linux-kernel - Re: [PATCH 3/4] KVM: PPC: Add support for IOMMU in-kernel handling

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Date:	Thu, 20 Jun 2013 17:47:29 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	David Gibson <david@...son.dropbear.id.au>
Cc:	Alexey Kardashevskiy <aik@...abs.ru>,
	Alex Williamson <alex.williamson@...hat.com>,
	Alexander Graf <agraf@...e.de>, linuxppc-dev@...ts.ozlabs.org,
	Paul Mackerras <paulus@...ba.org>,
	"kvm@...r.kernel.org mailing list" <kvm@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	kvm-ppc@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>,
	Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH 3/4] KVM: PPC: Add support for IOMMU in-kernel handling

On Thu, 2013-06-20 at 15:28 +1000, David Gibson wrote:
> > Just out of curiosity - would not get_file() and fput_atomic() on a
> group's
> > file* do the right job instead of vfio_group_add_external_user() and
> > vfio_group_del_external_user()?
> 
> I was thinking that too.  Grabbing a file reference would certainly be
> the usual way of handling this sort of thing.

But that wouldn't prevent the group ownership to be returned to
the kernel or another user would it ?

Ben.


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