CN101059762A - Dummy machine system and its video card access method - Google Patents
Dummy machine system and its video card access method Download PDFInfo
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Abstract
The invention discloses a virtual machine system and a relative display card access method, wherein the system comprises VMM, SOS and at least one GOS, the GOS via the DM of the SOS obtain display card information to distributed resource for the display card, and sends the resource distribution to the DM, the DM based on the resource distribution of the SOS on the display card and the resource distribution of GOS on the display card generates a resource convert list to be sent to the VMM, a resource convert module of the VMM based on the resource convert list processes IO address conversion or projects MMIO to physical MMIO of the display card based on the display card access on the display card access data of GOS, to send processed data to the display card. The invention can make each operation system watch real display card, via which the operation systems use the display card via switch, to utilize the hardware accelerate character of the display card to confirm the display property.
Description
Technical field
The present invention relates to computer realm, particularly relate to a kind of dummy machine system and graphics card access method thereof.
Background technology
Along with the development of computer system, Intel Virtualization Technology is used widely in computer realm.Modern computer has had ability and has utilized Intel Virtualization Technology to support a plurality of virtual machines, and on each virtual machine the independent operating system of each self-operating.
In dummy machine system, each operating system all needs hardware is conducted interviews, wherein to the visit of video card be comparatively speaking a more complicated problem, be a key factor that influences user experience to the different using method of video card.At present, VMWare, the scheme that main flow Intel Virtualization Technologies such as Virtual PC and Xen are adopted is similar, and all being provides a virtual video card for client operating system (GOS).This virtual video card is a general video card, can only realize basic Presentation Function, and is very big with real video card difference.
Fig. 1 is the synoptic diagram of the dummy machine system of prior art.This dummy machine system comprises virtual machine monitor (VMM), service operations system (SOS) and at least one GOS.When SOS started, the scanning pci bus was found true video card, obtains true video card information, was true video card Resources allocation (IRQ, IO, MMIO), and SOS drives by true video card video card is conducted interviews.SOS comprises a device model (DM), and DM provides a virtual video card for each GOS.When GOS starts, scan virtual pci bus, find virtual video card, obtain virtual video card information, be virtual video card Resources allocation (IRQ, IO, MMIO).When GOS passes through the driving accesses virtual video card of virtual video card, visit data is sent to DM by VMM; After DM changes visit data, send to true video card and drive; After handling the data that receive, true video card driving sends to video card.
This dummy machine system comprises a plurality of GOS, and each GOS operating system all is to use video card by SOS.So, except SOS can see true video card, and utilize outside the driving visit video card of true video card, what each GOS saw all is the virtual video card that is provided by DM, utilizes virtual video card to drive video card is conducted interviews, like this, the hardware-accelerated characteristic of video card can't be used by the user, even do not support the function of 3D animation, influenced display performance, the impression of user on video card also had a greatly reduced quality.
Summary of the invention
The object of the present invention is to provide a kind of dummy machine system, the GOS in this dummy machine system can see true video card, and drives the visit video card by true video card.
Another order of the present invention is to provide a kind of dummy machine system graphics card access method.
Dummy machine system of the present invention comprises virtual machine monitor (VMM), service operations system (SOS) and at least one client operating system (GOS), wherein:
Described VMM comprises communication module, and this communication module is used for the communication between VMM and SOS and each GOS;
Described SOS comprises DM, and this DM is used to obtain video card information;
Described GOS visits DM by communication module, obtains video card information, and video card is carried out resource distribution, and resource allocation information is sent to DM by communication module, and described GOS comprises that also video card drives, and is used for the video card visit data of GOS is sent to VMM;
DM among the described SOS also is used to obtain SOS to the resource allocation information of video card and the GOS resource allocation information to video card, and according to SOS the resource allocation information of video card and GOS is generated resource conversion table to the resource allocation information of video card and send to VMM;
Described VMM also comprises the resource modular converter, be used for according to resource conversion table the video card visit data from GOS being carried out the ground conversion of IO address or MMIO being mapped to the physics MMIO of video card, and the data after will handling sends to video card.
