Updating a virtual machine monitor from a guest partition

• US 8,776,041 B2
• Filed: 02/05/2007
• Issued: 07/08/2014
• Est. Priority Date: 02/05/2007
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Kachroo, Naveen K., Taillefer, Martin, McMichael, Lonny Dean
• Primary Examiner(s): MITCHELL, JASON D
• Application Number:
  US11/702,785
• Publication Number:
  US 20080189697A1
• Time in Patent Office: 2,710 Days
• Field of Search: None
• US Class Current: 717/169
• CPC Class Codes: G06F 8/65 Updates security arrangements therefor G06F21/57
• CPC Class Codes: G06F 9/45533 Hypervisors; Virtual machine monitors

Abstract

Mechanisms are disclosed for updating a virtual machine monitor (“VMM”). Facilities of a guest operating system running in a guest virtual machine managed by the VMM are leveraged to facilitate receiving an update package. The update package may contain updates for guest operating systems extensions in addition to a VMM update. An updater process, running in a guest operating system, extracts the VMM update and transfers it down to the VMM. Upon successful transfer, the updater process applies any necessary updates to guest operating systems extensions and then signals the VMM to commit the transferred VMM update.

Claims

1. A method for updating a virtual machine monitor, the method comprising:

receiving update data using facilities of a guest operating system;

extracting by the guest operating system a first portion of the update data that is intended for the virtual machine monitor;

transferring the first portion of the update data to the virtual machine monitor;

receiving by the guest operating system a signal from the virtual machine monitor to indicate a successful result of validating the first portion of the update data;

extracting a second portion of the update data intended for the guest operating system;

applying the second portion of the update data to update the guest operating system in response to the signal indicating the successful result of validating by the virtual machine monitor the first portion of the update data intended for the virtual machine monitor; and

applying the first portion of the update data to update the virtual machine monitor.

2. A method as recited in claim 1, wherein receiving update data comprises receiving update data using a web browser application.

3. A method as recited in claim 1, wherein transferring the first portion of the update data comprises:

initiating an updater process on the guest operating system; and

communicating the first portion of the update data to the virtual machine monitor.

4. A method as recited in claim 3, wherein communicating the first portion of the update data to the virtual machine monitor comprises opening a communication channel between the guest operating system and the virtual machine monitor.

5. A method as recited in claim 3, wherein initiating the updater process comprises:

extracting instructions for the updater process from the received update data; and

launching the updater process on the guest operating system wherein the updater process executes at least some of the extracted instructions.

6. A method as recited in claim 1, wherein the applying of the first portion of the update data to update the virtual machine monitor and the applying of the second portion of the update data to update the guest operating system are coordinated.

7. A system comprising:

a physical processor;

a virtual machine monitor configured to execute on the physical processor; and

a guest operating system configured to execute under control of the virtual machine monitor; and

a virtual machine monitor updater configured to execute on the guest operating system to extract a first portion of update data intended for the virtual machine monitor, to transfer the first portion of the update data to the virtual machine monitor, to receive a signal from the virtual machine monitor to indicate a successful result of validating the first portion of the update data, to extract a second portion of the update data intended for the guest operating system and to apply the second portion of the update data to update the guest operating system in response to the signal indicating the successful result of validating by the virtual machine monitor the first portion of the update data intended for the virtual machine monitor.

8. A system as recited in claim 7, further comprising a browser application for receiving the update data.

9. A system as recited in claim 7, further comprising a communications interface configured to facilitate communication between the guest operating system and the virtual machine monitor.

10. A system as recited in claim 7, wherein the system comprises a game playing console comprising the physical processor.

11. A system as recited in claim 7 wherein the virtual machine monitor comprises an emulator for emulating an instruction set architecture that differs from the instruction set architecture of the processor.

12. A tangible computer readable storage medium, wherein the medium is not a signal, comprising computer executable instructions for managing an update to a virtual machine monitor, the computer executable instructions comprising instructions for:

receiving update data using facilities of a guest operating system;

extracting by the guest operating system a first portion of the update data that is intended for the virtual machine monitor;

transferring the first portion of the update data to the virtual machine monitor;

receiving by the guest operating system a signal from the virtual machine monitor to indicate a successful result of validating the first portion of the update data;

extracting a second portion of the update data intended for the guest operating system;

applying the second portion of the update data to update the guest operating system in response to the signal indicating the successful result of validating by the virtual machine monitor the first portion of the update data intended for the virtual machine monitor; and

applying the first portion of the update data to update the virtual machine monitor.

13. A tangible computer readable storage medium as in claim 12, wherein the computer executable instructions further comprise instructions for providing a communications channel between the guest operating system and the virtual machine monitor.

14. A tangible computer readable storage medium as in claim 13, wherein the applying of the first portion of the update data to update the virtual machine monitor and the applying of the second portion of the update data to update the guest operating system are coordinated.