From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alex Williamson <alex.williamson-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Subject: Re: Need information on type 2 IOMMU
Date: Sun, 9 Apr 2017 22:19:45 -0600
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To: valmiki <valmikibow-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
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On Mon, 10 Apr 2017 08:00:45 +0530
valmiki <valmikibow-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> Hi All,
> 
> We have drivers/vfio/vfio_iommu_type1.c. what is type1 iommu? Is it 
> w.r.t vfio layer it is being referred?
> 
> Is there type 2 IOMMU w.r.t vfio? If so what is it?

type1 is the 1st type.  It's an arbitrary name.  There is no type2, yet.