JPH064446A - Method and device for input/output control of virtual computer system - Google Patents

Abstract

PURPOSE:To improve reliability and performance, and to reduce the overhead of a VM monitor in the case of executing input/output control by allocating a specific device to plural guest VMs(virtual computers). CONSTITUTION:Every plural access paths for input/output devices 12-1, 12-2 allocated to guest VMs 10-1, 10-2 one-to-one, a table in which a group ID issued from each of the guest VMs 10-1, 10-2 is stored is held in a holding means 16, and when an input/output instruction issued from the guest VMs 10-1, 10-2 is received, the access path belonging to the same group is detected from among plural access paths for the input/output device by referring to the table of the holding means 16 with respect to a group to which the input/output device executing the input/output instruction belongs, and by using one of the access paths detected by an input/output executing means 20, an input and an output between the guest VMs 10-1, 10-2 are executed. Even in a state that a single magnetic disk device is shared between plural guest VMs, exclusive control is executed without necessitating an intervention of a VM monitor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a plurality of operating systems (hereinafter referred to as "O") operating on a virtual computer system.
A virtual computer system that performs input / output control by allocating a specific device among input / output devices such as a plurality of magnetic disk devices to a plurality of guest virtual computers (hereinafter referred to as "guest VMs") realized by "S"). The present invention relates to an output control method and device.

When a guest VM realized by a plurality of OSs shares a disk control device and a plurality of magnetic disk devices under the control of the disk control device are assigned to a specific guest VM on a one-to-one basis for input / output, The overhead of the virtual machine system increases and the performance deteriorates. On the other hand, one disk unit under the control of a disk controller is connected to multiple guest VMs.
In the case of sharing with each other, if the physical access path is dedicated to each guest VM, the guest VM to be shared is limited by the number of physical access paths. Therefore, there is a method of assigning one physical access path to a plurality of guest VMs.

However, when one physical access path is assigned to a plurality of guest VMs, input / output control for sharing the disk controller and physical access paths with a plurality of guest VMs is required, and the overhead of the virtual computer system is increased. It increases and the performance deteriorates. Furthermore, since the disk controller originally plans input / output control by one OS,
When controlled by a plurality of guest VMs, the function of the multiple access path for improving performance and reliability cannot be used, and improvement of this point is desired.

[0004]

2. Description of the Related Art Conventionally, in a virtual computer system,
A disk controller is connected to a main memory controller (MCU) of a main memory unit (MSU) through a channel device,
A plurality of magnetic disk devices are connected under the disk control device. In this case, a plurality of disk control devices can be connected to one channel device. A plurality of magnetic disk devices can be connected to one disk control device. [Mode in which I / O devices are assigned to guest VMs on a one-to-one basis] FIG. 14 shows an example of an I / O subsystem in a conventional virtual computer system. A plurality of magnetic disks are provided under one disk control device 14. Disk devices 12-1, 12-
This is an example in which 2 is connected by two routes.

Guest VM10 of main memory unit (MSU)
Two channel devices 16-1 corresponding to 1, 10-2,
16-2 is provided, and channel devices 16-1, 16-2
Is a channel adapter 24-1 of the disk controller 14,
It is connected to 24-2. Magnetic disk device 12-1
Or channel device 16 must be used to access 12-2
-1 or 16-2 and the disk control device 14, and a path for accessing the magnetic disk devices 12-1, 12-2 is called an access path. Also, the access path is expressed together with the number added to each device.

For example, the channel devices 16-1, 16-2
, CH2, the channel controller numbers of the disk control device 14 are CA1 and CA2, and the magnetic disk devices 12-1 and 12-2 are DEV-1 and DEV-2, the access paths 111, 112, and 221. , 222
Expressed as, means the next route. [Access Path] 111 CH1 to CA1 to DEV-1 112 CH1 to CA1 to DEV-2 221 CH2 to CA2 to DEV-1 222 CH2 to CA2 to DEV-2 Virtual using the input / output configuration as shown in FIG. When operating the computer system, there is an operation mode in which the individual magnetic disk devices 12-1 and 12-2 under the disk control device 14 are allocated to the guest VMs 10-1 and 10-2 in a one-to-one manner and used. .

In FIG. 14, since the magnetic disk device 12-1 is assigned to the guest VM 10-1, the access path 111 and the access path 221 can be used in the guest VM 10-1. Since the magnetic disk device 12-2 is assigned to the guest VM 10-2, the access path 11
2 and the access path 222 can be used by the guest VM 10-2.

One such guest VM and disk device
In the case of the one-to-one allocation, the disk controller 14 and the channel devices 16-1 and 16-2 have a plurality of guest VMs 1.
Since it is shared between 0-1 and 10-2, it is effective in terms of effective use of resources. Meanwhile, some disk control devices 14 are equipped with the following functions for the purpose of improving performance and reliability.

Dynamic path recoupling function By performing recoupling after the seek of the magnetic disk devices 12-1 and 12-2 is completed from an open access path, the input / output response time can be shortened and the performance is improved. To do. Extended reserve function When an error occurs while the OS reserves the magnetic disk device 12-1 or 12-2, another channel can be used to access 12-2 between the magnetic disk devices 12-1 for reliability. The property is improved.

In order to use these functions, it is necessary to form a plurality of access paths for the magnetic disk devices 12-1 and 12-2. That is, it is sufficient to declare to the disk control device 14 that a plurality of access paths via the disk control device 14 are used only by one system (one OS) in the form of group formation.

