发明授权
US07210144B2 Method for monitoring and emulating privileged instructions of programs in a virtual machine 有权
用于监视和仿真虚拟机中程序的特权指令的方法

Method for monitoring and emulating privileged instructions of programs in a virtual machine
摘要:
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.
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