cat /proc/cmdline | grep iommu

cd /etc/default       #進入啟動選項主目錄
cp grub grub.bak    #復制
vi grub

GRUB_CMDLINE_LINUX="intel_iommu=on pci-stub.ids=10de:xxx pci-stub.ids=10de:xxx" #忽略需要直通的顯卡總線的ID，并且啟動intel的內存管理單元

grub2-mkconfig -o /boot/grub/grub.cfg

grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg # uefi啟動用這個，不然無法啟動iommu

cat /proc/cmdline | grep iommu #內核是否支持iommu

輸出結果：inter_iommu=on

dmesg |grep -e DMAR -e IOMMU # 驗證VT-D是否啟用

modprobe vfio
modprobe vfio-pci

lspci -nn | grep NVIDIA

3b:00.0 VGA compatible controller [0300]: NVIDIA Corporation Device [10de:2204] (rev a1)
3b:00.1 Audio device [0403]: NVIDIA Corporation Device [10de:1aef] (rev a1)

find /sys/kernel/iommu_groups/ -type l #查出來之后將同一組的設備全部分離出去
virsh nodedev-detach pci_0000_3b_00_0  #通過上面的命令查出主線id
virsh nodedev-detach pci_0000_3b_00_1

lspci -vv -s 3b:00.0 | grep driver
#根據找到的驅動依次卸載
echo -n "0000:3b:00.1" > /sys/bus/pci/drivers/snd_hda_intel/unbind # 還有聲卡，他們是一組，我這里就偷懶了，方法一樣，只不過總線id不同

echo -n "10de 0fb9" > /sys/bus/pci/drivers/vfio-pci/new_id   # 還有聲卡，他們是一組，我這里就偷懶了，方法一樣，只不過總線id不同

lspci -vv -s 3b:00.0 | grep driver     # 還有聲卡，他們是一組，我這里就偷懶了，方法一樣，只不過總線id不同

 #結果：   Kernel driver in use: vfio-pci

#在宿主機上編輯虛機的xml配置文件
virsh edit xxxx
#在設備標簽中添加如下內容：
<hostdev mode='subsystem' type='pci' managed='yes'>
       <source>
　　　　　#  bus slot function 分別為：0000:3b:0.0 中的后三部分
        <address domain='0x0000' bus='0x3b' slot='0x00' function='0x0'/>
      </source>
</hostdev>

yum install kernel-devel gcc -y

lsmod | grep nouveau #檢查系統自帶的驅動模塊

vi /lib/modprobe.d/dist-blacklist.conf #修改dist-blacklist.conf文件：

# 將nvidiafb注釋掉，注意#和后面內容中間有空格
# blacklist nvidiafb 

# 然后添加以下語句：
blacklist nouveau
options nouveau modeset=0

  # 重建initramfs image步驟

  mv /boot/initramfs-$(uname -r).img /boot/initramfs-$(uname -r).img.bak

  dracut /boot/initramfs-$(uname -r).img $(uname -r)

reboot # 重啟電腦

lsmod | grep nouveau

chmod +x NVIDIA-Linux-x86_64-525.105.17.run

 ./NVIDIA-Linux-x86_64-525.105.17.run

 ./NVIDIA-Linux-x86_64-525.105.17.run
Verifying archive integrity... OK
Uncompressing NVIDIA Accelerated Graphics Driver for Linux-x86_64 525.105.17...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

nvidia-smi