CN113886017A

CN113886017A - Virtualization method of industrial interface, virtual machine communication method and system

Info

Publication number: CN113886017A
Application number: CN202111176597.1A
Authority: CN
Inventors: 贾立平; 王猛; 吴瑞; 赵井达
Original assignee: Shandong Qianyun Qichuang Information Technology Co ltd; Shandong Trusted Cloud Information Technology Research Institute
Current assignee: Shandong Qianyun Qichuang Information Technology Co ltd; Shandong Trusted Cloud Information Technology Research Institute
Priority date: 2021-10-09
Filing date: 2021-10-09
Publication date: 2022-01-04

Abstract

The invention discloses a virtualization method of an industrial interface, a virtual machine communication method and a system, comprising the following steps: on the host, the support of virtual industrialization interface equipment is added, so that the virtual industrialization interface equipment can be selected when the virtual machine is generated; and generating a virtual machine, wherein an application program in the virtual machine is communicated with a virtual industrialization interface, and the virtual industrialization interface is communicated with the Ethernet through network port conversion. Aiming at a computer applying a COM/CAN industrial interface, the invention CAN realize normal communication through COM/CAN without modifying an application program of a user during virtual migration; the compatibility of the application program from the physical machine to the virtual machine is ensured.

Description

Virtualization method of industrial interface, virtual machine communication method and system

Technical Field

The invention relates to the technical field of interface virtualization, in particular to a virtualization method of an industrial interface, a virtual machine communication method and a virtual machine communication system.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

With the development of cloud computing technology, more and more hardware computers are migrated to a cloud computing virtualization platform, which is a complete set of software and hardware environment that provides virtual machines to replace hardware PCs or hardware servers in a general sense. However, some early computers used in industrial fields communicate with each other through an industrial interface such as a serial port (i.e., COM port) or a CAN port for historical reasons. The current cloud computing virtualization platform communicates by using the Ethernet, and if the machine is directly migrated to the cloud computing virtualization platform, application program codes need to be modified and the machine communicates by using the Ethernet instead; this can result in inconvenience for the customer and risk for development.

With reference to fig. 1, in some industrial scenarios, conventional physical machines a and B communicate via a CAN interface or a COM interface. When the computers a and B migrate to the cloud computing virtualization platform, communication incompatibility may occur because the hosts of the common cloud computing virtualization platform are connected together through an ethernet network as shown in fig. 2; a virtual machine is started on the host machine for use by the guest. When migrating physical machines a, B to virtual machines C and D, it is clear that both are not able to directly CAN/COM communication.

Disclosure of Invention

In order to solve the problems, the invention provides a virtualization method of an industrial interface, a virtual machine communication method and a system, so that a virtual machine CAN communicate through COM/CAN without the need of modifying an application program by a user; thereby ensuring seamless migration of the user's machine.

In some embodiments, the following technical scheme is adopted:

a virtualization method of an industrial interface comprises the following steps:

on the host, the support of virtual industrialization interface equipment is added, so that the virtual industrialization interface equipment can be selected when the virtual machine is generated;

and generating a virtual machine, wherein an application program in the virtual machine is communicated with a virtual industrialization interface, and the virtual industrialization interface is communicated with the Ethernet through network port conversion.

In other embodiments, the following technical solutions are adopted:

a virtualized communication method, comprising:

the method is adopted to carry out virtualization of the industrial interface;

respectively starting a configuration thread and a forwarding thread by a server virtual machine and a client virtual machine;

the configuration thread of the client virtual machine receives broadcast data sent by the server virtual machine, selects and connects a corresponding server virtual machine, and sends local virtual industrial interface parameters to enable the server virtual machine to complete corresponding interface configuration;

after the configuration is completed, the forwarding thread of the client virtual machine is connected with the forwarding thread of the server virtual machine so as to establish a data transmission channel.

In other embodiments, the following technical solutions are adopted:

a virtualized communication system comprising:

the virtualization module is used for virtualizing an industrial interface;

the virtual machine configuration module is used for enabling the server virtual machine and the client virtual machine to respectively start a configuration thread and a forwarding thread; the configuration thread of the client virtual machine receives broadcast data sent by the server virtual machine, selects and connects a corresponding server virtual machine, and sends local virtual industrial interface parameters to enable the server virtual machine to complete corresponding interface configuration;

and the virtual machine connection module is used for connecting the forwarding thread of the client virtual machine with the forwarding thread of the server virtual machine after the configuration is completed so as to establish a data transmission channel.