For example, when the guest VM 10-1 uses the dynamic path rejoin function or the extended reserve function, the operating system operating on the guest VM 10-1 is the magnetic disk device 1 assigned to the guest VM.
2-1 issues a group ID setting command for each of the two access paths 111 and 221 to cause the channel adapters 24-1 and 24-2 of the disk control device 14 to hold the same group ID and to the magnetic disk device 12-1. A group of two access paths 111 and 221 is formed. [Shared mode in which a single input / output device is assigned to a plurality of guest VMs] FIG. 15 shows the channel device 16-1, the disk controller 14 and the magnetic disk device 12-1 as two guest VMs 10-1 and 10-2. FIG. 5 is an explanatory diagram showing an operation mode in which the same is assigned to and used in common.

In this case, the magnetic disk device 12-1
Since the guest VM 10-1 and the guest VM 10-2 use the access path 111 to the guest VM 10, one access path can be shared by a plurality of guest VMs, which is effective in terms of effective use of resources. Also in the operation mode shown in FIG. 15, as in the case of FIG. 14, the disk control device 14 is provided with a dynamic path reconnection function and an extended reserve function for the purpose of performance improvement and reliability improvement.

[0013]

However, as shown in FIG.
In the input / output mode in which a magnetic disk device is assigned to the guest VM 1 to 1 and one guest disk controller is shared by a plurality of guest VMs, the dynamic path that requires access path group formation is shown in FIG. There is a problem that the recombining function and the extended reserve function cannot be used.

The reason is that the disk controller originally has a channel command word (CC) from the channel device.
This is because the operation by assuming that the instruction by W) is from one system (one OS),
This is because CCWs cannot be distinguished from the plurality of guest VMs 10-1 and 10-2 as shown in FIG. Therefore, in the conventional virtual machine system, in order to prevent the VM monitor from issuing a group ID setting command from a plurality of guest VMs at the time of system startup and the subsequent input / output operation cannot be guaranteed, the VM monitor A method of intercepting all issued I / O commands and simulating the group ID setting command in the I / O request as an error is adopted, and the group formation command is rejected.

In the simulation in which the group ID setting instruction in the input / output request is an error, when the guest VM issues the input / output instruction, the VM monitor monitors whether or not the group ID setting instruction is issued. When it detects it, it rejects the command. As a result, in a mode in which one guest disk controller is shared by multiple guest VMs,
The dynamic route rejoin function and the extended reserve function, which require the formation of access path groups, cannot be used, resulting in poor performance and poor reliability.

Further, the VM monitor rejects the group ID setting command due to error simulation.
Since the intervention of the O instruction is performed, the overhead of the VM monitor is increased, and there is a problem that the deterioration of performance is promoted. On the other hand, in the input / output mode in which one magnetic disk device shown in FIG. 15 is shared by a plurality of guest VMs, the guest VMs 10-1 and 10-2 may simultaneously make input / output requests. The device 14 will be equipped with the function of performing exclusive control.

However, the disk controller 14 does not use the channel command word (C
Since the operation by assuming that the instruction by the CW is from one system (one OS), if one access path is shared by a plurality of systems (a plurality of OSs), exclusive control cannot be performed. Therefore, in the conventional system, V
It is necessary for the M monitor to intercept the I / O instruction and the I / O interrupt in order to perform the error simulation of the exclusive control instruction in place of the disk controller 14, which increases the VM monitor overhead and accelerates the performance deterioration. there were.

As in the operation mode of FIG. 14, since a plurality of guest VMs share one disk controller, the dynamic path rejoining function and the expansion reserve that require the formation of access path groups are provided. The function cannot be used, resulting in poor performance and poor reliability. An object of the present invention is to provide an input / output control method and apparatus for a virtual computer system, which enables the input / output control device to recognize a plurality of virtual computers in the operating mode of the virtual computer system sharing the input / output control device. .

Another object of the present invention is to provide a virtual computer with a one-to-one correspondence.
Provided is an input / output control method and apparatus for a virtual computer system, which allows an input / output control device to recognize a plurality of virtual computers when an input / output device is assigned to the virtual machine. Another object of the present invention is to provide an input / output control method and device for a virtual computer system in which an input / output control device recognizes a virtual computer and enables access path group formation for each virtual computer.

Another object of the present invention is to provide an input / output control method for a virtual computer system which enables a dynamic reconnection function using a plurality of access paths in response to a reconnection request from an input / output device. Another object of the present invention is to provide an input / output control method for a computer system which enables an extended reserve function capable of executing a reserve instruction in another access path when a failure occurs during execution of the reserve instruction.

Another object of the present invention is to install a virtual computer system which reduces the overhead of the virtual computer monitor program (VM monitor) by eliminating the intervention of the VM monitor for the I / O instructions issued by the virtual computer. Provide an output control method. Another object of the present invention is that when a plurality of virtual computers share one input / output device, the input / output control device recognizes the plurality of virtual computers and can perform exclusive control without requiring intervention of a VM monitor. An input / output control method and apparatus for a virtual computer system are provided.

Another object of the present invention is a virtual computer system capable of forming an access path group, a dynamic route rejoining function, and an extended reserve function when a plurality of virtual computers share one input / output device. And an input / output control method and device for the same.

[0023]

FIG. 1 illustrates the principle of the first invention of the present application. First, the first aspect of the present invention relates to a plurality of guest VMs 10-1 and 10 realized by a virtual machine monitor program (VM monitor) 22 that controls a virtual machine system.
-2 and a plurality of input / output devices 12-1, 12- assigned to each of the plurality of guest VMs 10-1, 10-2 in a one-to-one relationship
2, an input / output control unit (CU) 14 coupled to each of the plurality of input / output devices 12-1 and 12-2 by at least two access paths (physical access paths), and an input / output control device 14. At least two channel devices (CH) 16- coupled to the plurality of guest VMs 10-1 and 10-2
An input / output control method and apparatus of a virtual computer system including the first and the second 16-2 are provided.

