CN102243571A - Embedded Hypervisor-oriented multi-window display virtual operation method - Google Patents
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Abstract
The invention discloses an embedded hypervisor-oriented multi-window display virtual operation method. Virtual display equipment and virtual display service in virtual display driving management are created in a domain in which GuestOS on Hypervisor is located; a display interface is arranged in a hardware abstraction layer of the Hypervisor, the display interface is an encapsulation of a physical display equipment window operation, and operation on a window register of a physical display equipment controller is completed after the display interface is called and operated. By virtue of virtual hardware display, multiple GuestOS can use hardware display in a time-sharing way, the windows are uniformly managed in a Hypervisor layer by virtue of the hardware abstraction layer, coupling degree of systems is reduced, and system display is more stable.
Description
Technical field
The invention belongs to embedded type virtual machine technology field, relate to a kind of many forms and show the virtualization operations method towards embedded Hypervisor.
Background technology
In I type Hypervisor system, Hypervisor runs directly on the hardware platform as system software, directly managing physical equipment and support operate in the operating system GuestOS (client operating system) on the Hypervisor, and the interface that provides by Hypervisor is the GuestOS service.Hardware abstraction layer is the interface layer between operating system nucleus and hardware device, and its purpose is hardware abstractionization.It has hidden the hardware interface details of particular platform, for operating system provides the virtual hardware platform, makes it have hardware independence, can transplant on kinds of platform.
LCD is virtual, and to belong to I/O virtual, is the ingredient of embedded type virtualization.For the virtual demonstration of LCD, popular virtualization scheme has VMware, Xen, Virtual Logic etc. now, VMware belongs to fully virtualized scheme, can move not modified Guest OS, promptly can not add being applied in the virtual machine environment of modification to former LCD device drives, but its complex structure is very high to hardware requirement, is not suitable for being applied to embedded.Xen has half virtualization scheme, and Guest OS can run on the Xen after revising, but it is mainly towards PC and server field, does not release ripe product as yet in built-in field.
Nowadays the management to LCD equipment in embedded is more flexible, as lcd controller on the S3C6410 platform five layers of form are arranged, can be used separately as different demonstrations to each layer window like this, be used as the OS window as windows, window1 is as the TV screen, and window2 is as menu window or the like.
Summary of the invention
The problem that the present invention solves is to provide a kind of many forms towards embedded Hypervisor to show the virtualization operations method, show by virtual hardware, make a plurality of GuestOS timesharing share the demonstration of use hardware, by hardware abstraction layer form is carried out unified management at the Hypervisor layer, reduced the degree of coupling between the system, the demonstration of system is more stable.
The present invention is achieved through the following technical solutions:
A kind of many forms towards embedded Hypervisor show the virtualization operations method, may further comprise the steps:
1) virtual display device and the virtual demonstration that managed by virtual display driver being created in the territory, GuestOS place on the Hypervisor serves; Virtual display device is a structure, is abstract to the attribute of physical display device; Virtual demonstration service is one group of thread, is abstract to physical display device operation;
2) in the hardware abstraction layer of Hypervisor display interface is set, display interface is an encapsulation to the physical display device window-operating, after display interface is called operation, finishes the form operation registers to the physical display device controller;
3) when physical display device need be operated, the virtual display driver accesses virtual display device among the GuestOS is kept at display message in the virtual display device, and virtual display driver also wakes the execution of virtual demonstration service up by sending message; When virtual demonstration service is waken up executable operations, obtain facility information by the accesses virtual display device; After obtaining facility information, virtual demonstration service is carried out operation to physical display device by calling display interface in the hardware abstraction layer;
4) after display interface was called, according to implementation status, return result gave virtual demonstration service, and virtual demonstration service returns to virtual display driver by the mode of acknowledgement messaging.
Attribute information or display message to physical display device that described virtual display device is preserved comprise: screen location information, screen size information, window number, video memory address and pixel and display characteristic;
Virtual display driver to the management of virtual display device is: the accesses virtual display device is kept at display message in the middle of the virtual display device, so that the visit of virtual demonstration service.
After described virtual demonstration service was waken up, the accesses virtual display device carried out following operation to display interface after obtaining facility information: variable element, initialization display window are set, close display window and Framebuffer is set based on detecting variable element.
The operation to the physical display device form of described display interface encapsulation comprises: physical display device initialization, physical display device shutoff operation, activation physical display device parameter and equipment video memory address.
