Abstract: A method of address translation in a computing system providing direct memory access (DMA) by way of one or more remote memory management units (MMUs) is provided. The method comprises intercepting a request for a first DMA operation forwarded by a first device to a second device; and translating a guest address included in the request to a first address according to a mapping referencing a memory frame in a memory of the second device. A local MMU increments a first reference count indicating number of active DMA operations directed to the memory frame and a second reference count indicating number of remote MMUs that have mapped the memory frame.

Abstract: A computer implemented method for handling events in a multi-core processing environment is provided. The method comprises handling an event by a second application running on a second core, in response to determining that the event is initiated by a first application running on a first core; and running a third application on the first core, while the first application is waiting for the event to be handled by the second application.

Abstract: In accordance with one embodiment, a method of nesting a second virtual machine (VM) on a first VM running on a physical machine is provided. The method comprises receiving a first instruction from the physical machine, wherein the first instruction originates from the first VM, wherein a first control structure is associated with the first VM, and wherein a second control structure is associated with the second VM; creating a secondary control structure based on the second control structure associated with the second VM; providing the first instruction and the secondary control structure to the physical machine, wherein the physical machine executes the first instruction according to information included in the secondary control structure; and updating the secondary control structure to correspond to current state or execution environment of the physical machine.

Abstract: A method for managing memory in a nested virtualization environment is provided. The method comprises implementing a first virtual machine (VM) for a first software such that a first guest memory is allocated to the first software; maintaining a first data structure to translate one or more memory addresses in the first guest memory to corresponding memory addresses in a physical memory; maintaining a second data structure to translate one or more memory addresses in the second guest memory to corresponding memory addresses in the physical memory. The first software implements a second VM for a second software such that a second guest memory is allocated to the second software and maintains a third data structure to translate one or more memory addresses in the second guest memory to corresponding memory addresses in the first guest memory.

Abstract: A computer implemented method for handling events in a multi-core processing environment is provided. The method comprises handling an event by a second application running on a second core, in response to determining that the event is initiated by a first application running on a first core; and running a third application on the first core, while the first application is waiting for the event to be handled by the second application.

Abstract: A method for managing memory in a nested virtualization environment is provided. The method comprises implementing a first virtual machine (VM) for a first software such that a first guest memory is allocated to the first software; maintaining a first data structure to translate one or more memory addresses in the first guest memory to corresponding memory addresses in a physical memory; maintaining a second data structure to translate one or more memory addresses in the second guest memory to corresponding memory addresses in the physical memory. The first software implements a second VM for a second software such that a second guest memory is allocated to the second software and maintains a third data structure to translate one or more memory addresses in the second guest memory to corresponding memory addresses in the first guest memory.

Abstract: A method of address translation in a computing system providing direct memory access (DMA) by way of one or more remote memory management units (MMUs) is provided. The method comprises intercepting a request for a first DMA operation forwarded by a first device to a second device; and translating a guest address included in the request to a first address according to a mapping referencing a memory frame in a memory of the second device. A local MMU increments a first reference count indicating number of active DMA operations directed to the memory frame and a second reference count indicating number of remote MMUs that have mapped the memory frame.

Abstract: In accordance with one embodiment, a method of nesting a second virtual machine (VM) on a first VM running on a physical machine is provided. The method comprises receiving a first instruction from the physical machine, wherein the first instruction originates from the first VM, wherein a first control structure is associated with the first VM, and wherein a second control structure is associated with the second VM; creating a secondary control structure based on the second control structure associated with the second VM; providing the first instruction and the secondary control structure to the physical machine, wherein the physical machine executes the first instruction according to information included in the secondary control structure; and updating the secondary control structure to correspond to current state or execution environment of the physical machine.