JP2663587B2 - Input / output control device and method in computer system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input / output control device and method in a computer system, and more particularly to a method of managing a channel path in a computer system.

[Conventional technology]

Conventionally, in a computer system, between a central processing unit that performs high-speed arithmetic processing and the like and an input / output device that operates at a lower speed than the central processing unit due to mechanical operations, etc.
In order to realize efficient data transfer, input / output channel devices are used. FIG. 3 shows the hardware configuration of this conventional computer system. In FIG. 3, 10
1a and 101b are instruction processors, 102 is a main memory, 103 is an input / output channel device (input / output processor), 104a and 104b are disk controllers, 105a and 105b are disk devices, and 106 is a system controller. This I / O channel device 103
Is started between the disk controller 104 and the system controller 106 by an input / output start instruction executed by the instruction processor 101, receives the input / output start instruction, and enters the disk controller 105 together with the disk device 105 via the disk controller 104. Execute the output operation.

In recent years, a system form for connecting a plurality of input / output devices has increased, and thus it is necessary to manage channel paths. As its management function, a channel path group configuration function that groups a plurality of channel paths between channels and I / O devices, and a channel path that is once disconnected during command chain execution by I / O instructions, and There is a computer having an architecture having a channel path reconnection function (CPR) that reconnects with an arbitrary channel path in a channel path group including a channel path that has issued an input / output instruction and enables continuation of a command chain. Whether or not to use the CPR is controlled by turning on / off a bit in a parameter of a CCW (channel command word) of a channel path group configuration change. This CPR is the disk controller 104 and the disk unit
It is in 105.

This CCW receives a 12-byte parameter from the channel, and changes (forms, dissolves, or deletes) the path group configuration for the volume by designating the parameter. FIG. 4 shows a configuration example of this CCW. In FIG. 4, bit 0 (32) of byte 0 indicates whether CPR is valid or invalid. Bit 1 and bit 2 (33, 34) of byte 0 indicate the operation of this CCW (formation, dissolution, and deletion of a path group). Byte 1
Byte 11 indicates the path group identifier (36).
Bits 3 to 7 (35) of byte 0 indicate an empty area, and 0 is set because nothing is used.

When the path group configuration is changed by the CCW of the channel path group configuration, the path group identifier specified by the same channel path must always be the same regardless of the volume, and bit 0 of byte 0 of the parameter, that is, CPR
The specification of whether or not to use is also a target of comparison at the time of path group identification.

Therefore, if the path group identifier is different from the one previously received from the channel path, the command is rejected. In other words, all the channel paths belonging to the same channel path group must unify the use of CPR.

In addition, as an example of the related technology, Japanese Patent Application Laid-Open No. 54-1446941
Bulletin, or IBM 3880 Storage Control Unit Model 13
ol Unit model 13 description GA32-0067-03rd ed.1
982 June, p29).

[Problems to be solved by the invention]

Now, on an actual computer as described above, an OS (a first type OS) operating on a computer having an architecture having CPR
OS running on a computer with an architecture without CPR
Consider a virtual computer system that can simultaneously operate (a second type of OS). Then, the use of CPR may or may not be specified for the same channel path. This will be described with reference to FIG. In FIG.
The virtual machine control program (V
MCP) 403 and OS ₁ (401) which is the first type of OS
OS ₂ (402), which is the second type of OS, is operating. Now, OS ₁ issues an I / O instruction specifying the CCW of the path group configuration change having the parameters (CPR: ON, path group: A) shown in 405, and OS ₂ issues the parameter (CPR Suppose that an I / O instruction that specifies the CCW of the path group configuration change having the: off, path group: A) is issued. Then, CPR ON and OFF are designated for the path group A, and there is a problem that the contradiction described above occurs.

Even in the case of not being a virtual computer system as described above (that is, when one OS is operating on a real computer), for an I / O device connected to the same channel path, a certain I / O device is A similar problem arises when the reconnection function is enabled and another I / O device attempts to disable the channel path reconnection function. That is, validity and invalidity of the channel path reconnection function are designated for the same channel path. Such use of the input / output device is performed when a failure occurs in the channel path.

