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

[forumuser@xxxxxxxxxx]

Hi,

Ok, tried another day swapping the cards to get this working, but no luck :-(

To answer your questions:

Output of "xm dmesg" (last few lines)

(XEN) Scrubbing DOM0 RAM: .done.
(XEN) Hiding PCI device 01:08.0 from DOM0
(XEN) Scrubbing Free RAM: ...done.
(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch input
to Xen).

So Dom0 is hiding my ISDN card (note that the ISDN card is now in another
PCI slot)

I am not sure how to dial out as I am using Asterisk normally. Let me see
if I can get this working. Also, I will try to install the ISDN card in
another PC installing xen to see if this makes a difference. I will give
some feedback when this all has been completed.

Rene




>> 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
>
> Looks good.  Do you see the appropriate message from Xen at boot time,
> confirming that the card really is hidden?
>
>> 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:
>
> This is strange, it should just work.  I guess your machine is probably
> sharing IRQs but that should work with Xen too.
>> 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]
>
> Looks sane.  Can you confirm that the card doesn't appear in dom0?  Try
> lspci
> (and inspect the boot output).  We don't want the domains to fight.
>
>> But again, no calls are recognized.
>
> Can you try doing an outgoing call (e.g. fax someone) and see if that
> works?
>
>> 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?
>
> I guess it could be an IRQ problem.  We've not seen this behaviour before
> (that I know of) but I guess it could have been tickled by some quirk of
> your
> machine setup.
>
> Cheers,
> Mark
>
>>
>> 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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>
>


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