JP2009258798A - Virtual machine system, host computer, i/o card, virtual machine construction method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a virtual machine system allowing control of possibility/impossibility of use in each virtual machine and in each function of an I/O card without increasing a load of a CPU and cost of the other hardware. <P>SOLUTION: This virtual machine system 1 has: a host computer 2 wherein the plurality of virtual machines 30a, 30b operate; and the I/O card 40 connected to the host computer, providing the plurality of functions to the host computer. The I/O card has a plurality of virtual machine interfaces 42a, 42b corresponding to the plurality of virtual machines, and each having a plurality of pages each corresponding to each of the plurality of functions. Each virtual machine has address conversion parts 34a, 34b for converting between physical addresses on the virtual machine and physical addresses of the pages and the virtual machine interface on the host computer. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a virtual machine that operates on a host computer, and more particularly to the use of an I / O card in a plurality of virtual machines that operate on a host computer.

  The computer virtualization technology is a technology for constructing a virtual computer (virtual machine) on a host computer by software. However, an expansion device (hereinafter referred to as an I / O card) such as a graphic card, a floating point arithmetic accelerator, or a biochemical simulator that is physically connected to the host computer is shared by a plurality of virtual machines. There are also uses that you want to do.

  The following technical documents are available as a technology for using an I / O card from a virtual machine. Patent Document 1 describes a technique in which a program execution interpretation unit interprets the contents of a use prohibition table for a program to be executed so that a function whose use is prohibited is not executed. This technology is also applicable to virtual machines. Patent Document 2 describes a method of performing access control using a server identifier embedded in an access request when a plurality of physical or logical servers share an I / O card.

  In Patent Document 3, a physical address for using an I / O card is notified to a virtual machine, so that the virtual machine does not go through another process such as a virtual machine monitor or a privileged virtual machine. A technique is described in which an I / O card can be used. Patent Document 4 describes a method of migrating a virtual machine running on a computer to another virtual machine.

  Patent Document 5 describes a technique of assigning a correspondence between a virtual I / O address and a physical I / O address and holding the information in order to share an I / O card between a physical machine and a virtual machine. Has been. Patent Document 6 describes a technique of sharing a plurality of functions of an I / O card by associating a virtual address with a physical address in an I / O card having a plurality of functions.

JP 2002-041170 A JP 2005-122640 A JP 2005-322242 A JP 2005-327279 A JP 2008-021252 A Special Table 2007-518160

  When an I / O card has a plurality of functions that are divided into a plurality of sections, even if the virtual machine operates on the same host computer, for example, all the functions of the I / O card are used from a certain virtual machine On the other hand, there is a case where only a specific function of the I / O card can be used from another virtual machine and other functions cannot be used.

  In such a case, as described in Patent Documents 1 and 2, when an access to a specific function occurs, the CPU of the host computer or a dedicated determination circuit determines whether access to the function is permitted. There is technology to judge. However, if the CPU makes such a determination every time an access to the function occurs, the load is further increased even for a CPU that is performing high-load processing for a plurality of virtual machines. Become. In addition, adding a determination circuit that is dedicated hardware leads to an increase in the cost of the device.

  In the method of Patent Document 3, it is determined whether access is possible when an I / O card is allocated to a virtual machine. However, whether or not a single I / O card is occupied is determined. Only control is possible. With the technology combining all of Patent Documents 4 to 6, and further to Patent Documents 1 to 6, it is used for each virtual machine and each function of the I / O card without increasing the CPU load and other hardware costs. There is no description of a technique for enabling control of whether or not the above-mentioned is possible.

  An object of the present invention is to provide a virtual machine system, a host computer, and an I / O capable of controlling the use of each virtual machine and each function of an I / O card without increasing the CPU load and other hardware costs. It is to provide a card, a virtual machine monitoring method, and a program.

  To achieve the above object, a virtual machine system according to the present invention includes a host computer on which a plurality of virtual machines operate, and an I / O card that is connected to the host computer and provides a plurality of functions to the host computer. A virtual machine system, wherein an I / O card corresponds to a plurality of virtual machines, each having a plurality of virtual machine interfaces having a plurality of pages corresponding to a plurality of functions, and each virtual machine And an address conversion unit that converts a physical address on the virtual machine and a physical address of the virtual machine interface and page on the host computer.

