Vmware, Inc.

Gerald A Fry

Scott W Devine

Lawrence S Rogel

Prashanth P Bungale

In a computing system having virtualization software including a guest operating system (OS), a method for executing guest OS instructions that includes: replacing each of one or more guest OS instructions with: (a) a translated instruction, which translated instruction is a one-to-one translation, or (b) a trap instruction.

Virtualization with in-place translation

A computing system includes virtualization software including a guest operating system (OS). A method maintains, by the virtualization software layer, a first shadow page table for use in a kernel mode and a second shadow page table for use in a user mode. The virtualization software switches between using the first shadow page table and the second shadow page table when the guest OS switches between operating in the kernel mode and the user mode.

Virtualization with multiple shadow page tables

One or more embodiments provides a shadow page table used by a virtualization software wherein at least a portion of the shadow page table shares computer memory with a guest page table used by a guest operating system (OS) and wherein the virtualization software provides a mapping of guest OS physical pages to machine pages.

Virtualization with shadow page tables

In a computing system having virtualization software including a guest operating system (OS), a method for operating wherein virtualization software address space is distributed in guest OS address space that includes: granting the guest OS execute, but not read or write, access, to pages in the virtualization software address space.

Virtual machine execution using virtualization software with shadow page tables and address space interspersed among guest operating system address space

In a computing system having virtualization software including a guest operating system (OS), a method for providing page tables that includes: providing a guest page table used by the guest OS and a shadow page table and a shadow page directory used by the virtualization software wherein: at least a portion of the guest page table and the shadow page directory are the same; and the portions that are the same are shared in computer memory by the guest page table and the shadow page directory.

Virtualization with merged guest page table and shadow page directory

In a computing system having virtualization software including a guest operating system (OS), a method for providing page tables that includes: providing a guest page table used by the guest OS and a shadow page table used by the virtualization software wherein at least a portion of the guest page table and the shadow page table share computer memory.

In-place shadow tables for virtualization

In a computing system having virtualization software including a guest operating system (OS), a method for providing page tables that includes: providing a guest page table used by the guest OS and a shadow page table used by the virtualization software wherein at least a portion of the guest page table and the shadow page table share computer memory; wherein: machine pages have a predetermined size; and the virtualization software maps guest OS physical pages to machine pages at a predetermined alignment.

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Brighton, MA, United States of America

Gerald A Fry