Migrating a virtual machine that owns a resource such as a hardware device

摘要

A computing device has first and second virtual machines (VMs) and a resource assigned to the first VM. Each access request for the resource is forwarded thereto until the first VM is to be saved or migrated. Thereafter, each access request is forwarded to a holding queue. When the resource has acted upon all access requests forwarded thereto, the resource is reassigned to the second VM, and each access request at the holding queue is forwarded to the second VM and then the resource. Thus, all access requests for the resource are acted upon by the resource even after the resource is removed from the first VM and assigned to the second VM, and the save or migrate of the first VM can thereafter be completed.

主权项

1. A method comprising:
forwarding an access request from a resource stack to a resource to be acted upon by such resource by way of a first port on a first virtual machine (VM); forwarding at least one subsequent access request from the resource stack to be queued at a second port; assigning the resource to a second VM such that the second VM controls the resource; and wherein the at least one subsequent access request is acted upon by the resource by way of the second virtual machine.