JPS61245244A - Information system for input and output interruption of virtual computer system - Google Patents

Abstract

PURPOSE:To reduce the overhead of control program processing by holding an interruption request given from an input/output device and informing the held interruption request to an operating system which is under execution. CONSTITUTION:Interruption information is set to the 1st interruption holding area 11 before the input/output interruption is delivered from an input/output device 20. Then a control program CP is started in response to the input/output interruption, and an interruption acceptable state of an operating system is decided. Then an interruption processing program of the operating system is started for the accepted interruption. If the acceptance of the interruption is impossible, the input/output interruption information is held until the acceptable is possible. Thus the interruption information given from the 1st interruption holding area 11 is set to the 2nd interruption holding area 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a virtual computer system applied to a data processing system, in which an interrupt request from an input/output device is suspended and suspended by a running operating system. This invention relates to a method for notifying an interrupt request.

[Prior art]

In computer systems, there is a virtual computer system as a technology that has recently been put into practical use.

This virtual computer system is useful for running multiple operating systems simultaneously on one computer system. With this feature, the virtual computer system can simultaneously evaluate multiple operating systems and easily migrate operating systems.

When a plurality of operating systems (abbreviated as OS) are executed on a computer system (OS), special processing is required to respond to interrupt requests from input/output devices. For example, an input/output interrupt request accepted while one operating system is running may be an interrupt request directed to another operating system.

Therefore, all interrupt requests from input/output devices.

Once, the control program (abbreviated as cp) is notified. Therefore, it is necessary for the control program to determine which operating system the interrupt request is for and start the interrupt processing program of the corresponding operating system, but at that point, the corresponding operating system is in a state where it cannot accept interrupts. There may be. In such a case, in the conventional technology, the control program suspends the interrupt information, and when it becomes possible to accept interrupts while the operating system is running, the control program is started, and the control program starts the interrupt program of the operating system. was.

However, according to this method, the processing of the control program is executed when it becomes possible to accept one interrupt, so there is a drawback that the overhead of the processing of the control program increases.

[Purpose of the invention]

An object of the present invention is to, in a virtual computer system, when interrupt acceptance becomes possible while an operating system is running, without transferring control to a control program.
An object of the present invention is to provide an input/output interrupt notification method that allows an operating system to directly process pending input/output interrupt requests.

[Structure of the invention]

The input/output interrupt notification method according to the present invention is applied to a virtual computer system having a control program that controls execution of a plurality of operating systems on a computer system equipped with a data processing device, a main storage device, and an input/output device. a first interrupt holding unit that receives interrupt information from the output device and holds it; a second interrupt holding unit that sets and holds interrupt information according to the control program; while the operating system is running.

If interrupt information is set in the first interrupt suspending means, the first interrupt suspending means (second-side interrupt The present invention is characterized by comprising means for activating an interrupt processing program of the operating system being executed if interrupt information is set in the second interrupt holding means in a state where no information is set.

[Embodiments of the invention]

Next, an input/output interrupt notification method in the virtual computer system of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment according to the present invention. In this figure, main storage device 1
0 includes a first interrupt pending area 11 and a second interrupt pending area 12, and the input/output device 20 includes a first write circuit 2.
1 is included. The data processing device 30 includes a second write circuit 31, a first output circuit 62, and a second output circuit 3.
5 and 2 determination circuit 34, CP activation circuit 35, OS interrupt processing activation circuit 36, and OS activation circuit 37. The first interrupt pending area 11 includes a first write circuit 21
The input/output interrupt information from the input/output device 20 is held under the control of the input/output device 20. In the second interrupt pending area 12, interrupt information set by the control program is held by the second write circuit 31. The contents of the first interrupt pending area 11 and the second interrupt pending area 12 are the contents of the first interrupt pending area 11 and the second interrupt pending area 12, respectively.
It is read out by the continuation circuit 33 and judged by the 9 judgment circuit 34. According to the determination result of the determination circuit 64, the CP activation circuit 65;
S interrupt processing activation circuit 66 (Is the operating system's interrupt processing activated?

Alternatively, the operating system is started by the O8 startup circuit 67 (second).

2(a) and (1)) are flowcharts showing an example of the processing procedure in the embodiment of FIG. 1. In this figure (=, in process 200.

Operating system A on the virtual computer system,
(Described as 08-A in the figure) is being executed. In the next process 201.