Taking the device configuration as an example, in the first invention, the guest VMs 10-1 and 10 are provided in the input / output control device 14.
-2 through the channel devices 16-1, 16-2 and the input / output control device 14 to the input / output devices 12-1, 12-2, a plurality of access paths 111, 112, 221, 22.
A group ID holding unit 16 that holds a table that sets the group ID issued by each of the guest VMs 10-1 and 10-2 for each 2 and a specific group ID in the group ID that is set in the table of the group ID holding unit 16 Group ID
Clearing means 18 for clearing the guest VM 10-1,
When the input / output command issued by 10-2 is received, the access path belonging to the same group is detected from the plurality of access paths reaching the input / output device by referring to the table of the group ID holding means 16, and the access path is detected. And an input / output execution unit 20 for executing input / output with the guest VMs 10-1 and 10-2.

Here, the group ID holding means 16 provided in the input / output control device 14 determines the guest VMs 10-1 and 10-2 based on the allocation result of the input / output devices 12-1 and 12-2 by the VM monitor program 22. The group ID is set by the group ID setting process of the operating system (OS) that is activated and operates on the virtual computer.

The clearing means 18 provided in the input / output control device 14 clears a specific group ID according to an instruction from the VM monitor program 22. For example, the VM monitor program 22 is the guest V of the input / output devices 12-1 and 12-2.
Group I used by the guest virtual computers 10-1 and 10-2 at the time of changing the allocation to M10-1 and 10-2
In order to clear D, the clear means 18 of the input / output control device 14 is instructed to clear.

The input / output control device 14 has a plurality of channel adapters 24-1 and 24-2 that are connected to the plurality of channel devices 16-1 and 16-1, respectively.
A table for setting the group ID for each of -1, 24-2 is provided. Input / output execution means 20 of input / output control device 14
Is the group ID obtained from the table of the holding means 16.
I / O processing is executed using the access paths that belong to the same group specified in.

Further, the input / output devices 12-1 and 12-2 are magnetic disk devices, and the input / output control device 14 is a magnetic disk control device. FIG. 2 is a diagram for explaining the principle of the second invention of the present application, showing the apparatus configuration as an example. The second invention is premised on a form in which one input / output device 12-1 is shared by a plurality of guest VMs 10-1 and 10-2. That is, the plurality of guest virtual computers 10-1 and 10-2 realized by the virtual computer monitor program 22 are the channel devices 16
-1, input / output device 12-1 via input / output control device 14
And a plurality of logical access paths 1111 and 2111 are combined with a single physical access path 111.

Such guest VMs 10-1 and 10-2
According to the second aspect of sharing the input / output device 12-1 according to the present invention, the guest VMs 10-1 and 10 are provided in the input / output control device 14.
-Logical access path 1 instructed by I / O command from -2
A plurality of logical access paths 1111 and 21 from the guest VMs 10-1 and 10-2 to the input / output device 12-1 are converted while the 111 and 11111 are converted into the physical access paths 111.
A group ID holding unit 16 that holds the group ID set by each of the guest VMs 10-1 and 10-2 for each 11 and a clearing unit that clears the specific group ID held in the table of the group ID holding unit 16 1
8 and the guest VMs 10-1 and 10-2 receive an input / output command issued by the group ID holding means 1
6, an exclusive control means 40 for converting a logical access path to a physical access path 111 to control access conflict by referring to the table of FIG. 6, and an input / output command for the input / output device 12-1 based on the control result of the exclusive control means 40. And an input / output execution unit 20 for executing. The points other than the exclusive control are the same as those of the first invention.

[0030]

According to the input / output control method and apparatus of the present invention having such a configuration, the disk controller (input / output controller) is provided with a plurality of guest VMs for each access path to the magnetic disk device (input / output apparatus). Since it is possible to set a specific type of group ID issued by the
The command word (CCW) can be discriminated by the disk control device, and a group can be formed with two or more access paths by allocating the magnetic disk device to the guest VM in a one-to-one manner.

Even in the form in which a single magnetic disk device is shared by a plurality of guest VMs, the disk control device can recognize a plurality of guest VMs, so that exclusive control can be performed without the need for intervention of a VM monitor. It is also possible to perform group formation with two or more access paths.
By forming this group, it is possible to efficiently secure an access path when the magnetic disk device is started and separated by an I / O command and is rejoined after the seek is completed. The time can be shortened.

Further, when a failure occurs while the guest VM reserves the magnetic disk device, it is possible to realize a so-called extended reserve function that allows access using another channel and improve the reliability.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 is a block diagram of an embodiment showing a hardware configuration of a virtual computer system to which the input / output control of the present invention is applied. In FIG. 3, 32 is a main memory device (MS
U) and a plurality of O's operating on the virtual computer system.
Multiple guest VMs 10-1, 10- realized by S
2 and a VM monitor 22 for monitoring and controlling the virtual computer system.

The main storage device 32 includes a main storage control device (MC
U) 28 is connected and receives store access or load access via the main memory controller 28. A plurality of CPUs 30-1 to 30-n are connected to the main storage controller 28 to form a multiprocessor system.
The OS of the guest VMs 10-1 and 10-2, the VM monitor 22 and the like is executed by the dispatcher function of the VM monitor 22 that performs allocation.

