Method for monitoring and emulating privileged instructions of programs in a virtual machine
US7210144B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 2, 2002 |
| Grant date | Apr 24, 2007 |
| Priority date | — |
| Expiry date | Mar 30, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2201/88
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for monitoring and emulating privileged instructions of a program that is being executed at a privilege level in a virtual machine is disclosed. A privilege level associated with a received instruction is determined. The instruction privilege level is compared to the program execution privilege level. If the instruction privilege level is valid with respect to the program execution privilege level, the instruction is executed. If the instruction privilege level is invalid with respect to the program execution privilege level: the instruction result is emulated; the number of times the instruction has been received from the program is checked; and if the instruction has been received more than a specified number of times, the instruction is overwritten with one or more instructions with a valid privilege level with respect to the program execution privilege level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.