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A Method To Establish And Treat Logical Function Device(s) Of A Multifunctional Chip As Protected Hypervisor Resource(s)

IP.com Disclosure Number: IPCOM000011933D
Original Publication Date: 2003-Mar-26
Included in the Prior Art Database: 2003-Mar-26
Document File: 1 page(s) / 39K

Publishing Venue

IBM

Abstract

Disclosed is a method to broaden the practice to provide a simple and effective solution for transforming a normal function resource into a protected function resource for a Logical Partitioning (LPAR) system.

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  A Method To Establish And Treat Logical Function Device(s) Of A Multifunctional Chip As Protected Hypervisor Resource(s)

A method, system, and apparatus has been established to move the functional control area of a multifunctional chip to a secure area of memory while the functions are remapped to the normal ranges expected by the operating system instance in the respective logical partition. However, there arises a situation in which a function must be removed so that the removed function can serve as a protected hypervisor of the LPAR system.

Employing this newly disclosed method, the Real Time Clock (RTC) function is removed and protected as a hypervisor resource in order to provide time-keeping for the LPAR system. This is accomplished by remapping the RTC address into a secured 4K-page address owned by the hypervisor instead of the address expected by the partition's operating system. Since the address of the RTC is in hypervisor space, the RTC becomes a protected hypervisor resource.

In fact, we can establish and treat any function of a multifunctional chip by the same method. For example, if the hypervisor want to reserve a serial port for its communication need, that serial port will be mapped to the same secured 4K-page as the RTC function being mapped into.

Disclosed by International Business Machines Corporation

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