公开(公告)号：US20230161613A1

公开(公告)日：2023-05-25

申请号：US17535458

申请日：2021-11-24

Applicant: Intel Corporation

Inventor： Jaishankar Rajendran ,  Jun Nakajima ,  Prashant Kodali ,  Karthik Varadarajan ,  Premanand Sakarda ,  Zhiyuan Lv ,  Vaibhav Shankar

IPC: G06F9/455

CPC classification number: G06F9/45558 ,  G06F9/45545

Abstract: Techniques and mechanisms for a host passthrough to be performed based on the execution of a hardware identification instruction with a virtual machine (VM). In an embodiment, a hypervisor process sets a value of a control parameter corresponding to a resource of the VM. The control parameter indicates whether the VM resource is authorized to avail of a host passthrough functionality of a processor which executes the hypervisor process. The control parameter is evaluated, based on a central processing unit identification (CPUID) instruction of a guest operating system which is executed with the VM, to determine whether the CPUID instruction is to result in a host passthrough or a VM exit. In another embodiment, a shared memory resource is searched to determine whether execution of the CPUID instruction is to retrieve information without the use of either the host passthrough or the VM exit.