The IRQ of the video card that described resource modular converter further receives VMM sends to GOS after converting the interrupt number of GOS to; Described GOS further drives the IRQ that handles the video card that is sended over by VMM by video card.
The corresponding relation, the corresponding relation of IRQ and the corresponding relation of MMIO that comprise the IO that SOS and GOS distribute video card respectively in the described resource conversion table.
Described VMM operates in high memory, and described GOS operates in the low memory.
Further, described SOS also comprises the keyboard handover module, described VMM also comprises handover module and access control module, described SOS and described GOS also comprise video card register holds/recovery module, described keyboard handover module is used to receive keyboard input signal, judge whether this signal is system's switching signal, and the handover information of system's switching signal correspondence is sent to handover module by communication module; Described handover module is used for sending video card register holds/restoring signal to video card register holds/recovery module according to handover information by communication module, and sends the access control signal to the visit control module; Described access control module is used for according to the access rights of access control signal change operating system to video card; Described video card register holds/recovery module is used for the value of video card register is preserved or recovering according to video card register holds/restoring signal, and sends the video card register holds by communication module and become function signal or video card register to revert to function signal to handover module.
Described access control module is when receiving the access control signal, if the operating system that the AM/BAM state changes is GOS, send corresponding control signal to the resource modular converter, the resource modular converter is forbidden the resource conversion table of consistency operation system and is enabled the resource conversion table of foregrounding system according to control signal.
Described access control module is when receiving the access control signal, if the operating system that the AM/BAM state changes is SOS, sends corresponding control signal and drives to the video card among the SOS, is driven by this video card and opens or closes the access rights of SOS to video card.
Described handover module is judged the operating system that the AM/BAM state changes according to handover information, send the video card register holds/recovery module of video card register holds signal, send the video card register holds/recovery module of video card register restoring signal to the operating system that switches to the foreground to the operating system that switches to the backstage.
Further, described GOS and SOS also comprise video memory preservation/recovery module, and described handover module further sends video memory preservation/restoring signal to video memory preservation/recovery module according to handover information by communication module; Described video memory preservation/recovery module is preserved the content of video memory according to video memory preservation/restoring signal or is recovered.
Described handover module is judged the operating system that the AM/BAM state changes according to handover information, send video memory and preserve the video memory preservation/recovery module of signal, send the video memory preservation/recovery module of video memory restoring signal to the operating system that switches to the foreground to the operating system that switches to the backstage.
Dummy machine system graphics card access method of the present invention may further comprise the steps:
A) the video card visit data of GOS drives by video card and sends to VMM;
B) VMM carries out the physics MMIO that video card was changed or MMIO was mapped on ground, IO address according to pre-configured resource conversion table to the video card visit data from GOS;
C) data after VMM will handle send to video card.
Further, after step c), also comprise step:
D) VMM receives the IRQ of video card, and sends to GOS after this IRQ being converted to the interrupt number of GOS according to resource conversion table.
The layoutprocedure of described resource conversion table is:
1) SOS obtains video card information, is the video card Resources allocation;
2) GOS obtains video card information by the DM among the SOS, is the video card Resources allocation;
3) DM generates resource conversion table to the resource allocation information of video card and GOS to the resource allocation information of video card according to SOS and sends to VMM.
Further, before step a), also comprise step:
When the foregrounding system switches to the backstage, preserve display mode, when the consistency operation system switches to the foreground, recover display mode.
Further, before step a), also comprise step:
When the foregrounding system switches to the backstage, preserve the content of video memory, when the consistency operation system switches to the foreground, recover the content of video memory.
Compared with prior art, in dummy machine system of the present invention and the graphics card access method thereof, what each operating system was seen all is true video card, uses video card by the mode of switching between each operating system, can utilize the hardware-accelerated characteristic of video card, guarantee display performance.
