JPH10247147A - Virtual computer system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the virtual computer system which can be improve performance of the system by informing a semaphore on a virtual computer directly of the end event of an asynchronous transfer instruction on the virtual computer. SOLUTION: A host machine 20 is provided with an additional information setting part 21 which sets additional information regarding the issue origin of an asynchronous transfer instruction and an additional information judgement part 22 which specifies an asynchronous transfer instruction corresponding to data and an end even transferred from an extended storage device 30 and judges the contents of the additional information set for the asynchronous transfer instruction specified by the additional information setting part 21, and informs a semaphore on the virtual computer 10 directly of the end event of data transfer to the asynchronous transfer instruction when the asynchronous transfer instruction is issues by the virtual computer 10 corresponding to the contents of the the additional information judged by the additional information judgement part 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a virtual computer system for realizing a plurality of virtual computers as logical computers on one computer, and more particularly, to an asynchronous transmission command between an extended storage device and a main storage device. The present invention relates to a virtual machine system for improving performance by speeding up the end event report.

[0002]

2. Description of the Related Art A virtual computer system realizes a plurality of virtual computers as logical computers on one computer, and independently runs an operating system on each virtual computer under the control of a virtual computer control program. Is possible.

Conventionally, an asynchronous transfer instruction for an extended storage device in a virtual machine has been executed by simulation in a host machine. Then, the notification of the end event when the asynchronous transfer instruction ends has been made to the semaphore on the host machine.

[0004] The notification of the end event to the virtual machine is performed by notifying the semaphore on the host machine again to the semaphore on the virtual machine by software simulation.

A conventional virtual computer system of this type is disclosed in, for example, Japanese Patent Application Laid-Open No. 2-54352,
There are systems disclosed in JP-A-123439 and JP-A-2-310648. In these conventional virtual machine systems, the end event of the asynchronous transfer instruction on the virtual machine is notified to the semaphore on the host machine, so that the process of reporting the end event to the virtual machine must be performed by software simulation. .

[0006]

As described above, the conventional virtual machine system reports the end event of the asynchronous transfer instruction on the virtual machine to the semaphore on the host machine, and thus reports the end event to the virtual machine. The processing has to be performed by software simulation, which has the drawbacks that efficiency is poor and system performance is reduced.

[0007] The present invention solves the above-mentioned drawbacks of the prior art and makes it possible to notify the end event of an asynchronous transfer instruction on a virtual machine directly to a semaphore on the virtual machine.
It is an object of the present invention to provide a virtual computer system capable of improving system performance.

[0008]

SUMMARY OF THE INVENTION The present invention, which achieves the above object, is a virtual computer system for realizing a plurality of virtual machines, which are logical computers which operate asynchronously on one computer. An additional information setting means for setting, in response to an asynchronous transfer instruction to an extended storage device issued from the virtual machine or the host machine, additional information relating to the source of the asynchronous transfer instruction, Additional information for identifying an asynchronous transfer instruction corresponding to data and an end event transferred from the extended storage device and determining the content of the additional information set for the asynchronous transfer instruction identified by the additional information setting means Determining means for determining whether or not the asynchronous transfer instruction is transmitted in accordance with the content of the additional information determined by the additional information determining means. If the one issued by the virtual computer, the end event of the data transfer to the asynchronous transfer instruction, and notifies directly semaphores on the virtual machine.

In the virtual machine system according to the present invention, the additional information set by the additional information setting means with respect to the asynchronous transfer instruction may be determined by determining whether the asynchronous transfer instruction has been issued from the virtual computer. And when the asynchronous transfer instruction is issued from the virtual machine,
Second identification data for identifying the virtual machine that is the issuer, and a semaphore address that is a notification destination of an end event in the virtual machine when the asynchronous transfer instruction is issued from the virtual machine. It is characterized by including.

In the virtual machine system according to the present invention, the additional information determining means determines that the end event received from the extended storage device is for an asynchronous transfer instruction issued by the virtual computer. In this case, the host machine specifies the virtual machine that has issued the asynchronous transfer instruction based on the first identification data for identifying the virtual machine extracted by the additional information determination unit, and specifies the specified virtual machine. The main memory space of the virtual machine can be accessed, and the termination event is notified to a semaphore pointed to by the semaphore address extracted by the additional information determination unit.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a virtual computer system according to one embodiment of the present invention.

As shown in the figure, the virtual machine system of this embodiment includes a virtual machine (VM) 10 and a host machine (B).
M) 20 and an extended storage device (EMU) 30.
In FIG. 1, only the characteristic configuration of the present embodiment is described, and the description of other general configurations is omitted.

