JPH01140342A - Virtual computer system - Google Patents

Abstract

PURPOSE:To improve degree of freedom in the allocation of a real memory by making access to the configuration unit of a main memory device corresponding to a configuration unit number allocated to its own computer by a virtual computer and saving the change of allocation only by changing the allocation of the configuration unit of a virtual/real conversion table. CONSTITUTION:To the virtual/real conversion table 40, the configuration unit number which represents the configuration unit of the main memory device to which each virtual computer can make access is allocated. Therefore, each virtual computer can make access to the configuration unit of the main memory device 10 corresponding to its own computer, and it is enough to change the allocation of the configuration unit number of the virtual/real conversion table 40 in case of changing the allocation. In such a way, since it is no necessary to re-arrange the allocation for the whole in case of changing a part of the allocation of the real memory, the degree of freedom can be heightened.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention has a plurality of virtual machines each given an identification number of 61, and each virtual machine accesses its own dedicated memory area. Regarding the Saniso system.

[Conventional technology]

Conventionally, this type of virtual computer system converts a fixed value predetermined for each virtual address on the virtual IFN5m in the process of converting the virtual address held by the virtual corrector into a real address on real memory. The method is to add it to the generated virtual address.

[Problem that the invention seeks to solve]

In the conventional virtual computer system described above, each virtual fl C
The essence of this is that the memory area exclusive to one machine is always allocated to a contiguous real memory area, and even if only a portion of the real memory allocation to the virtual X + sieve machine is changed, the entire allocation must be redone. The disadvantage is that there is no degree of freedom at all.

[Means for solving problems]

The virtual computer system of the present invention has a plurality of memory areas divided into constituent units, and each memory area is assigned a constituent unit number, and a virtual computer system running on a real machine. A first register that holds a computer identification number, a second register that holds a virtual address that the running virtual machine attempts to access, and one of the data in the first register and the data in the second register. Enter the part and
A virtual/actual conversion table having constituent unit number holding areas each searched by an entry number consisting of input data, and storing constituent unit numbers of the main storage device in each constituent unit number holding area of the virtual/actual conversion table; and a control means that allows the virtual machine to access the constituent unit of the main storage device allocated to the virtual machine based on the stored constituent unit number.

[Effect]

By assigning a configuration unit number indicating the middle configuration of the main storage device that each virtual machine can access to the virtual/real conversion table, each virtual machine can use the main memory corresponding to the configuration unit number assigned to itself. The middle part of the configuration of the device can be accessed, and even if the allocation is to be changed, it is only necessary to change the allocation of the middle part of the virtual/real conversion table No. 7R.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the virtual machine 9111 system of the present invention.

The memory 10 has a capacity of 12 configuration units, ie, /I 8MB, where each configuration unit is 4MB, and each configuration unit is numbered 0.1.2. ~． 11 is the main memory allocated to it, each constituent unit is selected according to the settings of the table 40, and a specific address within the selected constituent unit is stored in bits A2 . A3. ~． Specified by A23. The register 20 consists of 2 bits, bits 10 and 11, and is a virtual calculation III identification number 0 to 3 that is being executed on the real computer.
Instruct one of the following. The register 30 is AO, A1, ~
．． A running virtual IT consisting of 24 bits of A23
Holds the virtual address used when machine 0 accesses memory 10. Table 40 shows bit IO,1 of register 20.
This is a virtual-to-real conversion table that is indexed using addresses 1 and 4 bits AO and A1 of register 30, and has 16 entries. Entries 0 to 3 are virtual πl dedicated machine identification numbers 0, and entries 4 to 7 are Virtual 51 Korean aircraft identification number 1
, entries 8 to 11 correspond to the virtual Kl93 machine number 2, and entries 12 to 15 correspond to the virtual K1 machine number 3. Each entry 0.1. ~． 15 is an allocation bit (■) indicating whether the corresponding structural unit in the memory 4 is allocated or not, and when it is allocated (■ - "1"), the corresponding structural unit number 0゜1.2. ~． It holds 11.

Next, the operation of this embodiment will be explained.

Table 19 Table 2 shows the constituent unit number of memory 10 @0.1.2 for each virtual machine 1n machine with virtual machine number 0.1.2.3°.
．． ~． This shows how the 11 structural units are allocated.

In this embodiment, one virtual machine can have a memory capacity of up to 16 MB, and the memory capacity can be increased or decreased in units of 4 MB.

As shown in Table 1, the virtual address described in the explanation of virtual HtW machine identification number 0.1.2 and above is an address conversion type to a real address, and corresponds to a real address from the perspective of a virtual computer.

(Effects of the Invention) As explained above, the present invention assigns to the virtual/sudden change'@t-pull the 11th number in the configuration of the main storage device that each virtual tI computer can access. f3 can access the configuration unit of the main storage device corresponding to the configuration medium number assigned to itself, and even when changing the allocation number, the allocation of the configuration unit number of the virtual/real conversion table can be changed simultaneously. This has the effect of increasing the degree of freedom in allocating real memory.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of a virtual computer system of the present invention. 10...Memory, 20.30...Register, 40...Table.

Claims (1)

[Claims] A virtual computer system having a plurality of virtual machines each assigned an identification number and each virtual machine accessing its own memory area, which has a plurality of memory areas divided into constituent units. A main storage device to which each memory area is assigned a constituent unit number, a first register that holds the identification number of a virtual machine running on the real computer, and a register that holds the identification number of the virtual machine running on the real machine, and a register that the running virtual machine attempts to access. inputting a second register holding a virtual address to be stored, data in the first register, and part of the data in the second register;
A virtual/actual conversion table having constituent unit number holding areas each searched by an entry number consisting of input data, and storing constituent unit numbers of the main storage device in each constituent unit number holding area of the virtual/actual conversion table; 1. A virtual computer system comprising: a control unit that allows a virtual machine to access a configuration unit of a main storage device allocated to the virtual machine based on a stored configuration unit number.