Description of drawings
Fig. 1 is the synoptic diagram of the dummy machine system of prior art;
Fig. 2 is the synoptic diagram of dummy machine system of the present invention;
Fig. 3 is the improved synoptic diagram to dummy machine system shown in Figure 2;
Fig. 4 is the processing flow chart of keyboard handover module in the improved dummy machine system;
Fig. 5 is the processing flow chart of handover module in the improved dummy machine system;
Fig. 6 is the processing flow chart of register holds in the improved dummy machine system/recovery module;
Fig. 7 is the processing flow chart of access control module in the improved dummy machine system.
Embodiment
Describe the present invention below with reference to accompanying drawing.
As shown in Figure 2, dummy machine system of the present invention comprises virtual machine monitor (VMM), service operations system (SOS) and at least one client operating system (GOS), wherein:
Described VMM comprises communication module, and this communication module is used for the communication between VMM and SOS and each GOS;
Described SOS comprises DM, and this DM is used to obtain video card information;
Described GOS visits DM by communication module, obtains video card information, and video card is carried out resource distribution, and resource allocation information is sent to DM by communication module, and described GOS comprises that also video card drives, and is used for the video card visit data of GOS is sent to VMM;
DM among the described SOS also is used to obtain SOS to the resource allocation information of video card and the GOS resource allocation information to video card, and according to SOS the resource allocation information of video card and GOS is generated resource conversion table to the resource allocation information of video card and send to VMM;
Described VMM also comprises the resource modular converter, be used for according to resource conversion table the video card visit data from GOS being carried out the ground conversion of IO address or MMIO being mapped to the physics MMIO of video card, and the data after will handling sends to video card.
Further, the IRQ of described resource modular converter video card that VMM is received sends to GOS after converting the interrupt number of GOS to; Described GOS drives the IRQ that handles the video card that is sended over by VMM by video card.
In the present invention, for guaranteeing direct memory visit (DMA), allow VMM operate in high memory, GOS operates in the low memory.The physical memory addresses of GOS is consistent with the memory address of machine like this, and GOS does not need to revise the needs that just can satisfy DMA, and SOS is the system of revising, and also can satisfy the needs of DMA.Those of ordinary skill in the art should understand easily, GOS also can not operate in the low memory, when particularly moving a plurality of GOS simultaneously, and can be by interception DMA instruction in VMM, revise memory address and solve the DMA problem, perhaps directly revise among the GOS processing about internal memory.
Wherein, in communication module, VMM communicates by letter with GOS with SOS by interruption or event channel (Event Channel), and SOS communicates by letter with VMM by hypercall, and GOS communicates by letter with VMM by vmcall.
Because GOS may be inconsistent to the resource distribution of video card with SOS to the resource distribution of video card, GOS just need carry out the resource conversion earlier if will directly conduct interviews to video card, and this work is finished by the resource modular converter.When coming from the video card visit data arrival VMM of GOS, the resource modular converter is searched the resource transformational relation in resource conversion table, the IO request address of GOS is changed into the true IO address of video card, simultaneously GOS is mapped on the physics MMIO of video card the MMIO that video card distributes, and the IRQ of the video card that VMM is received sends to GOS after converting the interrupt number of GOS to.
Resource conversion table is to produce in the resource distribution process to video card.Layoutprocedure is: SOS starts, and the scanning pci bus is obtained video card information, is video card Resources allocation (IRQ, IO, MMIO); GOS starts, and scans virtual pci bus, and discovery is obtained video card information by the true video card that DM provides, and is video card Resources allocation (IRQ, IO, MMIO); GOS is responsible for parsing to the resources allocation of video card by DM, and DM generates resource conversion table to the resource allocation information of video card and GOS to the resource allocation information of video card according to SOS and sends to VMM.The corresponding relation, the corresponding relation of IRQ and the corresponding relation of MMIO that comprise the IO that SOS and GOS distribute video card respectively in this resource conversion table.
Like this, by the assistance of DM and VMM, GOS can directly have access to video card hardware, and simultaneously, SOS visits video card hardware according to the mode of original triangular web.
