Re: [Qemu-devel] [PATCH] usb: reword -usb command-line option and mention xHCI

[Stefan Hajnoczi]

On Tue, Aug 13, 2019 at 07:54:16PM +0200, Thomas Huth wrote:
> On 8/13/19 3:30 PM, Stefan Hajnoczi wrote:
> > 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 <address@hidden>
> > ---
> >  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
> 
> Should we maybe rather recommend qemu-xhci instead?

I think nec-usb-xhci is preferred because there are Windows drivers.
IIRC qemu-xhci works under Linux but not under Windows (just because the
PCI Vendor/Device ID aren't covered by any driver).

Gerd: Can you confirm this?

Stefan

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