Re: [Xen-users] Accessing /dev/ttyI0 in guest domain not possible?

[forumuser@xxxxxxxxxx]

Hi Mark,

Making some progress now. However, I still have some problems although it
looks I can access the ISDN card so now and then.

This is what I have done:

title Xen 2.0 / XenLinux 2.6.11 rks
   kernel /boot/xen.gz dom0_mem=64000 console=vga physdev_dom0_hide=(01:0d.0)
   module /boot/vmlinuz-2.6.11-rks-xen0 root=/dev/hda3 ro console=tty0

And in my guest OS I put the line: pci = ['01,0e,0'] so I will have access
to my ISDN PCI card. Asterisk is not complaining anymore, but no calls are
 ISDN calls are "seen" by my gues OS.

Using lspvc -v I found out that the ISDN card did not got an IRQ, so I
inserted the card in another PCI-slot and rebooted the system. Now I get
the message that shows me an IRQ has been found:

ISDN subsystem Rev: 1.1.2.3/1.1.2.3/1.1.2.2/1.1.2.3/1.1.2.2/1.1.2.2
dss1_divert module successfully installed
HiSax: Linux Driver for passive ISDN cards
HiSax: Version 3.5 (kernel)
HiSax: Layer1 Revision 2.46.2.5
HiSax: Layer2 Revision 2.30.2.4
HiSax: TeiMgr Revision 2.20.2.3
HiSax: Layer3 Revision 2.22.2.3
HiSax: LinkLayer Revision 2.59.2.4
HiSax: Total 0 card defined
hisax_isac: ISAC-S/ISAC-SX ISDN driver v0.1.0
hisax_fcpcipnp: Fritz!Card PCI/PCIv2/PnP ISDN driver v0.0.1
HiSax: Card 1 Protocol EDSS1 Id=fcpcipnp0 (0)
HiSax: DSS1 Rev. 2.32.2.3
HiSax: 2 channels added
HiSax: MAX_WAITING_CALLS added
PCI: Obtained IRQ 21 for device 0000:01:0d.0
hisax_fcpcipnp: found adapter Fritz!Card PCI at 0000:01:0d.0

The only thing that worries me is the line "HiSax: Total 0 card defined".

lspci -v looks ok now:
0000:01:0d.0 Network controller: AVM Audiovisuelles MKTG & Computer System
GmbH A1 ISDN [Fritz] (rev 02)
        Subsystem: AVM Audiovisuelles MKTG & Computer System GmbH
FRITZ!Card ISDN Controller
        Flags: medium devsel, IRQ 21
        Memory at febfff60 (32-bit, non-prefetchable) [size=32]
        I/O ports at 7860 [size=32]

However, no calls are recognized by the card....

Now I start my guest OS (changing the  pci = ['01,0e,0'] to  pci =
['01,0d,0'] which sees my ISDN card:

HiSax: Linux Driver for passive ISDN cards
HiSax: Version 3.5 (kernel)
HiSax: Layer1 Revision 2.46.2.5
HiSax: Layer2 Revision 2.30.2.4
HiSax: TeiMgr Revision 2.20.2.3
HiSax: Layer3 Revision 2.22.2.3
HiSax: LinkLayer Revision 2.59.2.4
hisax_isac: ISAC-S/ISAC-SX ISDN driver v0.1.0
hisax_fcpcipnp: Fritz!Card PCI/PCIv2/PnP ISDN driver v0.0.1
HiSax: Card 1 Protocol EDSS1 Id=fcpcipnp0 (0)
HiSax: DSS1 Rev. 2.32.2.3
HiSax: 2 channels added
HiSax: MAX_WAITING_CALLS added
PCI: Obtained IRQ 21 for device 0000:01:0d.0
hisax_fcpcipnp: found adapter Fritz!Card PCI at 0000:01:0d.0

But again, no calls are recognized.

I have the feeling that this is an IRQ problem. I restarted the system
several times and I got it working once....

Does xen do anything special with interrupts I should be aware of?

Thanks,
Rene









>> Now I started up my xenU domain which does not show anything about found
>> ISDN cards, but I am not worried as I don't see any message about
>> network
>> cards either which work perfectly.
>
> The default configuration uses a virtual network card - network traffic
> gets
> sent via dom0, which owns the *real* network card.
>
>> But when starting my Asterisk server in the xenU domain I get some
>> errors:
>> Jul  3 18:10:36 ERROR[865]: Unable to register channel '/dev/ttyI0'
>> Jul  3 18:10:36 WARNING[865]: chan_modem.so: load_module failed,
>> returning
>> -1 Jul  3 18:10:36 WARNING[865]: Loading module chan_modem.so failed!
>>
>> So it looks that an unpriviliged domain cannot access my ISDN card?
>
> The XenU kernel won't support any real hardware devices, only Xen's
> virtual
> devices.
>
>> Digging further, I decided to boot a xen0 domain as guest instead of
>> xenU.
>> Now my ISDN card is recognized although not installed(?)
>
>> HiSax: AVM PCI driver Rev. 1.29.2.4
>> FritzPCI: No PCI card found
>> HiSax: Card AVM Fritz PnP/PCI not installed !
>>
>> Asterisk doesn't complain anymore although I am not sure if it works...
>>
>> Does anyone know why xenU is not allowed to access my ISDN /dev/ttyI0?
>
> You need to give the domain direct access to the ISDN card.  This is
> important
> because only one domain can own a PCI card at once.  Multiple drivers
> fighting over a PCI card will end in tears...
>
> You need to hide the PCI device from dom0 so that it doesn't try to drive
> it:
> add "physdev_dom0_hide=(xx.yy.z)" to Xen's commandline, substituting the
> config address of your card (you can find this in the output of "lspci").
>
> When you boot, check "xm dmesg" for an explicit line from Xen saying that
> it's
> hiding the PCI device.  If there isn't one then something's wrong - you'll
> have to debug this first.
>
> Once hiding the device works, you need to give the domain access to it.
> You
> need to add this to the config file - the syntax for this is (I think)
> described in the user manual.
>
> Once you've done those things, boot the xen0 kernel in the domain and it
> should work.  Let us know if you get stuck.
>
> Cheers,
> Mark
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
>
>


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