An object of the present invention is to solve such a conventional problem, to enable / disable a channel path reconnection function for each input / output device on a real computer, and to use CPR on a virtual computer system. It is another object of the present invention to provide an input / output control device and method in a computer system for improving input / output efficiency.

[Means for solving the problem]

In order to achieve the above object, an input / output control device in a computer system according to the present invention includes: a channel path group forming unit configured to group a plurality of channel paths between a channel and a plurality of input / output devices; And a channel path reconnecting means for disconnecting the channel path and reconnecting with an arbitrary channel path in the computer system, wherein the input / output control apparatus includes: It is characterized by having means for organizing into channel path groups that specify whether to use the channel path reconnection means.

Means for storing information on channel paths for each input / output device in the input / output control device;
Issues an input / output instruction for changing the channel path group configuration, updates the channel path information in the storage means by the organization means, and issues the input / output instruction when the OS on the computer issues the input / output instruction. It is characterized in that the knitting means refers to the channel path information in the storage means to determine whether to use the channel path reconnection means.

Further, the input / output control method in the computer system according to the present invention includes: a channel path group forming means for grouping a plurality of channel paths between a channel and a plurality of input / output devices; and the channel path in the channel path group. Channel path reconnecting means for disconnecting and reconnecting to an arbitrary channel path on a computer system,
A first type of OS capable of executing a channel path reconnection process and a channel path group formation process for supporting the above two means by a virtual machine control program for controlling a plurality of virtual machines; A second type of OS capable of executing a channel path group configuration process for supporting the means is simultaneously operated, and each virtual machine performs the above-mentioned operation for the same channel path in a virtual machine system exclusively using input / output devices. When the validity / invalidity of the channel path reconnection processing cannot be designated, when the input / output instruction of the channel path group configuration change is issued from the second type OS, the virtual machine control program executes the channel path reconnection processing. It is characterized in that it is converted into an input / output instruction that makes the processing effective.

Further, the input / output control method in the computer system according to the present invention further comprises a channel path group forming means for grouping a plurality of channel paths between a channel and a plurality of input / output devices, and the channel path in the channel path group. A virtual machine control program for controlling a plurality of virtual machines on a computer system having a channel path reconnecting means for disconnecting a virtual path and reconnecting to an arbitrary channel path. A first type of OS capable of executing a reconnection process and a channel path group configuration process and a second type of OS capable of executing at least a channel path group configuration process for supporting the channel path group configuration means operate simultaneously Each virtual machine is the same in a virtual machine system that exclusively uses input / output devices. When the validity / invalidity of the channel path reconnection process cannot be specified for the channel path of the above, the channel path used by the OS in FIG. 1 and the channel path used by the second type OS are changed to physically different channel paths. There is a feature in doing.

[Action]

In the present invention, when the OS on the computer issues an input / output command for changing the channel path group configuration, the knitting means updates the channel path information in the storage means, and the OS on the computer is entered. When the output command is issued, the knitting unit refers to the channel path information in the storage unit to determine whether to use the channel path reconnection unit.

Further, when it is not possible to designate the validity / invalidity of the channel path reconnection processing for the same channel path, and when the input / output instruction of the channel path group configuration change is issued from the second type OS. Then, the virtual machine control program converts the command into an input / output command that makes the channel path reconnection process effective.

Further, when the validity / invalidity of the channel path reconnection processing cannot be designated for the same channel path, the channel path used by the first type OS and the channel path used by the second type OS are physically Use a different channel path. As a result, input / output efficiency can be improved.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 (a) and 1 (b) are diagrams for explaining an outline of a computer system to which the present invention is applied.

1 (a) and 1 (b), 101a and 101b are instruction processors, 102 is a main storage device, 103 is an input / output processor,
104a and 104b are input / output control devices (disk control devices in the present embodiment), 105a and 105b are input / output devices (disk devices in this embodiment), and 106 is a system control device. In FIG. 1A, the channel path information table (CPIT) 10 is stored in the internal storage device of the disk control device 104.
8a and 108b are stored. In FIG. 1 (b),
The virtual machine control program (VMC
P) is stored.

