JPH0212530A - Data processing system - Google Patents

Abstract

PURPOSE:To prevent overhead in the control of a control program from being increased even in an interruption processing by withdrawing a program state word to a second retracting area managed by the control of a guest OS (operating system), and starting up the guest OS by recovering the content of a first retracting area after performing the simulation of interruption. CONSTITUTION:When the interruption is generated in a guest OS mode, a processing procedure DP withdraws the program state word to the first retracting area M1 according to an interruption instruction when no interruption processing by the control of the guest OS is required, and withdraws the program state word to the second retracting area M2 when it is required. The content of the first retracting area M1 is recovered according to the execution start instruction of the guest OS after completing the simulation of the interruption by the control of a control program when no interruption processing is required, and the content of the second retracting area M2 is recovered when it is required. In such a way, it is possible to reduce the overhead of the processing due to the control of the control program, and to improve the performance of a virtual computer device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is applied to a data processing method of a virtual computer device. In particular, it relates to exception processing or interrupt processing that occurs during execution of the guest operating system (hereinafter referred to as guest O8) of the virtual machine device.

〔overview〕

In the data processing method of the present invention, when a fault or interrupt occurs in the guest OS mode, the cause of the fault or interrupt is the guest O8.
When fault processing or interrupt processing under the control of the control program is not required, the program state 1 is evacuated to the first save area managed under the control of the control program, and when necessary, it is managed under the control of the guest O8. The guest operating system is saved to the second save area, and after simulating an interrupt under the control of the control program, the contents of the first save area or the second save area are restored based on the 30MO3 instruction and the guest operating system is activated. Even when fault processing or interrupt processing is required, an increase in control overhead of the control program can be prevented.

[Conventional technology]

In general, virtual machine devices do not allow the Guess) O3 to execute all instructions, so when attempting to execute a special instruction such as an instruction that assumes input/output operations, a fault ( exception). Further, as in a real computing device, the hardware generates an interrupt when an input/output operation is completed, a memory access to an address other than the allowable address, a register overflow, a failure, etc. occurs. These faults and interrupts (hereinafter referred to as interrupts) are simulated under the control of a control program (hereinafter referred to as CP), and then control is returned to the guest O8.

Conventionally, in a data processing method of a virtual computer device, in such a case, the guest O8 first saves the state of the central processing unit at that time to a first save area managed by CP control, sets the mode to CP mode, The CP uses the data stored in the first save area to simulate interrupts, and if fault processing or interrupt processing by guest O8 control is required, the data saved in the first save area is saved to the guest O8. After moving the data to the second save area managed by control, it is stored in a register in the central processing unit, and if interrupt processing is not required, the data stored in the first save area is immediately processed by the central processing unit after the simulation. The information is stored in a register within the device, the mode is set to guest OS mode, and a software instruction is executed to activate the corresponding gate O8.

[Problem that the invention seeks to solve]

However, in such conventional data processing methods, when interrupt processing by guest O8 control is required, it is necessary to move the data stored in the first save area to the second save area, and this operation Since this method requires a large number of software instructions, there is a problem in that the overhead of CP control increases.

The present invention solves the above problems, and aims to provide a data processing method that can prevent an increase in the control overhead of a control program even when interrupt processing is required under the control of an operating system. purpose.

[Means for solving problems]

The present invention is directed to the
A main storage device including a backup area and a second backup area managed under the control of the guest operating system, and a data processing device including processing means for executing instructions of the host operating system, and the processing means includes a guest operating system. means for saving the program state word according to an interrupt instruction when an interrupt occurs during execution of the operating system; and means for saving the program state word according to the execution start instruction of the guest operating system after the simulation of the interrupt under the control of the control program is completed. In the data processing method, the saving means classifies the data into the first save area or the second save area based on whether interrupt processing under the control of the guest operating system is necessary. and means for adding information indicating whether interrupt processing under the control of the guest operating system is necessary to the execution start command, and the returning means based on this information. It is characterized by including means for restoring the contents of the first save area or the contents of the second save area to the data processing device.

