CN115629843A - A Cloud Heterogeneous Virtualization Digital Simulation Platform - Google Patents

Abstract

The invention discloses a cloud heterogeneous virtualization digital simulation platform, based on which users can create and manage virtual machines with multi-CPU architecture. The platform includes four parts: cloud virtual machine generation and operating environment, cloud platform access framework, local user access interface and custom network communication protocol. The cloud virtual machine generation and operating environment provides the required resources for the virtual machine. The cloud platform access framework is responsible for user access control and virtual machine management as the middle layer. The local user access interface supports the user to configure, control and remotely interact with the virtual machine. Define network communication protocols to ensure data synchronization and information security between various parts of the platform. The platform is set up in the cloud, and the local deployment is simple, efficient and flexible, which can greatly save local resources.

Description

A Cloud Heterogeneous Virtualization Digital Simulation Platform

technical field

The invention belongs to the field of computer system virtualization, in particular to a cloud heterogeneous virtualization digital simulation platform.

Background technique

In recent years, the widespread use of virtualization technology in the computer field has brought great convenience to users. It abstracts the physical resources of computers, breaks the inseparable barriers between physical structures, and provides one or more operating environments. Realize the simulation, isolation and sharing of resources, so that physical resources can be utilized to the maximum extent.

There are also a number of common VMM software emerging on the market, such as Xen, KVM, VMware, VirtualBox, etc., which provide convenient management functions for virtual machines, but these software can only simulate virtual machines that are consistent with the hardware architecture of the host, and cannot Perform multi-architecture virtual machine emulation. QEMU supports cross-architecture simulation of virtual machines, but it is used in the form of a command line, which requires high professionalism and does not have a concise visual interface, which is not convenient for ordinary users to use. In addition, the dependent files of traditional virtual machines are mostly stored on the user's local machine, occupying local storage space, and the operating environment also relies on local resources, resulting in low performance. The maturity of cloud computing technology has made it a new trend to set up virtual machines on the cloud. Deploying a heterogeneous virtualization simulation platform on the cloud allows users to remotely access heterogeneous virtual machines in the cloud, which not only saves local storage space, but also improves performance, and it is easier and more flexible to use.

Contents of the invention

The purpose of the present invention is to provide a cloud heterogeneous virtualization digital simulation platform, which provides users with the service of building and managing multi-CPU architecture virtual machines. The platform supports concurrent access by multiple users through cloud deployment. Users only need to install the SDK locally. The deployment is simple, the flexibility is high, and the local storage space can be greatly saved.

The cloud heterogeneous virtualization digital simulation platform provided by the present invention integrates four types of file pools in the cloud platform in advance: virtual machine dependent file pool, OS image pool, service configuration integration pool, open source library and software pool, file pool It includes the resources required for creating and running virtual machines with more than six CPU architectures. Users can create and manage virtual machines with multiple CPU architectures based on this platform. At the same time, they can perform virtual machine hardware emulation based on QEMU, and users can configure virtual machine hardware locally. Parameters, the platform includes cloud virtual machine generation and operating environment, cloud platform access framework, local user access interface, and custom network communication protocol.

The generation and operation environment of the cloud virtual machine is set up on a high-performance server in the cloud, which provides more than six types of resources required for the creation and operation of the virtual machine of the architecture, and can receive requests from the cloud platform access framework, and control the environment in this environment according to the control flow connection Create, run, suspend and shut down the virtual machine; at the same time, the data interacted between the user and the virtual machine can be transmitted according to the data flow connection; in order to ensure security, this environment only provides limited intranet access, and only communicates with the cloud platform access framework Restricted information exchange, no external network access. For the host OS environment that heterogeneous virtual machines rely on, the cloud virtual machine generation and operating environment provides Windows and Linux dual-hosting environments for users to choose; the operating mode of the virtual machine supports GUI (graphical user interface) and CLI (command line interface) ) two modes, the user can specify to use one.

The cloud virtual machine generation and running environment can carry out heterogeneous hardware simulation. The platform is based on QEMU to simulate seven hardware devices, including: CPU, memory, network card, hard disk, FLASH, SD card and serial port. Among them, the CPU supports more than six architectures; the memory supports at least one slot, and the size of a single slot can be configured; the network back-end mode of the network card supports three types: tap, user, and bridge; the hard disk supports three types: hda, sda, and vda; FLASH SD and SD are external devices with a configurable size; the support for the serial port type varies according to the virtual machine architecture, and the serial port baud rate can be changed.

