Re: iommu external module

[Muli Ben-Yehuda <muli@il.ibm.com>]

On Thu, Oct 02, 2008 at 03:45:33PM +0300, Avi Kivity wrote:

> We can fix this fairly simply by having an external module for the
> iommus, much like kvm itself.  I don't think it should be too
> difficult, and it will provide a lot of testing to us, and important
> functionality for our users.

The problem is that if we want to enable DMA translation for a given
device, we have to do it before it has any outstanding DMAs. As long
as you have a device that you want to enable translation for as
built-in, you'll need the IOMMU built-in as well, or will need to
reset the device when you load the IOMMU. That's why all IOMMUs are
currently built-in.

Cheers,
Muli
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