[Unraid 6.8.0 - 1660 GTX GPU Passthrough]

Hello, i wasted a lot of time to solve problem on plain KVM (not unraid) to use in Win10 guest, may it helps to you.
1) Nvidia GPU 1000+ is protected to use for passthrought, i have flashed bios on my GTX 1050Ti to use in KVM, but may it is not nessesary

2) My CPU AMD Ryzen and kernel parameters a little different:

GRUB_CMDLINE_LINUX_DEFAULT="splash=silent quiet elevator=deadline amd_iommu=force_isolation iommu=pt rd.driver.pre=vfio-pci vt.global_cursor_default=0 pcie_acs_override=downstream,multifunction"
 
3) This is part of my config for KVM. That worked for me:

...

<features>
   <acpi/>
   <apic/>
   <hyperv>
     <relaxed state='on'/>
     <vapic state='on'/>
     <spinlocks state='on' retries='8191'/>
     <vpindex state='on'/>
     <synic state='on'/>
     <stimer state='on'/>
     <vendor_id state='on' value='ahb6Wah2geeb'/>
     <frequencies state='on'/>
   </hyperv>
   <kvm>
     <hidden state='on'/>
   </kvm>
   <vmport state='off'/>
   <ioapic driver='kvm'/>
 </features>
 <cpu mode='host-passthrough' check='partial'>
   <topology sockets='1' cores='6' threads='2'/>
   <cache mode='passthrough'/>
   <feature policy='require' name='topoext'/>
   <feature policy='disable' name='hypervisor'/>
 </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>
...

   <hostdev mode='subsystem' type='pci' managed='yes'>
     <source>
       <address domain='0x0000' bus='0x09' slot='0x00' function='0x0'/>
     </source>
     <rom file='/opt/windows/nvidia-patched.rom'/>
     <address type='pci' domain='0x0000' bus='0x00' slot='0x0a' function='0x0'/>
   </hostdev>
 

4) I have used
nvflash_linux
nvidia_vbios_vfio_patcher.py
to patch and flash my GPU