Further, the creation and operation of a virtual machine depends on various types of files, and the cloud virtual machine generation and operation environment provides four types of file pools, specifically including:

(1) The virtual machine depends on the file pool, including uboot startup files, device tree files, and firmware programs adapted to X86, ARM, RISC-V, PowerPC, MIPS, SPARC and other architectures;

(2) OS image pool, including at least six architectures, three types (Debian, CentOS, kernel image), multiple versions (Debian 9.x, Debian 10.x, Debian 11.x, CentOS 7.x, CentOS8 .x, Linux Kernel2.x, Linux Kernel 3.x, Linux Kernel 4.x, Linux Kernel 5.x) OS images;

(3) Service configuration integration pool, in order to facilitate the integration of services (ssh, cron, tftp, vncserver, gdbserver, etc.) Program and installation configuration scripts;

(4) Open source libraries and software pools, combined with open source code and cross-compilation tool chains, provide open source libraries and software (gcc, gdb, vim, etc.).

The cloud virtual machine generation and operating environment maintains a file record table, which records the index from the file name to the file path in the file pool, which is convenient for quickly querying and using files.

Furthermore, the cloud virtual machine generation and operating environment adapts RootFS to each virtual machine, and building RootFS requires the support of a file pool. The platform uses the Busybox tool and cross-compilation tool chain to generate the basic RootFS directory, then integrates the service programs and open source software in the file pool into RootFS, and finally compresses RootFS into an initramfs that can be mounted by the virtual machine, so that the virtual machine can contain more Multiple services and software.

Before the virtual machine is started and running, the cloud virtual machine generation and operating environment are designed to prevent multiple virtual machines from preempting and conflicting when using host resources, such as IP address conflicts and port conflicts. Isolate and improve the security of the virtual machine, specifically: create a working directory for each virtual machine, and copy the dependent files of the virtual machine from the file pool to the working directory of the target virtual machine before starting the virtual machine to ensure that the dependent Isolation of files; the cloud maintains a data record table to record the occupied IP address and the occupied port number under the IP address. After receiving the virtual machine generation command from the local user, the IP involved in the command is parsed Address and port number, check whether the IP address and port number exist in the data record table. If not, it indicates that the IP address and port number are available. If they exist, the generation of the virtual machine is terminated, and the specific situation of the conflict is reported to the user.

After the virtual machine is generated and started, the cloud virtual machine generation and operating environment can dynamically integrate new services and software into the virtual machine, that is, use the file pool to integrate new programs into the virtual machine RootFS. The specific steps are:

S1. Save the snapshot of the virtual machine;

S2, stop the virtual machine;

S3, copy the software and configuration files in the file pool to the virtual machine RootFS;

S4, rerun the virtual machine from the snapshot saved in the first step;

S5. Using newly integrated services and software.

The cloud platform access framework is divided into a user management sub-module and a virtual machine management sub-module. The user management sub-module interacts with the local user access interface, receives the local user's access request, encrypts and stores the user account password, and authenticates the user; the virtual machine The management sub-module receives the virtual machine configuration file and the virtual machine status query and control request sent by the local user access interface, and uses the internal communication protocol to send the virtual machine creation, operation, suspend and close requests;

The cloud platform access framework encapsulates the content of the received virtual machine configuration file, adds the protocol flow ID and the target virtual machine ID, forms the control flow data and sends it to the virtual machine generation and operating environment, and the virtual machine generation and operating environment receives it to the cloud platform After accessing the control flow data from the framework, analyze the virtual machine configuration information in the data, and obtain the virtual machine dependent file path (including the adapted RootFS) in the file pool according to the analyzed configuration parameters, and target the virtual machine host selected by the user Platform, generate the corresponding bat script (Windows platform) or shell script (Linux platform), use the script file to generate and start the virtual machine.

There are custom network communication protocols between cloud server clusters and between local user access interfaces and cloud platform access frameworks, including:

Internal communication protocol. This protocol is a protocol for information exchange between the cloud platform access framework and the cloud virtual machine generation and operating environment. It is a TCP-based user layer protocol with two connection modes: control flow and data flow.

The control flow connection is used to transmit configuration information generated by the virtual machine, operation instructions (starting, suspending, restarting and shutting down of the virtual machine), dynamic function integration information, and operation return codes.

