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

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Message-ID: <20100531171007.GA6516@redhat.com>
Date:	Mon, 31 May 2010 20:10:07 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Tom Lyon <pugs@...co.com>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, chrisw@...s-sol.org, joro@...tes.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 Mon, May 31, 2010 at 02:50:29PM +0300, Avi Kivity wrote:
> On 05/30/2010 05:53 PM, Michael S. Tsirkin wrote:
>>
>> So what I suggested is failing any kind of access until iommu
>> is assigned.
>>    
>
> So, the kernel driver must be aware of the iommu.  In which case it may  
> as well program it.

It's a kernel driver anyway. Point is that
the *device* driver is better off not programming iommu,
this way we do not need to reprogram it for each device.

> -- 
> I have a truly marvellous patch that fixes the bug which this
> signature is too narrow to contain.
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