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@@ -55,6 +55,21 @@ try ...
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... then use "bus=ehci.0" to assign your usb devices to that bus.
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+xhci controller support
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+-----------------------
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+
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+There also is xhci host controller support available. It got alot
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+less testing than ehci and there are a bunch of known limitations, so
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+ehci may work better for you. On the other hand the xhci hardware
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+design is much more virtualization-friendly, thus xhci emulation uses
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+less ressources (especially cpu). If you wanna give xhci a try
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+use this to add the host controller ...
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+
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+ qemu -device nec-usb-xhci,id=xhci
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+
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+... then use "bus=xhci.0" when assigning usb devices.
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+
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+
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More USB tips & tricks
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======================
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Gerd Hoffmann