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authorGerd Hoffmann <kraxel@redhat.com>2012-05-29 11:20:31 +0200
committerAnthony Liguori <aliguori@us.ibm.com>2012-05-30 10:28:44 +0800
commite78bd5ab07d65fec77fcae468b2836c79a836d49 (patch)
treee7455655fbf41dd901833333927f72c7e5adb044 /docs
parent1643f2b232628905e8f32965ff36a87bd53b93c5 (diff)
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xhci: add usage info to docs
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'docs')
-rw-r--r--docs/usb2.txt15
1 files changed, 15 insertions, 0 deletions
diff --git a/docs/usb2.txt b/docs/usb2.txt
index 228aa33..d17e3c0 100644
--- a/docs/usb2.txt
+++ b/docs/usb2.txt
@@ -55,6 +55,21 @@ try ...
... then use "bus=ehci.0" to assign your usb devices to that bus.
+xhci controller support
+-----------------------
+
+There also is xhci host controller support available. It got alot
+less testing than ehci and there are a bunch of known limitations, so
+ehci may work better for you. On the other hand the xhci hardware
+design is much more virtualization-friendly, thus xhci emulation uses
+less ressources (especially cpu). If you wanna give xhci a try
+use this to add the host controller ...
+
+ qemu -device nec-usb-xhci,id=xhci
+
+... then use "bus=xhci.0" when assigning usb devices.
+
+
More USB tips & tricks
======================