The host machine 20 has an additional information setting unit 21 for setting, in response to the asynchronous transfer instruction issued by the virtual machine 10 or the host machine 20, additional information which is information relating to the source of the asynchronous transfer instruction, and an extended storage. An additional information determining unit for identifying an asynchronous transfer instruction corresponding to the data transferred from the device and an end event and determining the content of the additional information; Then, the data transferred from the extended storage device 30 is processed in accordance with the content of the additional information 22, and an end event is reported to the virtual machine 10 if necessary.
Send to

The additional information includes at least flag data indicating whether the asynchronous transfer instruction is issued from the virtual machine 10 or the host machine 20;
When the asynchronous transfer instruction is issued from the virtual machine 10, identification data (VM number) for identifying the virtual machine 10 that is the issuing source, and a semaphore address that is a notification destination of the end event in the virtual machine 10 And FIG. 2 shows an example of the additional information. In FIG. 2, ELC
The flag data is stored in the TVM 101, and the ELCTNUM
A VM number is stored in 102 and a semaphore address is stored in ELCTSMA 103.

Next, the operation of this embodiment will be described with reference to the flowcharts of FIGS.

First, the extended storage device 3 on the virtual machine 10
A case where an asynchronous transfer instruction between 0 and the main storage device is executed will be described. Note that, in this operation example, ELC which is additional information
TVM (x), ELCTNUM (x), ELCTSMA
In (x), x = b when the asynchronous transfer instruction is issued from the virtual machine 10, and x = a when the asynchronous transfer instruction is issued from the host machine 20. Also, when the asynchronous transfer instruction is issued by the virtual machine 10, ELCTVM1
01 is set to “1”, and flag data stored in the ELCTVM 101 when issued by the host machine 20 is set to “0”.

When the software running on the virtual machine 10 executes the asynchronous transfer command (step 301 in FIG. 3), the hardware or firmware for realizing the present embodiment determines whether the virtual machine 10 is operating. Is determined (step 302). Since the virtual machine 10 has executed the asynchronous transfer instruction, it is determined in step 302 that the virtual machine 10 is operating. Then, the hardware or firmware requests a simulation for software operating on the host machine 20 (step 303).

When the host machine 20 receives the asynchronous transfer instruction simulation request from the virtual machine 10, the host machine 20 starts the simulation (step 30).
3). Then, the additional information setting unit 21 sets additional information for the asynchronous transfer instruction (step 30).
4). That is, the flag data “1” indicating that the virtual machine 10 has issued it to the ELCTVM (b) 101
To the virtual computer 10 in the ELCTNUM (b) 102.
And the semaphore address of the notification destination of the end event in the virtual machine is stored in the ELCTSMA (b) 103. After the above processing, a request for transferring desired data is made to the extended storage device 30.

When a data transfer request is sent from the host machine 20 to the extended storage device 30, readout and transfer of target data are started in the extended storage device 30, and when the data transfer is completed, the extended storage Device 30
Notifies the host machine 20 of the termination event.

When receiving the end event from the extended storage device 30, the host machine 20 specifies the asynchronous transfer instruction corresponding to the end event, that is, the asynchronous transfer instruction that requested the data transfer (step 401 in FIG. 4). . Then, the additional information determining unit 22 checks the additional information set in the asynchronous transfer instruction (step 402). Here, since the asynchronous transfer instruction has been issued by the virtual machine 10, ELCTVM (b) = "1". Then, next, the host machine 20 performs a process of notifying the semaphore of the corresponding virtual machine 10 of the end event.

That is, first, the additional information ELCTNU
Virtual machine 1 having a VM number stored in M (b)
0 for the virtual machine 10
(Step 4)
03). Then, the semaphore address of the semaphore of the virtual machine 10 is extracted from the additional information ELCTSMA (b) (step 404), and an end event is notified to the semaphore indicated by the semaphore address (step 405).
After that, the host machine 20 converts the address space of the host machine 20 itself into a state where the main storage space of the host machine 20 can be accessed.

As described above, the termination event for the asynchronous transfer instruction issued from the virtual machine 10 can be performed without passing through the simulation in the host machine 20.
The semaphore of the virtual machine 10 is notified directly.

Next, a case where an asynchronous transfer instruction between the extended storage device 30 and the main storage device is executed on the host machine 20 will be described.

