000, C710S007000, C710S008000, C710S009000, C710S010000, C710S011000, C710S012000, C710S013000, C710S014000, C710S015000, C710S016000, C710S017000, C710S018000, C710S019000, C710S020000, C710S021000, C710S023000, C710S036000, C710S056000, C710S058000, C710S065000, C710S308000

Reexamination Certificate

active

08086765

ABSTRACT:
Illustrated is a system and method for identifying a memory page that is accessible via a common physical address, the common physical address simultaneously accessed by a hypervisor remapping the physical address to a machine address, and the physical address used as part of a DMA operation generated by an I/O device that is programmed by a VM. It also includes transmitting data associated with the memory page as part of a memory disaggregation regime, the memory disaggregation regime to include an allocation of an additional memory page, on a remote memory device, to which the data will be written. It further includes updating a P2M translation table associated with the hypervisor, and an IOMMU translation table associated with the I/O device, to reflect a mapping from the physical address to a machine address associated with the remote memory device and used to identify the additional memory page.

REFERENCES:
patent: 7996569 (2011-08-01), Aloni et al.
patent: 2005/0246453 (2005-11-01), Erlingsson et al.
patent: 2007/0162572 (2007-07-01), Aloni et al.
patent: 2007/0162619 (2007-07-01), Aloni et al.
patent: 2007/0244972 (2007-10-01), Fan
patent: 2008/0133709 (2008-06-01), Aloni et al.

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