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

[Joerg Roedel]

On Tue, Jun 01, 2010 at 12:55:32PM +0300, Michael S. Tsirkin wrote:

> There seems to be some misunderstanding.  The userspace interface
> proposed forces a separate domain per device and forces userspace to
> repeat iommu programming for each device.  We are better off sharing a
> domain between devices and programming the iommu once.
> 
> The natural way to do this is to have an iommu driver for programming
> iommu.

IMO a seperate iommu-userspace driver is a nightmare for a userspace
interface. It is just too complicated to use. We can solve the problem
of multiple devices-per-domain with an ioctl which allows binding one
uio-device to the address-space on another. Thats much simpler.

	Joerg

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