When the software running on the host machine 20 executes the asynchronous transfer instruction (step 301 in FIG. 3), the hardware or firmware for realizing this embodiment determines whether or not the virtual machine 10 is operating. Is determined (step 302). Here, the host machine 20
Executed the asynchronous transfer instruction, so that step 3
In 02, it is determined that the virtual machine 10 is not operating.
Then, the host machine 20 uses the additional information setting unit 21 to set additional information for the asynchronous transfer instruction (step 306). That is, ELCTVM (a) 1
01 is stored with flag data “0” indicating that it has been issued by the host machine 20. Nothing is stored in ELCTNUM (a) and ELCTSMA (a). After the above processing, a request for transferring desired data is made to the extended storage device 30.

When a data transfer request is sent from the host machine 20 to the extended storage device 30, reading and transferring of target data is started in the extended storage device 30, and when the data transfer is completed, the extended storage Device 30
Notifies the host machine 20 of the termination event.

When receiving the end event from the extended storage device 30, the host machine 20 specifies the asynchronous transfer instruction corresponding to the end event, that is, the asynchronous transfer instruction that requested the data transfer (step 401 in FIG. 4). . Then, the additional information determining unit 22 checks the additional information set in the asynchronous transfer instruction (step 402). Here, since the asynchronous transfer instruction has been issued by the host machine 20, ELCTVM (a) = "0". Therefore, the host machine 20
A process of notifying the semaphore of 0 of the end event is performed (steps 407 and 408).

Although the present invention has been described with reference to the preferred embodiments, the present invention is not necessarily limited to the above embodiments.

[0029]

As described above, the virtual machine system of the present invention sets additional information on the source of the asynchronous transfer request for the asynchronous transfer request issued by the virtual machine, and terminates the data transfer. Then, based on the additional information, a search is made for the virtual machine that is the source of the asynchronous transfer request, and the semaphore of the virtual machine is notified of the end event directly. Therefore, when notifying the end event, it is not necessary to notify the semaphore on the virtual machine again from the semaphore on the host machine via the simulation on the host machine, so that the process of reporting the end event to the virtual machine is performed at high speed. This has the effect of preventing a decrease in system performance.

Further, since the process of reporting the end event to the virtual machine is performed without going through the simulation in the host machine, it can be separated from the main process in the host machine. As a result, if the priority of the main processing in the host machine is set high, the main processing can be executed with priority, thereby avoiding a decrease in the performance of the host machine and improving the processing efficiency of the entire system. Can be done.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a virtual computer system according to one embodiment of the present invention.

FIG. 2 is a diagram showing an example of additional information according to the embodiment.

FIG. 3 is a flowchart showing the operation of the present embodiment, showing the operation from execution of an asynchronous transfer instruction to issuing a transfer request to an extended storage device.

FIG. 4 is a flowchart showing the operation of the embodiment, and is a diagram showing a process of reporting an end event after the end of transfer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Virtual machine 20 Host machine 21 Additional information setting part 22 Additional information judgment part 30 Extended storage device

Claims (3)

[Claims] 1. A virtual machine system for realizing a plurality of virtual machines which are logical machines which operate asynchronously on one machine, wherein a host machine supporting the virtual machine is the virtual machine or the host machine. Issued by
Additional information setting means for setting additional information relating to the issue source of the asynchronous transfer instruction for the asynchronous transfer instruction to the extended storage device; And additional information determining means for determining the content of the additional information set for the asynchronous transfer instruction specified by the additional information setting means, wherein the content of the additional information determined by the additional information determining means is provided. Wherein, if the asynchronous transfer instruction is issued by the virtual machine, a data transfer end event for the asynchronous transfer instruction is directly notified to a semaphore on the virtual machine. Computer system. 2. The additional information set for the asynchronous transfer instruction by the additional information setting means indicates whether the asynchronous transfer instruction is issued from the virtual machine or issued from the host machine. When the asynchronous transfer instruction is issued from the virtual machine, second identification data for identifying the issuing virtual machine, and the asynchronous transfer instruction is issued from the virtual machine. 2. The virtual machine system according to claim 1, further comprising a semaphore address to which the virtual machine is notified of an end event. 3. When the additional information determining unit determines that the end event received from the extended storage device is for an asynchronous transfer instruction issued by the virtual machine, the host machine executes the additional process. On the basis of the first identification data for identifying the virtual machine extracted by the information judging means, the virtual machine that has issued the asynchronous transfer instruction is specified, and the main storage space of the specified virtual machine can be accessed. 3. The virtual computer system according to claim 2, wherein the semaphore pointed to by the semaphore address extracted by the additional information determination unit is notified of the end event.