[Qemu-devel] PCI device pass through support

[Krishna J]

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 ?


Krishna