Re: [Qemu-devel] OVMF, Q35 and USB keyboard/mouse

["Gabriel L. Somlo" <gsomlo@gmail.com>]

On Fri, Sep 12, 2014 at 08:26:01PM +0200, Paolo Bonzini wrote:
> So it could be an OVMF bug related to multifunction devices.
> 
> Well, you could try moving devices around in different functions.
> You could try moving ehci1 to 0 and the UHCIs to 1/2/7.
> 
> Or drop uhci2/uhci3 and move the two remaining devices around.  Once you
> have three combinations that work (e.g. 0/4, 0/6, 0/7) you could use it
> to add three UHCI controllers (in the above examples, it would be 0/1/2/7).
> 
> Remember that one of the two must be xx.0, the other can be anything
> from xx.1 to xx.7.

I moved things around as you suggested (from hw/usb/hcd-ehci-pci.c and
the ich9_1d[] array).

No matter which PCI function gets assigned to which device, and no
matter which order the uhci1/2/3 devices are listed in ich9_1d[],
it's *always* uhci3 (dev.id. 2936) and ehci being shown, and uhci1&2
end up missing.

System Information looks like this (high-speed kbd/mouse patch is
applied, so I'm looking for whether uhci2/3 show up in the list or
not, but wanted to always have mouse and keyboard available on ehci):

    USB Device Tree:

--->USB Bus<---
  v USB Hi-Speed Bus
       QEMU USB Keyboard
       QEMU USB Mouse


    USB Bus:

    Host Controller Location: Expansion Slot
    Host Controller Driver:   AppleUSBUHCI
    PCI Device ID:            0x2936
    PCI Revision ID:          0x0003
    PCI Vendor ID:            0x8086
    Bus Number:               0x5d

The bus number varies (depending on which function I hard-coded for
uhci3, e.g. 3d when I had it at 00:1d.1, 5d for the default 00:1d.2,
etc.) but it's always uhci3...


Interestingly, if I comment out uhci3, it's only ehci that shows up,
not uhci1 or uhci2 (even though one of them is 00:1d.0). 


Feels like there's some thing "magical" about the uhci3 name or device
ID. Maybe at this point I should go fishing in the edk2 source :) 

Thanks,
--Gabriel