Further, one disk controller 14 is connected to the main memory controller 28 as an IO sub-channel via the channel devices 16-1 and 16-2, and a plurality of disk controllers 14 are subordinate to the disk controller 14. Magnetic disk device 12-
1, 12-2 are connected by two paths. The disk controller 14 is provided with channel adapters (CA) 24-1 and 24-2 for the channel devices 16-1 and 16-2, respectively, and the channel adapters 24-1 and 24-2 are controllers 26 using CPUs. Input / output control by.

FIG. 4 is an explanatory view showing the processing function of the input / output control according to the first invention of the present application, and the channel devices 16-1, 16 for the guest VMs 10-1, 10-2 and the VM monitor 22 realized by the OS. -2, the disk control device 14 and the magnetic disk devices 12-1 and 12-2 are shown together with their hardware configurations. The disk controller 14 includes a controller 26 and channel adapters 24-1, 24-2.
And the controller 26 includes the group ID holding unit 16,
This is a kind of processing device having the functions of the clear unit 18 and the input / output execution unit 20, and further, the group ID holding unit 1
A control storage 25 for expanding a table whose contents are managed by the control unit 6 is provided.

That is, the group ID holding unit 16 allows the guest VMs 10-1 and 10-2 to switch to the channel device 16-.
Guest VM for each of a plurality of access paths 111, 112, 221, 222 reaching the magnetic disk devices 12-1, 12-2 via the disk drive device 1, 16-2 and the disk control device 14.
The control memory 25 holds a table in which the group ID issued by each of 10-1 and 10-2 is set.

Further, the clearing section 18 clears a specific group ID among the group IDs stored in the table of the control memory 25 by the group ID holding section 16. Further, the input / output execution unit 20 allows the guest VMs 10-1 and 10
-2 receives the input / output instruction, the control storage 25 stores the group to which the input / output device that executes the input / output instruction belongs.
Group ID holding unit 16 to detect at least two access paths belonging to the same group, form a group with the two access paths, and create the guest V
Input / output between M10-1 and M10-2 is executed.

The functions implemented by the disk controller 14 will be described in more detail below. [Table Holding Function] The table holding function capable of holding a plurality of group IDs is realized by the group ID holding unit 16 and the control memory 25 of the disk control device 14. Specifically, one group ID can be held for each access path to the magnetic disk devices 12-1 and 12-2.

For example, as shown in FIG. 5, the guest VM 10
It is assumed that the magnetic disk device 12-1 with the number DEV-1 is assigned to -1 and the magnetic disk device 12-1 with the number DEV-2 is assigned to the guest VM 10-2. In addition, the group ID of the guest VM 10-1 = A, the guest VM 1
Group ID of 0-2 = B. In this case, as shown in FIG. 6, the channel adapter 2 of the disk controller 14
In the tables indicated by the numbers CA1 and CA2 of 4-1 and 44-2, the glue ID = in the access paths 111 and 112.
A is held, and access paths 221 and 222 hold group ID = B.

[Group forming function] Among the set group IDs, the access paths having the same group ID are regarded as the same group and are formed into a group. In the case of FIG. 6, two access paths 111 and 221 to the magnetic disk device 12-1 assigned to the guest VM 10-1
One group is formed by a group of the same group ID = A owned by. Further, two access paths 112 and 222 to the magnetic disk device 12-2 assigned to the guest VM 10-2 are provided.
Another group is formed by the group having the same group ID = B held by.

[Group setting error notification function] When a group ID has already been set in a certain access path, an error is responded to in response to a request for setting a different group ID. [Effective input / output function by group formation] Guest VM
When a channel command word (CCW) corresponding to an input / output instruction from 10-1 or 10-2 is received, an access path formed with a group having the same group ID is recognized, and the input realized by the group formation is realized. Enable the output function. As described above, the input / output functions that are enabled by the group formation include the dynamic route reconnection function and the expanded reserve function.

[Clear Function] A VM group monitor 2 is provided with a group ID clear command for clearing a specific group ID.
When 2 issues a group ID clear command, the group ID specified by the command is selected and cleared from the plurality of set group IDs. When the group ID is cleared by this group ID clear command, it returns to the initial state where the group ID is not set.

The other functions of the disk controller 14 operate without being affected by the provision of these functions. Next, the function of the clear processing unit 34 is newly added to the VM monitor 22 in order to realize the input / output control of the present invention. When the following conditions are obtained, the clear processing unit 34 causes the channel attenuators 24-1 and 24-24.
The specific group ID set for each 2 is cleared.

[Condition 1] Guest VMs 10-1 and 10-2
When removing the disk control device 14 assigned to the guest VM 10-1 from the assignment target, specifically, when the operator instructs the I / O device attachment changing unit 36 to end the guest VMs 10-1 and 10-2, or the guest VM 10-1. , 10-2
When there is an instruction to remove the channel from, the set specific group ID is cleared.

[Condition 2] When the OS on the virtual computer system receives a clear instruction command for resetting the channel device by an I / O command issued to the instruction emulation unit 38, the set specific group ID is cleared. To do. The processing operation of FIG. 4 will be described below.

FIG. 7 is a flow chart showing the processing operation of the VM monitor 22. First, when you start the virtual machine,
In step S1, the VM monitor 22 allocates the magnetic disk devices 12-1 and 12-2 to the guest VMs 10-1 and 10-2. Subsequently, the guest VM 10-from the VM monitor 22
1, 10-2 operation start instruction, specifically, the operator instructs the guest VM 10-1 or 10-2 IPL, and the operation shown in the flowchart of FIG. 8 is started.