A described GuestOS finishes the operation of a form layer on the physical display device to the operation of physical display device by calling of display interface; When different system need be switched demonstration, by the parameter of display interface operating physical display device, the pairing form layer of system was switched, and system's demonstration just has been switched.
After described display interface is called, finish form operation registers,, realize the switching of different forms by revising form stack parameter to the physical display device controller.
Described GuestOS is Linux, the LCD of physical display device for supporting that many forms show.
Compared with prior art, the present invention has following beneficial technical effects:
Many forms towards embedded Hypervisor provided by the invention show the virtualization operations method, creating the virtual display device and the virtual demonstration that managed by virtual display driver in territory, GuestOS place serves, display interface is set in the hardware abstraction layer of Hypervisor carries out physical operations, a physical equipment can be mapped as a plurality of virtual units, thereby make a plurality of Guest OS use physics LCD equipment simultaneously, a plurality of GuestOS can timesharing share the use physical display device, and the demonstration of being convenient to different system is simultaneously switched.
Many forms towards embedded Hypervisor provided by the invention show the virtualization operations method, be that each Guest OS distributes a display window in hardware abstraction layer, the work of carrying out when carrying out system's switching demonstration is exactly the parameter of simply revising in the display controller, thereby changes window displayed.Use same window with respect to a plurality of Guest OS timesharing, this machine-processed principal character is that different systems independently operates at form separately, reduced the degree of coupling between the system, simultaneously by hardware abstraction layer form is carried out unified management at the Hypervisor layer, be easy to transplant, and the switching between system is rapider, smooth, and the demonstration of system is more stable, and the performance of system is more efficient.Compare with Xen with VMware and to have lower performance loss, the characteristics that are easy to transplant.
Description of drawings
Fig. 1 is the Hypervisor structural drawing;
Fig. 2 is for supporting that many forms show virtualized Hypervisor structural drawing;
Fig. 3 execution mechanism synoptic diagram that to be virtual display driver show by virtual demonstration service execution system;
Fig. 4 obtains after the display message operation chart to display interface for virtual demonstration service;
Fig. 5 is based on the virtual display system of the many forms of hardware and the synoptic diagram of execution thereof.
Embodiment
Many forms towards embedded Hypervisor provided by the invention show the virtualization operations method, and by the physical vlan display device, a plurality of GuestOS can timesharing share the use physical display device, and the demonstration of being convenient to different system is simultaneously switched.Many forms show that virtualization operations comprises that mainly following two aspect: Hypervisor produce the operation of keeping supplying layer GuestOS virtual unit that drives and the display interface that passes through hardware abstraction layer and realize the mapping of virtual display device to different forms.Below in conjunction with GuestOS is Linux (2.6.28 kernel), the LCD of physical display device for supporting that many forms show, and the present invention is described in further detail, and the explanation of the invention is not limited.
Referring to I type Hypervisor structural drawing shown in Figure 1, Hypervisor runs directly on the hardware platform as system software, directly managing physical equipment and support operate in the operating system GuestOS on the Hypervisor, and the interface that provides by Hypervisor is the GuestOS service.
Show virtualized Hypervisor structural drawing referring to the many forms of support shown in Figure 2, create served by the virtual display device and the virtual demonstration of virtual display driver management in territory, GuestOS place, in the hardware abstraction layer of Hypervisor, display interface is set.
A) virtual display driver
The operand of the virtual display driver among the GuestOS is a virtual display device, thereby wakes the operation that the execution of virtual demonstration service realizes virtual display device up by sending message.
Virtual display driver wakes the execution of virtual demonstration service up by sending message, and then realizes the operation of virtual display device by the execution of virtual demonstration service.Virtual demonstration service is kept at display message in the virtual display device by visit to be carried out the calling of display interface, thereby finishes access hardware.Concrete in Linux, to the operation of physical display device, be put into hardware abstraction layer and realize during original display device driven, in Linux, only keep the framework of original display driver, realize virtual display driver.
Virtual display driver is to the visit of virtual display device, display message is kept in the middle of the virtual display device, so that the visit of virtual demonstration service.
B) virtual display device
Virtual display device is abstract to the attribute of physical display device, is realized by a structure.Virtual display driver among the GuestOS is responsible for the operation to virtual display device, is used for facility information is kept at virtual display device.When virtual demonstration service needs executable operations, obtain facility information by the accesses virtual display device.
