From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: [PATCH V2] VFIO driver: Non-privileged user level PCI drivers
Date: Wed, 9 Jun 2010 19:05:50 +0300
Message-ID: <20100609160550.GA22312@redhat.com>
References: <4c0eb470.1HMjondO00NIvFM6%pugs@cisco.com>
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Cc: randy.dunlap@oracle.com, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org, chrisw@sous-sol.org, joro@8bytes.org,
	hjk@linutronix.de, avi@redhat.com, gregkh@suse.de,
	aafabbri@cisco.com, scofeldm@cisco.com
To: Tom Lyon <pugs@cisco.com>
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On Tue, Jun 08, 2010 at 02:21:52PM -0700, Tom Lyon wrote:
> +	case VFIO_DOMAIN_UNSET:
> +		vfio_domain_unset(vdev);
> +		ret = 0;
> +		break;
> +

What if I do:
SET
mmap
UNSET

Now I have access to device which is not behind an iommu.
Simplest solution is to remove the UNSET ioctl:
it's not terribly useful anyway.

-- 
MST