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

[Avi Kivity]

On 05/31/2010 08:10 PM, Michael S. Tsirkin wrote:
> 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.
>    

The device driver is in userspace.  It can't program the iommu.  What 
the patch proposes is that userspace tells vfio about the needed 
mappings, and vfio programs the iommu.

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/