gpu-device-assignment.txt

==================================GPU Device Assignment==================================                                            
1.add intel_iommu=on to kernel line of host, ensure host support  Nvidia GPU card

2.create xorg.conf file inside guest and BusID to this configuration
#Xorg -configure :1
add BusID "PCI:6:0:0" to xorg.conf
e.g
/etc/X11/xorg.conf.d/xorg.conf
Section "Device"
     BusID       "PCI:6:0:0"
EndSection

3. load vfio-pci module on host
#modprobe vfio-pci

4. unbind Nvidia device(e.g pci address is 06:00.0)
#echo 1 > /sys/module/vfio_iommu_type1/parameters/allow_unsafe_interrupts(if dmesg complains, otherwise no need)
#echo "10de 0ff2" > /sys/bus/pci/drivers/vfio-pci/new_id
#echo 0000:06:00.0 > /sys/bus/pci/devices/0000\:06\:00.0/driver/unbind
#echo 0000:06:00.0 > /sys/bus/pci/drivers/vfio-pci/bind

5. boot linux guest with cli
#/usr/libexec/qemu-kvm -M pc -enable-kvm -m 2048 -smp 2,sockets=2,cores=1,threads=1  -device vfio-pci,host=06:00.0,id=GPU-k1,addr=06.0

6. check GPU card from monitor
(qemu) info pci
Bus  0, device   6, function 0:
    VGA controller: PCI device 10de:0ff2
      IRQ 10.
      BAR0: 32 bit memory at 0xfa000000 [0xfaffffff].
      BAR1: 64 bit prefetchable memory at 0xd0000000 [0xd7ffffff].
      BAR3: 64 bit prefetchable memory at 0xf2000000 [0xf3ffffff].
      BAR6: 32 bit memory at 0xffffffffffffffff [0x0007fffe].
      id "GPU-k1"
...

7. check GPU card inside guest
# lspci