The case where it is possible to specify whether or not to use the channel path reconnecting means for each input / output device on the real computer system is as follows: (1) The first embodiment (FIG. 1 (a)); A case in which the program (VMCP) 107 is enabled by using the program (VMCP) 107 will be described in detail below as a second embodiment (FIG. 1B).

(I) First Embodiment In the first embodiment, a channel path group configuration processing circuit for grouping a plurality of channel paths between a channel and a plurality of input / output devices, On a computer system including an input / output control device having a channel path reconnection processing circuit (CPR) for disconnecting a channel path and reconnecting to an arbitrary channel path,
By having means (see FIG. 2 described later) for forming a channel path group that specifies whether to use the channel path reconnection processing circuit for each input / output device, input / output efficiency can be improved.

FIG. 2 is a diagram showing a detailed configuration example of the disk control device 104 in FIG.

In FIG. 2, reference numeral 201 denotes a CCW decoding unit that decodes a channel command word (CCW) transferred from the input / output processor 103, and 202 denotes a CCW execution unit that executes the CCW. Path information table (CPI
T) There is a microprogram section 203 for updating, CCW
The execution unit 202 includes a microprogram unit 204 for determining whether or not to use the channel path reconnection processing circuit 280 by accessing the channel path information table 108 during CCW execution. Reference numeral 108 denotes a channel path information table (CPIT) in a memory in the disk controller 104 corresponding to a disk device connected to the disk controller. In this embodiment, it is assumed that a maximum of 32 disk devices are connected to one disk control device.

210 in the channel path information table 108 is a channel path name area holding a channel path name, 211 is a channel path group name area holding a channel path group name to which the channel path belongs, and 212 is a channel path reconnection processing circuit (CPR). Use valid / invalid information (CPR on or CPR
OFF) is the CPR area that holds Reference numeral 220 denotes a register that holds an address of each channel path information table.
Reference numeral 222 denotes a device number register in which the device number of the device specified by the input / output instruction is sent from the input / output processor 103 and held. One of the addresses is selected and stored in the CPIT address holding register 223. Two
Reference numeral 30 denotes a channel path name register in which the channel path name specified by the input / output instruction is sent from the input / output processor 103 and stored. Reference numeral 231 denotes a channel path group name specified by the input / output instruction and information on whether or not the channel path reconnection processing circuit (CPR) 280 is used.
This is a parameter register sent and held by the controller.
The contents of the register 231 are stored in the register 2 according to a command from the microprogram 203 for updating the channel path information table.
This is set in the entry of the channel path name indicated by the register 230 in the channel path information table indicated by the contents of 23. Reference numeral 270 denotes a channel path group configuration processing circuit that performs channel path group configuration processing, and reference numeral 280 denotes a channel path reconnection processing circuit (CPR) that performs channel path reconnection processing.

FIG. 6 is a processing flowchart of the micro program 203 for updating the channel path information table (CPIT).

When the OS issues an instruction to activate I / O (step 60
1), a channel command word (CC
W) is transferred to the disk controller 104. So,
If CCW is for channel path group configuration change,
The address of the channel path information table for the device specified by the input / output instruction is obtained from the CPIT address holding register 223 (step 602). By using this, the channel path information table of the device specified by the input / output command is checked, and an input / output command for changing the channel path group configuration has already been issued for the device and the channel path specified by the input / output command. It is checked whether or not it has been performed (step 603). If issued, the channel path group name and the use / non-use (CPR on / off) of the channel reconnection processing circuit (CPR) are registered for the channel path in the channel path information table of the device. Should be. Therefore, the registered channel path group name and CPR
Then, it is determined whether or not the use of is the same as those indicated by the CCW in the input / output instruction (step 604). If not, an error is made and an interrupt is generated as a unit check (step 605). If they are equal, the process ends.

