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Date:	Sun, 30 May 2010 16:01:53 +0300
From:	Avi Kivity <>
To:	"Michael S. Tsirkin" <>
CC:	Tom Lyon <>,,,,,,,,
Subject: Re: [PATCH] VFIO driver: Non-privileged user level PCI drivers

On 05/30/2010 03:49 PM, Michael S. Tsirkin wrote:
> On Sun, May 30, 2010 at 03:27:05PM +0300, Avi Kivity wrote:
>> On 05/30/2010 03:19 PM, Michael S. Tsirkin wrote:
>>> On Fri, May 28, 2010 at 04:07:38PM -0700, Tom Lyon wrote:
>>>> The VFIO "driver" is used to allow privileged AND non-privileged processes to
>>>> implement user-level device drivers for any well-behaved PCI, PCI-X, and PCIe
>>>> devices.
>>>> 	Signed-off-by: Tom Lyon<>
>>>> ---
>>>> This patch is the evolution of code which was first proposed as a patch to
>>>> uio/uio_pci_generic, then as a more generic uio patch. Now it is taken entirely
>>>> out of the uio framework, and things seem much cleaner. Of course, there is
>>>> a lot of functional overlap with uio, but the previous version just seemed
>>>> like a giant mode switch in the uio code that did not lead to clarity for
>>>> either the new or old code.
>>> IMO this was because this driver does two things: programming iommu and
>>> handling interrupts. uio does interrupt handling.
>>> We could have moved iommu / DMA programming to
>>> a separate driver, and have uio work with it.
>>> This would solve limitation of the current driver
>>> that is needs an iommu domain per device.
>> How do we enforce security then?  We need to ensure that unprivileged
>> users can only use the device with an iommu.
> Force assigning to iommu before we allow any other operation?

That means the driver must be aware of the iommu.

error compiling committee.c: too many arguments to function

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