| Patent application number | Description | Published |
|---|
| 20090037682 | HYPERVISOR-ENFORCED ISOLATION OF ENTITIES WITHIN A SINGLE LOGICAL PARTITION'S VIRTUAL ADDRESS SPACE - Access control to shared virtual address space within a single logical partition is provided. The access control includes: associating, by a hypervisor of the data processing system, a memory protection key with a portion of a single logical partition's virtual address space being shared by multiple entities, the key preventing access by one of the multiple entities to that portion of the virtual address space, and allowing access by another of the entities to that portion of the virtual address space; and locking by the hypervisor the memory protection key from modification by the one entity, wherein the locking prevents the one entity from modifying the key and thereby gaining access to the portion of the single logical partition's virtual address space with the associated memory protection key. In one embodiment, the one entity is the single logical partition itself, and the another entity is a partition adjunct. | 02-05-2009 |
| 20090037906 | PARTITION ADJUNCT FOR DATA PROCESSING SYSTEM - A partition adjunct is provided for a logical partition running above a hypervisor of a data processing system. The partition adjunct, which is a separate dispatchable partition from an instantiating logical partition, provides one or more services to the logical partition. A service request received from the logical partition is processed by the partition adjunct utilizing virtual address space donated to the partition adjunct from the logical partition. The partition adjunct and the logical partition share a common virtual address to real address page table, and context switching the current state machine from the logical partition to the partition adjunct occurs without invalidating or modifying state data of selected memory management and address translation hardware of the data processing system. In a hardware multithreaded system, the partition adjunct is dispatched on a single thread, while another thread continues to run in the logical partition initiating the service request. | 02-05-2009 |
| 20090037907 | CLIENT PARTITION SCHEDULING AND PRIORITIZATION OF SERVICE PARTITION WORK - A method in a data processing system is provided for processing a service request of a client partition. The method includes: obtaining by a service partition of the data processing system the service request from the client partition, wherein both the client and service partitions execute above a hypervisor of the data processing system; and processing the service request by the service partition utilizing a processor quantum assigned to the client partition and donated by the client partition to the service partition. The client partition controls scheduling of the service partition by queuing the service request at the client partition until the client partition decides to proceed with execution of the service request by the service partition. In one implementation, the service partition is a partition adjunct of the data processing system, which utilizes donated virtual address space of the client partition. | 02-05-2009 |
| 20090037908 | PARTITION ADJUNCT WITH NON-NATIVE DEVICE DRIVER FOR FACILITATING ACCESS TO A PHYSICAL INPUT/OUTPUT DEVICE - Dedicated access is provided to a physical input/output (I/O) device which is non-configurable by an initiating logical partition. Access is established by: initiating, by the logical partition, creation of a partition adjunct; invoking a hypervisor of the data processing system to instantiate the partition adjunct with resources donated from the initiating logical partition, the donated resources including a donated virtual address space of the logical partition and the physical I/O device; creating, by the hypervisor, the partition adjunct and assigning the donated virtual address space and donated physical I/O device to the created partition adjunct; and interfacing, by the hypervisor, the logical partition and the created partition adjunct, the interfacing including providing the logical partition with a virtual I/O device which replaces the donated physical I/O device, and which is configurable by the logical partition. | 02-05-2009 |
| 20090037941 | MULTIPLE PARTITION ADJUNCT INSTANCES INTERFACING MULTIPLE LOGICAL PARTITIONS TO A SELF-VIRTUALIZING INPUT/OUTPUT DEVICE - Multiple logical partitions are provided access to a self-virtualizing input/output device of a data processing system via multiple dedicated partition adjunct instances. Access is established by: interfacing each logical partition to one or more associated partition adjunct instances, each partition adjunct instance coupling its associated logical partition to one of a virtual function or a queue pair of the self-virtualizing input/output device, and each partition adjunct instance being a separate dispatchable state and being created employing virtual address space donated from the respective logical partition or a hypervisor of the data processing system, and each partition adjunct instance including a device driver for the virtual function or queue pair of the self-virtualizing input/output device; and providing each logical partition with at least one virtual input/output which is interfaced through the logical partition's respective partition adjunct instance(s) to a virtual function or queue pair of the self-virtualizing input/output device. | 02-05-2009 |
| 20110072426 | Speculative Notifications on Multi-core Platforms - A computer system having a plurality of processor cores utilizes a device driver running in a driver virtual machine to handle I/O with the corresponding device for other virtual machines. A hypervisor in the computer system receives an interrupt from the corresponding device and identifies a virtual machine that best correlates to the received interrupt prior to forwarding the interrupt for handling by the driver virtual machine. The hypervisor then speculatively transmits a notification to the identified virtual machine to wake up and poll a memory shared between the identified virtual machine and the driver virtual machine. Once the driver virtual machine completes handling of the forwarded interrupt, it copies data made available by the corresponding device to the shared memory for access by the polling identified virtual machine. | 03-24-2011 |
