linux-kernel - Re: [PATCH V2] VFIO driver: Non-privileged user level PCI drivers

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Date:	Thu, 24 Jun 2010 18:03:35 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Joerg Roedel <joro@...tes.org>
Cc:	Tom Lyon <pugs@...n-about.com>, randy.dunlap@...cle.com,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	chrisw@...s-sol.org, hjk@...utronix.de, avi@...hat.com,
	gregkh@...e.de, aafabbri@...co.com, scofeldm@...co.com
Subject: Re: [PATCH V2] VFIO driver: Non-privileged user level PCI drivers

On Thu, Jun 24, 2010 at 02:22:19PM +0200, Joerg Roedel wrote:
> On Thu, Jun 17, 2010 at 02:14:00PM -0700, Tom Lyon wrote:
> > On Sunday 13 June 2010 03:23:39 am Michael S. Tsirkin wrote:
> 
> > OK, after more investigation, I realize you are right.
> > We definitely need the IOMMU protection for interrupts, and
> > if we have it, a lot of the code for config space protection is pointless.
> > It does seem that the Intel  intr_remapping code does what we want
> > (accidentally) but that the AMD iommu code does not yet do any
> > interrupt remapping.  Joerg - can you comment? On the roadmap?
> 
> Work on this is planned, but not at a high priority by now. I can
> re-prioritize this item if needed.
> 
> 	Joerg

As a stop-gap measure, we could get by with a
portable API that let us figure out whether a given iommu supports
interrupt remapping.

-- 
MST
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