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From: Alex Williamson <alex.williamson@redhat.com>
Date: Wed, 28 Nov 2012 10:00:34 -0700
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Subject: Re: [Qemu-devel] PCI device pass through support
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To: Krishna J <krishnamurthyjs@outlook.com>
Cc: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, "kvm@vger.kernel.org" <kvm@vger.kernel.org>

On Wed, 2012-11-28 at 16:32 +0000, Krishna J wrote:
> Hi Alex,
> I am trying to pass through a PCI device to the guest to compare the
> MSI interrupt latency with normal device pass through and pass through
> using VFIO framework. I used the following script
> 
> for dev in $(ls /sys/bus/pci/devices/0000:06:00.0/iommu_group/devices); do
>     vendor=$(cat /sys/bus/pci/devices/$dev/vendor)
>     device=$(cat /sys/bus/pci/devices/$dev/device)
>     if [ -e /sys/bus/pci/devices/$dev/driver ]; then
>         echo $dev > /sys/bus/pci/devices/$dev/driver/unbind
>     fi
>     echo $vendor $device > /sys/bus/pci/drivers/vfio-pci/new_id
> done
> 
> and added "-device vfio-pci,host,host=0000:06:00.0" to my qemu command line. 
                             ^^^^^

> I am getting Error - qemu-system-x86_64: -device
> vfio-pci,host,host=0000:06:00.0: Property 'vfio-pci.host' doesn't take
> value 'on'-- when i use the qemu for your git repo and and also the
> latest v1.3.0-rc1 qemu. I am using Kernel 3.6.7-rt18. Am i missing
> step ?

Hi Krishna,

There's an extra "host," in the option above, is that the problem?
Please let me know if I've mis-documented it anywhere.  I hope you can
share your results when you get it working.  Thanks,

Alex