Sharing unclaimed USB devices as PCI devices
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United States of America Patent
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Oct 31, 2017
Issued Date -
N/A
app pub date -
Aug 27, 2014
filing date -
Aug 27, 2014
priority date (Note) -
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Abstract
Examples of the disclosure safely share universal service bus (USB) devices with peripheral component interconnect (PCI) passthrough, and share devices in the USB hierarchy. An in-use counter is maintained for the USB bus and/or for USB hubs. The in-use counter is checked and adjusted when a VM or entity claims and/or unclaims a device. For example, when a PCI passthrough of a USB host controller device is requested, the global in-use counter is checked to determine whether to grant the request. When a VM or entity requests to claim a USB hub, the in-use counter is checked to determine whether to grant the request. The in-use counter indicates whether any USB device attached has been claimed and/or whether the USB host controller device has been claimed by a PCI passthrough operation.
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