Virtual machine generation configuration information includes: stream ID, virtual machine ID, CPU architecture, development board architecture, number and size of memory slots, hard disk type and capacity, network mode, serial port baud rate, operating system type and version, IP address, GDB Port number, host environment, interaction mode, virtual machine startup mode;

Operation command information includes: stream ID, virtual machine ID, operation mode (start, suspend, restart, close);

Dynamic function integration information includes: stream ID, virtual machine ID, service name, open source tool chain name;

The operation return code includes: stream ID, virtual machine ID, and operation result information;

The data flow connection transmits the information input by the user to the virtual machine and the information output by the virtual machine;

The information grid input by the user to the virtual machine includes: stream ID, virtual machine ID, and input data information;

The virtual machine output information includes: flow ID, virtual machine ID, output data information;

User communication protocol. This protocol is a protocol for information exchange between the local user access interface and the cloud platform access framework. It is also a TCP-based user layer protocol, used for user login access and virtual machine information transmission; login access transmission is The data information that controls the user's registration, login, and authority access has the characteristics of a small amount of information transmitted in a single time, many entries, and complex control; the information transmitted by the virtual machine is the information that the user interacts with the virtual machine, including the content that the user inputs to the virtual machine And the output returned by the virtual machine has the characteristics of large amount of information in a single transmission, long retention time and simple control.

Access request content includes: flow ID, operation type (user registration, user login, cloud verification), data sender ID, data receiver ID, user account, user password, request status information;

Virtual machine information includes: stream ID, data sender ID, data receiver ID, virtual machine configuration data, virtual machine ID, virtual machine input data, virtual machine output data;

The content of the virtual machine status query and control request includes: stream ID, data sender ID, data receiver ID, virtual machine ID, query and control instructions;

In addition, for data transmission, the platform adopts the RSA asymmetric encryption algorithm to ensure the security of data transmission, and at the same time optimizes the encryption and decryption process of the algorithm to improve the efficiency of platform data transmission.

The local user access interface interacts with the cloud platform access framework to realize user registration and login, virtual machine configuration, virtual machine state control, and remote code debugging. The user first remotely accesses the cloud platform locally, and can only log in to the platform after completing the registration. The user's account password is encrypted and stored in the cloud database, and the cloud platform access framework authenticates the user. The local user access interface module is released in the form of SDK, which provides APIs of four mainstream programming languages (Java, Python, C++, Go) interacting with the cloud, and provides SDK-based development specification documents. Developers can use the SDK API and development specification Various forms of software development, such as PC client, web application, plug-in, etc., are carried out locally.

After users log in to the platform, they can create and manage virtual machines according to their needs. The platform supports the simulation of virtual machines with various architectures (X86, ARM, RISC-V, PowerPC, MIPS, SPARC, etc.), and provides configuration template files for the simulated virtual machines. The template file type is json.

The user configures the parameters of the virtual machine on the local configuration interface. The specific configuration content includes CPU architecture, number of memory slots, size of a single memory slot, hard disk type (had, sda, vda), hard disk capacity, network card mode (tap, user, bridge ), IP address, serial port baud rate, FLASH device capacity, SD card capacity, operating system image (multiple types and versions of operating system images can be selected), GDB debugging port number, virtual machine host environment (Windows, Linux), Interactive mode (GUI, CLI), virtual machine startup mode (Uboot startup, direct startup), configuration parameters are written into the template file, and the template file is uploaded to the cloud platform access framework to generate the virtual machine in the next step.

The user can query and control the status of the remote virtual machine locally. The status of the virtual machine includes startup, running, shutdown, and suspension. The user sends a virtual machine status query request to the virtual machine management submodule, and the virtual machine management submodule parses the request. The vm_query parameter of the target virtual machine obtains the ID of the target virtual machine, and forwards the query request to the virtual machine generation and operating environment; the virtual machine generation and operating environment queries the status of the virtual machine process in the host machine, and returns the query result to the user through the data flow connection. The user sends a state control request to the virtual machine management sub-module, and the virtual machine management sub-module parses the vm_control parameter in the request, and sends virtual machine control operation instructions to the virtual machine generation and running environment according to the parameter content, so as to realize the virtual machine startup, shutdown, Suspend and so on.

Users can remotely debug the embedded Linux system code locally. Each cloud embedded Linux virtual machine is loaded with the GDBServer service program. Users download the GDB file corresponding to the CPU architecture from the cloud open source library and software pool. The cloud embedded Linux The system starts the GDBServer service according to the GDB debugging port number specified in the configuration process, and the user uses the downloaded GDB file locally to remotely connect to the GDBServer port in the cloud embedded Linux virtual machine to perform cross-architecture debugging of the program.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings that need to be used in this embodiment will be briefly introduced below. It should be understood that the following drawings are only some embodiments of the present invention, and those of ordinary skill in the art In other words, other drawings can also be obtained from these drawings without paying creative labor.

