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usb: reword -usb command-line option and mention xHCI 

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 <stefanha@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-id: 20190815141428.29080-1-stefanha@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2019-08-15 15:14:28 +01:00 committed by Gerd Hoffmann
parent dc2c037fd2
commit 73f46fef74
1 changed files with 5 additions and 2 deletions
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7
qemu-options.hx
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@ -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 @option{-device qemu-xhci} can be used instead
on machines with PCI.
ETEXI
DEF("usbdevice", HAS_ARG, QEMU_OPTION_usbdevice,