  To achieve the above object, a host computer according to the present invention has a plurality of virtual machines on which a plurality of virtual machines operate, correspond to a plurality of virtual machines, and each have a plurality of pages corresponding to a plurality of functions. Host computer to which an I / O card having an interface can be connected, and each virtual machine converts a physical address on the virtual machine and a virtual machine interface and page physical address on the host computer It is characterized by having.

  To achieve the above object, an I / O card according to the present invention is an I / O card that is connected to a host computer on which a plurality of virtual machines operate and provides a plurality of functions to the host computer. It has a plurality of virtual machine interfaces each having a plurality of pages corresponding to each of a plurality of functions corresponding to a virtual machine.

  In order to achieve the above object, a virtual machine construction method according to the present invention corresponds to a plurality of virtual machines, each of which has a plurality of virtual machine interfaces each having a plurality of pages corresponding to a plurality of functions. A method of constructing a plurality of virtual machines on a host computer to which a card is connected, in which an address conversion unit that converts a physical address on the virtual machine and a virtual machine interface and page physical address on the host computer is virtualized. An address conversion unit providing step to be provided to a machine, and an access step in which each virtual machine accesses a page using the address conversion unit.

  To achieve the above object, a virtual machine construction program according to the present invention corresponds to a plurality of virtual machines, each of which has a plurality of virtual machine interfaces each having a plurality of pages corresponding to a plurality of functions. Information indicating that the host computer to which the card is connected can read the information on the availability of each of the functions for each of the plurality of virtual machines included in the host computer, and information that it can be used in the availability reading step. For the read function, the address conversion unit for writing the physical address of the virtual machine interface is executed in the address conversion unit that converts the physical address on the virtual machine and the virtual machine interface and the physical address of the page on the host computer. It is characterized by that.

  In the present invention, each virtual machine is configured to have an address translation unit that translates physical addresses on the virtual machine and on the host computer, so that access to a specific function of the I / O card occurs from the virtual machine. It is not necessary for the CPU to determine the access authority for each function of each virtual machine each time. This makes it possible to control whether or not each virtual machine and each I / O card function can be used without increasing the CPU load and other hardware costs. , An I / O card, a virtual machine monitoring method, and a program can be provided.

[First Embodiment]
FIG. 1 is a block diagram showing the configuration of the virtual machine system 1 according to the first embodiment of the present invention. The virtual machine system 1 is configured by connecting an I / O card 40 to a host computer 2. The host computer 2 is a general computer device and includes a CPU 11, a RAM 12, and a bridge 13. The CPU 11 and the RAM 12 are both general arithmetic devices and storage devices in a computer device, but a plurality of them may be provided.

  The bridge 13 is a device that connects an expansion device and relays it to the CPU 11. The CPU 11 operates the expansion device via the bridge 13 based on a command from software executed on the RAM 12, and the result is displayed. Can be output to the software. It should be noted that elements other than these are also necessary to configure the computer apparatus, but they are well-known to those skilled in the art and are not shown in the figure because they do not need to be mentioned in particular in describing the present embodiment. .

  An I / O card 40 is connected to the bridge 13. The I / O card 40 includes an I / O packet transfer unit 41 and a plurality of virtual machine interfaces 42a to 42n. Each of the plurality of virtual machine interfaces 42a to 42n corresponds to a plurality of virtual machines 30a to 30n described later. The I / O card 40 performs processing in response to a request received from another device via the bridge 13, and then returns an output via the bridge 13.

  In the RAM 12, the virtual machine monitor 20 is executed by the CPU 11. The virtual machine monitor 20 is software for constructing a plurality of virtual machines 30a to 30n on the host computer 2, and includes an address conversion management unit 21, an I / O management unit 22, a virtual machine interface information storage unit 23, which will be described later, A virtual machine I / O service management unit 24 is provided.