In other embodiments, the following technical solutions are adopted:

a host with an industrial interface adopts the method to virtualize the industrial interface to generate a virtual machine; and performing communication between different virtual machine applications by adopting the virtualization communication method.

Compared with the prior art, the invention has the beneficial effects that:

(1) aiming at a computer applying a COM/CAN industrial interface, the invention CAN realize normal communication through COM/CAN without modifying an application program of a user during virtual migration; the compatibility of the application program from the physical machine to the virtual machine is ensured.

Additional features and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a schematic diagram of a conventional physical machine communicating via a CAN interface or a COM interface;

FIG. 2 is a schematic communication diagram after a computer is migrated to a cloud computing virtualization platform in the prior art;

FIG. 3 is a diagram illustrating a modification to a host during virtualization of the host according to an embodiment of the present invention;

FIG. 4 is a diagram illustrating a communication structure between virtual machines according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a data transmission process of the client virtual machine and the server virtual machine according to the embodiment of the present invention.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Example one

In one or more embodiments, a method of virtualization of an industrial interface is disclosed, comprising:

(1) on the host, the support of virtual industrialization interface equipment is added, so that the virtual industrialization interface equipment can be selected when the virtual machine is generated;

specifically, the host computer comprises:

the Qemu module is used for generating virtual industrial interface equipment for the virtual machine to use; devices such as a network card, a keyboard, a mouse and the like in the virtual machine are all generated by the Qemu module. The embodiment generates the virtual industrialized interface equipment through the Qemu module.

The libvirt module is used for providing a uniform calling interface so that the virtual machine can call the virtual industrialized interface equipment; because the Qemu module is complex to directly call, the libvirt module provides a uniform calling interface, and the calling of the virtual machine can be more convenient and uniform.

And the virtual machine equipment management module is used for determining whether the virtual machine needs to add the virtual industrialization interface equipment or not by receiving a user instruction.

(2) And generating a virtual machine, wherein an application program in the virtual machine is communicated with a virtual industrialization interface, and the virtual industrialization interface is communicated with the Ethernet through network port conversion.

The virtual industrial interface equipment comprises a COM interface (serial port) or a CAN interface; wherein the virtual COM interfaces appear in pairs, one of which is used for communicating with applications and the other is used for communicating with Ethernet; each pair of virtual COM interfaces communicates with each other. The CAN interfaces do not need to appear in pairs, and the same CAN interface is communicated with the application program and the Ethernet respectively.

With reference to fig. 3, the embodiment takes a COM interface (serial port) as an example for description.

(1) Modification of the host virtualization module: the main task is to generate a virtualization device for use by the virtual machine.

Specifically, if the virtual COM device can be generated when the virtual machine is started, the Qemu module needs to be modified on the host computer, and the support of the virtual COM device is increased; modifying the libvirt module to enable the virtual machine to conveniently use the virtual COM equipment; and modifying the virtual machine management module to select the virtual COM device when the virtual machine is generated.

After the virtual machine is started, the corresponding virtual COM device can be used by an application program in the virtual machine.

In this embodiment, the virtualization interface is mainly used for forwarding, so that when (libvirt/qemu) generates a device for a virtual machine, for example, when a virtualization COM interface is generated, the virtualization interface appears in pairs in the virtual machine. One virtualized COM interface is used for communication and one virtualized COM interface is used for application use. This is because a COM interface can only bind to one device; the CAN interfaces do not need to appear in pairs, and the same CAN interface is communicated with the application program and the Ethernet respectively.

(2) Fig. 4 shows the overall architecture of the generated virtual machine within the virtual machine. The serial ports A, A1, B and B1 are all virtually formed by a Qemu module. The application program A on the virtual machine A communicates with a serial port A, and the serial port A communicates with a serial port A1; and the application program B on the virtual machine B communicates with the serial port B, the serial port B communicates with the serial port B1, and the serial port A1 communicates with the serial port B1, so that the communication between the application program A and the application program B is realized.

