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

[Gerd Hoffmann <kraxel@redhat.com>]

  Hi,

> > > -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?

That applies to windows 7 only, which is EOL next year.

win7 doesn't ship with xhci drivers, but you can download and use
nec/renesas drivers which require nec-usb-xhci.

win8+ ships with generic xhci drivers which works with all xhci
hardware, including qemu-xhci.

So it indeed makes sense to refer to qemu-xhci.

cheers,
  Gerd