Each of the guest VMs 10-1 and 10-2 is
In the step S2 after the initialization of the step S1 in the flowchart of FIG. 8, the guest VMs 10-1 and 10
-2 operating system (OS)
As the group ID setting process of the channel device 16-1
A group ID setting command is issued to the disk controller 14 via the.

This group ID setting command is, for example, as shown in FIG.
It has a form in which the group IDs shown in are chained. Subsequently, when the OS operating on the guest VM 10-1 or 10-2 determines an input / output request to the magnetic disk device 12-1 or 12-2 in step S3, an input / output command is issued in step S4 to the channel device 16-1 or. It is issued to the disk controller 14 via 16-2, and in step S4, a series of input / output requests are executed after waiting for a read or write completion response of the disk device 12-1 or 12-2. This process is continued until a system stop such as an operation stop is determined in step S6.

Such guest VM 10-1 or 10-
The VM monitor 22 does not intervene in the input / output command No. 2 of 2 and executes the input / output processing for the magnetic disk device 12-1 using the access paths 111, 211 specified by the group ID. On the other hand, in the VM monitor shown in FIG. 7, after instructing the allocation of the magnetic disk device to the guest VM,
In step S2, the guest VM 10-1 by the operator,
It is determined whether or not there is a termination instruction in 10-2, whether or not there is a channel removal instruction in step S3, and further in step S4 whether or not there is a channel reset command issued by the OS. Then, the process proceeds to step S5.

In step S5, the VM monitor 22
Is a channel adapter 24-1 of the disk controller 14,
Applicable guest V from the table held for each 24-2
The group ID set by M is read, and the group I
Designate D and issue a group ID clear command to the disk controller 14. This group ID clear command has a format in which group IDs are chained as shown in FIG. In response to this group ID clear command, the clear unit 18 of the disk control device 14 clears the group ID designated by the VM monitor 22 from the table.

FIG. 11 is an explanatory view showing the processing function of the input / output control according to the second invention of the present application. In the second invention, the input / output in which one magnetic disk device is shared by a plurality of guest VMs. Target morphology. Since the hardware of the virtual computer system to which the input / output control of the second invention is applied is the same as that of FIG. 3, FIG. 11 shows the function of each unit corresponding to the hardware configuration of FIG. .

In FIG. 11, the guest VMs 10-1 and 1
0-2 are realized by a plurality of operating systems controlled by the VM monitor 22, and the guest VM 10
Group ID = A is assigned to -1. In addition, the group ID = B is assigned to the guest VM 10-2. The guest VMs 10-1 and 10-2 are coupled to the disk controller 14 via two physical access paths passing through the channel devices 16-1 and 16-2.

The disk controller 14 is provided with channel adapters 24-1 and 24-2 corresponding to two access paths, and the magnetic disk device 12-1 is connected via the channel adapters 24-1 and 24-2. Connected by two physical access paths. Here, the magnetic disk device 12-1
Are allocated to both the guest VMs 10-1 and 10-2, and the guest VMs 10-1 and 10-2 share the magnetic disk device 12-1. Therefore, with respect to the physical access path 111 passing through the channel device 16-1 and the channel adapter 24-1 for the magnetic disk device 12-1,
The guest VMs 10-1 and 10-2 are logical access paths 11
Input / output processing is executed using 11,111.

The controller 26 provided in the disk controller 14 has a holding unit 1 realized by program control.
6, in addition to the functions of the clear unit 18 and the input / output execution unit 20, in the second invention, exclusive control is performed when the magnetic disk device 12-1 is shared by the two guest VMs 10-1 and 10-2. An exclusive control unit 40 is provided. The guest VMs 10-1 and 10 are stored in the control memory 25 of the controller 26.
-2 for one input / output request using the logical access paths 1111 and 1111 from one magnetic disk device 12-
Guest VM10 to enable exclusive control for 1
-1, 10-2 logical access paths 1111 and 21
It is provided with a table for converting 11 into a corresponding physical access path 111.

Therefore, the guest VM 10-1 or 10
-2, an exclusive control for the shared magnetic disk device 12-1 can be realized by converting the logical access path associated with the input / output request from the -2 to the physical access path by referring to the table. Further, in the table expanded in the control storage 25, the guest VMs 10-1, 1 are stored in the group ID holding unit 16.
The group ID is set based on the group ID setting command issued by each of 0-2. The setting of this group ID is held for each logical access path provided in the table.

Further, in FIG. 11, the channel device 16 is used as an access path to the magnetic disk device 12-1.
-2, another physical access path 221 passing through the channel adapter 24-2 is provided, and in order to realize the extended reserve function and the dynamic reconnection function by group formation, the guest VM 10-1, 10
-2, the logical access paths 1221 and 2221 are allocated, conversion from the logical access path to the physical access path and the setting of the group ID for each logical access path are performed in the table of the control storage 25 similarly to the physical access path 111 side. There is.

FIG. 12 shows the virtual machine VM1 in FIG.
The allocation of the magnetic disk device 12-1 to 0-1 is shown, and the magnetic disk device 12-1 indicated by the number DEV-1 is shared by being allocated to both the guest VMs 10-1 and 10-2. . FIG. 13 is an explanatory diagram of a table expanded in the control storage 25 of the controller 26, which shows the channel adapter 24-of the disk controller 14.
Channel adapter numbers CA1 and C determined by 1, 2-4
Physical access paths 111 and 211 using A2 as an index
21 is stored.

