Title:
仮想計算機の制御プログラムおよび仮想計算機システム
Document Type and Number:
Japanese Patent JP4897578
Kind Code:
B2
Abstract:
The program attains compatibility of suppression of an overhead accompanying page exception handling in the case of operating a program whose amount of memory use is large on a virtual machine and suppression of the overhead accompanying page exception handling in the case of operating a first OS that has a function of making another OS run on a virtual machine. A VMM creates a shadow PT (Page Table) for prohibiting reading-writing of privileged memory that requires emulation of reading/writing by using a RSV-bit, and registers the shadow PT and the second PT that a second OS operating on the first OS has in an x86 compatible CPU equipped with page exception detecting function using two PT's. When a page exception occurs, the VMM refers to cause code of the page exception and, when a P field of the cause code is 0, determines immediately that emulation is unnecessary.
Inventors:
Naoya Hattori
Moriki Toshiomi
Yuji Sakuma
Moriki Toshiomi
Yuji Sakuma
Application Number:
JP2007150973A
Publication Date:
March 14, 2012
Filing Date:
June 06, 2007
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
G06F9/46
Domestic Patent References:
| JP2006350531A | ||||
| JP2005135396A |
Foreign References:
| WO2006081582A1 |
Attorney, Agent or Firm:
Yamato Tsutsui