For applications a, B, they do not have to be concerned with the reality of data forwarding. They appear to be communicating via serial ports a, B. Since one serial port can only communicate with one device, the virtual serial ports are in a pair form. For example, serial port a is paired with serial port a1, and serial port B is paired with serial port B1. The data received by the serial port A can be automatically sent to the serial port A1, and vice versa, the data received by the serial port A1 can be automatically sent to the serial port A. Serial port a is responsible for communicating with applications and serial port a1 is responsible for communicating with the network.

And for the CAN interface, only generating a CAN interface A and a CAN interface B, wherein the application program A on the virtual machine A communicates with the CAN interface B on the virtual machine B through the CAN interface A, and the CAN interface B communicates with the application program B, so that the communication between the application program A and the application program B is realized.

Example two

In one or more embodiments, a virtualized communication method is disclosed, comprising the processes of:

the method in the first embodiment is adopted to carry out virtualization of the industrial interface;

In this embodiment, a COM interface (serial port) is still taken as an example for description, and the virtualization communication method of the CAN interface is the same as the process.

(1) The virtualization method described in the first embodiment is adopted to carry out virtualization of the industrial interface;

the virtual machine is started, and a user installs a virtual serial port driver, a serial port and network port conversion module, a configuration management program and the like through an installation program.

(2) Respectively starting a configuration thread and a forwarding thread by a server virtual machine and a client virtual machine;

with reference to fig. 4, virtual machine a acts as a client virtual machine and virtual machine B acts as a server virtual machine; wherein the server virtual machine broadcasts (or multicasts) the locally available serial port once every 5 seconds for other clients to use. And the client virtual machine is actively connected with the serial port of the server.

Once the connection is established, the serial port of the server virtual machine does not perform broadcasting any more.

In the management interface, a user determines whether the computer runs in a client virtual machine mode or a server virtual machine mode through configuration. If the virtual machine is operated in the service end virtual machine mode, the user does not participate in configuration any more. If the virtual machine runs on the client virtual machine, clicking a button to automatically discover the virtual serial ports which can be connected by all the server virtual machines of the network segment.

In a client virtual machine, a user selects a virtual serial port for connection; at the server side virtual machine, the connected virtual machine port is not broadcasted any more.

In this embodiment, the matching between the client and the server is automatically recorded. If the virtual machine is restarted and disconnected, the connection can be automatically carried out after the virtual machine is recovered to be normal.

(3) The configuration thread of the client virtual machine receives broadcast data sent by the server virtual machine, selects and connects a corresponding server virtual machine, and sends local virtual industrial interface parameters to enable the server virtual machine to complete corresponding interface configuration;

with reference to fig. 5, the configuration process of the client virtual machine and the server virtual machine is specifically as follows:

1) the client virtual machine and the server virtual machine both start two threads, one is called a configuration thread and the other is called a forwarding thread.

2) And the service end virtual machine configuration thread sends the broadcast data once every 5 seconds. The content of the data includes: local IP address, and name of idle virtual serial port.

3) And the client virtual machine can be displayed on the management interface after receiving the broadcast data of the server virtual machine. Therefore, the client virtual machine interface has a plurality of connectable server virtual machine serial ports. And the user selects one of the virtual serial ports to connect. At this time, the client virtual machine sends the local virtual COM port parameters (baud rate, data bit, stop bit, parity check, etc.) to the server virtual machine in a form of response.

4) And after receiving the corresponding parameters, the server virtual machine adjusts the serial port parameters of the server virtual machine. And after the adjustment is finished, closing the local broadcast to the virtual serial port, and sending a configured message to the client virtual machine.

5) The step 2)3)4) is completed through the configuration threads of the client and the server.

6) After the configuration is successful, the forwarding thread of the client virtual machine is actively connected with the forwarding thread of the server virtual machine, and a channel is established for data transmission of the virtual machine.

7) In the subsequent operation process, if the client virtual machine is modified again by the configuration parameters, the configuration is continuously modified through the configuration thread. If abnormal conditions, such as network disconnection, occur in the configuration connection process; then all configuration parameters at both ends are cleared and the configuration is performed again.

8) After the configuration is completed successfully, the configuration parameters and the connection information of the two ends (the IP and the virtual serial port number of the respective opposite end) are recorded in a configuration file; after the system is restarted or the network is disconnected, the system can automatically recover.

(4) After the configuration is completed, the forwarding thread of the client virtual machine is connected with the forwarding thread of the server virtual machine so as to establish a data transmission channel.

