JPH0731609B2 - VM mode change device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a virtual computer system, and more particularly to a device for changing modes between different running modes by software instructions.

(Prior Art) Conventionally, in a virtual computer system, the VMCP has a function of forming a guest OS for control and a function of a normal OS. Therefore, it is useless to newly design the function as an ordinary OS and perform maintenance.

In addition, in the conventional virtual machine system, V
In order to shift to the MM mode, that is, to use the real computer system as the virtual computer system, the system had to be brought down and restarted.

(Problems to be Solved by the Invention) In the above-mentioned conventional virtual computer system, VMCP has a function of forming a guest OS and controlling it, and a function of a normal OS. When you are normal
It has the drawback of having to newly design and maintain the functions of the OS.

In addition, in the conventional virtual machine system, V
In order to shift to the MM mode, that is, to use the real computer system as the virtual computer system, there is a drawback that the system must be brought down and then restarted.

The object of the present invention is to provide NVM mode, VMM mode, and VMOS.
By newly setting the mode register that specifies the mode of the mode and the software instruction that changes the contents of the mode register, and by changing the contents of the mode register, the mode can be changed. If you want to effectively use the existing OS by substituting the functions of the host OS for the functions of the conventional OS that you had in the past, and change the mode from NVM mode to VMM mode, use a real computer. An object of the present invention is to provide a device that can be easily changed from a system that was operating as a system to a virtual computer system.

(Means for Solving Problems) A VM mode changing device according to the present invention includes a real CPU and a memory, and a VMCP that controls a plurality of guest OSs is run as a normal job that runs under the host OS. In a virtual machine system in which normal jobs run under the plurality of guest OSs running under the VMCP, an NVM mode in which software including jobs stored in the host OS runs, A mode register for designating a VMM mode in which the VMCP runs, and a VMOS mode in which software including a job stored in each of the plurality of guest OSs runs, and a mode value in the mode register from the memory A software instruction register for storing a software instruction for loading, and a load based on the software instruction in the software instruction register. It has been determined mode value of the mode register is configured by including a switching means for enabling a function of the real CPU required for the mode.

(Example) Next, this invention is demonstrated with reference to drawings.

FIG. 1 is an explanatory diagram showing an operation concept of a VM mode changing device according to the present invention.

In FIG. 1, 1 is a software instruction register, 2 is a memory, 3 is a mode register, 4 is a host OS area, 5
Is a VMCP area, and 6 is a guest OS area.

In FIG. 1, the memory 2 is accessed by the software instruction set in the software instruction register 1, and the accessed value is loaded into the mode register 3. The mode is determined by the loaded value. The job stored in the area 4 of the host OS runs in the NVM mode, the VMCP stored in the area 5 of the VMCP runs in the VMM mode, and the job stored in the area 6 of the guest OS runs in the VMOS mode.

FIG. 2 is a diagram showing a software configuration of a virtual computer system related to the present invention. In FIG. 2, 11 is a host OS, 12 is a VMCP, 13 to 15 are guest OSs, 16 is a job running under the host OS, and 17 is a job running under the guest OS.

In FIG. 2, there is a VMCP 12 dispatched by the host OS 11, which controls the guest OSs 13 to 15, respectively.

FIG. 3 is a block diagram showing an embodiment of the VM mode changing device according to the present invention. In FIG. 3, 21 is a software instruction register, 22 is a memory, 23 is a data register,
Reference numeral 24 is a mode register, 25 is a mode determination switching device, 26 is a real CPU, and 27 to 29 are OSs included in the real CPU 26.

In FIG. 3, the memory 22 is accessed by the software instruction set in the software instruction register 21, and the data is read from the memory 22 to the data register 23.
Next, the upper 2 bits of the contents of the data register 23 are loaded into the mode register 24. The 2-bit data loaded in the mode register 24 is used as the mode determination switching device 25.
It is determined by the NVM mode, VMM mode, or VMOS mode. In the NVM mode, a normal job runs under the host OS inside the real CPU 26. In the VMM mode, the VMCP 28 that forms and controls the guest OS inside the real CPU 26 runs, and in the VMOS mode, a normal job runs under the guest OS 29 inside the real CPU 26.

As described above, it is possible to dynamically switch modes.

(Effects of the Invention) As described above, according to the present invention, a mode register for designating a mode and a software instruction for changing the contents of the mode register are set and the contents of the mode register are changed. VM by allowing changes
The CP can be used with the function as an OS that can be shared with the host OS, and the program in the host OS is running (NVM mode) while VMCP is running (VMM
Mode), when the host OS dispatches VMCP and then VMCP changes the mode value to VMM, VMCP can use the function that the host OS has used.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an operation concept of a VM mode changing device according to the present invention. FIG. 2 is an explanatory diagram showing a software configuration example of the virtual computer system related to the present invention. FIG. 3 is a block diagram showing an embodiment of the VM mode changing device according to the present invention. 1,4 …… Software instruction register 2,22 …… Memory 3,24 …… Mode register 4 ～ 6 …… OS area 11,13 ～ 15,27 ～ 29 …… OS 12 …… VM monitor program 23 …… Data register 25 ...... Mode judgment switching device 26 …… Actual CPU ”(2) Amended Figures 1, 2 and 3 of the attached drawings to the attached Figures 1, 2 and 3 .

Claims (1)

[Claims] 1. A plurality of guest OSs including an actual CPU and a memory, running VMCP for controlling a plurality of guest OSs as a normal job running under a host OS, and running under the VMCP. In a virtual machine system in which a normal job runs under the following conditions, NVM mode in which software including a job stored in the host OS runs, VMM mode in which the VMCP runs, and the plurality of guest OSs A mode register for designating the VMOS mode in which the software including the jobs respectively stored therein is run, and software for storing a software instruction for loading a mode value from the memory into the mode register. The mode value of the instruction register and the mode register loaded based on the software instruction in the software instruction register is determined, and VM mode change apparatus characterized by being configured to include a switching means for enabling a function of the real CPU required over de.