linux-kernel - Re: [PATCH v2] misc: Reserve minor for VFIO

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Date:	Wed, 18 Dec 2013 14:04:16 -0700
From:	Alex Williamson <alex.williamson@...hat.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, gnomes@...rguk.ukuu.org.uk,
	arnd@...db.de, hpa@...or.com
Subject: Re: [PATCH v2] misc: Reserve minor for VFIO

On Wed, 2013-12-18 at 13:01 -0800, Greg KH wrote:
> On Wed, Dec 18, 2013 at 01:56:32PM -0700, Alex Williamson wrote:
> > VFIO currently allocates it's own dynamic chardev range, reserving the
> > first minor for the control part of the interface (/dev/vfio/vfio) and
> > the remainder for VFIO groups (/dev/vfio/$GROUP).  This works, but it
> > doesn't support auto loading.  For instance when libvirt checks for
> > VFIO support it looks for /dev/vfio/vfio, which currently doesn't
> > exist unless the vfio module is loaded.  By converting the control
> > device to a misc driver and reserving a static minor, we can enable
> > auto loading.
> > 
> > Reserving the minor is a prerequist to that conversion.  Minor 196
> > is unused by anything currently in the kernel.
> > 
> > Suggested-by: Paolo Bonzini <pbonzini@...hat.com>
> > Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
> > ---
> > 
> > v2: Plea for ack edition
> > 
> > As Alan suspected, there's been no response from device@...ana.org,
> > so there's probably nobody monitoring it anymore.  I've done due
> > diligence looking at all the callers of misc_register() in linux-next
> > and cannot find any conflicts with minor 196.  If anyone wants to toss
> > me an ack or sign-off I'll be happy to bring this in through my vfio
> > tree, otherwise I'd appreciate if someone wants to take it directly.
> > Thanks!
> > 
> >  Documentation/devices.txt  |    1 +
> >  include/linux/miscdevice.h |    1 +
> >  2 files changed, 2 insertions(+)
> 
> Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> Feel free to take this through your tree.

Thanks!

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