Patents by Inventor Andrei Warkentin

Andrei Warkentin has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • HYPERVISOR CONTEXT SWITCHING USING A TRAMPOLINE SCHEME IN PROCESSORS HAVING MORE THAN TWO HIERARCHICAL PRIVILEGE LEVELS
    Publication number: 20150370590
    Abstract: In a virtualized computer system operable in more than two hierarchical privilege levels, components of a hypervisor, which include a virtual machine kernel and virtual machine monitors (VMMs), are assigned to different privilege levels. The virtual machine kernel operates at a low privilege level to be able to exploit certain features provided by the low privilege level, and the VMMs operate at a high privilege level to support execution of virtual machines. Upon determining that a context switch from the virtual machine kernel to a VMM is to be performed, the computer system exits the low privilege level, and enters the high privilege level to execute a trampoline that supports context switches to VMMs, such as state changes, and then the VMM. The trampoline is deactivated after execution control is switched to the VMM.
    Type: Application
    Filed: June 23, 2014
    Publication date: December 24, 2015
    Inventors: Harvey TUCH, Andrei WARKENTIN
  • HYPERVISOR CONTEXT SWITCHING USING A REDIRECTION EXCEPTION VECTOR IN PROCESSORS HAVING MORE THAN TWO HIERARCHICAL PRIVILEGE LEVELS
    Publication number: 20150370591
    Abstract: In a virtualized computer system operable in more than two hierarchical privilege levels, components of a hypervisor, which include a virtual machine kernel and virtual machine monitors (VMMs), are assigned to different privilege levels. The virtual machine kernel operates at a low privilege level to be able to exploit certain features provided by the low privilege level, and the VMMs operate at a high privilege level to support execution of virtual machines. Upon determining that a context switch from the virtual machine kernel to a VMM is to be performed, the computer system exits the low privilege level, and enters the high privilege level to execute a trampoline that supports context switches to VMMs, such as state changes, and then the VMM. The trampoline is deactivated after execution control is switched to the VMM.
    Type: Application
    Filed: June 23, 2014
    Publication date: December 24, 2015
    Inventors: Harvey TUCH, Andrei WARKENTIN
  • HYPERVISOR CONTEXT SWITCHING USING TLB TAGS IN PROCESSORS HAVING MORE THAN TWO HIERARCHICAL PRIVILEGE LEVELS
    Publication number: 20150370592
    Abstract: In a virtualized computer system operable in more than two hierarchical privilege levels, components of a hypervisor, which include a virtual machine kernel and virtual machine monitors (VMMs), are assigned to different privilege levels. The virtual machine kernel operates at a low privilege level to be able to exploit certain features provided by the low privilege level, and the VMMs operate at a high privilege level to support execution of virtual machines. Upon determining that a context switch from the virtual machine kernel to a VMM is to be performed, the computer system exits the low privilege level, and enters the high privilege level to execute a trampoline that supports context switches to VMMs, such as state changes, and then the VMM. The trampoline is deactivated after execution control is switched to the VMM.
    Type: Application
    Filed: June 23, 2014
    Publication date: December 24, 2015
    Inventors: Harvey TUCH, Andrei WARKENTIN
  • INTELLIGENT BOOT DEVICE SELECTION AND RECOVERY
    Publication number: 20140325202
    Abstract: Techniques for recovering virtual machine state and boot information used to boot an installed guest operating system on systems where the information has either been lost or is not present are described.
    Type: Application
    Filed: July 7, 2014
    Publication date: October 30, 2014
    Inventors: Andrei Warkentin, Jacob Oshins
  • Intelligent boot device selection and recovery
    Patent number: 8775781
    Abstract: Techniques for recovering virtual machine state and boot information used to boot an installed guest operating system on systems where the information has either been lost or is not present are described.
    Type: Grant
    Filed: March 25, 2010
    Date of Patent: July 8, 2014
    Assignee: Microsoft Corporation
    Inventors: Andrei Warkentin, Jacob Oshins
  • Virtual machine fast emulation assist
    Patent number: 8612633
    Abstract: Techniques for reducing virtual machine input/output emulation overhead and decreasing the attack surface of a virtual machine architecture are disclosed.
    Type: Grant
    Filed: March 31, 2010
    Date of Patent: December 17, 2013
    Assignee: Microsoft Corporation
    Inventors: Lawrence R. Cleeton, Andrei Warkentin, Andrew Nicholas, Rene Antonio Vega, Jacob Oshins, John A. Starks
  • Virtual Machine Fast Emulation Assist
    Publication number: 20110246171
    Abstract: Techniques for reducing virtual machine input/output emulation overhead and decreasing the attack surface of a virtual machine architecture are disclosed.
    Type: Application
    Filed: March 31, 2010
    Publication date: October 6, 2011
    Applicant: Microsoft Corporation
    Inventors: Lawrence R. Cleeton, Andrei Warkentin, Andrew Nicholas, Rene Antonio Vega, Jacob Oshins, John A. Starks
  • INTELLIGENT BOOT DEVICE SELECTION AND RECOVERY
    Publication number: 20110238969
    Abstract: Techniques for recovering virtual machine state and boot information used to boot an installed guest operating system on systems where the information has either been lost or is not present are described.
    Type: Application
    Filed: March 25, 2010
    Publication date: September 29, 2011
    Applicant: Microsoft Corporation
    Inventors: Andrei Warkentin, Jacob Oshins