[Effect]

(Guess) When an interrupt occurs in the OS mode, the processing means according to the interrupt instruction saves the program status word to the first save area when the interrupt processing by the guest O8 control is not necessary, and the interrupt processing by the guest O8 control is executed. When necessary, it is evacuated to the second evacuation area. After the simulation of an interrupt under control program control is completed, the contents of the first save area are restored when interrupt processing under guest O8 control is not necessary, and the contents of the second save area are restored when necessary, in accordance with the execution start command of guest O8. . The above operation can prevent an increase in the control overhead of the control program even when interrupt processing is required under the control of the guest operating system.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings. 1st
The figure is a block diagram of a data processing system according to an embodiment of the present invention. In FIG. 1, the data processing system includes a main memory MMU including a first save area M managed under the control of the CP and a second save area 2 managed under the control of the second save area 2, and a second save area 2 managed under the control of the host O3. A data processing device CPU including a processing means DP to execute the processing means DP, and the processing means DP
means for saving the program state word in accordance with an interrupt instruction when an interrupt occurs during execution of the above-mentioned guest O8; the data processing device CPU is in a guest OS mode or
It includes a mode register MR in which a mode is set, an instruction register IR in which an instruction is set, and an accessor IMA that accesses the main memory MMU.

Here, the feature of the present invention is that the evacuation means classifies and moves to the first evacuation area Ml or the second evacuation area M2 based on whether or not interrupt processing by the above-mentioned O3 control is necessary. and means for adding information to the execution start command indicating whether interrupt processing by the O3 control is necessary, and the restoring means is configured to restore the first save area Ml based on this information. or the contents of the second save area M2 in the data processing device CP tJ.

The operation of the data processing system having such a configuration will be explained. FIG. 2 is a flowchart showing the operation of the data processing system of the present invention.

FIG. 3 is a diagram showing the software environment of the data processing system of the present invention. FIG. 4 is a diagram showing the relationship between the guest operating system and control program of the data processing system of the present invention.

First, referring to FIG. 3, the software of this embodiment executes a CP or a job under the control of the host operating system (host O8), further executes a plurality of guests O8 under the control of the CP, and executes a guest operating system (host O8). ) It has a multi-level configuration that allows jobs to be executed after O3 control.

Next, referring to FIG. 1, the hardware of this embodiment is as follows:
The data processing device CPU includes a processing means DP1, a memory access means MA, an instruction register IR and a mode register MR, and the main memory device MMU has a first save area Ml and a second save area MMU. It has a retreat area M2.

The data processing device CPU includes a processing means DP, a memory access means MA, an instruction register IR and a mode register M.
The guest O8 or CP can be executed according to the OS mode or CP mode set in the mode register MR. In addition, in order to simplify the explanation, FIG. 1 illustrates a case where there is one data processing device CPU, but there may be a plurality of data processing devices CPU. However, if there are multiple data processing devices CPU, the first save area and the second save area are stored in the main storage MMU corresponding to each CPU.
It is necessary to provide

The first save area Ml and the second save area M2 are save areas for data indicating the state of the data processing device CPU, which is a program status word managed under the control of the CP and the controller O3, respectively, and are normally controlled by the memory access means MA. It is read and written in the same way as the data area. In addition, processing means D
P is a means for executing an instruction in the data processing device CPU, and is based on the mode setting set in the mode register MR and the instruction set in the instruction register IR, and also in a timely manner by the memory access means MA to execute the instruction in the main memory MM.
O3 or CP is executed while accessing U.

FIG. 4 is a diagram schematically showing the relationship between the guest O3 and the CP, and shows that when the above-mentioned interrupt occurs while the data processing device CPU is executing a job under the guest O8, , a simulation for this interrupt is performed in the data processing unit CPU, and then a start virtual machine operating system mode instruction (hereinafter SVM
It's called an O3 command. ) is executed.

