Undefeatable transformation for virtual machine I/O operations

Details Undefeatable transformation for virtual machine I/O operations Undefeatable transformation for virtual machine I/O operations

2007-08-21

2007-08-21

An, Meng-Al T. (Department: 2195)

Electrical computers and digital processing systems: virtual mac

Virtual machine task or process management

C713S187000, C713S188000, C713S189000, C709S203000, C711S006000

Reexamination Certificate

active

09844581

ABSTRACT:
I/O operations between a virtual machine (VM) and a device external to the VM are monitored by a virtual machine monitor (VMM). Data passing between the VM and the external device is transformed by the VMM, in some cases only when a predetermined filtering or triggering condition is met. Because the VMM, and thus the transformation operation, is transparent to the VM, the transformation cannot be prevented or undone or even affected by any action by a user of the VM. Examples of the non-defeatable transformation of I/O data include generating display overlays such as banners, masking out portions of a display, encryption, compression and network shaping such as bandwidth limiting.

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