On Thu, Jun 9, 2016 at 3:59 AM, <lu...@herich.net> wrote: > Hello everyone, > > I am running a fresh Ubuntu 16.04 and want to use kvm/qemu to run a > windows VM with a gpu passthrough, however after patching the kernel both > gpus are still within the same iommu group 1. > My system: > - Intel Core i7 6700 > - Gigabyte GA-Z170X-UD5 TH Intel Z170 > - 1x GeForce GTX 650 Ti (used by the host) > - 1x GeForce GTX 960 (used by the vm) > > I am not so well versed with linux, so I read lots of tutorials and > howtos. However I am kind of stuck right now and do not even know how to > verify if I used the correct patches (Alex commented within the first > patch: "This doesn't fix what lspci shows."). > Hopefully someone could give me an advice how to proceed from here or if I > should give up. > > That is what I have done: > * install Ubuntu 16.04 (kernel version 4.4.0) > * install kvm, quemu and so on > * let vfio-pci grab the GTX 960 (see [1] and [2]) > * install nvidia driver for the GTX 650 Ti > * build patched kernel (see [3]) > * start virtual machine manager > * create a vm with windows 7 > * adding passthrough gpu from slot 2 results in (details see [4]): vfio: > error, group 1 is not viable, please ensure all devices within the > iommu_group are bound to their vfio bus driver >
You're overlooking an important qualifier of the patches you're using, they only enable isolation of devices downstream of *PCH* root ports. I don't see a block diagram of the layout in your motherboard manual, but this is only going to affect the root ports at address 00:1c.*. As always on Intel, you need to use a High End Desktop Processor or Xeon E5 or better CPU to get isolation of the processor root ports (or use the ACS override patch that I don't support). Thanks, Alex
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