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[Xen-devel] Infiniband modules for Xen guests

To: "Xen Devel List" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] Infiniband modules for Xen guests
From: "Adit Ranadive" <adit.262@xxxxxxxxx>
Date: Fri, 16 Mar 2007 14:31:55 -0400
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Has anyone tried installing the IB modules in Xen guest domains?
Im using the xen source tree locate here :

I have a Dell POweredge 1850 server and RHEL 4 installed. Im trying to
load the ib_gmthca module for my xen guest (FC4 install) and it gives
me the following error :

modprobe ib_gmthca
invalid host machine -1
[drivers/infiniband/hw/gmthca/gmthca_main.c:350],<1>Fail to setup hca,
return with EFAULT
FATAL: Error inserting ib_gmthca
Bad address

The guest domain must be able to detect the IB ports. Is there a way
to do that? Im guessing would still require that the hca driver be
loaded? BTW I can load all the other modules (ib_core, ib_ucm,
ib_uverbs, etc.) in the guest

My xen guest config is as follows :

kernel = "/boot/vmlinuz-2.6.16-rc3-xenU"
memory = 256
vif = ['bridge=xenbr0']
disk = [ 'file:/root/osimages/fedora.img,sda1,w' ]
root = "/dev/sda1 ro"
extra = "4"

Any ideas on how the mthca module is loaded in the guest?


Adit Ranadive
MS CS Candidate
Georgia Institute of Technology,
Atlanta, GA

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