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Date: Wed, 10 Aug 2016 10:43:03 +0300
From: Konstantin Belousov <kostikbel@gmail.com>
To: John Baldwin <jhb@freebsd.org>
Cc: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: Re: svn commit: r303887 - head/tools/tools/dmardump
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On Tue, Aug 09, 2016 at 02:22:36PM -0700, John Baldwin wrote:
> On Tuesday, August 09, 2016 07:06:05 PM John Baldwin wrote:
> > Author: jhb
> > Date: Tue Aug  9 19:06:05 2016
> > New Revision: 303887
> > URL: https://svnweb.freebsd.org/changeset/base/303887
> > 
> > Log:
> >   Add a dmardump utility to dump the VT-d context tables.
> >   
> >   This tool parses the ACPI DMAR table looking for DMA remapping devices.
> >   For each device it walks the root table and any context tables
> >   referenced to display mapping info for PCI devices.
> >   
> >   Note that acpidump -t already parses the info in the ACPI DMAR tables
> >   directly.  This tool examines some of the data structures the DMAR
> >   remapping engines use to translate DMA requests.
> >   
> >   Reviewed by:	kib, grehan
> >   MFC after:	1 month
> >   Sponsored by:	Chelsio Communications
> >   Differential Revision:	https://reviews.freebsd.org/D7444
> 
> I should have mentioned that this tool only supports "normal" context
> entry tables.  It does not (yet) support extended context entry
> tables.  However, neither bhyve nor ACPI_DMAR create extended context
> entry tables.

I am not aware of existence of hardware supporting the extended context
entries.  Even Skykale E3 v5 Xeons report ECS == 0.