The SVMO3 instruction is an instruction that instructs the virtual machine device to start executing O8. This instruction consists of an instruction code and a tag, and when control is transferred from the guest CP to O8, it immediately continues the previous job. Take over and execute, or
You can use a tag to specify whether to continue the previous job after executing the interrupt process.

Next, this embodiment will be described in detail with reference to FIGS. 1 and 2.

When the data processing device CPIJ is executing a job under O3 control (S l-33) and an interrupt occurs (S5), the processing means DP saves data indicating the state of the data processing device CPU. Evacuate to area. At this time, if the cause of the interrupt does not require interrupt processing (36), the data indicating the state of the data processing CPU is saved to the first save area M (S7), and If the data processing is required (S6), the data indicating the state of the data processing device CPU is saved to the second save area M2 (38).
.

Next, the data processing device CPU changes the setting contents of the mode register MR to the CP mode (S9), and then starts the CP (310). At this time, it is necessary to notify the CP whether the data indicating the state of the data processing device CPU has been saved to the first save area M+ or the second save area M2. Activate different program populations of the CP depending on what has been evacuated.

After CP simulates the interrupt,
), the S VMOS instruction consisting of steps 312 to S19 is executed. In the tag of the SVMO3 instruction, "0" is specified when data indicating the state of the data processing device CPU is saved to the first save area M, and rlj is specified in all other cases. .

For the svMos instruction, the processing means DP has a tag of “0”.
In this case, the data in the first save area M is loaded into the register of the data processing device CPU (S14), and the tag is set to "1".
In this case, the data in the second save area M2 is loaded into the 1/register of the data processing device CPU (318), and then the contents of the mode register MR are changed to the guest OS mode (S15.518).

At this time, if the tag of the SVMO3 instruction is "0", C
P starts the guest OS (517), data processing unit fcPU runs the job after O3 control (517), and data processing device fcPU runs the job (
S3). The job step at this time is the one following the job step when the interruption occurred in step S3, and the execution of the job is continued thereafter. Also, S
If the tag of the VMO3 instruction is “1”, step 319
After execution of , guest O8 interrupt processing is performed (S20).
, and then the process of step S3 is performed. If the job is finished (34), the execution of the guest O8 is finished.

〔Effect of the invention〕

As explained above, the present invention is advantageous in that even when interrupt processing under the control of the guest operating system is required, the overhead of processing under control of the control program can be reduced and the performance of the virtual machine device can be improved. It has a positive effect.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a data processing system according to an embodiment of the present invention. FIG. 2 is a flowchart showing the operation of the data processing system of the present invention. FIG. 3 is a diagram showing the software environment of the data processing system of the present invention. FIG. 4 is a diagram showing the relationship between the guest operating system and control program of the data processing system of the present invention. CPU...data processing device, DP...processing means, ■
R...Instruction register, Ml...First save area, M2
...Second save area, MA...Memory access means,
MMU: Main memory, MR: Mode register. Patent issue and false entry by NEC Co., Ltd. agent, patent attorney Takai Ide, F1 case example 1 Figure 1

Claims (1)

[Claims] 1. A main storage device including a first save area managed under the control of a control program and a second save area managed under the control of a guest operating system, and a process for executing instructions of the host operating system. a data processing device including means for saving a program state word according to an interrupt instruction when an interrupt occurs during execution of the guest operating system; and a data processing device for simulating the interrupt under control of the control program. and means for restoring the program state word in accordance with an execution start command of the guest operating system after completion, wherein the saving means is based on whether or not interrupt processing under control of the guest operating system is necessary. and means for adding information indicating whether or not interrupt processing under the control of the guest operating system is necessary to the execution start command. A data processing method, wherein the restoring means includes means for causing the data processing device to restore the contents of the first save area or the contents of the second save area based on the information.