[vfio-users] Windows 10 guest refuses to boot when passed my NVIDIA graphics card

[Alex Williamson]

On Tue, Sep 15, 2015 at 5:14 PM, Jasen Borisov <tajjada at gmail.com> wrote:

> I just downgraded to Linux 4.1 on the host ... and the problem went away!
> The virtual machine now runs with proper performance. I even booted into a
> full XFCE desktop with nvidia proprietary drivers and played some opengl
> demos. Then I tried Windows 10, and that worked fine too ... so, in brief,
> all the issues were resolved.
>
>
> This seems like a very serious regression to me. Kernel 4.2 is officially
> released and shouldn't be having issues like this. Are the relevant kernel
> people who are responsible for the relevant subsystems aware of this?
> Should I make an effort to report this?
>

I'm aware now, but I don't know what the problem is yet, my GPU VM runs
just fine on v4.2.  What does the following report on the host:

# cat /sys/class/iommu/dmar?/intel-iommu/*cap
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/vfio-users/attachments/20150915/54f42b36/attachment.htm>