  A virtual machine 30a that is one of a plurality of virtual machines constructed in the virtual machine monitor 20 includes an application 31a, an OS 32a, a device driver 33a, and a virtual machine address conversion unit 34a, and the application 31a is controlled by the OS 32a. It is a virtual computer that executes

  When the application 31a uses the I / O card 40 connected to the bridge 13, it first requests the OS 32a. The OS 32a outputs a hardware resource request to the device driver 33a in response to a request from the application 31a. The device driver 33a outputs a hardware use request to the virtual machine monitor 20 in response to a request from the OS 32a. When the virtual machine monitor 20 obtains an operation result using the I / O card 40 in response to a request from the device driver 33a, the operation result is returned to the application 31a via the device driver 33a and the OS 32a.

  The virtual machine address conversion unit 34a is a correspondence table that associates physical addresses used in the virtual machine 30a with physical addresses used in the host computer 2. The virtual machine address conversion unit 34a is rewritten by the virtual machine monitor 20, and can only be read from the virtual machine 30a.

  The configurations and functions of the other virtual machines 30b to 30n constructed in the virtual machine monitor 20 are also the same as the configuration of the virtual machine 30a. Hereinafter, for example, the virtual machine 30b includes the application 31b, the OS 32b, the device driver 33b, the virtual machine address conversion unit 34b, and so on, and the like, and the like.

  In the virtual machine monitor 20, the address translation management unit 21 obtains information on the virtual machine address translation units 34 a to 34 n held in the virtual machines 30 a to 30 n based on the information held by the I / O management unit 22. rewrite. In response to an instruction from the address translation management unit 21, the I / O management unit 22 sends an I / O to the physical address space of the host computer 2 from the virtual machine interface information storage unit 23 and the virtual machine I / O service management unit 24. Information on how to map the virtual machine interfaces 42a to 42n of the O card 40 is read.

  The address translation management unit 21 is activated when any one of the virtual machines 30a to 30n is started, when the I / O card 40 is connected to the bridge 13, or when the virtual machine interface information storage unit 23 and the virtual machine I / O service It operates when the information held in at least one of the management units 24 is changed, and rewrites the virtual machine address conversion units 34a to 34n corresponding to the virtual machine to be activated. The means and method for changing the information held in the virtual machine interface information storage unit 23 and the virtual machine I / O service management unit 24 are arbitrary.

  The virtual machine interface information storage unit 23 holds information regarding the correspondence between the functions and areas of the virtual machine interfaces 42 a to 42 n of the I / O card 40. The virtual machine I / O service management unit 24 holds setting information indicating which part of the function of the I / O card 40 can be used for the virtual machines 30b to 30n. It is assumed that information stored in the virtual machine interface information storage unit 23 and the virtual machine I / O service management unit 24 is set in advance.

  Hereinafter, based on an example in which two virtual machines 30a and 30b are operating under the control of the virtual machine monitor 20, the contents of data stored in each operation unit and the host computer 2 The contents of the operation will be described. In this example, the host computer 2 includes only one bridge 13, and only one I / O card 40 is connected to the bridge 13. The functions of the I / O card 40 are the basic function and the extended function. It shall be divided into categories.

  FIG. 2 is a conceptual diagram showing the configuration of the virtual machine interfaces 42a and 42b included in the I / O card 40 shown in FIG. The virtual machine interfaces 42a and 42b correspond to the virtual machines 30a and 30b, respectively, and have a size corresponding to 3 pages of the memory page system of the RAM 12. Hereinafter, pages of the virtual machine interface 42a are expressed as pages 101a1 to a3, and pages of the virtual machine interface 42b are expressed as pages 101b1 to b3.

  FIG. 3 is a conceptual diagram showing an example of the content of information held by the virtual machine interface information storage unit 23 shown in FIG. The virtual machine interface information storage unit 23 includes data such as a device name 111 representing a target device, a page 112 representing the number of pages on the memory page system of the RAM 12, and a function 113 represented by each page.

  Here, the device name 111 is the I / O card 40, the function 113 represents the “basic function” on the first and second pages of the page 112, and the function 113 represents the “extended function” on the third page of the page 112. This means that in the virtual machine interfaces 42a and 42b shown in FIG. 2, the first and second pages realize basic functions, and the third page realizes extended functions.