The phenomenon that a plurality of operating systems are write screen simultaneously may appear in dummy machine system shown in Figure 2, and when the consistency operation system switched to the foreground, display mode also may change, and need reset display mode, and these have all brought inconvenience to use.In view of this, a kind of improvement project is below proposed.
Fig. 3 is the improvement of dummy machine system shown in Figure 2, and in this dummy machine system, SOS further comprises the keyboard handover module, and VMM further comprises handover module and access control module, and SOS and GOS further comprise video card register holds/recovery module, wherein:
Described keyboard handover module is used to receive keyboard input signal, judges whether this signal is system's switching signal, and the handover information of system's switching signal correspondence is sent to handover module by communication module;
Described handover module is used for sending video card register holds/restoring signal to video card register holds/recovery module according to handover information by communication module, and sends the access control signal to the visit control module;
Described access control module is used for according to the access rights of access control signal change operating system to video card;
Described video card register holds/recovery module is used for the value of video card register is preserved or recovering according to video card register holds/restoring signal, and sends the video card register holds by communication module and become function signal or video card register to revert to function signal to handover module.
Respectively the treatment scheme of above-mentioned each module is specifically described below.
As shown in Figure 4, the treatment scheme of keyboard handover module is: receive keyboard input signal, the keyboard interrupt handling procedure judges whether this signal is system's switching signal, if, send the corresponding handover module that handovers information to by communication module, otherwise, processing imported normally.
As shown in Figure 5, the treatment scheme of handover module is: after receiving the handover information from the keyboard handover module, judge the operating system that the AM/BAM state changes according to handover information, send the video card register holds/recovery module of video card register holds signal to the operating system that switches to the backstage, receive after the video card register holds becomes function signal, send the access control signal to the visit control module, then, send the video card register holds/recovery module of video card register restoring signal, and reception video card register reverts to function signal to the operating system that switches to the foreground.
As shown in Figure 6, the treatment scheme of video card register holds/recovery module is: after receiving video card register holds/restoring signal, judge whether to preserve the value of video card register, if receive video card register holds signal, call VGA BIOS service the value of video card register is preserved, and become function signal to handover module by communication module transmission video card register holds; If receive video card register restoring signal, call VGA BIOS service the value of video card register is recovered, and revert to function signal to handover module by communication module transmission video card register.
As shown in Figure 7, after access control module receives the access control signal, judge that at first the operating system that the AM/BAM state changes is GOS or SOS, GOS is carried out different processing with SOS.
For GOS, send corresponding control signal to the resource modular converter, the resource modular converter is forbidden the resource conversion table of consistency operation system and is enabled the resource conversion table of foregrounding system according to control signal.For SOS, send corresponding control signal and drive to the video card among the SOS, drive by this video card and open or close the access rights of SOS video card.If described SOS switches to the foreground, the video card of this SOS drives opens its access rights to video card, if described SOS switches to the backstage, the video card of this SOS drives closes its access rights to video card.
Improved dummy machine system has solved a plurality of operating systems and has switched the problem of using video card, and the operating system that promptly only is positioned at the foreground could be visited video card, the situation that a plurality of operating systems are write screen simultaneously can not occur.And,, make the display mode that switches each operating system when using video card remain unchanged by the preservation and the recovery of video card register.
But after system was switched, if do not carry out screen-refresh, because the content of video memory is not upgraded, the display content displayed was the content before switching.With the preservation of video card register with recover similar, but preservation and recovery head it off by video memory.
Promptly in GOS and among the SOS, can further include video memory preservation/recovery module, handover module sends video memory preservation/restoring signal to video memory preservation/recovery module, and video memory preservation/recovery module is preserved the content of video memory according to video memory preservation/restoring signal or recovered.Handover module is judged the operating system that the AM/BAM state changes according to handover information, send video memory and preserve the video memory preservation/recovery module of signal, send the video memory preservation/recovery module of video memory restoring signal to the operating system that switches to the foreground to the operating system that switches to the backstage.Video memory preservation/recovery module is preserved the content of video memory when receiving video memory preservation signal, when receiving the video memory restoring signal, the content of video memory is recovered.
