JPH0212340A - Virtual computer - Google Patents

Abstract

PURPOSE:To avoid the useless processing of a guest operating system before a fault occurs by using a means which can execute continuously the guest operating system in a state set before the breakdown of a host operating system in the case this host operating system has the breakdown. CONSTITUTION:In the case a host operating system 1 has a fault and then the breakdown, the vertual computer executing environment secured before the breakdown of the system 1 is obtained again via a VM control information restoring means 8, a VM environment reforming means 9 and a VM guest operating system area restoring means 10. Then the control is shifted to the interrupting point of a guest operating system 6 from a VM monitor 2 for succession of the processing. In this case, the system 6 executes again the input/ output operations executed before an interruption and replaces the real time. Thus the useless processing of the system 6 can be avoided before the fault occurs.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a failure handling method for virtual machines.

〔overview〕

The present invention provides a means for continuing to execute the guest operating system in the state before the failure occurs when the host operating system goes down, in the failure handling means of the virtual machine. This is to avoid wasting the information.

[Conventional technology]

Conventionally, when a failure occurs in the host operating system while the guest operating system is running on a virtual machine and the system goes down, the host operating system only performs its own termination processing to complete the failure process. .

[Problem that the invention seeks to solve]

With such virtual machine failure handling means, when a failure occurs in the host operating system, the guest operating system controlled by the VM monitor on the host operating system is terminated without any notification. As a result, for the guest operating system, a shutdown of the host operating system was equivalent to a power down or forced initialization, and the drawback was that it was impossible to close the journal or restart after restarting.

The present invention aims to eliminate such drawbacks, and aims to provide a virtual machine that can restart the processing of a guest operating system in the state at the time of failure.

[Means for solving problems]

The present invention provides a virtual machine that includes a first system that is a guest operating system and a second system that is a host operating system that has a virtual memory monitor that controls the first system. a first saving means for saving virtual memory control information from the main memory when the second system is terminated; and a second saving means for saving the area of the first system controlled by the virtual memory monitor from the main memory; a second restoring means for restoring the virtual memory control information that has been saved into the main memory after startup of the second system; Reconstruction means for causing the virtual memory monitor to reallocate the allocated resources; and second restoration means for restoring the area of the first system being evacuated to the memory area reallocated by the reconstruction means. It is characterized by having

[For use]

If the VM monitor is being executed when the host operating system is terminated, the VM control information on the main memory is saved to the external storage device. Furthermore, the area of the guest operating system whose execution is controlled by the VM monitor is saved onto the external storage device. VM evacuated to auxiliary storage after starting the host operating system
Restore control information to main memory. Based on the restored VM control information, the VM is
The monitor reallocates the resources allocated by the host operating system and rebuilds the VMLt boundary. Restore the guest operating system area that was saved to the reallocated guest operating system memory area.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In this embodiment, as shown in FIG. 1, if the VM monitor 2 is running during termination processing of the host operating system l, the VM control information 3 on the main memory is transferred to the external storage device 4.
A VM control information saving means 5 saves the VM control information 3 to be saved upward onto the external storage device 4, and a VM saves the area of the guest operating system 6 whose execution is controlled by the VM monitor 2 onto the external storage device 4. - GO3 area saving means 7 and VM control information restoring means 8 for restoring the VM control information 3 saved on the external storage device 4 by the VM control information saving means 5 to the main memory after the host operating system 1 is started up; Then, based on the VM control information 3 restored by the VM control information restoration means 8, the VM monitor 2 reallocates the resources allocated by the host operating system 1 before the termination of the host operating system 1, and restores the VM environment. The VM environment reconstruction means 9 performs the reconstruction, and the VM-G is stored in the memory area for the guest operating system 6 reallocated by the VM environment reconstruction means 9.
VM-GO3 area restoring means 10 restores the area of the guest operating system 6 that has been saved by the O3 area saving means 7. That is, this embodiment provides a virtual machine that includes a first system that is a guest operating system 4 and a second system that is a host operating system 1 that has a virtual memory monitor 2 that controls this first system. a VM control information saving means 5 which is a first saving means for saving virtual memory control information from the main memory when the second system is terminated while the monitor 2 is running; VM-GO3 area saving means 7 which is a second saving means for saving the area of the first system from the main memory, and a first restoration for restoring the virtual memory control information being saved to the main memory after starting up the second system. V is a means
M control information restoring means 8, and rebuilding means for causing the virtual memory monitor 2 to reallocate resources allocated from the second system before termination of the second system based on the restored virtual memory control information. It is equipped with a certain VM environment reconstruction means 9 and a VM-GO3 area restoration means 10 which is a second restoration means for restoring the area of the first system which is being evacuated to the memory area reallocated by this reconstruction means. It is characterized by