FIG. 1 is a schematic diagram of the architecture of a cloud-based heterogeneous virtualized digital simulation platform provided by an embodiment of the present invention.

Fig. 2 is a flow chart of creating a virtual machine according to an embodiment of the present invention.

FIG. 3 is a flow chart of virtual machine status query according to an embodiment of the present invention.

FIG. 4 is a flow chart of virtual machine state control according to an embodiment of the present invention.

Fig. 5 is a flowchart of dynamic integration of virtual machine services according to an embodiment of the present invention.

Fig. 6 is a flowchart of debugging the embedded Linux system according to the embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The purpose of the present invention is to provide a cloud heterogeneous virtualization digital simulation platform, which provides users with the service of building and managing multi-CPU architecture virtual machines. The platform supports concurrent access by multiple users through cloud deployment. Users only need to install the SDK locally. The deployment is simple, the flexibility is high, and the local storage space can be greatly saved.

Specifically, Fig. 1 is a schematic diagram of the architecture of a cloud heterogeneous virtualized digital simulation platform provided by an embodiment of the present invention. The platform includes a cloud virtual machine generation and operating environment, a cloud platform access framework, a local user access interface, and a custom network letter of agreement.

The cloud virtual machine generation and running environment is set up on a high-performance server in the cloud, providing two host environments of Windows and Linux, and providing the resources required for virtual machine creation and operation. The host environment is based on QEMU for virtual machine hardware emulation, including seven hardware devices: CPU, memory, network card, hard disk, FLASH, SD card and serial port. Among them, the CPU supports X86, ARM, RISC-V, PowerPC, MIPS, SPARC, etc. Architecture; the memory supports at least one slot, and the size of a single slot can be configured; the network back-end mode of the network card supports three types: tap, user, and bridge; the hard disk supports three types: hda, sda, and vda; FLASH and SD are external devices. The size is configurable; the support for the serial port type varies according to the virtual machine architecture, and the serial port baud rate can be changed.

Furthermore, the cloud virtual machine generation and running environment provides four kinds of file pools on which the creation and running of virtual machines depend, including:

(1) The virtual machine depends on the file pool, including uboot startup files, device tree files, and firmware programs adapted to X86, ARM, RISC-V, PowerPC, MIPS, SPARC and other architectures;

(2) OS image pool, including at least six architectures, three types (Debian, CentOS, kernel image), multiple versions (Debian 9.x, Debian 10.x, Debian 11.x, CentOS 7.x, CentOS8 .x, Linux Kernel2.x, Linux Kernel 3.x, Linux Kernel 4.x, Linux Kernel 5.x) OS image, depending on the image file, the operating mode of the virtual machine supports GUI (Graphical User Interface) and CLI (command line interface) two modes, the user can specify to use one;

(3) Service configuration integration pool, in order to facilitate the integration of services (ssh, cron, tftp, vncserver, gdbserver, etc.) Program and installation configuration scripts;

(4) Open source libraries and software pools, combined with open source code and cross-compilation tool chains, provide open source libraries and software (gcc, gdb, vim, etc.).

At the same time, the cloud virtual machine generation and operating environment maintains a file record table, which records the index from the file name to the file path in the file pool, which is convenient for quickly querying and using files.

The cloud virtual machine generation and running environment adapts RootFS to each virtual machine, and the construction of RootFS requires the support of the file pool; the platform uses the Busybox tool and the cross-compilation tool chain to generate the basic RootFS directory, and then integrates the service program in the file pool with the open source The software is integrated into RootFS, and finally the RootFS is compressed into an initramfs that the virtual machine can mount, so that the virtual machine can contain more services and software.

Cloud virtual machine generation and operating environment In order to prevent multiple virtual machines from preempting and conflicting when using host resources, such as IP address conflicts, port conflicts, etc., the operating environment of the virtual machine and the resources used are isolated to improve the security of the virtual machine , specifically: create a working directory for each virtual machine, copy the dependent files of the virtual machine from the file pool to the working directory of the target virtual machine before starting the virtual machine, and ensure the isolation of dependent files; the cloud maintains a data Record table, which records the occupied IP address and the occupied port number under the IP address. After receiving the virtual machine generation instruction from the local user, analyze the IP address and port number involved in the instruction, and query the data record Check whether the IP address and port number exist in the table. If not, it indicates that the IP address and port number are available. If they exist, the generation of the virtual machine is terminated, and the specific situation of the conflict is reported to the user.