Dummy machine system graphics card access method of the present invention may further comprise the steps:
A) the video card visit data of GOS drives by video card and sends to VMM;
B) VMM carries out the physics MMIO that video card was changed or MMIO was mapped on ground, IO address according to pre-configured resource conversion table to the video card visit data from GOS;
C) data after VMM will handle send to video card.
Further, after step c), also comprise step:
D) VMM receives the IRQ of video card, and sends to GOS after this IRQ being converted to the interrupt number of GOS according to resource conversion table.
Wherein, the corresponding relation, the corresponding relation of IRQ and the corresponding relation of MMIO that comprise the IO that SOS and GOS distribute video card respectively in the described resource conversion table.For guaranteeing DMA, allow VMM operate in high memory, GOS operates in the low memory, the front has made referrals to GOS also can not operate in the low memory, when particularly moving a plurality of GOS simultaneously, can revise memory address and solve the DMA problem by interception DMA instruction in VMM, perhaps directly revise among the GOS processing about internal memory.
The layoutprocedure of described resource conversion table is:
1) SOS obtains video card information, is the video card Resources allocation;
2) GOS obtains video card information by the DM among the SOS, is the video card Resources allocation;
3) DM generates resource conversion table to the resource allocation information of video card and GOS to the resource allocation information of video card according to SOS and sends to VMM.
Further, before step a), also comprise step:
When the foregrounding system switches to the backstage, preserve display mode, when the consistency operation system switches to the foreground, recover display mode.
Further, before step a), also comprise step:
When the foregrounding system switches to the backstage, preserve the content of video memory, when the consistency operation system switches to the foreground, recover the content of video memory.
Use method of the present invention, the foregrounding system is complete in independently operating system is suitable to the operation of video card to the operation of video card, can use the whole hardware-accelerated characteristic of video card.When an operating system breaks down, can not influence the demonstration of other operating system.Can make the control of other operating system acquisition by switching to video card.
Dummy machine system of the present invention and video card using method thereof, virtual video card type no longer is provided, GOS can see real physics video card, the display content displayed is by the switching controls of VMM according to system, all the time show the system for content that switches to the foreground, and can use hardware-accelerated characteristic, guaranteed display performance.
Should be noted that at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spiritual scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (17)
1. a dummy machine system comprises virtual machine monitor VMM, the SOS of service operations system and at least one client operating system GOS, wherein,
Described VMM comprises communication module, and this communication module is used for the communication between VMM and SOS and each GOS;
Described SOS comprises device model DM, and this DM is used to obtain video card information;
It is characterized in that:
Described GOS visits DM by communication module, obtains video card information, and video card is carried out resource distribution, and resource allocation information is sent to DM by communication module, and described GOS comprises that also video card drives, and is used for the video card visit data of GOS is sent to VMM;
DM among the described SOS also is used to obtain SOS to the resource allocation information of video card and the GOS resource allocation information to video card, and according to SOS the resource allocation information of video card and GOS is generated resource conversion table to the resource allocation information of video card and send to VMM;
Described VMM also comprises the resource modular converter, be used for according to resource conversion table the video card visit data from GOS being carried out the ground conversion of IO address or MMIO being mapped to the physics MMIO of video card, and the data after will handling sends to video card.
2. the system as claimed in claim 1 is characterized in that:
The IRQ of the video card that described resource modular converter further receives VMM sends to GOS after converting the interrupt number of GOS to;
Described GOS further drives the IRQ that handles the video card that is sended over by VMM by video card.
3. system as claimed in claim 1 or 2 is characterized in that:
The corresponding relation, the corresponding relation of IRQ and the corresponding relation of MMIO that comprise the IO that SOS and GOS distribute video card respectively in the described resource conversion table.
4. system as claimed in claim 1 or 2 is characterized in that:
Described VMM operates in high memory, and described GOS operates in the low memory.
