The -usb section of the man page is not very clear on what exactly -usb
does and fails to mention xHCI as a modern alternative (-device
nec-usb-xhci).
Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com>
---
qemu-options.hx | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/qemu-options.hx b/qemu-options.hx
index 9621e934c0..7d11c016d1 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1436,12 +1436,15 @@ STEXI
ETEXI
DEF("usb", 0, QEMU_OPTION_usb,
- "-usb enable the USB driver (if it is not used by default
yet)\n",
+ "-usb enable on-board USB host controller (if not enabled by
default)\n",
QEMU_ARCH_ALL)
STEXI
@item -usb
@findex -usb
-Enable the USB driver (if it is not used by default yet).
+Enable USB emulation on machine types with an on-board USB host controller (if
+not enabled by default). Note that on-board USB host controllers may not
+support USB 3.0. In this case -device nec-usb-xhci can be used instead on
+machines with PCI.
ETEXI
DEF("usbdevice", HAS_ARG, QEMU_OPTION_usbdevice,
--
2.21.0
