Virtualized NVRAM access methods to provide NVRAM CHRP regions for logical partitions through hypervisor system calls
US6567897B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 2001 |
| Grant date | May 20, 2003 |
| Priority date | — |
| Expiry date | May 11, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/1466
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method, system, and computer program product for enforcing logical partitioning of a shared device to which multiple partitions within a data processing system have access is provided. In one embodiment, a firmware portion of the data processing system receives a request from a requesting device, such as a processor assigned to one of a plurality of partitions within the data processing system, to access (i.e., read from or write to) a portion of the shared device, such as an NVRAM. The request includes a virtual address corresponding to the portion of the shared device for which access is desired. If the virtual address is within a range of addresses for which the requesting device is authorized to access, the firmware provides access to the requested portion of the shared device to the requesting device. If the virtual address is not within a range of addresses for which the requesting device is authorized to access, the firmware denies the request.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.