Next, the operation of this embodiment will be explained with reference to the drawings.

The vMM control information saving means 5 saves the VM control information 3 in the host operating system 1 onto the external storage device 4 when the VM monitor 2 is being executed in the host operating system 1 (steps Sl, S2 and 33). The VM control information 3 saved at this time includes:
As shown in FIG. 2, there is peripheral device allocation information, main memory allocation information, virtual machine restart information, virtual machine status information, etc. for each guest operating system. The VM-GO3 area saving means 7 obtains main memory area information allocated to the guest operating system 6 from the main memory allocation information of each guest operating system 6 in the VM control information 3,
Save the corresponding area to the external storage device 4 (step 3
3). The VM control information restoration means 8 is called after the host operating system 2 is restarted and the VM monitor 2 is started, and the VM control information restoration means 8 restores the VM saved on the external storage device 4.
Restore control information 3 onto main memory (steps S4, S5
). The VM environment reconstruction tool 9 is a VM control information restoration means 8
Using the VM control information 3 restored in step 86, the peripheral devices and main memory that were allocated to each guest operating system 6 before the host operating system 1 went down are reallocated (step 86). The VM-GO3 area restoration means 10 restores the area of the guest operating system 6 that was saved on the external storage device 4 to the main storage area reallocated by the VMI environment reconstruction means 9 (
Step 57)a In this way, the VM control information restorer &8, the VM environment rebuilder 9, and the VM-GO3 area restorer 10 complete the rebuilding of the virtual machine execution environment before the host operating system 1 went down.

After this, control is passed from the VM monitor 2 to the interruption point of the guest operating system 6 to continue processing. At this time, the guest operating system 6 re-executes the input/output that was being executed before the interruption and performs real-time update processing.

〔Effect of the invention〕

As explained above, in the present invention, even if the host operating system in a virtual computer system fails and goes down, the guest operating system can continue to run in the state before it went down, so the guest operating system and VM monitor This has the effect of avoiding wasting the processing of the guest operating system up to the point of failure due to a failure of the host operating system even though there is no abnormality in the host operating system.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a diagram showing the contents of VM control information. FIG. 3 is a flow diagram showing the operation of the embodiment of the present invention. l...Host operating system (HO3),
2... VM monitor, 3... VM control information, 4...
External storage device, 5... VM control information saving means, 6...
・Guest hosting system (GO3)?・
... VM/GO3 area saving means, 8... VM control information restoration means, 9-VMBI environment reconstruction means, 10-VM-G
O3 area restoration means.

Claims (1)

[Claims] 1. A virtual computer comprising a first system (4) which is a guest operating system and a second system (1) which is a host operating system having a virtual memory monitor (2) that controls this first system. In the computer, a first saving means (5) for saving virtual memory control information from main memory when the second system terminates while the virtual memory monitor is running; and a first saving means (5) for saving virtual memory control information from main memory; a second saving means (7) for saving an area of one system from the main memory; a first restoring means (8) for restoring the saved virtual memory control information to the main memory after the second system is started; Reconstruction means (9) for causing the virtual memory monitor to reallocate resources allocated from the second system before termination of the second system based on the restored virtual memory control information; a second restoring means (1) for restoring the area of the first system being saved to the reallocated memory area;
0) A virtual computer characterized by comprising: