JPS6347844A - Information processor - Google Patents

Abstract

PURPOSE:To shorten an accessing time, by bypassing a virtual main memory conversion part when a virtual computer accesses to the specific area of a main memory in a real computer. CONSTITUTION:When the value of a flip-flop 4 is '0', in other words, when an address is the one where no accessing to a hardware area is performed, a selector 5 selects the output of an adder 2. Meanwhile, at the time of accessing to the hardware area, the selector 5 selects the value of a main memory address register 1 by setting the value of the flip-flop at '1'. Thereby, the address used in the accessing to a main memory device on the real computer goes to a value itself set at the main address register 1, regardless the value of a virtual main memory base register 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information processing device, and particularly to a technique for generating addresses of a main storage device when realizing a virtual computer.

[Conventional technology]

Generally, when realizing a virtual computer, a part of the main storage of a real computer is allocated as the main storage of the virtual computer. FIG. 2 shows an example of the memory map. In Figure 2, the memory address of the real computer is 0 to 1677721.
There are up to number 5, but some of them are 12582912~
The main memory of the virtual machine is allocated to address 16777215. Then, on the virtual machine, addresses from 0 to 4194303 are assigned to the main memory in the above range. Therefore, since there is a certain difference between the main memory address of the virtual machine and the corresponding main memory address of the real computer, by adding a certain value to the main memory address of the virtual machine, the main memory address of the real computer is It is necessary to perform a conversion to a storage address.

Conventional information processing devices are configured so that there is no need to be aware of whether processing executed on a virtual computer is a virtual computer or not by providing a virtual main memory space conversion means that automatically performs this addition. Ta. This is the virtual main memory space conversion unit 34 shown in FIG. When converting the main memory address of the virtual computer to the main memory address of the real computer, an added value is set in the virtual main memory pace register 33, and the main memory address on the virtual computer set in the main memory address register 31 and this added value are The adder 32 automatically adds the numbers, so that there is no need for the virtual computer to be aware of this addition.

[Problem that the invention seeks to solve]

As described above, in the conventional information processing device, the virtual main memory space conversion unit adds the value of the virtual main memory pace register 33 to the main memory address of the virtual machine for every access to the main memory from the virtual machine. Therefore, when accessing the hardware area shown in the memory map in Figure 2 that stores information about input/output devices on the real computer from within the virtual computer, be aware that the above-mentioned additions and arithmetic operations will be performed. Either correct it in advance so that it will be the correct value after the addition, or change the value of the virtual main memory pace register to 0 when accessing the hardware area, and then change it to the correct value again after the access is completed. Since it is necessary to reconfigure the settings, there is a drawback that the processing speed decreases when accessing the hardware area.

[Means for solving problems]

An information processing device of the present invention includes, in an information processing device in which a virtual computer is running, a storage unit that holds a start address of a main storage space of a main storage device of a real computer allocated to the running virtual computer; addition means for adding the output of the storage means and an address used for accessing the main storage device performed on the virtual computer; and the virtual computer accesses a specific area of the main storage device of the real computer. a display means for displaying the information, and a selection means for selecting either the output of the addition means or the address used for accessing the main storage device on the virtual computer system based on the output of the display means. It consists of:

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing the main parts of an embodiment of the present invention. The virtual main memory space conversion unit 10 includes an adder 2, a virtual main memory pace register 3. and a selector 5.

Adder 2 adds the output of main memory address register 1 and the output of virtual main memory pace register 3, and the output serves as one input of selector 5. The output of the main memory address register 1 is directly connected to the other input of the selector 5.

When the value of flip-flop 4, which indicates that the address that accesses the hardware area of the main memory of the real computer is set in main memory address register 1, is "0", that is, when the address does not access the hardware area, the selector 5 selects the output of adder 2. For example, the value of main memory address register 1 is 4,096 and the value of virtual main memory pace register 3 is 12,582,912 (12X
2”=12M), the address used to access the main memory on the actual computer is 12.587.008.
becomes. On the other hand, when accessing the hardware area, the selector 5 selects the value of the main memory address register 1 by setting the value of the flip-flop to "1". Therefore, regardless of the value of virtual main memory pace register 3, the address always used to access the main memory on the real computer is 4,096 in the above example, which is the same value set in main memory address register 1. becomes the address directly on the real computer.

〔Effect of the invention〕

As explained above, the present invention has the effect that when a virtual machine accesses a specific area of the main memory of a real computer, the access time can be shortened compared to the conventional art by bypassing the virtual main memory converter.

[Brief explanation of drawings]

Figure 1 is a block diagram showing an embodiment of the present invention, Figure 2 is a memory map diagram showing the correspondence between main memory addresses in a virtual machine and main memory addresses in a real computer, and Figure 3 is a block diagram of a conventional example. be. 1.31...Main memory address register, 2.32...
- Adder, 3, 33... Virtual main memory base register, 4... Flip-flop, 5... Selector, 10
゜34...Virtual main memory space conversion unit. Agent Patent Attorney Susumu Uchihara Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] In an information processing device on which a virtual computer is running, a storage means for holding the start address of a main memory space of a main storage device of a real computer allocated to the running virtual machine, and an output of the storage means and the virtual an addition means for adding an address used for access to the main storage device performed on a computer; a display means for displaying that the virtual computer is accessing a specific area of the main storage device of the real computer; The present invention is characterized by comprising a selection means for selecting either the output of the addition means or an address used for accessing the main storage device performed on the virtual computer system based on the output of the display means. Information processing device.