Re: [Xen-users] Debian Squeeze - XEN and PCI Passthrough - SOLVED

["Daniel Bauer" <mlist@xxxxxxxxxxx>]

From: "Daniel Bauer"
> I tried to give a PCI device to a domU with
>
>    module  /boot/vmlinuz-3.2.0-0.bpo.2-amd64 ... xen-pciback.hide=(02:01.0)
>
> vai /boot/grub/grub.cfg
>
>
> The startup of the domU shows this error:
>
> Loading DAHDI hardware modules:
> [    5.475642] dahdi: Telephony Interface Registered on major 196
> [    5.475660] dahdi: Version: 2.6.1
>   wcb4xxp: [    5.559401] wcb4xxp 0000:02:01.0: probe called for b4xx...
> [    5.559552] wcb4xxp 0000:02:01.0: enabling device (0000 -> 0003)
> [    5.561039] wcb4xxp 0000:02:01.0: Xen PCI enabling IRQ: 0
> [    5.561039] xen_allocate_pirq: returning irq 0 for gsi 0
> [    5.561039] wcb4xxp 0000:02:01.0: Device has no associated IRQ?
> [    5.561039] wcb4xxp: probe of 0000:02:01.0 failed with error -5
> done
> Running dahdi_cfg: .
>
>
> also a lspci shows different to to dom0:
>
> root@rz3-ta:~# lspci -vv
> 02:01.0 Non-VGA unclassified device: Digium, Inc. Wildcard B410 quad-BRI card 
> (rev 01)
>        Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- 
> Stepping- SERR- FastB2B- DisINTx-
>        Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- 
> <MAbort- >SERR- <PERR- INTx-
>        Region 0: I/O ports at 2000 [size=8]
>        Region 1: Memory at ec200000 (32-bit, non-prefetchable) [size=4K]
>
>
> Thats the output without pciback:
>
> root@rz3-xen1:~# lspci -vv -s 02:01.0
> 02:01.0 ISDN controller: Digium, Inc. Wildcard B410 quad-BRI card (rev 01)
>        Subsystem: Digium, Inc. Wildcard B410 quad-BRI card
>        Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- 
> Stepping- SERR+ FastB2B- DisINTx-
>        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- 
> <MAbort- >SERR- <PERR- INTx-
>        Interrupt: pin A routed to IRQ 7
>        Region 0: I/O ports at 2000 [size=8]
>        Region 1: Memory at ec200000 (32-bit, non-prefetchable) [size=4K]
>        Capabilities: [40] Power Management version 2
>                Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA 
> PME(D0+,D1+,D2+,D3hot+,D3cold-)
>                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-

I've plugged in a second PCI card, it's not important which one. After this there is an IRQ in the domU and everything works fine. I 
don't understand this behaviour ...
Daniel


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