Abstract: The present invention provides a method for restoring a computer operation system comprising at least steps of: a) backing up information related to start up of the computer in an HPA of a hard disk; b) providing a self-checking module in the HPA of the hard disk, and additionally configuring a command for invoking the self-checking module in BIOS of the computer; c) invoking the self-checking module by the BIOS when the computer is booted from the hard disk, and determining by the self-checking module, whether the information related to start up of the computer is destroyed or not, if so, restoring the destroyed parts and then starting up the computer, and if not, directly starting up the computer.

Abstract: A virtual machine system supporting trusted computing includes a virtual machine monitor, a hardware and multiple operating systems (OSs). Said multiple OSs include at least a trusted OS, and at least a distrusted OS, a redirecting pipe is set in the virtual machine monitor, the redirecting pipe is adapted to redirect an I/O instruction from the distrusted OS to the trusted OS. Wherein, the trusted OS checks the trusted degree of a procedure information of the distrusted OS, and sends to the hardware an I/O instruction that corresponds to trusted procedure information confirmed via the trusted degree check, transferred via the redirecting pipe and came from the distrusted OS, performs an I/O operation by the hardware.

Abstract: The present invention provides a method for restoring a computer operation system comprising at least steps of: a) backing up information related to start up of the computer in an HPA of a hard disk; b) providing a self-checking module in the HPA of the hard disk, and additionally configuring a command for invoking the self-checking module in BIOS of the computer; c) invoking the self-checking module by the BIOS when the computer is booted from the hard disk, and determining by the self-checking module, whether the information related to start up of the computer is destroyed or not, if so, restoring the destroyed parts and then starting up the computer, and if not, directly starting up the computer.