  FIG. 4 is a conceptual diagram showing an example of the content of information held by the virtual machine I / O service management unit 24 shown in FIG. The virtual machine I / O service management unit 24 includes a virtual machine name 121 and an I / O card name 122 representing a target virtual machine and an I / O card, a function classification 123 representing a basic function and an extended function, It includes data such as access rights 124 for each function.

  Here, the virtual machine 30a is permitted to use only the basic functions of the I / O card 40 and is not permitted to use the extended functions. The virtual machine 30b is permitted to use both basic functions and extended functions of the I / O card 40. Data indicating the above is stored in the virtual machine I / O service management unit 24.

  The I / O management unit 22 includes information on the I / O card 40 held in the virtual machine interface information storage unit 23 and access right information for each virtual machine held in the virtual machine I / O service management unit 24. Originally, the physical memory address space on the RAM 12 and the virtual machine interfaces 42a and 42b are mapped.

  FIG. 5 is a conceptual diagram showing how the virtual machine interfaces 42a and 42b are mapped in the address space 200 on the RAM 12 shown in FIG. Address space 200 is reserved on RAM 12 for virtual machine interfaces 42a and 42b.

  As described above, the virtual machine 30a is stored in the virtual machine I / O service management unit 24 with information that only the basic functions of the I / O card 40 are permitted and the use of the extended functions is not permitted. ing. Therefore, the I / O management unit 22 refers to the virtual machine interface information storage unit 23, and the virtual machine interface 42a obtains information that the pages 101a1 to a2 correspond to basic functions and the page 101a3 corresponds to an extended function. . Based on this, the address conversion management unit 21 maps only the pages 101 a 1 to a 2 corresponding to the basic function in the address space 200. The page 101a3 corresponding to the extended function is not mapped. Since the virtual machine interface 42b is permitted to use both basic functions and extended functions corresponding to the pages 101b1 to b3, all the pages 101b1 to b3 are mapped in the address space 200.

  In the example shown in FIG. 5, in the address space 200, the virtual machine interface 42a page 101a1 is mapped to the physical address 0x10000, and the virtual machine interface 42a page 101a2 is mapped to the physical address 0x11000. Further, the page 101b1 of the virtual machine interface 42b is mapped to the physical address 0x25000, the page 101b2 of the virtual machine interface 42b is mapped to the physical address 0x26000, and the page 101b3 of the virtual machine interface 42b is mapped to the physical address 0x27000. Based on the mapping on the address space 200, the virtual machines 30a and 30b can exchange data with the virtual machine interfaces 42a and 42b, respectively.

  FIG. 6 is a conceptual diagram showing an example of the contents of the virtual machine address translators 34a and 34b created by the address translation manager 21 shown in FIG. FIG. 7 is a flowchart showing an operation in which the address translation management unit 21 shown in FIG. 1 creates the virtual machine address translation units 34a and 34b shown in FIG.

  The address translation management unit 21 is used when the virtual machine 30a or 30b starts operating, when the I / O card 40 is connected to the bridge 13, or the virtual machine interface information storage unit 23 and the virtual machine I / O service management unit 24. The operation starts when the information held in the virtual machine interface information is changed, and the information about the I / O card 40 held in the virtual machine interface information storage unit 23 and the virtual machine I / O service management unit 24 are held. The access right information for each virtual machine is read via the I / O management unit 22 (steps S301 to S301). Information about each page mapped in the address space 200 is also read (step S303).

  Based on the information read above, the address translation management unit 21 includes the virtual machine name 121, the I / O card name 122, and the function classification 123 of the virtual machine activated by the virtual machine I / O service management unit 24. In any case, the corresponding access right 124 is determined (steps S304 to S305). If the access right 124 is “permitted”, the corresponding information is written in the virtual machine address conversion unit 34a or 34b of the corresponding virtual machine name 121 (step S306). If the access right 124 is “non-permitted”, it is not written.

  The address translation management unit 21 determines whether or not the processing in steps S305 to S306 has been performed for all of the corresponding virtual machine name 121, I / O card name 122, and function classification 123 (step S307), and has been completed. If not, the process moves to another virtual machine name 121, I / O card name 122, and function category 123, and the processing from step S305 is repeated (step S308). If it is determined in step S307 that the operation has been completed, the address translation management unit 21 starts the operation of the corresponding virtual machine (step S309) and ends its own operation.