The second invention is basically based on the assumption that one physical access path is used and shared by a plurality of guest VMs. Therefore, for example, the channel adapter number CA1 is used.
Taking the physical access path 111 of No. 2 as an example, two physical access paths 111 and 1111 of the guest VMs 10-1 and 10-2 that access the magnetic disk device 12-1 using this physical access path 111 are stored. By referring to the logical access path, the corresponding physical access path can be known.

For the logical access path 1111, the group ID = A is set, and the guest VM 10-1
It indicates that the access path belongs to. Also,
Group ID = B is set in the logical access path 2111, indicating that the logical access path belongs to the guest VM 10-2. The group formation by the group ID is performed by holding the group ID = A and B for the logical access paths 1221 and 2221 from the guest VMs 10-1 and 10-2 corresponding to the physical access path 221 indicated by the channel number CA2, respectively. Will be realized.
By referring to the table holding such a group ID, the logical access path 11 having the same group ID
It can be recognized that 11 and 1221 form the same group, and that the logical access paths 2111 and 2221 form another same group.

By forming this group, as in the first invention,
When the reserve command is received, the extended reserve function of reserving the input / output device between the access paths having the same group ID can be realized. When a seek command is issued and the magnetic disk device 12-1 is disconnected and then a reconnection request is received, when the original physical access path is in a busy state, it corresponds to another logical access path included in the same group. It is possible to realize a dynamic route reconnection function by recognizing a physical access path.

Further, in the table shown in FIG.
Since two guest VMs perform input / output using one logical access path for one physical access path, an occupancy flag is provided to indicate the acquisition state of the physical access path, and the occupancy flag is set to 1. When the physical access path is in use, the physical access path is in use, and when the occupancy flag is reset to 0, it indicates that the physical access path is free.

The exclusive control unit 40 provided in the controller 26 of FIG. 11 converts a logical access path into a physical access path and then checks the setting and resetting of the occupation flag to acquire the physical access path or wait for acquisition. Become. In the second invention of FIG. 11, the case where the single magnetic disk device 12 is shared by the two guests 10-1 and 10-2 is taken as an example, but even if there are a plurality of magnetic disk devices. Good.

In the hardware configuration of FIG. 2,
One disk controller 14 and two channel devices 16
Although the input / output configuration in which -1, 16-2 are combined has been taken as an example, the numbers of disk control devices and channel devices are appropriately determined according to the scale of the subsystem. Further, although the magnetic disk device is taken as an example of the input / output device in the above-mentioned embodiment, the input / output device is not limited to this, and includes an input / output device such as an optical disk device or a magnetic tape device.

Although the multiprocessor system is taken as an example, a single processor system may also be used.
The number of guest VMs realized by the VM monitor is also arbitrary.

[0066]

As described above, according to the present invention, since the function of the input / output control device can be provided to a plurality of guest VMs, the performance and the reliability of the guest VM regarding the input / output execution can be improved. be able to. In addition, the intervention process for the input / output instruction by the VM monitor is not required, and V
It is possible to reduce the overhead of the M monitor and improve the system performance.

[Brief description of drawings]

FIG. 1 is an explanatory view of the principle of the first invention.

FIG. 2 is an explanatory view of the principle of the second invention.

FIG. 3 is a configuration diagram of an embodiment showing a hardware configuration of the present invention.

FIG. 4 is an explanatory view showing a processing function of input / output control according to the first invention.

FIG. 5 is an explanatory view of the allocation of the magnetic disk device to the guest VM of the first invention.

FIG. 6 is an explanatory diagram of a table showing the correspondence between access paths and group IDs held in the disk control device of the first invention.

FIG. 7 is a flowchart showing the processing operation of the VM monitor of FIG. 4 regarding input / output.

8 is a flowchart showing the input / output processing of the guest VM of FIG.

FIG. 9 is an explanatory diagram of a command format of a group ID setting instruction issued by the guest VM.

FIG. 10 is a group ID issued based on a VM monitor
Illustration of command format of clear instruction

FIG. 11 is an explanatory view showing a processing function of input / output control according to the second invention.

FIG. 12 is an explanatory diagram of the allocation of the magnetic disk device to the guest VM of the second invention.

13 is an explanatory diagram of a table showing correspondence between access paths and group IDs held in the disk control device of FIG. 11.

FIG. 14 is an explanatory diagram of conventional input / output control in which a magnetic disk device is assigned to the guest VM in a one-to-one manner.

FIG. 15 is an explanatory diagram of conventional input / output control in which one guest disk is shared by a plurality of guest VMs.

[Explanation of symbols]

 10-1, 10-2: Guest virtual computer (guest VM) 12-1, 12-2: Input / output device (magnetic disk device) 14: Input / output control device (disk control device) 16-1, 16-2: Channel device 16: Holding unit (holding unit) 18: Clearing unit (clearing unit) 20: Input / output execution unit 22: Virtual computer monitor program (VM monitor) 24-1, 24-2: Channel adapter 25: Control storage 26: Controller 28: Main memory control unit (MCU) 30-1 to 30-n: CPU 32: Main memory unit (MSU) 34: Group ID clear processing unit 36: IO device allocation changing unit 38: Instruction emulation unit 40: Exclusive control unit

Claims (28)