Operating system A; second input/output device 20 (
A request for output to 2 (described as 10 request in the figure) is issued. In process 202, operating system A
From operating system B (=execution is dispatched. In process 203, a response to the input/output request issued by operating system A in process 201 (this is called an input/output interrupt, and is described as the 10 interrupt in Figure 1) is input. When output from the output device, execution of operating system B is interrupted and input/output interrupts are accepted.This processing is controlled by the hardware of the data processing device 30.However, input/output interrupts are always handled by the hardware. Rather than being accepted, interrupt acceptance is specified as a prohibited area by individual commands and interrupt masking functions of the operating system.In this process 203, before an input/output interrupt is issued by the input/output device 20, the first interrupt is The interrupt information is set in the interrupt pending area 11.

At operation 204E, in response to an input/output interrupt.

A control program (denoted as CP in the diagram) is activated by hardware control, and the interrupt information in the first interrupt pending area is notified to the control program (=notified).The reason why the control program is activated is that the data processing device This is because the control program needs to determine which operating system the input/output interrupt notified to is for.If the input/output interrupt is for operating system A, the input/output interrupt is for the operating system However, if the point at which operating system A is resumed is in a non-interruptible state (interrupts are disabled by instructions or by an interrupt masking function), then the I/O is not processed at that point. Therefore, in process 205, the control program determines whether the operating system A can accept interrupts, and according to the result, process 206 or process 207 is performed.
is executed. Process 206 is executed when operating system A is capable of accepting interrupts, and process 203
In order to process input/output interrupts accepted in
The interrupt processing program of operating system A is started.

Process 207 is executed when the operating system A is unable to accept interrupts, and in order to suspend input/output interrupt information until a point in time when it is possible to accept interrupts, the control program handles the interrupt information from the first interrupt pending area 11. It is set in the second interrupt pending area 12. In process 208,
Operating system A is restarted by the control program. At this time, the data processing device 30 is put into a state in which an interrupt from the input/output device 20 is issued in a pseudo manner by the control program. In process 209, when it is detected that the operating system A is in a state where it is possible to accept 9 interrupts during execution, a pseudo interrupt is accepted and the execution of the operating system A is interrupted.

In process 210, it is checked whether interrupt information is set in the first interrupt pending area 11 under hardware control. That is, after accepting the input/output interrupt in process 203, it is checked whether a new interrupt has occurred. If a new interrupt has occurred, process 211 is executed, and if no new interrupt has occurred, process 212 is executed. is executed.In step 211, in order to check which operating system the new input/output interrupt is for,
The control program is activated by the hardware (2). In this process 212, the hardware checks whether an interrupt is pending in the second interrupt pending area 12. It is checked whether there is any input/output interrupt information that has been put on hold until 9 interrupt acceptance is enabled.

The process 213 is executed in the second interrupt pending area 12 (if the second side interrupt information is set).

If it has not been set, processing 214 is executed.

In process 213, since the input/output interrupt to be processed by operating system A is pending, the interrupt processing program of operating system A is activated by the hardware.

In process 214, since no interrupts to be processed are pending, the operating system A
processing continues.

Note that the above embodiment is only an example of the present invention.

It is clear that the application of the present invention is not limited to the specific cases shown in this example.

〔Effect of the invention〕

As is clear from the above explanation (2), according to the present invention,
In a virtual computer system, by suspending interrupt requests from input/output devices and notifying a running operating system of the pending interrupt requests, processing overhead of a control program can be reduced.
The effect of improving processing efficiency is significant.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment according to the present invention;
2(a) and (1)) are flowcharts showing an example of the processing procedure in the embodiment of FIG. 1. In the figure, 10 is a main storage device, 11 is a first interrupt pending area, and 12 is a second interrupt pending area. 20 is an input/output device, and 21 is a first write circuit. 30 is a data processing device, and 31 is a second write circuit. 32 is a first successive circuit, and 33 is a second successive circuit. 34 is a judgment circuit, 35 is a CP activation circuit, ! +6 is an O8 interrupt processing starting circuit, and 37 is an OS starting circuit. Figure 1 and Figure 2 (α) Figure 2 (b)

Claims (1)

[Claims] 1. In a virtual computer system having a control program that controls the execution of multiple operating systems on a computer system equipped with a data processing device, a main storage device, and an input/output device, upon receiving interrupt information from the input/output device, a first interrupt holding means for holding interrupt information; a second interrupt holding means for setting and holding interrupt information by the control program; If the interrupt information is set in the first interrupt holding means, the interrupt information is set in the first interrupt holding means during execution of the operating system by the means for starting the control program and the data processing device. and means for activating an interrupt processing program of the operating system being executed if interrupt information is set in the second interrupt holding means when the interrupt processing program is not being executed.