  The virtual machine address conversion unit 34a or 34b of each virtual machine shown in FIG. 6 includes the address 131 in the corresponding address space 200 and the virtual machine 30a or 30b for each I / O card name 122 and function division 123. The physical address 132 of the address space 210 is written. At that time, the information is written only for the function category 123 whose access right 124 is “permitted”, and is not written if the access right 124 is “not permitted”.

  FIG. 6A illustrates the virtual machine address conversion unit 34a of the virtual machine 30a. When the application 31a wants to access the basic function of the I / O card 40, when accessing the physical address 0x00000 in the address space 210 of the virtual machine 30a, the device driver 33a refers to the virtual machine address conversion unit 34a, and the address space of the RAM 12 200 addresses 0x10000 can be accessed. However, since the entry corresponding to the extended function of the I / O card 40 does not exist in the virtual machine address conversion unit 34a, the extended function of the I / O card 40 does not exist in the first place for the virtual machine 30a. Of course you cannot access it.

  FIG. 6B illustrates the virtual machine address conversion unit 34b of the virtual machine 30b. When the application 31a wants to access the basic function of the I / O card 40, when accessing the physical address 0x00000 in the address space 210 of the virtual machine 30b, the device driver 33b refers to the virtual machine address conversion unit 34b and refers to the address space of the RAM 12 200 address 0x25000 is accessed. Similarly, when the application 31a wants to access the extended function of the I / O card 40, when accessing the physical address 0x02000 of the address space 210 of the virtual machine 30b, the device driver 33b refers to the virtual machine address conversion unit 34b and refers to the RAM 12 The address 0x27000 of the address space 200 is accessed. Thus, the virtual machine 30b can access both the basic function and the extended function of the I / O card 40.

  As a result, access from both the virtual machines 30a and 30b is permitted to the basic function on the I / O card 40, and access from the virtual machine 30b is permitted to the extended function, and access from the virtual machine 30a is permitted. The operation of blocking is now possible.

  The operation shown in FIG. 7 is performed when the virtual machine 30a or 30b starts operating, when the I / O card 40 is connected to the bridge 13, or the virtual machine interface information storage unit 23 and the virtual machine I / O service management unit. It is performed only when the information held in at least one of 24 is changed, and does not reside in the CPU 11 during normal operation. Therefore, it is not necessary for the CPU 11 to determine the access authority every time there is a request to use the I / O card 40 from each virtual machine, so that the load on the CPU 11 during normal operation is not increased.

  In the present embodiment, as described above, by providing the virtual machine address conversion units 34a and 34b, different service levels are provided for each of a plurality of virtual machines without increasing the load on the CPU 11 during normal operation. Can be provided. This operation can be performed with slight modifications to each software, and does not require hardware changes.

  The operations described above are for three or more virtual machines, when a plurality of I / O cards 40 are connected to the bridge 13, and when the functions of the I / O card 40 are divided into three or more categories. Can be easily extended. Of course, it does not matter what the function of the I / O card 40 is actually.

[Second Embodiment]
FIG. 8 is a block diagram showing the configuration of the virtual machine system 1b according to the second embodiment of the present invention. The virtual machine system 1b is configured by connecting an I / O card 40b to a host computer 2b. In the virtual machine monitor 20b included in the host computer 2b, the virtual machine interface information storage unit 23 is omitted compared to the virtual machine monitor 20 included in the host computer 2 according to the first embodiment. Instead, the virtual machine interface information storage unit 43 is added to the I / O card 40b as compared with the I / O card 40 according to the first embodiment. Other than this, the configuration of the virtual machine system 1b is the same as that of the virtual machine system 1 according to the first embodiment, and thus further description thereof is omitted.

  Similar to the virtual machine interface information storage unit 23 according to the first embodiment, the virtual machine interface information storage unit 43 holds information regarding the correspondence between the functions and areas of the virtual machine interfaces 42a to 42n. The information stored in the virtual machine interface information storage unit 43 can be referred to from the I / O management unit 22 of the virtual machine monitor 20b.

