Invention Grant
- Patent Title: Reverse shadow page tables for nested virtual machines
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Application No.: US17947450Application Date: 2022-09-19
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Publication No.: US12159157B2Publication Date: 2024-12-03
- Inventor: Michael Tsirkin , Andrea Arcangeli
- Applicant: Red Hat, Inc.
- Applicant Address: US NC Raleigh
- Assignee: Red Hat, Inc.
- Current Assignee: Red Hat, Inc.
- Current Assignee Address: US NC Raleigh
- Agency: Dority & Manning, P.A.
- Main IPC: G06F9/455
- IPC: G06F9/455 ; G06F12/1009 ; G06F12/14

Abstract:
Systems and methods for memory management for virtual machines. An example method may comprise running, by a host computer system, a Level 0 hypervisor managing a Level 1 virtual machine running a Level 1 hypervisor which manages a Level 2 virtual machine. The Level 1 hypervisor may detecting execution of an operation that prevents modification to a set of entries in a Level 2 page table and generate a shadow page table where each shadow page table entry of the plurality of shadow page table entries maps a Level 2 guest virtual address of a Level 2 address space associated with the Level 2 virtual machine to a corresponding Level 1 guest physical address of a Level 1 address space associated with the Level 1 virtual machine. The Level 0 hypervisor may generate a Level 0 page table.
Public/Granted literature
- US20230018412A1 REVERSE SHADOW PAGE TABLES FOR NESTED VIRTUAL MACHINES Public/Granted day:2023-01-19
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