C) virtual demonstration service
Virtual demonstration service is the one group of abstract thread that is used for the physical display device operation, and it is representing the execution of virtual display device.The execution of virtual demonstration service is waken up by the virtual display driver among the GuestOS.Virtual demonstration service is carried out operation to hardware by the display interface in the hardware abstraction layer that calls Hypervisor and provide.
Attribute information or display message to physical display device that virtual display device is preserved comprise:
1) screen location information; 2) screen size information; 3) window number; 4) video memory address is used for the DMA reading of data; 5) pixel and display characteristic.
The operation of virtual demonstration service execution comprises:
1) based on detecting variable element variable element is set; 2) initialization display window; 3) close display window; 4) Framebuffer is set.
The operation of above-mentioned attribute that is stored in virtual display device and virtual demonstration service execution is based on all that the general character of LCD equipment puts forward, so these attribute and operation can correspond on the concrete physical equipment.
D) display interface
Display interface is an encapsulation to the physical display device window-operating, so that virtual this interface of demonstration service call is operated form.The encapsulation of display interface comprises: LCD initialization, LCD shutoff operation, activation LCD parameter, four aspects, equipment video memory address.
Display interface is finished the form operation registers to lcd controller.By revising the parameter that superposes in the form register, realize the switching of different form layers, show with this switching that realizes different system.
After display interface was called, according to implementation status, return result gave virtual demonstration service, and virtual demonstration service returns to virtual display driver by the mode of acknowledgement messaging.
Referring to Fig. 2, Fig. 3, Fig. 4, the many forms demonstration virtualization operations methods towards embedded Hypervisor may further comprise the steps:
1) virtual display device and the virtual demonstration that managed by virtual display driver being created in the territory, GuestOS place on the Hypervisor serves; Virtual display device is a structure, is abstract to the attribute of physical display device; Virtual demonstration service is one group of thread, is abstract to physical display device operation;
2) in the hardware abstraction layer of Hypervisor display interface is set, display interface is an encapsulation to the physical display device window-operating, after display interface is called operation, finishes the form operation registers to the physical display device controller;
3) when physical display device need be operated, the virtual display driver accesses virtual display device among the GuestOS is kept at display message in the virtual display device, and virtual display driver also wakes the execution of virtual demonstration service up by sending message; When virtual demonstration service is waken up executable operations, obtain facility information by the accesses virtual display device; After obtaining facility information, virtual demonstration service is carried out operation to physical display device by calling display interface in the hardware abstraction layer;
4) after display interface was called, according to implementation status, return result gave virtual demonstration service, and virtual demonstration service returns to virtual display driver by the mode of acknowledgement messaging.
In conjunction with above accompanying drawing and operation, as can be seen: when the virtual display driver that is in the linux kernel attitude needs the accesses virtual display device, by sending the virtual demonstration service of message request to the Hypervisor end, virtual demonstration service is handled this message, each message correspondence be operation to physical display device, by display interface physical display device is conducted interviews here.Finish sending the virtual display driver of acknowledgement messaging after the processing of message, thereby finish once visit virtual unit to the Linux end.
Based on the above-mentioned analysis that Linux is held virtual display driver, can draw when carrying out the design of Linux end display routine, at be virtual display device, rather than the physical display device among original Linux.The situation that finally will be mapped to the physical equipment operation for the operation of virtual display device realizes to virtual demonstration service by sending message at the Linux end.
Based on the virtual display system of the many forms of hardware and the synoptic diagram of execution thereof, GuestOS finishes the operation of a form layer on the physical display device to the operation of physical display device by calling of display interface referring to shown in Figure 5; When different system need be switched demonstration, by the parameter of display interface operating physical display device, the pairing form layer of system was switched, and system's demonstration just has been switched.
After display interface is called, finishing the form operation registers to the physical display device controller, specifically is by revising the relevant register of form stack (this register is the window's position control c register), realizing the switching of different form layers.
Hypervisor is responsible for finishing the initialization operation to lcd controller, at this moment an initialization global register.And the configuration of each form layer register is operated by corresponding GuestOS.Therefore many forms of virtual LCD show that being equivalent to each virtual LCD uses wherein one deck form.Different GuestOS as shown in Figure 5 uses different paths (a or b), and different forms is operated, and has reduced the degree of coupling between the system.
Virtual many forms are to be that each system operates separately at form separately in the middle of showing, have reduced the degree of coupling between the system.From hardware, support the lcd controller that many forms show, can for showing, many forms create hardware foundation each layer form as different demonstrations; From software, by the display interface of Hypervisor end, the virtual display driver that is in the linux kernel attitude conducts interviews to physical display device with the form of message, has created basis of software for many forms show.
