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

From: Michael S. Tsirkin
Date: Thu Jun 24 2010 - 11:08:54 EST

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.

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