The cloud platform access framework, as the middle layer, is responsible for user access control and virtual machine management, including user management sub-modules and virtual machine management sub-modules. The user management sub-module maintains a user database for storing user account passwords, and the user data stored in the user database is encrypted using an encryption algorithm to ensure data security. The virtual machine management sub-module acts as a bridge to control the information flow between the local user access interface and the cloud virtual machine generation and operating environment. By analyzing the custom network communication protocol, it realizes virtual machine configuration management, virtual machine status query, and virtual machine status Control, virtual machine information data forwarding.

The local user access interface is software installed locally by the user, which provides a visual interface for the user to interact with the cloud platform. Users can log in to the platform after completing identity registration locally to perform virtual machine configuration, virtual machine status query and control, and code remote debugging. The local user access interface especially supports publishing in the form of SDK, provides APIs of four mainstream programming languages (Java, Python, C++, Go) interacting with the cloud, and provides development specification documents, and developers can implement PC clients locally based on the interface protocol. Various forms of software development such as terminals, web applications, plug-ins, etc.

The custom network communication protocol is a specification for communication between cloud server clusters and the local user access interface and cloud platform access framework. It is a user layer protocol based on the TCP protocol and is used to synchronize between cloud servers and between the client and the cloud platform. The information exchange between access frameworks coordinates the functional operation of each part of the platform, and the communication protocol provides a secure encryption strategy to ensure the security of data transmission. The custom network communication protocol specifically includes two types of internal communication protocol and user communication protocol.

The internal communication protocol is a protocol for information exchange between the cloud platform access framework and the cloud virtual machine generation and operating environment. It is a TCP-based user layer protocol with two connection modes: control flow and data flow.

The control flow connection is used to transmit configuration information generated by the virtual machine, operation instructions (starting, suspending, restarting and shutting down of the virtual machine), dynamic function integration information, and operation return codes.

Virtual machine generation configuration information format:

Operation instruction format:

Dynamic function integration information format:

Operation return code format:

Data stream connections carry information that the user enters into the virtual machine and information that goes out of the virtual machine.

The format of the information entered by the user into the virtual machine:

Virtual machine output information format:

The user communication protocol is a protocol for information exchange between the local user access interface and the cloud platform access framework. It is also a TCP-based user layer protocol for user login access and virtual machine information transmission. Login authority access transfers the data information that controls the user's registration, login, and authority access. It has the characteristics of small amount of information, many items, and complex control in a single transmission; the virtual machine information transmits information about the interaction between the user and the virtual machine, including user The content input to the virtual machine and the output returned by the virtual machine have the characteristics of a large amount of information in a single transmission, a long retention time and simple control.

Access request format:

Virtual machine information format:

Virtual machine status query and control request format:

In addition, for data transmission, the platform adopts the RSA asymmetric encryption algorithm to ensure the security of data transmission, and at the same time optimizes the encryption and decryption process of the algorithm to improve the efficiency of platform data transmission.

Fig. 2 is a flow chart of creating a virtual machine according to an embodiment of the present invention.

The user first remotely accesses the cloud server locally and enters the account password to register. The user's account password is encrypted and stored in the cloud user database. After the registration is completed, the user enters the account password to log in to the platform, and the cloud platform verifies whether the user's account password is correct. If correct, the user is allowed to enter the platform.

After the user successfully logs in to the platform, configure the hardware parameters of the virtual machine on the local virtual machine configuration interface according to actual needs. The configurable content includes: CPU architecture, number of memory slots, size of single memory slot, hard disk type (had, sda, vda) , hard disk capacity, network card mode (tap, user, bridge), IP address, serial port baud rate, FLASH device capacity, SD card capacity, OS image (multiple types and versions of the operating system image can be selected), IP address, GDB Debugging port number, virtual machine host environment (Windows, Linux), interactive mode (GUI, CLI), virtual machine startup mode (Uboot startup, direct startup). The present invention provides a virtual machine parameter configuration template file. User-defined parameters will be written into the virtual machine configuration template file and stored in json format. The format and content of the template file are as follows:

After the user configuration is completed, the configuration file is uploaded to the cloud platform access framework, and the cloud platform access framework encapsulates the configuration file data, adds the protocol flow ID and the target virtual machine ID, and forms the control flow data and sends it to the virtual machine generation and operating environment After the virtual machine generation and operating environment receives the control flow data from the cloud platform access framework, it parses the virtual machine configuration information in the data, and obtains the virtual machine dependent file path (including the adapted RootFS) in the file pool.

