The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 01, 2015
Filed:
Jan. 31, 2013
Parallels Ip Holdings Gmbh, Schaffhausen, CH;
Denis Lunev, Moscow, RU;
Parallels IP Holdings GmbH, Schaffhausen, CH;
Abstract
Method for avoiding Guest I/O timeout, including generating a request to an I/O device in a Guest Operating System (GOS) running inside a VM; setting a VM timeout deadline; in a hypervisor, setting a supervisory timeout deadline for the I/O device to respond that is shorter than the VM timeout deadline; if no response is received before expiration of the supervisory timeout deadline, pausing the GOS; freezing system time of the GOS; activating a handler for the I/O device response in the hypervisor; upon receipt of the response prior to the supervisory timeout deadline, forwarding the response to the GOS, unpausing the GOS, unfreezing the system time of the GOS; upon receipt of the response after the supervisory timeout deadline, and after the GOS is unpaused by the hypervisor, the Guest OS receives the response from the hardware device; and if no response is received, the GOS is kept paused.