修改/etc/default/grub，找到GRUB_CMDLINE_LINUX_DEFAULT，按CPU类型分别修改为
GRUB_CMDLINE_LINUX_DEFAULT="quiet intel_iommu=on iommu=pt"
GRUB_CMDLINE_LINUX_DEFAULT="quiet amd_iommu=on iommu=pt"应用更改：update-grub，然后重启系统。
虚拟机选择q35最新版本，添加显卡对应pci设备，勾选如图，Nvidia显卡勾选主GPU的话很可能造成显卡驱动报43错误。
安装完显卡驱动之后可将虚拟机显示设备设置为none,至此完成显卡直通。
以前繁琐的添加各种参数修改不再需要，此方法在pve 7.3-4版本下直通750ti成功。
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