Guest idle based VM request completion processing

Patent metadata

Field	Value
Publication number	US-9697029-B2
Application number	US-201414529015-A
Country	US
Kind code	B2
Filing date	Oct 30, 2014
Priority date	Oct 30, 2014
Publication date	Jul 4, 2017
Grant date	Jul 4, 2017

Abstract

A hypervisor identifies one or more interrupts of a networking device for a virtual machine. The hypervisor queues the interrupts and determines the execution state of at least one virtual processor of a virtual machine. Upon determining that the execution state of the virtual processor is active, the hypervisor continues queuing the interrupts of the networking device. Upon determining that the execution state of the virtual processor has changed to idle, the hypervisor provides the queued interrupts to the virtual machine.

First claim

What is claimed is:

1. A method comprising:
identifying, by a processing device executing a hypervisor, one or more interrupts of a networking device for a virtual machine;
queuing the one or more interrupts of the networking device;
determining, by the processing device executing the hypervisor, an execution state of at least one virtual processor of the virtual machine;
responsive to determining that the execution state is idle, providing, by the processing device executing the hypervisor, the one or more queued interrupts to the virtual machine; and
responsive to determining that the one or more queued interrupts have been queued for a period of time that meets a first threshold condition:
determining that the at least one virtual processor has transferred control of a physical processor to the hypervisor; and
providing, by the processing device executing the hypervisor, the one or more queued interrupts to the virtual machine.

2. The method of claim 1 wherein providing the queued interrupts comprises:
retrieving, by the hypervisor, the one or more queued interrupts from the networking device; and
sending, by the hypervisor, the one or more queued interrupts to the at least one virtual processor of the virtual machine.

3. The method of claim 1 further comprising providing, by the hypervisor, the one or more queued interrupts to the virtual machine upon determining that the one or more queued interrupts have been queued for a period of time that meets a second threshold condition.

4. The method of claim 1 , wherein the at least one virtual processor represents a plurality of virtual processors.

5. The method of claim 4 , further comprising:
receiving, by the hypervisor, information from the virtual machine that maps at least one of the plurality of virtual processors to the networking device;
storing, by the hypervisor, the mapping information in a data store accessible to the hypervisor; and
pairing, by the hypervisor, the one or more queued interrupts with the at least one of the plurality of virtual processors using the mapping information.

6. The method of claim 5 , further comprising:
upon determining that the execution state of at least one of the plurality of virtual processors is idle, identifying the networking device associated with the at least one virtual processor in view of the mapping information;
querying the networking device for one or more requests to be completed; and
processing, by the hypervisor, the one or more requests.

7. A computing apparatus comprising:
a memory; and
a processing device, operatively coupled to the memory, to execute a hypervisor to:
identify one or more interrupts of a networking device for a virtual machine;
queue the one or more interrupts of the networking device;
determine an execution state of at least one virtual processor of the virtual machine;
responsive to determining that the execution state is idle, provide the one or more queued interrupts to the virtual machine; and
responsive to determining that the one or more queued interrupts have been queued for a period of time that meets a first threshold condition:
determine that the at least one virtual processor has transferred control of a physical processor to the hypervisor; and
provide the one or more queued interrupts to the virtual machine.

8. The apparatus of claim 7 wherein to provide the queued interrupts, the processing device is to:
retrieve, by the hypervisor, the one or more queued interrupts from the networking device; and
send, by the hypervisor, the one or more queued interrupts to the at least one virtual processor of the virtual machine.

9. The apparatus of claim 7 , wherein the processing device is further to provide, by the hypervisor, the one or more queued interrupts to the virtual machine upon determining that the one or more queued interrupts have been queued for a period of time that meets a second threshold condition.

10. The apparatus of claim 7 , wherein the at least one virtual processor represents a plurality of virtual processors.

11. The apparatus of claim 10 , wherein the processing device is further to:
receive, by the hypervisor, information from the virtual machine that maps at least one of the plurality of virtual processors to the networking device;
store, by the hypervisor, the mapping information in a data store accessible to the hypervisor; and
pair, by the hypervisor, the one or more queued interrupts with the at least one of the plurality of virtual processors using the mapping information.

12. The apparatus of claim 11 , wherein the processing device is further to:
upon determining that the execution state of at least one of the plurality of virtual processors is idle, identify the networking device associated with the at least one virtual processor in view of the mapping information;
query the networking device for one or more requests to be completed; and
process, by the hypervisor, the one or more requests.

13. A non-transitory computer readable storage medium, having instructions stored therein, which when executed by a processing device of a computer system, cause the processing device to:
identify, by the processing device executing an operating system, one or more interrupts of a networking device for an application;
queue the one or more interrupts of the networking device;
determine, by the processing device executing the operating system, an execution state of at least one application;
responsive to determining that the execution state is idle, provide, by the processing device executing the operating system, the one or more queued interrupts to the application; and
responsive to determining that the one or more queued interrupts have been queued for a period of time that meets a first threshold condition:
determine that the at least one application has transferred control of a physical processor to the operating system; and
provide, by the processing device executing the operating system, the one or more queued interrupts to the application.

14. The non-transitory computer readable storage medium of claim 13 , wherein to provide the queued interrupts, the processing device is to:
retrieve, by the operating system, the one or more queued interrupts from the networking device; and
send, by the operating system, the one or more queued interrupts to the at least one application.

15. The non-transitory computer readable storage medium of claim 13 , wherein the processing device is further to provide, by the operating system, the one or more queued interrupts to the application upon determining that the one or more queued interrupts have been queued for a period of time that meets a second threshold condition.

16. The non-transitory computer readable storage medium of claim 13 , wherein the processing device is further to:
receive, by the operating system, information from the application that maps the application to the networking device;
store, by the operating system, the mapping information in a data store accessible to the operating system; and
pair, by the operating system, the one or more queued interrupts with the application using the mapping information.

17. The non-transitory computer readable storage medium of claim 16 , wherein the processing device is further to:
upon determining that the execution state of the application is idle, identify the networking device associated with the application in view of the mapping information;
query the networking device for one or more requests to be completed; and
process, by the operating system,

Assignees

• Red Hat Israel Ltd
• Red Hat Israel Ltd

Inventors

• Tsirkin Michael S
• Bonzini Paolo

Classifications

• G06F2009/45595

  Network integration; Enabling network access in virtual machine instances · CPC title

• G06F9/4825

  Interrupt from clock, e.g. time of day · CPC title

• G06F9/45545 Primary

  Guest-host, i.e. hypervisor is an application program itself, e.g. VirtualBox · CPC title

• G06F9/4812

  by interrupt, e.g. masked · CPC title

• G06F9/45558 Primary

  Hypervisor-specific management and integration aspects · CPC title