Before the virtual machine is started and running, the platform queries whether the IP address and port number in the configuration file exist in the data record table. If it exists, the generation of the virtual machine will be terminated and the specific situation of the conflict will be fed back to the user; if it does not exist, the Indicate that the IP address and port are available, and then the platform creates a working directory for the target virtual machine, and copies the dependent files of the virtual machine from the file pool to the working directory of the target virtual machine. Next, for the virtual machine host platform selected by the user, generate a corresponding bat script (Windows platform) or shell script (Linux platform), and use the script file to generate and start the virtual machine.

FIG. 3 is a flow chart of virtual machine status query according to an embodiment of the present invention.

The user can query the status of the remote virtual machine locally. The status of the virtual machine includes startup, running, shutdown, and suspension. The user sends a virtual machine status query request to the virtual machine management sub-module according to the communication protocol, and the virtual machine management sub-module analyzes The vm_query parameter in the request obtains the ID of the target virtual machine, and forwards the query request to the virtual machine generation and running environment; the virtual machine generation and running environment queries the status of the virtual machine process in the host machine, and returns the query result to the user through the data flow connection.

FIG. 4 is a flow chart of virtual machine state control according to an embodiment of the present invention.

The user can control the state of the remote virtual machine locally. The user sends a state control request to the virtual machine management submodule according to the communication protocol. The virtual machine management submodule parses the vm_control parameter in the request and generates and runs the virtual machine according to the parameter content. The environment sends virtual machine control operation instructions to implement operations such as starting, shutting down, and suspending the virtual machine.

Fig. 5 is a flowchart of dynamic integration of virtual machine services according to an embodiment of the present invention.

After the virtual machine is generated and started, the user can dynamically integrate new services and software into the virtual machine, that is, use the file pool to integrate new programs into the virtual machine RootFS. The specific steps are:

S1. Save the snapshot of the virtual machine;

S2, stop the virtual machine;

S3, copy the software and configuration files in the file pool to the virtual machine RootFS;

S4, rerun the virtual machine from the snapshot saved in the first step;

S5. Using newly integrated services and software.

Fig. 6 is a flowchart of debugging the embedded Linux system according to the embodiment of the present invention.

The platform supports users to remotely debug the code of the embedded Linux system. Each cloud embedded Linux virtual machine is loaded with the GDBServer service program. Users download the GDB file corresponding to the CPU architecture from the cloud open source library and software pool. The cloud embedded Linux system According to the GDB debugging port number specified in the configuration process, start the GDBServer service, the specific command is: gdbserver<host-ip>:port filename Among them, <host-ip> is the IP address of the host machine, and port is the debugging specified in the configuration process Port number, filename is the file name of the program to be debugged.

The user locally uses the downloaded GDB file to remotely connect to the GDBServer port in the embedded Linux virtual machine in the cloud for cross-architecture debugging of the program. The remote connection command is: target remote<target-board-ip>:port where, < target-board-ip> is the ip address of the embedded Linux system in the cloud, and port is the debugging port number specified in the configuration process.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention shall fall within the protection scope of the present invention.

Claims (10)

