[vfio-users] 750 Ti passthrough works for Linux not Windows?

[Will Marler]

You need more than kvm hidden. From Alex's blog post (emphasis mine):
http://vfio.blogspot.com/2015/05/vfio-gpu-how-to-series-part-4-our-first.html

"The GeForce card is nearly as easy, but we first need to work around some
of the roadblocks Nvidia has put in place to prevent you from using the
hardware you've purchased in the way that you desire (and by my reading
conforms to the EULA for their software, but IANAL).  For this step we
again need to run virsh edit on the VM.  *Within the <features> section,
remove everything between the <hyperv> tags, including the tags themselves.*
 In their place add the following tags:

    <kvm>
      <hidden state='on'/>
    </kvm>

*Additionally, within the <clock> tag, find the timer named hypervclock,
remove the line containing this tag completely*.  Save and exit the edit
session."

I can't speak to Ubuntu (I'm running Arch on my host), but I have the same
graphics cards as you (Intel integrated graphics for host, 750Ti for guest)
and can confirm it works.

On Wed, Jan 6, 2016 at 10:31 PM, Simon Ye <sye737 at gmail.com> wrote:

> My current system is Ubuntu 15.10, virt-manager 1.3.1, kernel 4.2.0. IGP
> for host and 750 Ti for guest. I'm using the i440FX and UEFI tianocore
> OVMF.
>
> The pci passthrough works for a linux guest (Arch) but Windows 10 has no
> signal detected. I do have the kvm hidden state flag set.
>
> Is there any reason why pci passthrough would specifically fail on windows?
>
>
>
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