Date: Thu, 4 Dec 2008 05:47:02 -0500
From: Muli Ben-Yehuda <muli@il.ibm.com>
To: Joerg Roedel <joro@8bytes.org>
Cc: Greg KH <gregkh@suse.de>, Joerg Roedel <joerg.roedel@amd.com>,
       kvm@vger.kernel.org, Han Weidong <weidong.han@intel.com>,
       linux-kernel@vger.kernel.org, Alexander Graf <agraf@suse.de>,
       iommu@lists.linux-foundation.org, Ingo Molnar <mingo@redhat.com>,
       Avi Kivity <avi@redhat.com>
Subject: Re: [PATCH 0/12] Factor VT-d KVM functions into a generic API
	(with multiple device assignment support)
Message-ID: <20081204104702.GE5541@il.ibm.com>
References: <1228222883-17207-1-git-send-email-joerg.roedel@amd.com> <20081203034405.GA23835@suse.de> <20081203075049.GN29705@8bytes.org> <20081203075302.GA13420@suse.de> <20081203090304.GJ26275@8bytes.org>
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On Wed, Dec 03, 2008 at 10:03:04AM +0100, Joerg Roedel wrote:

> > > > Have you tried porting any of the current iommu controllers to
> > > > this new framework to see if it works properly for them?
> > > 
> > > It works currently for VT-d. I also port it to AMD IOMMU
> > > currently. With some extensions (offset for start address, flags
> > > and size limitation) it is also suitable for IOMMUs like GART or
> > > similar ones.
> > 
> > What about the Calgary chipset?
> 
> Calgary is quite similar to GART (there is something like the
> aperture and a linear single-level pagetable).

Actually, Calgary has multiple per-bus address spaces (each of which
is a single-level linear pagetable limited to 4GB of addressable
memory), so I think it should work with your current approach pretty
much as is, once we take into account these two (per-bus and 32-bit
addressability) limitations.

Cheers,
Muli
-- 
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Dec 2008, San Diego, CA, http://www.usenix.org/wiov08/
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