On the other hand, in step 603, if it has not been issued, a trigger signal is sent to the signal line 260, and the channel path group table corresponding to the device and the relevant channel path is stored in the channel path information table indicated by the contents of the register 223 in the disk controller. Register your name and whether you use CPR. Further, a channel path information table of the same format as the channel path information table 108 shown in FIG. 2 in the device (disk device) (this is the same as the conventional one) is specified in the channel path. The registered channel path group name and the use of CPR are registered (step 606).

FIG. 7 is a flowchart of the microprogram 204 for determining the use of the channel path reconnection processing circuit (CPR).

When an I / O instruction is issued from the OS (step 70
1) The CPIT address holding register stores the address of the channel path information table for the device specified by the input / output instruction.
223 (step 702), the CPR area of the channel path information table is used to determine whether the channel path reconnection processing circuit 280 of the channel path of the device specified by the input / output command is used. ON (ON) / OFF (OF
The state of F) is checked (step 703). If on, use CPR (step 704); if off, use CPR
Do not use CPR (step 705).

As described above, in the first embodiment, the OS can specify whether or not to use the channel path reconnection processing circuit for each input / output device. Further, even when the virtual computer system is operated on a real computer as described herein, if each virtual computer occupies an input / output device exclusively, the virtual path using the channel path reconnection processing circuit is used. A computer and an unused virtual computer can be run simultaneously.

(II) Second Embodiment The second embodiment is different from the first embodiment using a channel path information table in that the second embodiment is realized by control by VMCP. That is, a channel path group configuration processing circuit for grouping a plurality of channel paths between a channel and a plurality of input / output devices, disconnection of the channel path within the channel path group, and reconnection with an arbitrary channel path A plurality of virtual machines (VM) and a virtual machine control program (VMCP) for controlling the plurality of VMs use the above two processing circuits on a computer system having a channel path reconnection processing circuit (CPR) for performing Simultaneously operating a possible first type OS and at least a second type OS capable of using the channel path group configuration processing circuit,
When it is not possible to specify the validity / invalidity of the above CPR for the same channel path in a virtual machine system in which each VM exclusively occupies the I / O device, this is enabled by VMCP control to improve the I / O efficiency Let me. Hereinafter, the eighth
The input / output processing under the control by the VMCP will be described with reference to the flowcharts of FIGS.

FIG. 8 is a processing flowchart when all the channel paths are divided into separate channel path groups.

Here, when there is a virtual machine on which the second type OS runs in the system, the VMCP causes each of the channel paths to which the input / output instruction is issued to individually configure a separate channel path group. And the second
When an I / O instruction specifying invalid CPR is issued from a certain OS, the execution is interrupted and control is passed to VMCP. VM
The CP converts the input / output instruction into an instruction specifying the validity of CPR and issues the instruction to the input / output device.

That is, according to the flow of FIG. 8, a different channel path group name is designated for all the channel paths, and an I / O instruction for changing the path group configuration is issued (step 801). Then, an input / output instruction designating invalidation of the CPR issued from the second type OS is assigned to the VMCP (step 80).
2). Next, bit 32 for specifying the validity of CPR in the channel command word of the path group configuration change in the channel command word string specified by the indexed I / O instruction
(See FIG. 4) is turned on, and the instruction is issued to the input / output device (step 803).

As described above, in the embodiment shown in FIG. 8, since all the channel paths used at the time of input / output constitute a separate channel path group, the input / output instruction is specified by specifying the validity of CPR. Even if issued, only one channel path is actually used. Therefore, guest OS (second type OS)
Is conscious as if CPR had not been used.

FIG. 9 is a processing flowchart when the path group is dissolved.

Here, when there is a virtual machine on which the second type OS operates in the system, the VMCP prevents all the channel paths to which input / output instructions are issued in advance from forming a channel path group. When an I / O instruction for changing the channel path group configuration is issued from the guest OS, the execution of the I / O instruction is interrupted and control is passed to VMCP. Convert and do not execute CCW for changing channel path group configuration.

