I've seen exactly that issue, but I'm still not 100% sure what caused it.
I'm inclined to believe it was my USB controller card that I was using in
addition to my GPU, as when I swapped that out for a different one with a
better chipset, the problem stopped entirely.

On Fri, Oct 14, 2016 at 1:07 PM, Hugo Leblanc <dul...@gmail.com> wrote:

> I’m having problems with my Windows 10 Guest on a vfio GPU passthrough.
> The systems sometimes can’t seem to get past the windows bootloader (not
> sure if that’s exactly where it stalls). When the VM stalls, I only get to
> see the Windows logo bootscreen and I never get to see the spinning dots
> under it.
> After a couple of bad boots, the VM sees and tries to get into the
> diagnostic repair and we have the same situation. Either it stalls or we
> see the spinning dots and everything is fine (I can just do the normal
> startup from there to go to my desktop).
> Also, when it stalls, I can see it hogs my first cpu core at 100% and
> doesn’t touch the other cores.
> Otherwise, the guest runs perfectly, no other problems seem to arise once
> we’re past the boot.
> Has anybody seen this kind of behaviour before?
> I checked the dmesg logs and see nothing out of the ordinary when it
> stalls. Is there any way to have an easier time seeing what could be at
> fault here?
> I’m using Arch as the host using this guide ( https://wiki.archlinux.org/
> index.php/PCI_passthrough_via_OVMF ) with a Nvidia GTX980 on a AsRock
> Extreme 6 Z97 motherboard.
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