[Claims] 1. A plurality of input / output devices (12-1, 12-1) for each of a plurality of guest virtual computers (10-1, 10-2) realized by a virtual computer monitor program (22) for controlling a virtual computer system. 1 of any one of 12-2)
An allocation process for allocating one to one; based on the result of the allocation process, the plurality of guest virtual computers (10-1, 10-).
2), the input / output device (1) via a plurality of channel devices (16-1, 16-2) and an input / output control device (14).
2-1 and 12-2) to access paths (11
1, 112, 221, 222) and a group ID holding process of holding a group ID set by each of the guest virtual computers (10-1, 10-2) in a table in the input / output control device (14). The virtual computer (10-1,
10-2), when the input / output command issued by any of 10-2) is accepted by the input / output control device (14), a plurality of access paths leading to the input / output device designated by the command are referred to by referring to the table. And an input / output execution process of detecting an access path belonging to the same group and executing input / output, and an input / output control method for a virtual computer system. 2. The input / output control method for a virtual computer system according to claim 1, wherein the group ID holding process is performed by an input / output device (12-1, 12-2) by a virtual computer monitor program (22). The guest virtual computer (10-1, 10-2) is started based on the allocation result, and the operating system (O) operating on the virtual computer is started.
An input / output control method for a virtual computer system, wherein the group ID is set by the group ID setting process of S). 3. The virtual computer system input / output control method according to claim 1, further comprising clear means (18) provided in said input / output control device (14) in accordance with an instruction from a virtual computer monitor program (22). Is provided with a clearing process for clearing a specific group ID, and an input / output control method for a virtual computer system. 4. The input / output control method for a virtual computer system according to claim 3, wherein the clearing step is performed by the virtual computer monitor program (22) to input to the guest virtual computer (10-1, 10-2). Output device (12-
1, 12-2), the group used by the guest virtual computer (10-1, 10-2) by instructing the clearing means (18) of the input / output control device (14) to clear when the allocation is changed. An input / output control method for a virtual computer system, characterized by clearing an ID. 5. The input / output control method for a virtual computer system according to claim 1, wherein the group ID holding step is performed by the plurality of channel devices (16-1, 16-2) provided in the input / output control device (14). 16-1) An input / output control method for a virtual computer system, comprising a table for setting a plurality of the group IDs for each. 6. The virtual computer system I / O control method according to claim 1, wherein the I / O execution process uses the access paths belonging to the same group detected by referring to the table. An input / output control method for a virtual computer system characterized by executing processing. 7. An input / output control method for a virtual computer system according to claim 1, wherein said input / output device (12-
1, 12-2) is a magnetic disk device, and the input / output control device (14) is a disk control device, and an input / output control method for a virtual computer system. 8. A plurality of guest virtual computers (10-1, 10-2) realized by a virtual computer monitor program (22) for controlling a virtual computer system; and a plurality of guest virtual computers (10-1, 10). -2), each of the plurality of input / output devices (12-1, 12-2) assigned to each of the plurality of input / output devices (12-1, 12-2) and at least one of the plurality of input / output devices (12-1, 12-2). An I / O controller (14) coupled by two paths, and at least two channel devices (16) coupling the I / O controller (14) to the plurality of guest virtual computers (10-1, 10-2). -1, 16-2) and the input / output control device (14) from the guest virtual computer (10-1, 10-2) to the channel device (16-1, 16-2) and the input / output control. The input / output device via the device (14) (12-1, 12-
2) multiple access paths (111, 112, 22)
1, 222) for each guest virtual machine (10-1,
10-2) group ID holding means (16) for holding the group ID set in each table in the table, and clearing means (18) for clearing the specific group ID held in the table of the group ID holding means (16)
And when an input / output instruction issued by any of the virtual machines (10-1, 10-2) is received, the input / output designated by the instruction by referring to the table of the group ID holding means (16) An input / output control device for a virtual computer system, comprising: an input / output execution means (20) for detecting an access path belonging to the same group from a plurality of access paths to the device and executing input / output. . 9. An input / output control device for a virtual computer system according to claim 8, wherein said group ID holding means (1)
6) starts the guest virtual computer (10-1, 10-2) based on the allocation result of the input / output device (12-1, 12-2) by the virtual computer monitor program (22), and the virtual computer Group ID by the group ID setting process of the operating system (OS) running on
An input / output control device for a virtual computer system, characterized by receiving the setting of. 10. The input / output control device for a virtual computer system according to claim 8, wherein the clearing means (18) provided in the input / output control device (14) is instructed by a virtual computer monitor program (22). An input / output control device for a virtual computer system, which clears a specific group ID. 11. The input / output control device of a virtual computer system according to claim 10, wherein the virtual computer monitor program (22) is a guest virtual computer (10) of the input / output device (12-1, 12-2). -1, 10-2) when changing the allocation to the guest virtual computer (10-1, 10-2)
An input / output control device for a virtual computer system, characterized by instructing a clearing means (18) of the input / output control device (14) to clear the group ID used by the virtual computer system. 12. An input / output control device for a virtual computer system according to claim 8, wherein said input / output control device (14) has said group ID for each of said plurality of channel devices (16-1, 16-1). An input / output control device for a virtual computer system, wherein a table for setting a plurality of items is provided. 13. An input / output control device for a virtual computer system according to claim 8, wherein said input / output execution means (20).
Is an input / output control device for a virtual computer system, which executes input / output processing using two or more access paths designated by a group ID obtained from the table of the holding means (16). 14. An input / output control device for a virtual computer system according to claim 8, wherein said input / output device (12)
-1, 12-2) are magnetic disk devices, and the input / output control device (14) is a disk control device, and an input / output control device for a virtual computer system. 15. A channel device (16-1) and an input / output control device for a plurality of guest virtual computers (10-1, 10-2) realized by a virtual computer monitor program (22) for controlling a virtual computer system. An allocation step of commonly allocating one input / output device (12-1) connected by at least one physical access path (111) and two logical access paths (1111, 2111) via (14);
