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: <20081203090304.GJ26275@8bytes.org>
Date:	Wed, 3 Dec 2008 10:03:04 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Greg KH <gregkh@...e.de>
Cc:	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 Tue, Dec 02, 2008 at 11:53:02PM -0800, Greg KH wrote:
> On Wed, Dec 03, 2008 at 08:50:49AM +0100, Joerg Roedel wrote:
> > On Tue, Dec 02, 2008 at 07:44:05PM -0800, Greg KH wrote:
> > > On Tue, Dec 02, 2008 at 02:01:11PM +0100, Joerg Roedel wrote:
> > > > Hi,
> > > > 
> > > > this patch series makes the current KVM device passthrough code generic
> > > > enough so that other IOMMU implementation can also plug into this code.
> > > > It works by factoring the functions Vt-d code exports to KVM into a
> > > > generic interface which allows different backends.
> > > > 
> > > > This is the second version of the patchset. The most important change to
> > > > the previous version is that this patchset was rebased to the improved
> > > > API from Han Weidong which supports multiple devices per IOMMU domain.
> > > > 
> > > > For completeness, this series also includes the patches from Han with
> > > > some cleanups. So this patchset can be applied on current avi/master
> > > > tree.
> > > 
> > > 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). So with the before mentioned
extensions it is also suitable for Calgary.

Joerg

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