1. A cloud heterogeneous virtualization digital simulation platform, characterized in that the four types of files of virtual machine dependent file pool, OS image pool, service configuration integration pool, open source library and software pool are integrated in the cloud platform in advance Pool, the file pool includes the resources required for creating and running virtual machines with more than six CPU architectures. Users can create and manage virtual machines with multiple CPU architectures based on this platform, and at the same time perform virtual machine hardware emulation based on QEMU. Configure virtual machine hardware parameters. The platform includes cloud virtual machine generation and operating environment, cloud platform access framework, local user access interface, and custom network communication protocol, among which: The cloud virtual machine generation and operating environment is set up on a high-performance server in the cloud, which provides more than six types of resources required for the creation and operation of virtual machines with architectures, receives requests from the cloud platform access framework, and controls the virtual environment in this environment according to the control flow connection. Create, run, suspend, and shut down the machine; transmit the data interacted between the user and the virtual machine according to the data flow connection; in order to ensure security, this environment only provides limited intranet access, and only communicates with the cloud platform access framework for limited information Interaction, no external network access; The cloud platform access framework is divided into a user management sub-module and a virtual machine management sub-module. The user management sub-module encrypts and stores user account passwords, receives access requests from local users, and authenticates users; the virtual machine management sub-module receives local user access The virtual machine configuration file and virtual machine status query and control requests sent by the interface, according to the received request content, use the internal communication protocol to send virtual machine creation, operation, suspension and shutdown requests to the cloud virtual machine generation and operation environment; The local user access interface provides user registration and login functions, and sends virtual machine configuration files and virtual machine status query and control requests to the cloud platform access framework according to user needs, supports users to remotely debug code locally, and supports publishing in the form of SDK. The APIs of four mainstream programming languages, Java, Python, C++, and Go, interact with the cloud, and provide development specification documents. Developers can locally implement PC clients, web applications, or plug-ins in various forms of software based on the interface protocol. development; The custom network communication protocol is a specification for communication between cloud server clusters and the local user access interface and cloud platform access framework. It is a user layer protocol based on the TCP protocol and is used to synchronize between cloud servers and between the client and the cloud platform. The information exchange between access frameworks coordinates the functional operation of each part of the platform, and the communication protocol provides a secure encryption strategy to ensure the security of data transmission. 2. The cloud heterogeneous virtualization digital simulation platform according to claim 1, characterized in that, the cloud virtual machine generation and operating environment supports virtual machine simulation of more than six architectures, specifically X86, ARM, RISC- V, PowerPC, MIPS, SPARC; the hardware equipment of virtual machine is emulated based on QEMU, specifically includes: CPU, internal memory, network card, hard disk, FLASH, SD card and serial port seven kinds; Described local user access interface provides virtual machine configuration template file , the user configures the hardware parameters of the virtual machine on the local configuration interface. The specific configuration content includes CPU architecture, number of memory slots, size of a single memory slot, hard disk type, hard disk capacity, network card mode, IP address, serial port baud rate, and FLASH device Capacity, SD card capacity, OS image, IP address, GDB debugging port number, virtual machine host environment, interactive mode, virtual machine startup mode, configuration parameters are written into the template file, and the template file is uploaded to the cloud platform access framework for the next step For virtual machine generation, the template file format is json. 3. The cloud heterogeneous virtualization digital simulation platform according to claim 1, wherein the cloud virtual machine generation and operating environment provides four types of file pools, specifically comprising: The virtual machine depends on the file pool, including the uboot startup files adapted to the X86, ARM, RISC-V, PowerPC, MIPS, and SPARC architectures, the device tree files and firmware programs required to start the virtual machine; OS image pool, including at least six architectures, three types including Debian, CentOS, kernel image, multiple versions including Debian 9.x, Debian 10.x, Debian 11.x, CentOS 7.x, CentOS8.x, Linux Operating system images of Kernel 2.x, Linux Kernel 3.x, Linux Kernel 4.x, Linux Kernel 5.x; Service configuration integration pool, in order to facilitate the integration of services in the virtual machine, including ssh, cron, tftp, vncserver, gdbserver, provide service programs and installation configuration scripts for different architectures of X86, ARM, RISC-V, PowerPC, MIPS, and SPARC; Open source libraries and software pools, combined with open source code and cross-compilation tool chains, provide open source libraries and software including gcc, gdb, vim; The cloud virtual machine generation and operating environment provides root file system RootFS adaptation, and the construction of the root file system requires the support of the file pool. The platform uses the Busybox tool and the cross-compilation tool chain to generate the basic RootFS directory, and then the service program in the file pool and The open source software is integrated into RootFS, and finally the RootFS is compressed into an initramfs that can be mounted by the virtual machine; the cloud virtual machine generation and operating environment maintains a file pool record table, which records the index from the file name to the file path in the file pool, which is convenient for rapid Query and use files. 4. The cloud heterogeneous virtualization digital simulation platform according to claim 1, characterized in that, in order to prevent a plurality of virtual machines from preempting and conflicting when using the host computer resources in the cloud virtual machine generation and operating environment, the virtual machine The operating environment and resources used are isolated to improve the security of the virtual machine, specifically: Create a working directory for each virtual machine. Before starting the virtual machine, copy the dependent files of the virtual machine from the file pool to the working directory of the target virtual machine to ensure the isolation of dependent files; The cloud virtual machine generation and operating environment maintains a data record table, which records the occupied IP address and the occupied port number under the IP address. After receiving the virtual machine generation instruction from the local user, the parsing instruction involves Check whether the IP address and port number exist in the data record table. If it does not exist, it indicates that the IP address and port number are available. If they exist, the generation of the virtual machine will be terminated, and a conflict prompt will be fed back to the user. 5. The cloud heterogeneous virtualization digital simulation platform according to claim 1, wherein the cloud virtual machine generation and operating environment supports dynamic integration of new services and software into the virtual machine, and the specific steps are: S1. Save the snapshot of the virtual machine; S2, stop the virtual machine; S3, copy the software and configuration files in the file pool to the virtual machine RootFS; S4, rerun the virtual machine from the snapshot saved in the first step; S5. Using newly integrated services and software. 