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

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Message-ID: <20081204104702.GE5541@il.ibm.com>
Date:	Thu, 4 Dec 2008 05:47:02 -0500
From:	Muli Ben-Yehuda <muli@...ibm.com>
To:	Joerg Roedel <joro@...tes.org>
Cc:	Greg KH <gregkh@...e.de>, Joerg Roedel <joerg.roedel@....com>,
	kvm@...r.kernel.org, Han Weidong <weidong.han@...el.com>,
	linux-kernel@...r.kernel.org, Alexander Graf <agraf@...e.de>,
	iommu@...ts.linux-foundation.org, Ingo Molnar <mingo@...hat.com>,
	Avi Kivity <avi@...hat.com>
Subject: Re: [PATCH 0/12] Factor VT-d KVM functions into a generic API
	(with multiple device assignment support)

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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