Claims (7)
1. the many forms towards embedded Hypervisor show the virtualization operations method, it is characterized in that, may further comprise the steps:
1) virtual display device and the virtual demonstration that managed by virtual display driver being created in the territory, GuestOS place on the Hypervisor serves; Virtual display device is a structure, is abstract to the attribute of physical display device; Virtual demonstration service is one group of thread, is abstract to physical display device operation;
2) in the hardware abstraction layer of Hypervisor display interface is set, display interface is an encapsulation to the physical display device window-operating, after display interface is called operation, finishes the form operation registers to the physical display device controller;
3) when physical display device need be operated, the virtual display driver accesses virtual display device among the GuestOS is kept at display message in the virtual display device, and virtual display driver also wakes the execution of virtual demonstration service up by sending message; When virtual demonstration service is waken up executable operations, obtain facility information by the accesses virtual display device; After obtaining facility information, virtual demonstration service is carried out operation to physical display device by calling display interface in the hardware abstraction layer;
4) after display interface was called, according to implementation status, return result gave virtual demonstration service, and virtual demonstration service returns to virtual display driver by the mode of acknowledgement messaging.
2. the many forms towards embedded Hypervisor as claimed in claim 1 show the virtualization operations method, it is characterized in that attribute information or display message to physical display device that described virtual display device is preserved comprise: screen location information, screen size information, window number, video memory address and pixel and display characteristic;
Virtual display driver to the management of virtual display device is: the accesses virtual display device is kept at display message in the middle of the virtual display device, so that the visit of virtual demonstration service.
3. the many forms towards embedded Hypervisor as claimed in claim 1 show the virtualization operations method, it is characterized in that, after described virtual demonstration service was waken up, the accesses virtual display device carried out following operation to display interface after obtaining facility information: variable element, initialization display window are set, close display window and Framebuffer is set based on detecting variable element.
4. the many forms towards embedded Hypervisor as claimed in claim 1 show the virtualization operations method, it is characterized in that the operation to the physical display device form of described display interface encapsulation comprises: physical display device initialization, physical display device shutoff operation, activation physical display device parameter and equipment video memory address.
5. the many forms towards embedded Hypervisor as claimed in claim 1 show the virtualization operations method, it is characterized in that, a described GuestOS finishes the operation of a form layer on the physical display device to the operation of physical display device by calling of display interface; When different system need be switched demonstration, by the parameter of display interface operating physical display device, the pairing form layer of system was switched, and system's demonstration just has been switched.
6. the many forms towards embedded Hypervisor as claimed in claim 1 show the virtualization operations method, it is characterized in that, after described display interface is called, finish form operation registers to the physical display device controller, by revising form stack parameter, realize the switching of different forms.
7. the many forms towards embedded Hypervisor as claimed in claim 1 show the virtualization operations method, it is characterized in that described GuestOS is Linux, the LCD of physical display device for supporting that many forms show.
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| CN107924317B (en) * | 2015-08-31 | 2020-12-22 | 三菱电机株式会社 | Application program execution device and application program execution method |
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| CN109240794A (en) * | 2018-08-06 | 2019-01-18 | 深圳宇翊技术股份有限公司 | A kind of desktop virtual technology reconstruct PIS train station subsystem |
| CN109343929A (en) * | 2018-09-05 | 2019-02-15 | 武汉光庭信息技术股份有限公司 | A kind of multi-screen interaction method and system based on the shared video memory of virtualization |
| CN112948102A (en) * | 2019-11-26 | 2021-06-11 | 中国电信股份有限公司 | Virtual machine event processing method, device and system |
| CN112948102B (en) * | 2019-11-26 | 2023-10-13 | 中国电信股份有限公司 | Virtual machine event processing method, device and system |
| CN111114320A (en) * | 2019-12-27 | 2020-05-08 | 深圳市众鸿科技股份有限公司 | Vehicle-mounted intelligent cabin sharing display method and system |
| CN111240898A (en) * | 2020-01-09 | 2020-06-05 | 中瓴智行(成都)科技有限公司 | Hypervisor-based black box implementation method and system |
| CN111240898B (en) * | 2020-01-09 | 2023-08-15 | 中瓴智行(成都)科技有限公司 | Method and system for realizing black box based on Hypervisor |
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