Xen users - Nov 2005 - Xen driver domain...character device?

Greetings,

Does anyone know if it is possible to give a guest domain access to character
device hardware such as a SCSI tape drive (/dev/st0 | /dev/nst0)?  I have
recompiled the guest xenU kernel with hardware access and declared the pci SCSI
card in the config file directive as follows:
pci      = [ ''4,3,0'' ]

The log file when started reports:
[2005-11-01 17:24:57 xend] DEBUG (XendDomainInfo:1178) Creating pci device dom=7
bus=4 dev=3 func=0

_________
Sincerely,

David Closson
Network Engineer

OneInterface.net Network Engineering, Inc.
575 Minnewawa Avenue, Suite 4, Clovis, CA  93612
Office: 559-322-5203  Fax: 559-322-5219 Cell: 559-283-2015

Email: dave@oneinterface.net
GnuPG: http://www.oneinterface.net/crypt/dave.asc

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On Wednesday 02 November 2005 18:05, dave@oneinterface.net
wrote:
> Greetings,
>
> Does anyone know if it is possible to give a guest domain access to
> character device hardware such as a SCSI tape drive (/dev/st0 | /dev/nst0)?
>  I have recompiled the guest xenU kernel with hardware access and declared
> the pci SCSI card in the config file directive as follows:
> pci      = [ ''4,3,0'' ]
>
> The log file when started reports:
> [2005-11-01 17:24:57 xend] DEBUG (XendDomainInfo:1178) Creating pci device
> dom=7 bus=4 dev=3 func=0
You always give an entire PCI device to a domU, whatever device nodes the domU 
driver creates for it is completely beyond the control of xen.

My quess would be you''re missing the SCSI adaptor driver in domU, or
don''t
have scsi-tape support in it if it isn''t working.

just recheck your domU kernel config, activate what you need and recompile.

if the tape device works as expected in dom0 (if you don''t hide the pci
device
from it), you might try using the dom0 kernel for your domU as well.
(Don''t
forget to install the right modules into the domU FS) 

/Ernst

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> Does anyone know if it is possible to give a guest domain access to
> character device hardware such as a SCSI tape drive (/dev/st0 | /dev/nst0)?
>  I have recompiled the guest xenU kernel with hardware access and declared
> the pci SCSI card in the config file directive as follows:
> pci      = [ ''4,3,0'' ]
Did you also ignore the device in dom0 (e.g. by using
"physdev_dom0_hide=" on
the Xen command line or by not compiling the driver into dom0)?  Don''t
want
the two domains to fight...

Try running lspci in the guest and see what it does...

Cheers,
Mark
> The log file when started reports:
> [2005-11-01 17:24:57 xend] DEBUG (XendDomainInfo:1178) Creating pci device
> dom=7 bus=4 dev=3 func=0
>
> _________
> Sincerely,
>
> David Closson
> Network Engineer
>
> OneInterface.net Network Engineering, Inc.
> 575 Minnewawa Avenue, Suite 4, Clovis, CA  93612
> Office: 559-322-5203  Fax: 559-322-5219 Cell: 559-283-2015
>
> Email: dave@oneinterface.net
> GnuPG: http://www.oneinterface.net/crypt/dave.asc
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
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Another point: it doesn''t matter what kind of device (character, block,
etc)
if you''re exporting at the PCI level.

In contrast at the virtual device level there''s not a standard way of 
exporting a device, although I understand there are some standard means of 
exporting a tape backup device to the network.  If it performs OK, you may 
find it simpler to do this rather than PCI device assignment.

Cheers,
Mark

On Wednesday 02 November 2005 17:05, dave@oneinterface.net
wrote:
> Greetings,
>
> Does anyone know if it is possible to give a guest domain access to
> character device hardware such as a SCSI tape drive (/dev/st0 | /dev/nst0)?
>  I have recompiled the guest xenU kernel with hardware access and declared
> the pci SCSI card in the config file directive as follows:
> pci      = [ ''4,3,0'' ]
>
> The log file when started reports:
> [2005-11-01 17:24:57 xend] DEBUG (XendDomainInfo:1178) Creating pci device
> dom=7 bus=4 dev=3 func=0
>
> _________
> Sincerely,
>
> David Closson
> Network Engineer
>
> OneInterface.net Network Engineering, Inc.
> 575 Minnewawa Avenue, Suite 4, Clovis, CA  93612
> Office: 559-322-5203  Fax: 559-322-5219 Cell: 559-283-2015
>
> Email: dave@oneinterface.net
> GnuPG: http://www.oneinterface.net/crypt/dave.asc
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
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