6. The cloud heterogeneous virtualization digital simulation platform according to claim 2, wherein the cloud platform access framework encapsulates the received virtual machine configuration file content, and adds a protocol flow ID and a target virtual machine ID , to form the control flow data and send it to the virtual machine generation and operating environment. After receiving the control flow data from the cloud platform access framework, the virtual machine generation and operating environment parses the virtual machine configuration information in the data. According to claim 2 The configuration parameter obtains the virtual machine dependent file path in the file pool, including the adapted RootFS, generates the corresponding bat script or shell script for the virtual machine host platform selected by the user, and generates and starts the virtual machine through the script file. 7. The cloud heterogeneous virtualization digital simulation platform according to claim 1, wherein the local user access interface supports users to remotely debug the embedded Linux system code locally, and each cloud embedded Linux virtual All computers are loaded with the GDBServer service program, and the user downloads the GDB file corresponding to the CPU architecture from the cloud open source library and software pool. The cloud embedded Linux system starts the GDBServer service according to the GDB debugging port number specified in the configuration process. The downloaded GDB file is remotely connected to the GDBServer port in the embedded Linux virtual machine in the cloud for cross-architecture debugging of the code. 8. The cloud-based heterogeneous virtualized digital simulation platform according to claim 1, wherein the local user access interface is released in the form of an SDK, and four mainstream programming languages are provided including APIs of Java, Python, C++ and Go, It also provides SDK-based development specification documents, and developers can develop PC clients, web applications, and plug-ins in various forms locally based on the SDK API and development specifications. 9. The cloud heterogeneous virtualized digital simulation platform according to claim 1, wherein the self-defined network communication protocol specifically includes: Internal communication protocol, which is a protocol for information exchange between the cloud platform access framework and the cloud virtual machine generation and operating environment. It is a TCP-based user layer protocol with two connection modes: control flow and data flow; The control flow connection is used to transmit the configuration information generated by the virtual machine, and the operation instructions include the startup, suspension, restart and shutdown of the virtual machine, dynamic function integration information, and operation return codes; Virtual machine generation configuration information includes: stream ID, virtual machine ID, CPU architecture, development board architecture, number and size of memory slots, hard disk type and capacity, network mode, serial port baud rate, operating system type and version, IP address, GDB Port number, host environment, interaction mode, virtual machine startup mode; Operation command information includes: stream ID, virtual machine ID, operation mode including start, suspend, restart, shutdown; Dynamic function integration information includes: stream ID, virtual machine ID, service name, open source tool chain name; The operation return code includes: stream ID, virtual machine ID, and operation result information; The data flow connection transmits the information input by the user to the virtual machine and the information output by the virtual machine; The information grid input by the user to the virtual machine includes: stream ID, virtual machine ID, and input data information; The virtual machine output information includes: flow ID, virtual machine ID, output data information; User communication protocol. This protocol is a protocol for information exchange between the local user access interface and the cloud platform access framework. It is also a TCP-based user layer protocol, used for user login access and virtual machine information transmission; login access transmission is Control the user's registration and login, and the data information of authority access; the virtual machine information transmits the information about the interaction between the user and the virtual machine, including the content input by the user to the virtual machine and the output returned by the virtual machine; Access request content includes: stream ID, operation type including user registration, user login, cloud verification, data sender ID, data receiver ID, user account, user password, request status information; Virtual machine information includes: stream ID, data sender ID, data receiver ID, virtual machine configuration data, virtual machine ID, virtual machine input data, virtual machine output data; The content of the virtual machine status query and control request includes: stream ID, data sender ID, data receiver ID, virtual machine ID, query and control instructions; In addition, for data transmission, the platform adopts the RSA asymmetric encryption algorithm to ensure the security of data transmission, and at the same time optimizes the encryption and decryption process of the algorithm to improve the efficiency of platform data transmission. 10. The cloud-based heterogeneous virtualization digital simulation platform according to claim 9, wherein the local user access interface supports users to query and control the state of the remote virtual machine locally, and the state of the virtual machine includes power-on, running , shut down, hang up, the user sends the virtual machine status query request as claimed in claim 9 to the virtual machine management submodule, the virtual machine query parameter in the virtual machine management submodule parses the request, obtains the target virtual machine ID, and sends the virtual machine The generation and operation environment forwards the query request, the virtual machine generation and operation environment queries the status of the virtual machine process in the host machine, and returns the query result to the user through the data stream connection; the user sends the status as described in claim 9 to the virtual machine management submodule Control request, the virtual machine management sub-module parses the virtual machine control parameters in the request, and sends virtual machine control operation instructions to the virtual machine generation and operating environment according to the parameter content, so as to realize the virtual machine startup, shutdown, and suspension operations.

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