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[PATCH v8 10/18] docs/system/devices/usb: Note the automatic hub change
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- From: Jamin Lin <jamin_lin@xxxxxxxxxxxxxx>
- Date: Mon, 2 Nov 2026 09:22:17 +0000
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- Cc: Jamin Lin <jamin_lin@xxxxxxxxxxxxxx>, Troy Lee <troy_lee@xxxxxxxxxxxxxx>
- Delivery-date: Mon, 02 Nov 2026 09:24:50 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHdaqunzKBY01X8UU66zw8KbkYNag==
- Thread-topic: [PATCH v8 10/18] docs/system/devices/usb: Note the automatic hub change
The automatic hub is now off for a new machine type.
Signed-off-by: Jamin Lin <jamin_lin@xxxxxxxxxxxxxx>
---
docs/system/devices/usb.rst | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/docs/system/devices/usb.rst b/docs/system/devices/usb.rst
index dc694d23c2..24e8ccf96e 100644
--- a/docs/system/devices/usb.rst
+++ b/docs/system/devices/usb.rst
@@ -3,8 +3,11 @@ USB emulation
QEMU can emulate a PCI UHCI, OHCI, EHCI or XHCI USB controller. You can
plug virtual USB devices or real host USB devices (only works with
-certain host operating systems). QEMU will automatically create and
-connect virtual USB hubs as necessary to connect multiple USB devices.
+certain host operating systems).
+
+A machine type older than 11.2 plugs a virtual USB hub into the last
+free port, so that more devices fit. A newer one does not, and a
+device that finds no free port fails.
USB controllers
~~~~~~~~~~~~~~~
--
2.43.0
|