  FIG. 9 is a conceptual diagram showing an example of the content of information held by the virtual machine interface information storage unit 43 shown in FIG. The virtual machine interface information storage unit 43 holds information only for each I / O card 40. Therefore, the device name 111 is omitted as compared with the virtual machine interface information storage unit 23 according to the first embodiment, and data such as the page 112 and the function 113 is included.

  Even in this case, the virtual machine system 1b according to the second embodiment can perform the same operation as the virtual machine system 1 according to the first embodiment, and can obtain the same effect. . Therefore, the description about the structure and operation | movement beyond this is abbreviate | omitted.

[Other embodiments]
In addition to the first and second embodiments described above, the following modifications are possible. For example, instead of connecting the CPU to the I / O card via a bridge, the CPU and the I / O card may be directly connected. Further, instead of the I / O packet transfer unit that connects the I / O card to the host computer, it may be connected using a bus interface.

  Further, instead of the application on the virtual machine making an access request via the OS and the device driver, both or one of the OS and the device driver is omitted, and the application requests the virtual machine more directly. It is also possible to perform. Of course, the above-described embodiment and its modifications can be implemented in combination with each other.

  Although the present invention has been described with the specific embodiments shown in the drawings, the present invention is not limited to the embodiments shown in the drawings, and is known so far as long as the effects of the present invention are achieved. It goes without saying that any configuration can be adopted.

  It can be used in a computer that operates by constructing a plurality of virtual machines.

Virtual machine system according to first embodiment of the present invention FIG. 2 is a conceptual diagram illustrating a configuration of a virtual machine interface included in the I / O card illustrated in FIG. 1. FIG. 2 is a conceptual diagram illustrating an example of content of information held by a virtual machine interface information storage unit illustrated in FIG. 1. FIG. 2 is a conceptual diagram illustrating an example of content of information held by a virtual machine I / O service management unit illustrated in FIG. 1. It is a conceptual diagram which shows the mode of the mapping of the virtual machine interface in the address space on RAM shown in FIG. It is a conceptual diagram which shows an example of the content of the virtual machine address conversion part produced by the address conversion management part shown in FIG. 7 is a flowchart illustrating an operation of creating the virtual machine address conversion unit illustrated in FIG. 6 by the address conversion management unit illustrated in FIG. 1. It is a block diagram which shows the structure of the virtual machine system which concerns on the 2nd Embodiment of this invention. It is a conceptual diagram which shows an example of the content of the information which the virtual machine interface information storage part shown in FIG. 8 hold | maintains.

Explanation of symbols

1, 1b Virtual machine system 2, 2b Host computer 11 CPU
12 RAM
13 Bridge 20, 20b Virtual machine monitor 21 Address conversion management unit 22 I / O management unit 23, 43 Virtual machine interface information storage unit 24 Virtual machine I / O service management unit 30a-n Virtual machine 31a-n Application 32a-n OS
33a-n Device driver 34a-n Virtual machine address conversion unit 40a-n I / O card 41 I / O packet transfer unit 42a-n Virtual machine interface

Claims (19)

