From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: AMD_IOV: IO_PAGE_FALT trying to pass through
	Mellanox ConnectX HCA (debian testing)
Date: Mon, 31 Jan 2011 13:45:03 -0500
Message-ID: <20110131184503.GB11939@dumpdata.com>
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> Hmm, I do have it:

Indeed you do. Good!

> 
>   # xm dmesg |grep iommu
>   (XEN) Command line: placeholder iommu=pv,verbose,amd_iommu_debug
> 
> But maybe it's not being picked up?

You should see something passthrough in the log.. thought that might
be only if you are using Intel VT-d? Not sure.
> 
> > you might need to make sure your driver is using the VM_IO flag.
> > 
> > There was some discussion on LKML about this and they proposed
> > a patch that wasn't neccessary. Don't remember the details but I can
> > look that up next week.

Found it.. it was from Vivien but in another thread:
http://www.mail-archive.com/linux-rdma@vger.kernel.org/msg06980.html