Re: Problems using vfio pcie passthrough (pci-assign works)

[Bruce Cran <bruce@cran.org.uk>]

On 10/2/2014 8:25 AM, Alex Williamson wrote:
> What's the device you're trying to assign and the scripts you're using
> to do so?  vfio-pci is fully supported, but I'd recommend a kernel newer
> than 3.11 (maybe a newer QEMU too, you didn't specify a version) unless
> openSUSE is specifically pulling vfio features and fixes into their
> distro.  vfio does work with OVMF, most of the testing of this is with
> GPU assignment.  It does require an OVMF image built from a fairly
> recent tree (not more than a few months old), but if you're getting into
> the guest OS you're probably fine.  Provide more details and I can try
> to help.

Thanks, the device is a mass storage device that I work on; it's in 
iommu group 1 so the script I'm running is:

for i in $(ls /sys/kernel/iommu_groups/1/devices/); do
   echo $i | sudo tee \
   /sys/kernel/iommu_groups/1/devices/$i/driver/unbind
   VEN=$(cat /sys/kernel/iommu_groups/1/devices/$i/vendor)
   DEV=$(cat /sys/kernel/iommu_groups/1/devices/$i/device)
   echo $VEN $DEV | sudo tee \
   /sys/bus/pci/drivers/vfio-pci/new_id
done

I started out trying to use the version of qemu that openSUSE provides 
which is 1.6.2 but I also built 2.1.2 from source and that didn't help.  
In terms of OVMF, I've tried an OVMF-pure-efi.fd binary from 
https://www.kraxel.org/repos/jenkins/edk2/ as well as building a debug 
OVMF.fd binary from the edk2 project 
(https://github.com/tianocore/edk2/commit/23a2df76783ad7694918916f28e24cd1a1f84daf).

If you think it might help, I can certainly install a newer kernel.

-- 
Bruce