A virtual machine system comprising a host computer on which a plurality of virtual machines operate, and an I / O card connected to the host computer and providing a plurality of functions to the host computer,
The I / O card has a plurality of virtual machine interfaces corresponding to the plurality of virtual machines, each having a plurality of pages corresponding to each of the plurality of functions;
Each of the virtual machines has an address conversion unit that converts a physical address on the virtual machine and a physical address of the virtual machine interface and the page on the host computer. The host computer is
A virtual machine I / O service management unit that holds information about availability of each of the functions for each of the plurality of virtual machines;
Address conversion for writing the physical address of the virtual machine interface for the function held by the virtual machine I / O service management unit to the address conversion unit of each of the plurality of virtual machines. The virtual machine system according to claim 1, further comprising a management unit.   The host computer or the I / O card includes a virtual machine interface information storage unit that holds information regarding which of the plurality of functions corresponds to each of the plurality of pages. Item 3. The virtual machine system according to Item 2.   The address translation management unit is configured such that when the virtual machine is activated, the I / O card is connected to the host computer, or the virtual machine interface information storage unit and the virtual machine I / O service management unit. The virtual address according to claim 3, wherein the physical address of the virtual machine interface is written in the address translation unit when the information held in at least one of them is changed. Machine system.   The virtual machine system according to claim 2, wherein the plurality of pages are assigned the function in units of a page size or a multiple of the page size in the memory system of the host computer.   The virtual machine system according to claim 2, wherein the I / O card includes an I / O packet transfer unit that delivers an access request from the host computer to an appropriate virtual machine interface. Host computer capable of connecting an I / O card having a plurality of virtual machine interfaces on which a plurality of virtual machines operate, corresponding to the plurality of virtual machines, each having a plurality of pages corresponding to each of the plurality of functions Because
Each of the virtual machines includes an address conversion unit that converts a physical address on the virtual machine and a physical address of the virtual machine interface and the page on the host computer. A virtual machine I / O service management unit that holds information about availability of each of the functions for each of the plurality of virtual machines;
Address conversion for writing the physical address of the virtual machine interface for the function held by the virtual machine I / O service management unit to the address conversion unit of each of the plurality of virtual machines. The host computer according to claim 7, further comprising a management unit.   The host computer according to claim 8, further comprising a virtual machine interface information storage unit that holds information regarding which of the plurality of functions corresponds to each of the plurality of pages.   The address translation management unit is at least one of the virtual machine interface information storage unit and the virtual machine I / O service management unit when the virtual machine is started, the I / O card is connected, or the virtual machine interface information storage unit and the virtual machine I / O service management unit. 10. The host computer according to claim 9, wherein the physical address of the virtual machine interface is written in the address conversion unit when the information held in the information corresponds to any of when the information is changed. An I / O card that is connected to a host computer on which a plurality of virtual machines operate and provides a plurality of functions to the host computer,
An I / O card comprising a plurality of virtual machine interfaces corresponding to the plurality of virtual machines, each having a plurality of pages corresponding to each of the plurality of functions.   The I / O card according to claim 11, further comprising a virtual machine interface information storage unit that stores information regarding which of the plurality of functions corresponds to each of the plurality of pages.   13. The I / O card according to claim 12, wherein the plurality of pages are assigned the function in units of page size or multiples thereof in the memory system of the host computer.   The I / O card according to claim 12, further comprising an I / O packet transfer unit that delivers an access request from the host computer to an appropriate virtual machine interface. Method of constructing a plurality of virtual machines by a host computer to which an I / O card having a plurality of virtual machine interfaces corresponding to a plurality of virtual machines and having a plurality of pages each corresponding to each of a plurality of functions is connected Because
An address conversion unit providing step for providing the virtual machine with an address conversion unit for converting a physical address on the virtual machine and a physical address of the virtual machine interface and the page on the host computer;
Each virtual machine includes an access step of accessing the page by using the address conversion unit. The address conversion unit providing step includes:
An availability reading step of reading information on availability of each of the functions for each of the plurality of virtual machines included in the host computer;
An address conversion unit writing step of writing a physical address of the virtual machine interface to the address conversion unit of each of the plurality of virtual machines for the function for which the information indicating that it can be used is read in the availability reading step. The virtual machine construction method according to claim 15, further comprising: The address conversion unit providing step includes:
The page information reading step of reading information on which of the plurality of functions each of the plurality of pages included in the host computer or the I / O card corresponds to. The described virtual machine construction method.   When the virtual machine is started up, when the I / O card is connected to the host computer, or information regarding availability of each of the functions for each of the plurality of virtual machines and each of the plurality of pages The address conversion unit providing step is performed when at least one of information on which one of the plurality of functions corresponds is changed. 18. The virtual machine construction method according to 17. To a host computer to which an I / O card having a plurality of virtual machine interfaces corresponding to a plurality of virtual machines and having a plurality of pages each corresponding to each of a plurality of functions is connected,
An availability read process for reading information on availability of each of the functions for each of the plurality of virtual machines included in the host computer;
Address conversion for converting the physical address on the virtual machine and the virtual machine interface and the physical address of the page on the host computer for the function for which the information indicating that it can be used is read in the availability reading step. A virtual machine construction program that causes an address conversion unit writing process to write a physical address of the virtual machine interface to the unit.

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