After the configuration is completed, the two virtual serial ports are connected through the Ethernet, and the configuration of the parameters is completed. At this time, the serial port of the client is in the up state, and waits for the application program to initiate a connection request.

The application program A sends data to the virtual serial port A, and the virtual serial port A1 appear in pairs, so that the data are automatically sent to the virtual serial port A1 from the virtual serial port A;

after the data reaches the virtual serial port A1, the whole data is used as the application layer data of the Ethernet for network transmission.

And transmitting the data through the connection channel established by the forwarding thread.

After the data reaches the virtual machine B, the serial port and network port conversion module extracts the data from the data and sends the data to the virtual serial port B1, and the virtual serial port B1 and the virtual serial port B appear in pairs, so that the data can be automatically transmitted to the virtual serial port B; after the virtual serial port B receives the data, the application program B can perform corresponding operation on the data. Conversely, the data also performs the same operation from application B to application a.

The method solves the problem that a special computer is migrated to the cloud virtualization platform. Compared with the traditional mode, the method has the advantages that the application program of the user does not need to be modified, and the compatibility of the application program from the physical machine to the virtual machine is guaranteed.

EXAMPLE III

In one or more embodiments, a virtualized communication system is disclosed, comprising:

the virtualization module is used for virtualizing an industrial interface;

The specific implementation process of each module has been described in detail in embodiment two, and is not described herein again.

Example four

In one or more embodiments, a host with an industrial interface is disclosed, which performs virtualization of the industrial interface by using the method described in the first embodiment to generate a virtual machine; and performing communication among different virtual machine applications by adopting the virtualization communication method described in the second embodiment.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.

Claims

1. A virtualization method of an industrial interface is characterized by comprising the following steps:

2. A method for virtualizing an industrial interface as described in claim 1 wherein said virtual industrial interfaces are virtual COM interfaces, said virtual COM interfaces occurring in pairs, one of the virtual COM interfaces being used for communicating with applications and the other being used for communicating with ethernet; each pair of virtual COM interfaces communicates with each other.

3. The method of claim 1, wherein the virtual industrial interface is a CAN interface, and the CAN interface communicates with the application and the ethernet network, respectively.

4. The method for virtualizing an industrial interface as claimed in claim 1, wherein said host computer comprises:

the Qemu module is used for generating virtual industrial interface equipment for the virtual machine to use;

the libvirt module is used for providing a uniform calling interface so that the virtual machine can call the virtual industrialized interface equipment;

and the virtual machine equipment management module is used for determining whether the virtual machine needs to use the virtual industrialization interface equipment or not by receiving a user instruction.

5. A virtualized communication method, comprising:

virtualizing an industrial interface using the method of any of claims 1-4;

6. The virtualized communication method according to claim 5, wherein if an exception occurs during the configuration process, all configuration parameters of the client virtual machine and the service virtual machine are cleared, and the configuration is performed again;

after configuration is completed, the configuration parameters are stored, and after abnormity occurs, the configuration parameters are automatically recovered;

alternatively, the first and second electrodes may be,

the server side configuration thread sends broadcast data once every set time until connection with the client side virtual machine is established; the broadcast data includes: the local IP address, and the name of the idle virtual industrialization interface.

7. The virtualized communication method of claim 5, wherein the client virtual machine sends the local virtual industrialized interface parameters to make the server virtual machine complete the corresponding interface configuration; the method specifically comprises the following steps:

the client virtual machine sends the local virtual industrialized interface parameters, and the method comprises the following steps: baud rate, data bits, stop bits, and parity; and after receiving the parameters, the server virtual machine adjusts own virtual industrialized interface parameters, closes the broadcast after the adjustment, and sends the configured message to the client virtual machine.

8. The virtualized communication method of claim 5, wherein after configuration is completed, further comprising:

the method comprises the steps that a first application program sends data to a virtual industrialization interface of a client virtual machine, and the virtual industrialization interface sends the received data to a server virtual machine through Ethernet;

and the virtual industrialization interface of the server virtual machine receives the data and transmits the data to a second application program of the server virtual machine.

9. A virtualized communication system, comprising:

the virtualization module is used for virtualizing an industrial interface;

10. A host with an industrial interface is characterized in that the method of any one of claims 1 to 4 is adopted to virtualize the industrial interface to generate a virtual machine; communication between different virtual machine applications is performed using the virtualized communication method of any of claims 5-8.