That is, according to the flow of FIG. 9, first, an input / output instruction of path group dissolution is issued for all path groups (step 901). Then, the input / output command issued from the guest OS is indexed to the VMCP (step 902). next,
If there is a channel command word for path group configuration change in the channel command word string specified by the indexed I / O instruction, the channel command word is changed to NO-OPERATIO
Rewritten to N (NO-OP) and issued to the input / output device (step 903). At the time of the input / output interrupt processing, the fact that the path group has not been configured is reported to the guest OS (step 904).

Thus, in the embodiment shown in FIG. 9, all the channel paths used at the time of input / output do not constitute a channel path group. Therefore, an input / output command for changing the channel path group configuration issued from the guest OS is assigned to the VMCP so that the CCW for changing the channel path configuration is not executed.

FIG. 10 is a processing flowchart in a case where the number of real channel paths to be used is fixed to one.

Here, the VMCP makes a one-to-one correspondence between a channel path recognized by the second type OS and an actual channel path in advance. When an I / O instruction for changing the path group configuration is issued from the second type OS, the execution of the I / O instruction is interrupted and control is passed to the VMCP. VMCP uses this I / O instruction as CPR
Is converted to an input / output instruction that specifies the validity of the command, and a channel command word for suppressing CPR is added to the input / output, and then the input / output instruction is issued. Then, at the time of the input / output interrupt processing, the VMCP converts the channel path at the time of the interrupt into the channel path of the second type of OS corresponding to the actual channel path where the interrupt has occurred, and reports it to the second type of OS.

That is, according to the flow of FIG. 10, first, the channel path recognized by the guest OS and the actual channel path are in one-to-one correspondence.
Then, a channel path management table corresponding to is created and stored in the VMCP area on the main storage device (step 1001). Then, an I / O command for changing the path group configuration issued from the guest OS is assigned to the VMCP (step 1002). Next, CP
Converts the validity of R to the specified input / output instruction (Step 100
3). Further, when an input / output instruction is issued from the second type guest OS, the input / output instruction is indexed to the VMCP (step 100).
4), a channel command word for suppressing the use of CPR in the command chain is added to the beginning of the channel command word string specified by the input / output instruction, and the input / output instruction is issued to the input / output device. (Step 1005). At the time of I / O interrupt processing, using the channel path management table,
Guest OS corresponding to the channel path where the interrupt actually occurred
The interrupted channel path is converted to the channel path of (1) and a report to the guest OS is made (step 1006).

As described above, in the embodiment shown in FIG. 10, the input / output instruction (CPR is invalid) of the path group configuration change issued by the second type of guest OS is the one in which CPR is valid in VMCP. Because it is converted, the command is not rejected. In addition, input / output is performed by adding a channel command word that suppresses CPR, and at the time of input / output interrupt processing, the channel path at the time of the interrupt is converted to a channel path corresponding to the actual channel path where the interrupt occurred, and reported to the guest OS So the guest OS
(Second OS) recognizes that CPR was not used.

FIG. 11 is a processing flowchart when a plurality of real channel paths to be used are made possible.

Here, in the VMCP, only one channel path can be recognized from the guest OS in advance. When an input / output instruction is issued from the second type of OS, execution of the input / output instruction is interrupted and control is passed to the VMCP. In VMCP, this input / output instruction is called CP
Converts the validity of R into a specified I / O instruction and issues it to the I / O device.

That is, according to the flow of FIG. 11, first, a channel path management table for associating only one channel path recognizable by the guest OS with an actual channel path is created in the VMCP area on the main storage device ( Step 1101).
Then, the input / output instruction issued from the guest OS is determined,
Control is passed to the VMCP (step 1102). Next, the input / output instruction is converted into an input / output instruction specifying the validity of CPR, and the input / output instruction is issued to the input / output device (step 110).
3). At the time of input / output interrupt processing, the channel path in which the interrupt has actually occurred is converted into the only channel path that can be recognized by the guest OS using the channel path management table, and a report is made to the guest OS (step 1104). ).

