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

[Laszlo Ersek <lersek@redhat.com>]

On 09/12/14 21:59, Gabriel L. Somlo wrote:
> 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 :) 

Right, a bit earlier I thought of devids being special maybe and grepped
edk2 for "2936" -- no luck. There are hits but they all seem unrelated.

Laszlo