I believe kernel 4.2.6 is broken. Use the linux-lts kernel which I think is 
still 4.1.6.

> On Dec 15, 2015, at 3:18 PM, Roel Van Gorp <roelvang...@gmail.com> wrote:
> 
> Hi guys,
> 
> After successfully setting up a W10 VM while passing through my GTX 980ti on 
> my old Arch linux install, I now have some difficulties setting it up on a 
> new Fedora installation using the exact same hardware configuration.
> 
> I'm using a fresh Fedora 23 installation, kernel 4.2.6-301, the virt-preview 
> repo for the latest virtualization packages and the firmware repo at 
> https://www.kraxel.org/repos/firmware.repo for the latest OVFM firmware.
> 
> I mostly based myself on Alex Williamson's blog to set this up, resulting in 
> the following changes in the following files:
> 
> /etc/sysconfig/grub:
> 
>   GRUB_CMDLINE_LINUX="rd.lvm.lv=fedora/root rd.lvm.lv=fedora/swap rhgb quiet 
> intel_iommu=on rd.driver.pre=vfio-pci"
> 
> /etc/modprobe.d/local.conf 
> 
>    options vfio-pci ids=10de:17c8,10de:0fb0
>    options vfio-pci disable_vga=1
> 
> /etc/dracut.conf.d/local.conf
> 
>    add_drivers+="vfio vfio_iommu_type1 vfio_pci vfio_virqfd"
> 
> 
> This seems to have successfully enabled the vfio-pci driver, as shown by the 
> output of lspci -nnk:
> 
> 01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GM200 [GeForce 
> GTX 980 Ti] [10de:17c8] (rev a1)
>       Subsystem: Micro-Star International Co., Ltd. [MSI] Device [1462:3232]
>       Kernel driver in use: vfio-pci
>       Kernel modules: nouveau
> 01:00.1 Audio device [0403]: NVIDIA Corporation Device [10de:0fb0] (rev a1)
>       Subsystem: Micro-Star International Co., Ltd. [MSI] Device [1462:3232]
>       Kernel driver in use: vfio-pci
>       Kernel modules: snd_hda_intel
> 
> The VM:
> 
> Now I first set up the VM without PCI passthrough using virt-manager and 
> everything worked as expected using a virtual display, allowing me to fully 
> install Windows 10 Pro. The problems started when removing the virtual 
> display and adding the PCI devices for the GTX 980 ti. There is no video 
> output, and looking at the CPU monitor in virt-manager there is a short CPU 
> spike after which it seems hangs at around 1-2%. Reattaching the virtual 
> display again shows the bios splash screen normally as expected, after which 
> it goes to black with just the small white prompt dash. Removing the PCI 
> devices from the configuration again allow the VM to boot normally again. 
> Here is the xml config for the VM:
> 
> <domain type='kvm'>
>   <name>win10</name>
>   <uuid>527f731e-0d9e-460a-a1ef-7a010e191c34</uuid>
>   <memory unit='KiB'>2560000</memory>
>   <currentMemory unit='KiB'>2560000</currentMemory>
>   <vcpu placement='static'>2</vcpu>
>   <os>
>     <type arch='x86_64' machine='pc-i440fx-2.4'>hvm</type>
>     <loader readonly='yes' 
> type='pflash'>/usr/share/edk2.git/ovmf-x64/OVMF_CODE-pure-efi.fd</loader>
>     <nvram>/var/lib/libvirt/qemu/nvram/win10_VARS.fd</nvram>
>     <boot dev='hd'/>
>   </os>
>   <features>
>     <acpi/>
>     <apic/>
>     <pae/>
>     <hyperv>
>       <relaxed state='on'/>
>       <vapic state='on'/>
>       <spinlocks state='on' retries='8191'/>
>     </hyperv>
>     <vmport state='off'/>
>   </features>
>   <cpu mode='host-passthrough'>
>     <topology sockets='1' cores='2' threads='1'/>
>   </cpu>
>   <clock offset='localtime'>
>     <timer name='rtc' tickpolicy='catchup'/>
>     <timer name='pit' tickpolicy='delay'/>
>     <timer name='hpet' present='no'/>
>     <timer name='hypervclock' present='yes'/>
>   </clock>
>   <on_poweroff>destroy</on_poweroff>
>   <on_reboot>restart</on_reboot>
>   <on_crash>restart</on_crash>
>   <pm>
>     <suspend-to-mem enabled='no'/>
>     <suspend-to-disk enabled='no'/>
>   </pm>
>   <devices>
>     <emulator>/usr/bin/qemu-kvm</emulator>
>     <disk type='file' device='disk'>
>       <driver name='qemu' type='qcow2'/>
>       <source file='/var/lib/libvirt/images/win10.qcow2'/>
>       <target dev='vda' bus='virtio'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x07' 
> function='0x0'/>
>     </disk>
>     <controller type='usb' index='0' model='ich9-ehci1'>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x06' 
> function='0x7'/>
>     </controller>
>     <controller type='usb' index='0' model='ich9-uhci1'>
>       <master startport='0'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x06' 
> function='0x0' multifunction='on'/>
>     </controller>
>     <controller type='usb' index='0' model='ich9-uhci2'>
>       <master startport='2'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x06' 
> function='0x1'/>
>     </controller>
>     <controller type='usb' index='0' model='ich9-uhci3'>
>       <master startport='4'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x06' 
> function='0x2'/>
>     </controller>
>     <controller type='pci' index='0' model='pci-root'/>
>     <interface type='network'>
>       <mac address='52:54:00:21:17:b8'/>
>       <source network='default'/>
>       <model type='rtl8139'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x03' 
> function='0x0'/>
>     </interface>
>     <hostdev mode='subsystem' type='pci' managed='yes'>
>       <source>
>         <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
>       </source>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x02' 
> function='0x0'/>
>     </hostdev>
>     <hostdev mode='subsystem' type='pci' managed='yes'>
>       <source>
>         <address domain='0x0000' bus='0x01' slot='0x00' function='0x1'/>
>       </source>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x04' 
> function='0x0'/>
>     </hostdev>
>     <memballoon model='virtio'>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x08' 
> function='0x0'/>
>     </memballoon>
>   </devices>
> </domain>
> 
> 
> Any help would be greatly appreciated!
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