From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Monjalon <thomas@monjalon.net>
Subject: Re: [PATCH] eal: add option to force IOVA as PA mode
Date: Thu, 30 Nov 2017 10:17:52 +0100
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References: <20171130025739.4349-1-3chas3@gmail.com>
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Cc: dev@dpdk.org, anatoly.burakov@intel.com, Chas Williams <chas3@att.com>
To: Chas Williams <3chas3@gmail.com>
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30/11/2017 03:57, Chas Williams:
> From: Chas Williams <chas3@att.com>
> 
> The IOMMU in some machines report that they can only support
> limited widths.  IOVA virtual addresses may exceed this width
> making the use of IOVA virtual addresses difficult.  The option
> CONFIG_RTE_LIBRTE_USE_PHYS_IOVA can used to force IOVA physical
> address usage.

Which machines are you talking about?
A run-time option may be a better solution.