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From: Gerd Hoffmann <kraxel@redhat.com>
Date: Tue, 21 Apr 2015 17:14:04 +0200
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Subject: Re: [Qemu-devel] [PATCH 6/6] [wip] tseg, part2, not (yet) tested
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To: Laszlo Ersek <lersek@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>, qemu-devel@nongnu.org, mst@redhat.com

> > tseg_blackhole is added on top of address_space_memory to hide TSEG;
> > tseg_window is included in /machine/smram and TCG adds it to the private
> > per-CPU address space when it enters system management mode.
> 
> Hm, I must have missed this (or not seen it at all) -- should I have
> noticed it in Gerd's series somewhere (or in yours)? Or is that by
> virtue of mapping mch->tseg_window as a subregion of mch->smram?

Yes.  mch->smram holds the memory regions accessible in smm mode only.

> (These overlays are pretty confusing, without a graphical visualization :))

Try 'info mtree'.

cheers,
  Gerd