Thus, in the embodiment shown in FIG. 11, the guest OS
Since only one channel path can be recognized from the (second type OS), the guest OS cannot recognize that even if CPR works at the time of actual input / output. That is, it recognizes that an input / output interrupt has been returned from the channel path that issued the input / output instruction.

FIG. 12 is a processing flowchart for separating a channel path between an OS using CPR and an OS not using CPR.

Here, the virtual machine on which the first type OS is running (first
Virtual machine (second VM) and a virtual machine (second
Separate the channel paths used by different VMs and make them completely separate.

That is, according to the flow of FIG. 12, first, the first type OS
And a channel path management table for separating an actual channel path used by the second type OS is created and stored in the VMCP area in the main storage device. Then, a path group is formed from the separated paths (step 1201). The input / output instruction issued from the guest OS is assigned to the VMCP (step 1202). The VMCP selects a channel path for the input / output device using the channel path management table, and issues the input / output command to the input / output device (step 1203).

8 to 11, the conversion process of the input / output instruction is performed by the VMCP to make the CPR effective. However, in the embodiment of FIG. 12, the conversion by the VMCP is not performed, and the first type is used. OS and 2nd
Since the channel paths used by different OSs are physically different, no inconsistency occurs. Also, the channel path (channel path group) used by the first type OS and the second
Since the channel paths (channel path groups) used by the various OSs are completely different, both OSs can operate.

〔The invention's effect〕

As described above, according to the present invention, it is possible to specify whether or not to use the channel path reconnection function for each input / output device on a real computer. ) Can be used, so that the input / output efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining an outline of a computer system to which the present invention is applied, FIG. 2 is a diagram showing a detailed configuration example of a disk control device and a channel path information table in FIG. 1,
FIG. 3 is a hardware configuration diagram of a conventional computer system,
FIG. 4 is a diagram showing a configuration example of a channel command word (CCW), and FIG. 5 is a diagram for explaining inconsistency when a path group configuration change input / output instruction is issued from the first type OS and the second type OS. FIG. 6 is a flowchart of a microprogram processing for updating the channel path information table (CPIT) in the first embodiment of the present invention. FIG. 7 is a channel path reconnection processing circuit (FIG. 7) in the first embodiment of the present invention. FIG. 8 is a flowchart of a microprogram for determining use, FIG. 8 is a flowchart of a process when all the channel paths in the second embodiment of the present invention are divided into separate channel path groups, and FIG. 9 is a flowchart of the present invention. FIG. 10 is a processing flowchart when a path group is dissolved in the second embodiment. FIG. 10 shows one actual channel path used in the second embodiment of the present invention.
FIG. 11 is a processing flowchart for fixing to a book, FIG. 11 is a processing flowchart for enabling a plurality of real channel paths to be used in the second embodiment of the present invention, and FIG. 12 is a second embodiment of the present invention. 7 is a processing flowchart in a case where a channel path is separated between an OS using CPR and an OS not using CPR in FIG. 101a, 101b: instruction processor, 102: main memory, 103: input / output processor, 104a, 104b: disk controller, 105a, 105
b: disk device, 106: system control device, 108a, 108b: channel path information table, 201: CCW decoding unit, 202: CCW
Executing unit, 203: CPIT update microprogram, 204: CPR
Microprogram for use decision, 210: channel path name area, 211: channel path group name area, 212: CPR area, 220: register, 221: selection circuit, 222: register for device number, 223: CPIT address holding register, 230 : Register for channel path name, 231: Register for parameter.

Claims (8)

