The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 30, 2021
Filed:
Feb. 03, 2016
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
David A. Kaplan, Austin, TX (US);
Joel Howard Schopp, Austin, TX (US);
Advanced Micro Devices, Inc., Santa Clara, CA (US);
Abstract
Systems, apparatuses, and methods for implementing hypervisor post-write notification of processor state register modifications. A write to a state register of the processor may be detected during guest execution. In response to detecting the write to the state register, the processor may trigger microcode to perform the write and copy the new value of the register to a memory location prior to exiting the guest. The hypervisor may be notified of the update to the state register after it occurs, and the hypervisor may be prevented from modifying the value of the guest's state register. The hypervisor may terminate the guest if the update to the state register is unacceptable. Alternatively, the hypervisor may recommend an alternate value to the guest. If the guest agrees, the guest may set the state register to the alternate value recommended by the hypervisor when the guest resumes operation.