KVM VFIO

1. Download source

1.1 Download linux-vfio kernel source

$ git clone git://github.com/awilliam/linux-vfio.git

1.2. Download qemu-vfio

$ git clone git://github.com/awilliam/qemu-vfio.git iommu-group-vfio

2. Compile and install

2.1 Compile qemu

$ ./configure --prefix=/usr
$ make
$ sudo make install

2.2 Compile kernel

# make menuconfig

IMPORTANT: Mark VFIO related options as , which means make them removable modules, not builtin modules. (Because you might need to reload them in the future.)

# make
# make modules_install install

3. Run kvm 

Start kvm with usual command plus :

# kvm ... -device vfio-pci,host=01:00.0,id=hostdev0

Error:
Failed to set iommu for container: Operation not permitted Failed to setup container for group 1

Solution[1]:
Check dmesg, it's probably complaining about no interrupt remapping support. If so:

# modprobe -r vfio_iommu_type1
# modprobe vfio_iommu_type1 allow_unsafe_interrupts=1

[1] http://www.mail-archive.com/kvm@vger.kernel.org/msg73068.html