Based on the result of the allocation process, the logical access path (1
111, 111) and the physical access path (111)
With the logical access path (111
The guest virtual computer (10-
1, 10-2) holds the group ID set by each of them in a table in the input / output control device (14).
Holding process; when the input / output controller (14) receives an input / output instruction issued by any of the virtual computers (10-1, 10-2), the logical access path is determined by referring to the table. An exclusive control process for converting a physical access path to control contention of the physical access path; and the input / output device (12-1) based on a control result of the exclusive control process.
And an input / output execution process for executing an input / output instruction for the virtual computer system. 16. A virtual computer system input / output control method according to claim 15, wherein the group ID holding process is based on a result of assignment of the input / output device (12-1) by the virtual computer monitor program (22). The virtual machine system is characterized in that the guest virtual machine (10-1, 10-2) is started up and a group ID is set by a group ID setting process of an operating system (OS) operating on the virtual machine. I / O control method. 17. The input / output control method for a virtual computer system according to claim 15, further comprising the input / output control device (1) according to an instruction from a virtual computer monitor program (22).
Clearing means (18) provided in 4) has a specific group ID
An input / output control method for a virtual computer system, which is characterized in that a clearing process for clearing is provided. 18. The input / output control method for a virtual computer system according to claim 17, wherein in the clearing step, the input / output device (12) for the guest virtual computer (10-1) by the virtual computer monitor program (22). -1) when changing the allocation, the clearing means (18) of the input / output control device (14) is instructed to clear and the guest virtual computer (1)
0-1, 10-2) clears the group ID used by the input / output control method of the virtual computer system. 19. A virtual computer system input / output control method according to claim 15, wherein said group ID holding step sets said group ID for each of said plurality of channel devices (16-1, 16-1). I / O control method for a virtual computer system, characterized in that a table is provided. 20. An input / output control method for a virtual computer system according to claim 15, wherein the guest virtual computer (10
-1, 10-2) has a plurality of different input / output devices (1
2-1 and 12-2) are commonly assigned, the input / output execution process executes input / output processing using one or a plurality of physical access paths designated by the group ID obtained from the table. An input / output control method for a virtual computer system, comprising: 21. An input / output control method for a virtual computer system according to claim 15, wherein said input / output device (1
2-1 and 12-2) are magnetic disk devices, and the input / output control device (14) is a disk control device, and an input / output control method for a virtual computer system. 22. A plurality of guest virtual computers (10-1, 10-2) realized by a virtual computer monitor program (22) for controlling a virtual computer system; and a plurality of guest virtual computers (10-1, 10). -2), one input / output device (12-1) commonly assigned to the input / output device, and an input / output control device (14) coupled to the input / output device (12-1) by one physical access path (111). , At least one channel device (16-1) coupled to the plurality of guest virtual computers (10-1, 10-2) by a plurality of logical access paths (1111, 111) via the input / output control device (14) ) And the logical access path (1111, 2) instructed to the input / output control device (14) by an input / output command from the guest virtual computer (10-1, 10-2).
111) is converted into a physical access path (111), and a plurality of logical access paths (1111) from the guest virtual computers (10-1, 10-2) to the input / output devices (12-1, 12-2) are converted. , 2111) for each of the guest virtual computers (10-1, 10-2), and a table of the group ID holding means (16) for holding the group ID set in the table in the table. Clearing means (18) for clearing the specific group ID held in
When an input / output instruction issued by any of the guest virtual computers (10-1, 10-2) is accepted, the logical access path is changed to the physical access path (by referring to the table of the group ID holding means (16). 111) and an exclusive control means (40) for controlling access conflict, and an input / output device for executing an input / output command to the input / output device (12-1) based on a control result of the exclusive control means (40). An input / output control device for a virtual computer system, comprising: output execution means (20). 23. The input / output control device for a virtual computer system according to claim 22, wherein the input / output control device (14).
The group ID holding means (16) provided in the virtual computer monitor program (22)
2-1) Starting the guest virtual machines (10-1, 10-2) based on the allocation result, and operating system (OS) group I operating on the virtual machines
An input / output control device for a virtual computer system, wherein the setting of a group ID is received by D setting processing. 24. The input / output control device of the virtual computer system according to claim 22, wherein the input / output control device (14)
An input / output control device for a virtual computer system, characterized in that a clearing means (18) provided in (3) clears a specific group ID in accordance with an instruction from a virtual computer monitor program (22). 25. An input / output control device for a virtual computer system according to claim 24, wherein said virtual computer monitor program (22) is a guest virtual computer (10-1, 10) of said input / output device (12-1). -2) When changing the assignment to
In order to clear the group ID used by the guest virtual computer (10-1, 10-2), the clearing means (18) of the input / output control device (14) is instructed to perform the clearing. Input / output control device for computer system. 26. The input / output control device of the virtual computer system according to claim 22, wherein said input / output control means (14)
Is an input / output control device for a virtual computer system, wherein a table for setting a plurality of the group IDs is provided for each of the plurality of channel devices (16-1, 16-1). 27. An input / output control device for a virtual computer system according to claim 22, wherein said input / output execution means (20).
Is obtained from the table of the group ID holding means (16) when a plurality of input / output devices (12-1, 12-2) are assigned to each of the guest virtual computers (10-1, 10-2). An input / output control device for a virtual computer system, wherein input / output processing is executed using two or more physical access paths having the same group ID. 28. An input / output control device for a virtual computer system according to claim 22, wherein said input / output device (1
2-1 and 12-2) are magnetic disk devices, and the input / output control device (14) is a disk control device, which is an input / output control device of a virtual computer system.