(57) [Claims] 1. A channel path group forming means for grouping a plurality of channel paths between a channel and a plurality of input / output devices, and separation of the channel paths and arbitrary channel paths within the channel path group. In a computer system having an input / output control device having channel path reconnection means for performing reconnection, it is specified whether or not the channel path reconnection means is used for each input / output device in the input / output control device. An input / output control device in a computer system, comprising means for organizing into channel path groups. 2. An apparatus according to claim 1, further comprising means for storing information relating to a channel path for each input / output device in said input / output control device, wherein when the OS on said computer issues an input / output command for changing a channel path group configuration. By updating the channel path information in the storage means by the knitting means, and when the OS on the computer issues an input / output command, the knitting means refers to the channel path information in the storage means, 2. An input / output control device in a computer system according to claim 1, wherein whether to use said channel path reconnection means is determined. 3. A channel path group forming means for grouping a plurality of channel paths between a channel and a plurality of input / output devices, and separating the channel path within the channel path group and an arbitrary channel path. On a computer system having channel path reconnection means for performing reconnection, a virtual computer control program for controlling a plurality of virtual machines is provided with a channel path reconnection processing and a channel path group configuration processing for supporting the above two means. And a second type of OS capable of executing at least a channel path group forming process for supporting the channel path group forming means are simultaneously operated, and each virtual machine is provided with an input / output device. In a virtual computer system that exclusively uses When the validity / invalidity of the continuation process cannot be specified, the virtual machine control program validates the channel path reconnection process when a channel path group configuration change input / output instruction is issued from the second type OS. An input / output control method in a computer system, which is converted into an input / output instruction as follows. 4. When the validity / invalidity of the channel path reconnection processing cannot be designated for the same channel path, an I / O instruction for changing a path group configuration is issued from the second type of OS. In this case, separate channel path groups are independently formed for the channel paths that issue the input / output instructions, and the execution of the input / output instructions is interrupted to pass control to the virtual computer control program. 4. The control program according to claim 3, further comprising a step of converting the input / output instruction into an input / output instruction designating the validity of the channel path reconnection process and issuing the input / output instruction to the input / output device. An input / output control method in a computer system. 5. When the validity / invalidity of the channel path reconnection processing cannot be designated for the same channel path, the channel path to which the second type OS issues an I / O instruction is a channel path group. Disabling the configuration, and interrupting the execution of the input / output instruction to pass control to the virtual machine control program, and the virtual machine control program converts the input / output instruction to an input specifying the validity of the channel path reconnection process. 4. The input / output control method in a computer system according to claim 3, further comprising a step of converting the input / output instruction to an output instruction and issuing the input / output instruction to the input / output device. 6. A channel for causing the virtual machine control program to recognize an OS (guest OS) operating on the virtual machine when validity / invalidity of channel path reconnection processing cannot be designated for the same channel path. A step of making the path correspond to the actual channel path on a one-to-one basis, and, when an input / output instruction designating invalidation of the channel path reconnection processing is issued from the second type OS, suspending the execution. Passing control to the virtual machine control program so that the virtual machine control program converts the input / output command into an input / output command designating the validity of the channel path reconnection process; Issuing an I / O command to an I / O device by adding a channel command word (CCW) that suppresses connection processing, and entering an interrupt during I / O interrupt processing Output control method in a computer system according to claim 3, characterized in that it has a real step the channel path of the guest OS and converts the channel path when an interrupt is reported to the guest OS corresponding to the channel path. 7. When the validity / invalidity of the channel path reconnection process cannot be specified for the same channel path, the virtual machine control program is executed by one OS (guest OS) running on the virtual machine. And when the input / output instruction is issued from the second type of OS, the execution of the input / output instruction is interrupted, and control is passed to the virtual machine control program. 4. The input / output control method in a computer system according to claim 3, further comprising the step of the virtual computer control program issuing the input / output command to the input / output device using a channel path reconnection process. 8. A channel path group forming means for grouping a plurality of channel paths between a channel and a plurality of input / output devices, and separating the channel path within the channel path group and an arbitrary channel path. On a computer system having channel path reconnection means for performing reconnection, a virtual computer control program for controlling a plurality of virtual machines is provided with a channel path reconnection processing and a channel path group configuration processing for supporting the above two means. And a second type of OS capable of executing at least a channel path group forming process for supporting the channel path group forming means are simultaneously operated, and each virtual machine is provided with an input / output device. In a virtual machine system that exclusively occupies the same channel path, When the validity / invalidity of the management cannot be specified,
An input / output control method in a computer system, wherein a channel path used by a first type OS and a channel path used by a second type OS are physically different channel paths.