Red Hat Israel, Ltd.

Red Hat, Inc.

Ravello Systems Ltd.

Oracle International Corporation

Izik Eidus

Michael Tsirkin

Uri Lublin

Alexander Fishman

Leonid Shatz

Andrea Arcangeli

Michael Rapoport

Christopher M Wright

Dor Laor

A method and apparatus for efficiently executing guest programs in a virtualized computing environment are presented. The method includes executing a virtual machine on a computing hardware; executing a single hypervisor in a first security ring on the virtual machine; executing a single guest program on the virtual machine, wherein the single guest program includes a single kernel being executed in the first security ring and at least one application being executed in a second security ring; and executing at least an instruction issued by the at least one application without trapping the single hypervisor.

Apparatus and method thereof for efficient execution of a guest in a virtualized enviroment

A computerized method for efficient handling of a privileged instruction executed by a virtual machine (VM). The method comprises identifying when the privileged instruction causes a VM executed on a computing hardware to perform a VM exit; replacing a first virtual-to-physical address mapping to a second virtual-to-physical address mapping respective of a virtual pointer associated with the privileged instruction; and invalidating at least a cache entry in a cache memory allocated to the VM, thereby causing a new translation for the virtual pointer to the second virtual-to-physical address, wherein the second virtual-to-physical address provides a pointer to a physical address in a physical memory in the computing hardware allocated to the VM.

Method for reducing the overhead associated with a virtual machine exit when handling instructions related to descriptor tables

A mechanism for automatically encrypting and decrypting virtual disk content using a single user sign-on is disclosed. A method of embodiments of the invention includes receiving credentials of a user of a virtual machine (VM) provided as part of a single sign-on process to access the VM, referencing a configuration database with the received credentials of the user, determining encryption and decryption policy settings for the VM from the configuration database, and at least one of encrypting or decrypting, by the VM, files of the VM based on the determined encryption and decryption policy settings.

Encrypting and decrypting virtual disk content using a single user sign-on

Implementations provide for tracking memory accesses to optimize processor task placement is disclosed. A method includes creating a page table (PT) hierarchy associated with a thread, wherein the PT hierarchy comprises identifying information of memory pages and access bits corresponding to each of the memory pages, setting the respective access bit of one or more of the memory pages accessed by the thread while the thread is executing, collecting access bit information from the PT hierarchy associated with the thread, wherein the access bit information comprises the set access bits in the PT hierarchy, determining, in view of the collected access bit information, memory access statistics for the thread, and utilizing, during runtime of the thread, the memory access statistics for the thread in a determination of whether to migrate the thread to another processing device during the runtime of the thread.

Migrating threads across NUMA nodes using corresponding page tables and based on remote page access frequency

A method for efficient execution of a guest in a virtualized computing environment is provided. The method comprises causing an execution of at least one virtual machine on a computing hardware, the virtual machine executes a hypervisor in a first security ring; and causing an execution of a single guest program on one of the at least one virtual machines, the single guest program comprises a kernel being executed in the first security ring and at least one application being executed in a second security ring.

Apparatus and method thereof for efficient execution of a guest in a virtualized environment

A mechanism for touch screen emulation for a virtual machine is disclosed. A method of the invention includes providing an emulation of a touch screen device to a virtual machine (VM) managed by a hypervisor for emulation of the touch screen device by the VM, receiving touch gesture information related to a touch gesture received in the session window of the VM that is managed by the hypervisor, sending an interrupt to the VM that informs the VM of detected touch screen activity in the session window of the VM on the touch screen device, wherein in response to the interrupt the VM receives the touch gesture information in order to utilize in determining screen coordinates of the touch gestures within the session window of the VM.

Touch screen emulation for a virtual machine

A system and method for memory sharing among computer programs is disclosed. A method for memory sharing among computer programs includes identifying memory units of a plurality of memory units having identical contents, collapsing the identified memory units into a single merged memory page, and mapping the single merged memory page into an associated shared physical memory location. The method further includes when a request to write to a memory unit merged into the single merged memory page is received: copying, by a computer system, contents in the associated shared physical memory location to a different memory location, and redirecting, by the computer system, the request to the different memory location.

Memory sharing among computer programs

A mechanism for tracking memory accesses in a non-uniform memory access (NUMA) system to optimize processor task placement is disclosed. A method of embodiments of the invention includes creating a page table (PT) hierarchy associated with a thread to be run on a processor of a computing device, collecting access bit information from the PT hierarchy associated with the thread, wherein the access bit information includes any access bits in the PT hierarchy that are set by a memory management unit (MMU) of the processor to identify a page of memory accessed by the thread, determining memory access statistics for the thread, and utilizing the memory access statistics for the thread in a determination of whether to migrate the thread to another processor.

Migrating groups of threads across NUMA nodes based on remote page access frequency

A local system receives a graphics structure generated from an application hosted within the local system, where the application is accessed by a remote system. The graphics structure represents a display output from the application, where the graphics structure is generated in response to a change of display characteristics of the local system. A hash generator generates a first hash from the graphics structure according to a hash algorithm. It is determining whether there is an existing hash maintained by the local system that matches the first hash. The local system transmits the first hash to the remote system without sending the graphics structure if there is an existing hash matching the first hash. The first hash is used by the remote system to identify a graphics structure maintained by the remote system for rendering a display of the remote system.

Persisting graphics structures across resolution change in graphics remoting environment

A mechanism for dynamic placement of virtual machines (VMs) during live migration based on memory is disclosed. A method of embodiments of the invention includes determining candidate target host machines capable of receiving a VM to be migrated, obtaining a hash value for memory pages of the VM to be migrated, obtaining for each candidate target host machine hash values for shared memory pages utilized by one or more VMs hosted by the candidate target host machine, comparing for each candidate target host machine the hash values for the memory pages of the VM to be migrated with the hash values for the shared memory pages, and adjusting a score in a general selection algorithm for the candidate target host machine with the most identical matches of the hash values for the shared memory pages with the hash values for the memory pages of the VM to be migrated.

Mechanism for dynamic placement of virtual machines during live migration based on memory

A server receives one or more hashes from a client, where each of the hashes represents a graphics structure maintained by the client. A first hash is generated from a graphics structure according to a hash algorithm, where the graphics structure is generated from an application hosted within the server, where the graphics structure represents a display output of the application. It is determined whether there is an existing hash from the one or more hashes received from the client that matches the first hash. The first hash is transmitted to the client without sending the graphics structure if there is an existing hash matching the first hash. The first hash is used by the client to identify a graphics structure maintained by the client for rendering a display of the client.

Persisting graphics structures across client change in graphics remoting environment

A physical memory location among multiple programs is shared among multiple programs. In one embodiment, multiple memory units are scanned to detect duplicated contents in the memory units. The memory units are used by programs running on a computer system. A data structure is used to identify memory units of identical contents. To improve performance, an additional data structure can be used to identify memory units of identical contents. Memory units that are identified to have identical contents can share the same physical memory space.

Growing community of inventors

Kfar Saba, Israel

Izik Eidus