Re: [PATCH 0/12] Factor VT-d KVM functions into a generic API(with multiple device assignment support)

From: Muli Ben-Yehuda
Date: Thu Dec 04 2008 - 05:47:26 EST

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.

The First Workshop on I/O Virtualization (WIOV '08)
Dec 2008, San Diego, CA,
SYSTOR 2009---The Israeli Experimental Systems Conference
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