5. system as claimed in claim 1 or 2 is characterized in that:
Described SOS further comprises the keyboard handover module, and described VMM further comprises handover module and access control module, and described SOS and described GOS further comprise video card register holds/recovery module,
Described keyboard handover module is used to receive keyboard input signal, judges whether this signal is system's switching signal, and the handover information of system's switching signal correspondence is sent to handover module by communication module;
Described handover module is used for sending video card register holds/restoring signal to video card register holds/recovery module according to handover information by communication module, and sends the access control signal to the visit control module;
Described access control module is used for according to the access rights of access control signal change operating system to video card;
Described video card register holds/recovery module is used for the value of video card register is preserved or recovering according to video card register holds/restoring signal, and sends the video card register holds by communication module and become function signal or video card register to revert to function signal to handover module.
6. system as claimed in claim 5 is characterized in that:
Described access control module is when receiving the access control signal, if the operating system that the AM/BAM state changes is GOS, send corresponding control signal to the resource modular converter, the resource modular converter is forbidden the resource conversion table of consistency operation system and is enabled the resource conversion table of foregrounding system according to control signal.
7. system as claimed in claim 5 is characterized in that:
Described access control module is when receiving the access control signal, if the operating system that the AM/BAM state changes is SOS, sends corresponding control signal and drives to the video card among the SOS, is driven by this video card and opens or closes the access rights of SOS to video card.
8. system as claimed in claim 5 is characterized in that:
Described handover module is judged the operating system that the AM/BAM state changes according to handover information, send the video card register holds/recovery module of video card register holds signal, send the video card register holds/recovery module of video card register restoring signal to the operating system that switches to the foreground to the operating system that switches to the backstage.
9. system as claimed in claim 5 is characterized in that:
Described GOS and SOS further comprise video memory preservation/recovery module;
Described handover module further sends video memory preservation/restoring signal to video memory preservation/recovery module according to handover information by communication module;
Described video memory preservation/recovery module is preserved the content of video memory according to video memory preservation/restoring signal or is recovered.
10. system as claimed in claim 9 is characterized in that:
Described handover module is judged the operating system that the AM/BAM state changes according to handover information, send video memory and preserve the video memory preservation/recovery module of signal, send the video memory preservation/recovery module of video memory restoring signal to the operating system that switches to the foreground to the operating system that switches to the backstage.
11. a dummy machine system graphics card access method is characterized in that, may further comprise the steps:
A) the video card visit data of GOS drives by video card and sends to VMM;
B) VMM carries out the physics MMIO that video card was changed or MMIO was mapped on ground, IO address according to pre-configured resource conversion table to the video card visit data from GOS;
C) data after VMM will handle send to video card.
12. method as claimed in claim 11 is characterized in that, also comprises step after step c):
D) VMM receives the IRQ of video card, and sends to GOS after this IRQ being converted to the interrupt number of GOS according to resource conversion table.
13., it is characterized in that as claim 11 or 12 described methods:
The corresponding relation, the corresponding relation of IRQ and the corresponding relation of MMIO that comprise the IO that SOS and GOS distribute video card respectively in the described resource conversion table.
14., it is characterized in that as claim 11 or 12 described methods:
Described VMM operates in high memory, and described GOS operates in the low memory.
15., it is characterized in that the layoutprocedure of described resource conversion table is as claim 11 or 12 described methods:
1) SOS obtains video card information, is the video card Resources allocation;
2) GOS obtains video card information by the DM among the SOS, is the video card Resources allocation;
3) DM generates resource conversion table to the resource allocation information of video card and GOS to the resource allocation information of video card according to SOS and sends to VMM.
16. as claim 11 or 12 described methods, it is characterized in that, before step a), also comprise step:
When the foregrounding system switches to the backstage, preserve display mode, when the consistency operation system switches to the foreground, recover display mode.
17. as claim 11 or 12 described methods, it is characterized in that, before step a), also comprise step:
When the foregrounding system switches to the backstage, preserve the content of video memory, when the consistency operation system switches to the foreground, recover the content of video memory.
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