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

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Date:	Wed, 02 Jun 2010 12:50:15 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Joerg Roedel <joro@...tes.org>
CC:	"Michael S. Tsirkin" <mst@...hat.com>, Tom Lyon <pugs@...co.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	chrisw@...s-sol.org, hjk@...utronix.de, gregkh@...e.de,
	aafabbri@...co.com, scofeldm@...co.com
Subject: Re: [PATCH] VFIO driver: Non-privileged user level PCI drivers

On 06/02/2010 12:42 PM, Joerg Roedel wrote:
> 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.
>    

This is non trivial with hotplug.

-- 
error compiling committee.c: too many arguments to function

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